We provide thermal properties of matter practice exercises, instructions, and a learning material that allows learners to study outside of the classroom. We focus on thermal properties of matter skills mastery so, below you will get all questions that are also asking in the competition exam beside that classroom.

#### List of thermal properties of matter Questions

Question No | Questions | Class |
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1 | When water is heated from ( 0^{circ} mathrm{C} ), its volume will A. decrease till ( 4^{circ} mathrm{C} ) then increase B. decrease till ( 4^{circ} mathrm{C} ) c. remain the same D. first increase then decrease | 11 |

2 | Two sample of Hydrogen and Oxygen of same mass possess same pressure and volume. The ratio of their temperature is A . 1: 8 B. 1: 16 c. 8: 1 D. 16: 1 | 11 |

3 | We have seen that a gamma-ray does of 3Gy is lethal to half the people exposed to it. If the equivalent energy were absorbed as heat, what rise in body temperature would result? A. 600 B. 500 c. 700 D. 900 | 11 |

4 | lce is used in a cooler in order to cool its contents.Which of the following will speed up the cooling process A. Wrap the ice in a metal foil B. Drain the water from the cooler periodically c. Put the ice as a single block D. Crush the ice | 11 |

5 | A ( 10 W ) electric heater is used to heat a container filled with ( 0.5 mathrm{kg} ) of water. It is found that the temperature of water and the container rises by ( 3 K ) in 15 min. The container is then emptied, dried and filled with ( 2 k g ) of oil. The same heater now raises the temperature of container-oil system by ( 2 K ) in 20 min. Assuming that there is no heat loss in the process and the specific heat of water is ( 4200 mathrm{Jkg}^{-1} mathrm{K}^{-1} ), the specific heat of oil in the same unit is equal to: A. ( 1.50 times 10^{3} ) В. ( 2.55 times 10^{3} ) c. ( 3.00 times 10^{3} ) D. ( 5.10 times 10^{3} ) | 11 |

6 | If a gas has n degrees of freedom ratio of specific heats of gas is? A ( cdot frac{1+n}{2} ) в. ( _{1+frac{1}{n}} ) ( c cdot 1+frac{n}{2} ) D. ( _{1+frac{2}{n}} ) | 11 |

7 | Give reason: An iron chair feels colder than a wooden chair in winter | 11 |

8 | A reciever has a pressure of ( 144 mathrm{cm} ) of ( mathrm{Hg} ) After two strokes with an exhaust pump, the pressure is ( 36 mathrm{cm} ) of Hg. After another two strokes the pressure will be. ( mathbf{A} cdot ) 9cm of ( mathrm{Hg} ) B. ( 2.4 mathrm{cm} ) of ( mathrm{Hg} ) ( mathbf{C} . ) 6cm of ( mathrm{Hg} ) D. ( 3 mathrm{cm} ) of ( mathrm{Hg} ) | 11 |

9 | The rate of evaporation of a given liquid depends only on the surface area of the liquid exposed to air. A. True B. False | 11 |

10 | A 2 meter long aluminum pipe at ( 27^{circ} mathrm{C} ) is heated until it is 2.0024 at ( 77^{circ} ) C. The coefficient of linear expansion of aluminum is : A . ( 12 times 10^{-6} /^{circ} mathrm{C} ) B . ( 24 times 10^{-6} /^{circ} mathrm{C} ) c. ( 6 times 10^{-6} /^{circ} mathrm{C} ) D ( .20 times 10^{-2} ) | 11 |

11 | Coefficient of linear expansion of a crystal in 3 mutually perpendicular directions are ( 8.5 times 10^{-6} /^{o} C, 10.5 times ) ( 10^{-6} /^{o} C, 11 times 10^{-6} /^{o} C . ) If mass of crystal is ( 25 g m, ) its volume at ( 60^{circ} C ) is (given density at ( 0^{circ} C ) is 5 gm ( / c c ) ): A. 5.009 cc B. 4.991 cc c. ( 5.9 mathrm{cc} ) D. 5.999 cc | 11 |

12 | A hot liquid contained in a container of negligible heat capacity loses temperature at rate ( 3 K / )min just before it begins to solidify. The temperature remains constant for 30 min. If the ratio of specific heat capacity of liquid to specific latent heat of fusion is ( frac{x}{90} K^{-1} . ) Find ( x ). (given that rate of losing heat is constant). | 11 |

13 | The solar constant for the earth is ( S ). The surface temperature of the sun is ( boldsymbol{T} boldsymbol{K} ) The sun subtends an angle ( theta ) at the earth. This question has multiple correct options ( A cdot S propto T^{4} ) в. ( S propto T^{2} ) c. ( S propto theta^{2} ) ( mathbf{D} cdot S propto theta ) | 11 |

14 | A liquid takes 5 minutes to cool from 80 ( ^{o} mathrm{C} ) to ( 50^{circ} mathrm{C} ). How much time will it take to cool from ( 60^{circ} mathrm{C} ) to ( 30^{circ} mathrm{C} ? ) (Temperature of the surrounding ( left.=20^{circ} mathrm{C}right) ) A. 10 minutes B. 15 minutes c. 5 minutes D. 7.5 minutes | 11 |

15 | When a metal sphere is heated maximum percentage increase occurs in its : A. Density B. Surface area c. Radius D. volume | 11 |

16 | In the melting of ice at ( 0^{circ} mathrm{C} ), which are favorable conditions? A. High T & High P B. Low T & High P c. Low T & Low P D. High T & Low P | 11 |

17 | Assertion Warming a room by a heat blower is an example of forced convection. Reason Natural convection takes place due to gravity A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 11 |

18 | The ratio of thermal capacities of two aluminium spheres of radii ( 8 mathrm{cm} ) and 16 ( mathrm{cm} ) is ( A cdot 4: 1 ) B. 1: 4 c. 1: 8 D. 8: 1 | 11 |

19 | Calculate the normal temperature of human body in celsius scale if it is ( mathbf{9 8 . 4}^{circ} boldsymbol{F} ) in Fahrenheit scale | 11 |

20 | 50 g of copper is heated to increase its temperature by ( 10^{circ} mathrm{C} ). If the same quantity of heat is given to 10 g of water, the rise in temperature is (specificheat of copper ( = ) ( 420 J k g^{-1} K^{-1}, ) specificheat of water ( left.4200 J k g^{-1} K^{-1}right) ) ( mathbf{A} cdot 5^{circ} C ) B . ( 6^{circ} mathrm{C} ) ( mathrm{c} cdot 7^{circ} mathrm{C} ) D. ( 8^{circ} mathrm{C} ) | 11 |

21 | The water equivalent of a body, whose mass is ‘m’ g and specific heat is ‘s’ ( operatorname{cal} g^{-1} C^{-1} ) is given by | 11 |

22 | How much energy in watt-hour is required for an electric heater to convert ( 2 mathrm{kg} ) of ice at ( 0^{circ} mathrm{C} ) to water ( 25^{circ} mathrm{C} ) Assume the water equivalent of the given heater to be 10 g. (Assume that initially the heater and the ice are in thermal equilibrium). | 11 |

23 | The area of cross-sections of three metals roads of equal length and made of same materials are ( A_{1}, A_{2} ) and ( A_{3} ) respectively. when heated through the same change in temperature their linear expansions are found to be ( boldsymbol{I}_{1}, boldsymbol{I}_{2} ) and ( I_{3} ) respectively which among the following is the correct relation between ( boldsymbol{I}_{1}, boldsymbol{I}_{2} ) and ( boldsymbol{I}_{3} ? ) ( mathbf{A} cdot I_{1}=I_{2}=I_{3} ) ( mathbf{B} cdot I_{1}>I_{2}>I_{3} ) ( mathbf{c} cdot I_{1}<I_{2}<I_{3} ) ( mathbf{D} cdot I_{1}=I_{2}<I_{3} ) | 11 |

24 | The two parts of a bimetallic strip are supposed to expand equally on heating. State whether true or false. A. True B. False | 11 |

25 | Which of the substances ( A, B ) or ( C ) has the highest specific heat? The temperature vs time graph is shown 4 B ( c ) A have eaual specific | 11 |

26 | A substance with more specific heat can absorb a greater amount of heat for a given mass. State whether given statement is True/False A. True B. False | 11 |

27 | If A vessel of thermal capacity 30 calories contains ( 170 g ) of water at ( 30^{circ} mathrm{C} . ) If on dropping a solid at ( 93^{circ} mathrm{C} ) into the calorimeter, then temperature of mixture becomes ( 33^{circ} mathrm{C} ), find the thermal capacity of solid. | 11 |

28 | Two spheres of the same metal have radii ( 1 mathrm{m} ) and ( 4 mathrm{m} ) and temperature ( 4000 K ) and ( 2000 K ) respectively. The ratio of the energy radiated per second by the first to the second is : A . 1: B. 1: c. 2: D. 1: | 11 |

29 | At what temperature in degree Kelvin the Fahrenheit and Kelvin scales of temperature give the same reading? | 11 |

30 | Equal masses of ( N_{2} ) and ( O_{2} ) gases are filled in vessel A and B. The volume of vessel B is double of A. The ratio of pressure in vessel ( A ) and ( B ) will be A . 16: 7 B. 16:14 c. 32: 7 D. 32:28 | 11 |

31 | ( 4.00 mathrm{cm} ) contains air compressed by a piston of mass ( m=13.0 mathrm{kg} ) which can slide freely in the cylinder. The entire arrangement is immersed in a water bath whose temperature can be controlled. The system is initially in equilibrium at temperature ( t=20^{circ} C ) The initial height of the piston above the bottom of the cylinder is ( h_{i}=4.00 mathrm{cm} ) The temperature of the water bath is gradually increased to a final temperature ( t_{f}=100^{circ} mathrm{C} . ) Calculate the final height ( h_{f} ) of the piston. ( mathbf{A} cdot 25.09 mathrm{cm} ) B. ( 5.09 mathrm{cm} ) c. ( 15.09 c m ) D. ( 10.09 mathrm{cm} ) | 11 |

32 | Heat exchangers work in the principle of A. Convection B. conduction c. mixed convection D. Both A and E | 11 |

33 | A body cools from ( 50^{circ} mathrm{C} ) to ( 40^{circ} mathrm{C} ) in 5 minutes. The surrounding temperature is ( 20^{circ} mathrm{C} . ) By how many ( ^{circ} mathrm{C} ) does the temperature decrease in the next 5 minutes? Round your answer to the nearest integer. | 11 |

34 | The ingredients from a mixture of iodine and sand can be separated by: A. Filteration B. Sublimation c. crystallisation D. Precipitation | 11 |

35 | Seema is planning a trip to Kashmir this summer. Which of the following clothes should she definitely pack? A. Denim Jacket B. Leather pants c. Woolen sweater D. cotton shirt | 11 |

36 | When a rod is heated from ( 25^{circ} mathrm{C} ) to ( mathbf{7 5}^{circ} boldsymbol{C}, ) it expands by ( mathbf{1} boldsymbol{m} boldsymbol{m} . ) When a rod of same material but with 4 times the length is heated from ( 25^{circ} C ) to ( 50^{circ} C ) The increase in length is : ( mathbf{A} cdot 1 m m ) в. ( 1.5 mathrm{mm} ) ( mathrm{c} .1 .6 mathrm{mm} ) D. ( 2 m m ) | 11 |

37 | Mass of water at ( 10^{circ} mathrm{C} ) increases when heated to ( 30^{circ} mathrm{C} ). True or false. A. True B. False | 11 |

38 | Heat is A. kinetic energy of molecules B. potential and kinetic energy of molecules C. Energy in transit D. work done on the system | 11 |

39 | The unit of specific heat is A . cal B . Cal/g/’c c. cal/g D. none of these | 11 |

40 | In thermal equilibrium concepts, heat lost by hot body is equal to A. Heat gained by hot body B. Heatgained by cold body c. Both (a) and (b) D. None of these | 11 |

41 | The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by : A. Rayleigh Jeans law B. Planck’s law of radiation c. stefan’s law of radiation D. Wien’s law | 11 |

42 | One litre of helium under a pressure of 2 atm and at ( 27^{circ} mathrm{cis} ) heated until its pressure and volume are doubled. The final temperature attained by the gas is ( A cdot 927 K ) B . ( 927^{circ} mathrm{C} ) ( c cdot 1200^{0} c ) D. None | 11 |

43 | Sublimation is a technique that helps chemists to: A. break B. purify c. melt D. freeze | 11 |

44 | Convection cannot take place in A. solids B. liquids c. gases D. None of the above | 11 |

45 | Two gases A&B having same pressure ( P ) volume ( V ) and absolute temperature T are mixed. If the mixture has volume and temperature as ( vee & ) T respectively then the pressure of mixture is ( A cdot 2 P ) B. ( c cdot P / 2 ) D. ( 4 P ) | 11 |

46 | Two containers of equal volume containing the same gas at pressure ( P_{1} ) and ( P_{2} ) and absolute temperature ( T_{1} ) and ( T_{2} ) respectively were connected with narrow capillary tube. The gas reaches a common pressure ( mathrm{P} ) and a common temperature T. The ratio P/T is equal to : A ( cdot frac{P_{1}}{T_{1}}+frac{P_{2}}{T_{2}} ) B ( cdot frac{1}{2}left(frac{P_{1}}{T_{1}}+frac{P_{2}}{T_{2}}right) ) c. ( frac{P_{1} T_{2}+P_{2} T_{1}}{T_{1}+T_{2}} ) D. ( frac{P_{1} T_{2}-P_{2} T_{1}}{T_{1}-T_{2}} ) | 11 |

47 | ( 5 mathrm{kg} ) of water at ( 80^{circ} mathrm{C} ) is taken in a bucket of negligible heat capacity, ( 15 mathrm{kg} ) of water at ( 20^{circ} C ) is added to it. What is the temperature of the mixture? ( mathbf{A} cdot 45^{circ} C ) в. ( 65^{circ} ) С ( mathbf{c} cdot 85^{circ} C ) D. ( 35^{circ} mathrm{C} ) | 11 |

48 | ( boldsymbol{C H}_{4}(boldsymbol{g})+mathbf{2} boldsymbol{O}_{2}(boldsymbol{g}) rightarrow boldsymbol{C} boldsymbol{O}_{2}(boldsymbol{g})+ ) ( 2 H_{2} O(g)+800 k J . ) If a mole of ( O_{2}(g) ) is consumed in the reaction, what energy is produced? A ( .200 k J ) ( J ) в. ( 400 k J ) c. ( 800 k J ) D. 1200 k ( J ) E. ( 1600 k J ) | 11 |

49 | The heat needed to turn 1 kg of solid into liquid at its melting point is known as A . Latent heat B. Specific latent heat of vaporisation c. specific latent heat of fusion D. specific latent heat of substance | 11 |

50 | Thermal conductivity of standard SWNT along its length is Watt/m.K. A . 3500 B. 35,000 c. 350 D. 3600 | 11 |

51 | The ratio of amplitudes of radiation emitted by a cylindrical source at distances ( 2 r ) and ( 18 r ) from its axis will be A . 1: 3 B. 2: c. 1: D. 9: 1 | 11 |

52 | The method for separation of mixture of common salt and ammonium chloride is: A. Fractional distillation B. Sublimation c. chromatography D. crystallization | 11 |

53 | A copper ball of mass 100 gm is at a temperature ( T . ) It is dropped in a copper calorimeter of mass ( 100 g m ), filled with ( 170 g m ) of water at room temperature. Subsequently, the temperature of the system is found to be ( 75^{circ} mathrm{C} . boldsymbol{T} ) is given by : (Given : room temperature ( =mathbf{3 0}^{circ} boldsymbol{C} ) specific heat of copper ( =0.1 mathrm{cal} / mathrm{gm}^{circ} mathrm{C} ) ( mathbf{A} cdot 825^{circ} C ) B. ( 800^{circ} mathrm{C} ) ( mathbf{c} cdot 885^{circ} C ) D. ( 1250^{circ} mathrm{C} ) | 11 |

54 | ( 10 g ) of lce at ( -20^{0} C ) is added to ( 10 g ) of water at ( 50^{0} C . ) The amount of ice and water, present at equilibrium, are respectively A . ( 0,20 g ) в. ( 5 g, 15 g ) c. ( 5 g, 10 g ) D. ( 10 g, 10 g ) | 11 |

55 | Ocean thermal energy is due to A. temperature difference at different levels in the ocean B. tides in the ocean C . energy stored by the water waves D. pressure different at different levels in the ocean | 11 |

56 | Bad conductor of heat is A. copper B. Steel c. Silver D. none of these | 11 |

57 | If the time taken. by a hot body to cool from ( 50^{circ} mathrm{C} ) to ( 40^{circ} mathrm{C} ) is 10 min when the surrounding temperature is ( 25^{circ} mathrm{C} ), then the time taken for it to cool from ( 40^{circ} mathrm{C} ) to ( 30^{circ} C ) when the surrounding temperature is ( 15^{circ} mathrm{C} ), is A. 40 min B. 10 min c. ( 4 min ) D. 15 min E. 20 min | 11 |

58 | State true or false: The more is the temperature difference of hot and cold body more slowly the heat flows from it into the cold body A. True B. False | 11 |

59 | Fill in the blanks. is the fastest mode of transfer of heat. | 11 |

60 | 10 grams of steam at ( 100^{circ} mathrm{C} ) is mixed with ( 50 g m ) of ice at ( 0^{circ} C ) then final temperature is A ( cdot 20^{circ} mathrm{C} ) В. ( 50^{circ} mathrm{C} ) c. ( 40^{circ} mathrm{C} ) D. ( 100^{circ} mathrm{C} ) | 11 |

61 | If the pressure acting on an ideal gas that is kept at constant temperature is multiplied by four, its volume A . triples B. reduces to ( 1 / 3 ) c. increased by four D. reduces to ( 1 / 4 ) E. there is not enough information to tel | 11 |

62 | Convert ( 25^{0} C ) to Kelvin scale: A. ( 98.15 K ) B . ( 198.15 K ) c. ( 298.15 K ) D. ( 398.15 K ) | 11 |

63 | The temperature of a substance increases by ( 27^{circ} mathrm{C} ). On the Kelvin scale this increase is equal to ( mathbf{A} cdot 300 K ) в. ( 2.46 K ) c. ( 27 K ) D. ( 7 K ) | 11 |

64 | A gas at ( 27^{circ} mathrm{C} ) and pressure of ( 30 mathrm{atm} ) is allowed to expand to atmospheric pressure and volume 15 times larger. The final temperature of gas is ( A cdot 123^{0} C ) B . – ( 123^{circ} mathrm{C} ) c. ( 400 mathrm{k} ) D. None | 11 |

65 | At constant pressure and at a temperature of ( 27^{0} mathrm{C}, ) if the volume of a given amount of gas is to be raised three times, the temperature to which the gas should be heated is A ( cdot 27^{0} mathrm{c} ) B. ( 625^{circ} ) С c. ( 627^{circ} ) С D. ( 273^{0} mathrm{C} ) | 11 |

66 | The temperature of the sun, if pressure is ( 1.4 times 10^{9} ) atm, density is ( 1.4 g c m^{-3} ) and average molecular weight is ( 2, ) will be ( left[text {Given } boldsymbol{R}=mathbf{8 . 4} boldsymbol{J} boldsymbol{m o l}^{-1} boldsymbol{K}^{-1}right] ) A . ( 1.2 times 10^{7} K ) В. ( 2.4 times 10^{7} K ) c. ( 0.4 times 10^{7} K ) D. ( 0.2 times 10^{7} K ) | 11 |

67 | Coefficient of thermal conductivity: A. depends upon nature of the material of the body B. is independent of dimensions of the body c. both 1 and 2 D. only 1 | 11 |

68 | The ratio of masses of two metal spheres ( A ) and ( B ) is ( 8: 1 . ) If the temperatures are ( 2000 K ) and ( 1000 K ) respectively, then the ratio of the rates of their energy emission will be A . 4: B. 16: c. 64: D. 128: | 11 |

69 | 10 g of ice at ( 0^{circ} mathrm{C} ) absorbs ( 5460 mathrm{J} ) of heat energy to melt and change to water at ( 50^{circ} mathrm{C} . ) Calculate the specific latent heat of fusion of ice. Specific heat capacity of water is ( 4200 mathrm{J} mathrm{kg}^{-1} mathrm{K}^{-1} ) A ( cdot 136 ) J ( g^{-1} ) В. 236 J ( g^{-1} ) c. 336 J ( g^{-1} ) D. 436 J ( g^{-1} ) | 11 |

70 | How is the transference of heat energy by radiation prevented in a calorimeter? | 11 |

71 | Alka was making tea in a kettle. Suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle. She wondered whether the temperature of the steam was higher than that of the water boiling in the kettle. Comment. | 11 |

72 | Three rods of material ( X ) and three rods of material ( Y ) are connected as shown in figure. All the rods are identical in length and cross-sectional area. If the end ( A ) is maintained at ( 60^{circ} mathrm{C} ) and the junction ( E ) at ( 10^{circ} mathrm{C} ), calculate the temperatures of the junctions ( B, C, D ) The thermal conductivity of ( X ) is 0.92 ( C G S ) units and that of ( Y ) is ( 0.46 C G S ) units. | 11 |

73 | Two metal strips that constitute a bimetallic strip must necessarily differ in their: A. length B. mass c. coefficient of linear expansion D. resistivity | 11 |

74 | Heat capacity of a substance is infinite. It means: A. heat is given out B. heat is taken in c. no change in temperature whether heat is taken in or given out D. all of the above | 11 |

75 | It takes 10 minutes to cool a liquid from ( 61^{circ} mathrm{C} ) to ( 59^{circ} . ) If room temperature is ( 30^{circ} C ) then time taken in cooling from ( 51^{circ} C ) to ( 49^{circ} C ) is A . 10 min B. 11 min c. 13 min D. 15 min | 11 |

76 | A metal cylinder 0.628 m long and ( 0.04 m ) in diameter has one end in boiling water at ( 100^{circ} mathrm{C} ) and other end is melting ice. The co-efficient of Thermal conductivity of the metal is ( 378 W m^{-1} k^{-1} . ) Latest heat of lce is ( 3.36 times 10^{5} J k g^{-1} . ) Find the mass of ice melts in one hour. | 11 |

77 | at a constant temperature of ( boldsymbol{theta}_{boldsymbol{o}} ) Assume that it obeys Newtons law of cooling. Its temperature ( boldsymbol{theta} ) is plotted against time ‘ ( t ). Tangents are drawn to the curve at the points ( Pleft(theta-theta_{1}right) ) and ( Qleft(theta-theta_{2}right) . ) These tangents meet the time axis at angles of ( phi_{2} ) and ( phi_{1} ) as shown. Then A ( cdot frac{tan phi_{2}}{tan phi_{1}}=frac{theta_{1}-theta_{o}}{theta_{2}-theta_{o}} ) B. ( frac{tan phi_{2}}{tan phi_{1}}=frac{theta_{2}-theta_{o}}{theta_{1}-theta_{o}} ) ( mathbf{c} cdot frac{tan phi_{1}}{tan phi_{2}}=frac{theta_{1}}{theta_{2}} ) D. ( frac{tan phi_{1}}{tan phi_{2}}=frac{theta_{2}}{theta_{1}} ) | 11 |

78 | On a hypothetical scale ( A ) the ice point is ( 42^{circ} ) and the steam point is ( 182^{circ} ) For another scale ( mathrm{B} ), the ice point is ( -10^{circ} ) and steam point in ( 90^{circ} ) ) If ( mathrm{B} ) reads ( 60^{circ} ) the reading of ( A ) is, ( mathbf{A} cdot 160^{circ} ) B. ( 140^{circ} ) ( c cdot 120^{circ} ) D. ( 110^{circ} ) | 11 |

79 | For a black body at a temperature of ( 727^{circ} mathrm{C}, ) Its radiated power is 60 watt and temperature of the surrounding is ( 227^{circ} mathrm{C} ) If the temperature of the black body is changed to ( 1227^{circ} mathrm{C} ), Then its radiating power will be ( mathbf{A} cdot 304 W ) B. 320 W c. ( 240 W ) D. ( 120 W ) | 11 |

80 | Two coils connected in parallel having resistances ( 300 Omega ) and ( 200 Omega a t 20^{0} C ) and temperature coefficient of resistivity ( 0.001 K^{-1} ) and ( 0.006 K^{-1} ) respectively.The effective temperature coefficient of the combination is A. ( 0.007 K^{-1} ) B . ( 0.004 K^{-1} ) D. ( 0.003 K^{-1} ) | 11 |

81 | The reason for quick hotness of sand more than the bank side water in a river is: A. Specific heat of water is more than sand B. Specific heat of water is less than sand c. specific heat of water is equal than sand D. Due to local conditions | 11 |

82 | Describe a Pyrometer. | 11 |

83 | When you heat a bowl of water, we can observe that water starts circulating. This demonstrates: A. conduction B. convection c. radiation D. none | 11 |

84 | Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at ( 100^{circ} mathrm{C}, ) while the other one is at ( 0^{0} mathrm{C} ). If the two bodies are brought into contact, then assuming no heat loss, the find common temperature is ( mathbf{A} cdot 0^{circ} C ) B. ( 550^{circ} mathrm{C} ) c. more than ( 50^{circ} mathrm{C} ) D. Less than ( 50^{circ} mathrm{C} ) but greater than ( 0^{circ} mathrm{C} ) | 11 |

85 | The temperature at which molecular energy is minimum on Kelvin temperature scale is called: A. Absolute Zero Temperature B. Zero Energy Temperature c. Absolute Temperature D. None of These | 11 |

86 | If ( 10 g ) of ice is added to ( 40 g ) of water at ( 15^{circ} mathrm{C}, ) then the temperature of the mixture is (specific heat of water= ( 4.2 times 10^{3} J k g^{-1} K^{-1}, ) Latent heat of fusion of ice ( =mathbf{3 . 3 6} times mathbf{1 0}^{mathbf{5}} boldsymbol{J} mathbf{k g}^{-mathbf{1}} mathbf{)} ) A ( cdot 15^{circ} mathrm{C} ) В. ( 12^{circ} mathrm{C} ) ( c cdot 10^{circ} C ) D. ( 0^{circ} mathrm{C} ) | 11 |

87 | The earth receives at its surface radiation from the sun at the rate of ( 1400 w / m^{2} . ) The distance of the centre of the sun from the surface of the earth is ( 1.5 times 10^{11} m ) and the radius of the ( operatorname{sun} ) is ( 7 times 10^{8} ) m. Treating sun as a black body, it follows from the above data that its surface temperature is ( mathbf{A} .5801 mathrm{k} ) В. ( 10^{6} ) к c. ( 50.1 mathrm{k} ) D. ( 5801^{0} mathrm{C} ) | 11 |

88 | Thermal conductivity of a metal rod depends on: A. area of cross section B. temperature gradient c. time of flow of heat D. none of these | 11 |

89 | What is a calorimeter? Name the material of which it is made of. Give two reasons for using the material stated by you. | 11 |

90 | Assertion Air is a bad conductor of heat. Reason It’s molecules are in Brownian motion. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

91 | The heat transfer in air is poor because A. it take place mainly due to convection B. it take place mainly due to conduction C. it take place mainly due to radiation D. all of the above | 11 |

92 | State True or False. According to principle of calorimetry heat absorbed by cold bodies is equal to heat released by hot bodies. A. True B. False | 11 |

93 | In CGS system water equivalent is expressed in thermal capacity is expressed in | 11 |

94 | Assertion It is hotter over the top of a fire than at the same distance on the sides. Reason Air surrounding the fire conducts more heat upwards. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

95 | A cubic vessel (with faces horizontal ( + ) vertical) contains an ideal gas at NTP. The vessel is being carried by a rocket which is moving at a speed of ( 500 mathrm{m} / mathrm{s} ) in vertical direction. The pressure of the gas inside the vessel as observed by us on the ground. A. Remains the same because ( 500 mathrm{m} / mathrm{s} ) is very much smaller than ( v_{r m s} ) of the gas B. Remains the same because motion of the vessel as a whole does not affect the relative motion of the gas molecules and the walls C. will increase by a factor equal to ( left[v_{r m s}^{2}+(500)^{2}right] / v_{r m s}^{2} ) where ( v_{r m s} ) was the original means square velocity of the gas D. Will be different on the top wall and bottom wall of the vessel | 11 |

96 | Heat capacity is This question has multiple correct options A. amount of heat energy taken per degree decrease in temperature B. amount of heat energy supplied per degree rise in temperature C. heat energy supplied per time taken D. all of the above | 11 |

97 | Two copper rods of the same length, but of different diameters of cross section are given the same amount of heat. Assuming no heat losses: A. Thick rod expands more linearly B. Thin rod expands more linearly C. Both rods expand equally linearly D. For large quantities of heat thick rod expands more and thin rod expands more for small quantities of heat. | 11 |

98 | f a piece of metal is heated to an absolute temperature ( T ) and then put in an enclosure at absolute temperature ( t ) then the heat generated in the atmosphere will be proportional to A ( cdot(T-t)^{4} ) B . ( T^{4}-t^{4} ) ( c cdot T^{2}-t^{2} ) D. ( T^{3}-t^{3} ) | 11 |

99 | The freezing point on a thermometer is marked as ( 20^{circ} ) and the boiling point as ( 150^{circ} . ) A temperature of ( 60^{circ} mathrm{C} ) on this thermometer will be read as A ( cdot 40^{circ} ) B . ( 65^{circ} ) ( mathrm{c} cdot 98^{circ} ) D. ( 110^{circ} ) | 11 |

100 | Latent heat of vaporization of water is 538 cal/g. During the conversion of 1 g of water to steam, if the external work done is ( 168 mathrm{J} ), the increase in internal energy is: A . 638 call ( l ) B. 538 саг ( l ) c. 498 call ( l ) D. 80 cal | 11 |

101 | A gas is kept at ( 13^{circ} mathrm{C} ) in a vessel. If the volume of the gas is kept constant and is heated, the pressure will be doubled to its initial pressure at a temperature ( mathbf{A} cdot 576 mathrm{K} ) B. 286 K c. ( 143 mathrm{k} ) D. 73 | 11 |

102 | The volume of a perfect gas at NTP is A. 22.4 litres B. 2.24 litres c. 100 litres D. None of these | 11 |

103 | 1 kg of cold water at ( 5^{circ} mathrm{C} ) is mixed with ( 5 k g ) of hot water at ( 65^{circ} mathrm{C} ). Calculate the final temperature of the water when it arrives at thermal equilibrium? A ( cdot 10^{circ} mathrm{C} ) В. ( 15^{circ} mathrm{C} ) ( mathbf{c} cdot 35^{circ} C ) D. ( 55^{circ} mathrm{C} ) E ( cdot 60^{circ} mathrm{C} ) | 11 |

104 | The mass of oxygen gas (in Kilo grams) occupying a volume of 11.2 litre at a temperature ( 27^{0} mathrm{C} ) and a pressure of ( 76 mathrm{cm} ) of mercury is : (Molecular weight of oxygen ( =32 ) ) A. 0.001456 B. 0.01456 c. 0.1456 D. 1.1456 | 11 |

105 | What happens during sublimation? A. Kinetic energy decreases B. Kinetic energy increases c. No movement of particles D. None of above | 11 |

106 | In two beakers ( (A text { and } B) 50 m l ) water of about ( 70^{circ} mathrm{C} ) each is taken. Then in beaker ( A, 50 m l ) of water of about ( 30^{circ} C ) is added and after 5 minutes, in beaker ( B, 50 m l ) of water of about ( 30^{circ} C ) is added. What would observe if the temperatures of both beakers recorded immediately? Why? | 11 |

107 | Boyle’s law is applicable for an: A. Adiabatic process B. Isothermal process c. Isobaric process D. Isochoric process | 11 |

108 | Clear nights are colder than cloudy nights because of A. conduction B. condensation c. radiation D. insolation | 11 |

109 | Ebonite handles are used to handle hot utensil because they are bad conductors of heat. A. True B. False | 11 |

110 | Infrared radiation are detected by A. spectrometer B. pyrometer c. nanometer D. photometre | 11 |

111 | The expansion of a solid body depends on: A. Mass of the solid only B. Nature of the solid only c. Temperature of the solid only D. Nature and temperature of the solid | 11 |

112 | An experiment is carried on a fixed amount of gas at different temperature and at high pressure such that it deviates from the ideal gas behaviour. The variation of ( frac{boldsymbol{p} boldsymbol{V}}{boldsymbol{R T}} ) with ( boldsymbol{p} ) is shown in the diagram. The correct variation will correspond to : A. curve ( A ) B. curve ( B ) c. curve ( C ) D. curve ( D ) | 11 |

113 | During an experiment an ideal gas is found to obey an additional gas law VT =constant. The gas is initially at temperature ( T ) and pressure P. When it is heated to the temperature 2 T, the resulting pressure is A . 2P B. P/2 ( c cdot 4 P ) D. P/4 | 11 |

114 | Two chambers, one containing ( m_{1} g ) of a gas at ( P_{1} ) pressure and other containing ( m_{2} g ) of a gas at ( P_{2} ) pressure are put in communication with each other. If temperature remains constant, the common pressure reached will be: | 11 |

115 | Express ( 45^{circ} mathrm{C} ) in kelvin. | 11 |

116 | A cycle tube has volume ( 2000 mathrm{cm}^{3} ) Initially the tube is filled to ( 3 / 4 ) th of its volume by air at pressure of ( 105 N / m^{2} ) It is to be inflated to a pressure of ( 6 x ) ( 10^{5} N / m^{2} ) under isothermal conditions. The number of strokes of pump, which ( operatorname{gives} 500 c m^{3} ) air in each stroke, to inflate the tube is A . 2 B. 12 ( c cdot 42 ) D. 1 | 11 |

117 | The volume of glass vessel is ( 1000 mathrm{cc} ) at ( 20^{circ} mathrm{C} . ) What volume of mercury should be poured into it at this temperature so that the volume of the remaining space does not change with temperature? Coefficient of cubical expansion of mercury and glass are ( 1.8 times ) ( mathbf{1 0}^{-4} /^{circ} mathbf{C} ) and ( mathbf{9 . 0} times mathbf{1 0}^{-mathbf{5}} /^{circ} mathbf{C} ) respectively. A . 100 c. в. ( 10 mathrm{cc} ) c. ( 500 c c ) D. 5 с. | 11 |

118 | Water is used as a coolant because: A. it has lower density. B. it has low specific heat. C. it has high specific heat D. it is easily available. | 11 |

119 | To make a tea, a tourist puts into a kettle 2 kg of ice at a temperature of ( 0^{circ} ) C. What quantity of heat is required to transform the ice into boiling water at ( 100^{circ} mathrm{C} ) temperature? | 11 |

120 | On a cold day when a room temperature is ( 15^{circ} mathrm{C}, ) the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of ( 15^{circ} mathrm{C} ), because A. metals have higher thermal capacity than plastics B. plastics have a lower density than metals C. metals are good conductor of heat D. plastics have a higher thermal conductivity than metals | 11 |

121 | A new temperature scale uses ( X ) as a unit of temperature, where the numerical value of the temperature ( t_{x} ) in this scale is related to the absolute temperature ( mathrm{T} ) by ( t_{x}=3 mathrm{T}+300 ) If the specific heat of a material using this unit is ( 1400 mathrm{Jkg}^{-1} mathrm{K}^{-1} ) its specific heat in the S.1. system of units is : ( mathbf{A} cdot 4200 J k g^{-1} K^{-1} ) B . ( 1400 mathrm{Jkg}^{-1} mathrm{K}^{-1} ) c. ( 466.7 mathrm{Jkg}^{-1} mathrm{K}^{-1} ) D. Impossible to determine from the information provided | 11 |

122 | What is the change in the temperature on Fahrenheit scale and on Kelvin scale, if a iron piece is heated from ( 30^{circ} ) to ( 90^{circ} mathrm{C} ? ) A ( cdot 108^{circ} F, 60 K ) в. ( 100^{circ} F, 55 K ) c. ( 100^{circ} F, 65 K ) D. ( 60^{circ} F, 108 K ) | 11 |

123 | State whether given statement is True or False : Mud houses are hot in summer and cold | 11 |

124 | Which of the following process(es) occur(s) during the convective transfer of heat within a large volume of air? This question has multiple correct options A. A continuous flow of warmer and cooler parts of air is established. B. The flow of air molecules results in flow of heat. C. The cooler portion of the air surrounding a warmer part exerts a buoyant force on it. D. As the warmer part of the air moves, it is replaced by cooler air that is subsequently warmed up. | 11 |

125 | A piece of metal weighs ( 46 mathrm{g} ) in air. When immersed in a liquid of specific gravity 1.24 at ( 27^{0} ) it weighs 30 g. When the temperature of the liquid is raised to ( 42^{0} ) in a liquid of specific gravity 1.20 it weighs ( 30.5 g . ) The coefficient of linear expansion of metal is A ( .2 .23 times 10^{-5} /^{0} C ) B . ( 6.7 times 10^{-5} /^{0} C ) c. ( 4.46 times 10^{-5} /^{0} C ) D. none of these | 11 |

126 | The quantity of heat flowing for ( 10 s ) through a rod of length ( 40 mathrm{cm}, ) area ( 50 mathrm{cm}^{2} ) is ( 200 mathrm{J} ). If the temperature difference at the ends of the rod is ( 80^{circ} mathrm{C} ) the coefficient of thermal conductivity of the rod in ( mathrm{Wm}^{-1} mathrm{K}^{-1} ) is: A . 20 B. 60 c. 80 D. 120 | 11 |

127 | Ammonium chloride is separated from a mixture of sodium chloride and ammonium chloride by the process of: A. evaporation B. sublimation c. fractional distillation D. filtration | 11 |

128 | The temperature of an isolated black body falls from ( T_{1} ) to ( T_{2} ) in time ( t, ) then ( t ) is (Let ( c ) be a constant) A ( cdot t=cleft(frac{1}{T_{2}}-frac{1}{T_{2}}right) ) B ( t=cleft(frac{1}{T_{2}^{2}}-frac{1}{T_{1}^{2}}right) ) ( ^{mathrm{c}} cdot_{t=c}left(frac{1}{T_{2}^{3}}-frac{1}{T_{1}^{3}}right) ) D ( t=cleft(frac{1}{T_{2}^{4}}-frac{1}{T_{1}^{4}}right) ) | 11 |

129 | Define the term ‘Heat capacity’ and state its S.I. unit. | 11 |

130 | The air becomes heated by A. Conduction B. Convection c. Radiation D. Expansion E. Diffusion | 11 |

131 | The ratio of densities of two bodies is 5: 6 and their specific heat in the ratio 3 : 5. The ratio of their thermal capacities per unit volume is: ( A cdot 25: 18 ) B. 1: c. 2: D. 1: | 11 |

132 | Heat flow can occur due to which of the following situation A. Pressure difference B. Temperature difference c. Density difference D. None of these | 11 |

133 | Density of a material varies with temperature. A . True B. False | 11 |

134 | A ( 1200 mathrm{kg} ) car is braked to a stop from ( 100 mathrm{km} / mathrm{h} . ) If ( 60 % ) of this energy appears in the steel brake drums, whose total mass is ( 10 mathrm{kg} ) its temperature will rise by ( left(s_{text {steel }}=450 mathrm{J} / mathrm{kg} mathrm{K}right) ) A . ( 31.2^{circ} mathrm{C} ) B. ( 61.7^{circ} mathrm{C} ) c. ( 92.1^{circ} mathrm{C} ) D. ( 42.1^{circ} mathrm{C} ) | 11 |

135 | A sphere of density ( d ), specific heat capacity ( c ) and radius ( r ) is hung by a thermally insulating thread in an enclosure which is kept at lower temperature than the sphere. The temperature of the sphere starts to drop at a rate which is proportional to: A ( cdot c / r^{3} d ) B . ( 1 / r^{3} d c ) ( mathbf{c} cdot 3 r^{3} d c ) D. ( 1 / r d c ) | 11 |

136 | ( 1 g ) of ice at ( 0^{0} C ) is converted to steam at ( 100^{0} C . ) The amount of heat required will be: ( left(L_{text {steam}}=536 c a l / gright) ) A . 756 call ( l ) B. 12000 cal c. 716 call ( l ) D. 450 call ( l ) and | 11 |

137 | Figure shows a copper rod joined to a steel rod. The rods have equal length and equal cross sectional area.The free and of the copper rod is kept at ( 0^{circ} mathrm{C} ) and that of the steeel rod is kept at ( 100^{circ} mathrm{C} ) Find the temperature at the junction of the rods. Conductivity of copper = ( 390 W / m^{circ} C ) and that of steel = ( 46 W / m^{circ} C ) ( 0^{circ} mathrm{C}left[begin{array}{ll}text { Copper } & text { Steel }end{array}right. ) ( mathbf{A} cdot 5.3^{circ} mathrm{C} ) B . ( 10.6^{circ} mathrm{C} ) ( mathbf{c} cdot 15.6^{circ} mathrm{C} ) D. None of these | 11 |

138 | The amount of heat energy given out by a given body when its temperature rises or falls by ( 1^{circ} C ) is called: A. latent heat of fusion B. specific heat capacity c. heat capacity D. latent heat of vaporisation | 11 |

139 | A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated uniformly to raise its temperature slightly: A. its speed of rotation increases B. its speed of rotation decreases c. its speed of rotation remains same D. its speed increases because its moments of inertia increases | 11 |

140 | Boiling is a surface phenomenon. A. True B. False | 11 |

141 | Which of the following gives evidence to kinetic theory of gases? A. assumption of kinetic theory B. Boyle’s law c. idea of mean free path D. diffusion and evaporation | 11 |

142 | Which of the substance is purified by sublimation? A. Naphthalene B. Benzoic acid c. camphor D. All of these | 11 |

143 | Calculate the mass of ice needed to cool ( 150 g ) of water contained in a calorimeter of mass ( 50 mathrm{g} ) at ( 32^{circ} mathrm{C} ) such that the final temperature is ( 5^{circ} mathrm{C} ) Specific heat capacity of calorimeter ( = ) ( mathbf{0 . 4} boldsymbol{J} / boldsymbol{g}^{boldsymbol{o}} boldsymbol{C} ) Specific heat capacity of water= ( 4.2 J / g^{o} C ) Latent heat capacity of ice ( =mathbf{3 3 0} boldsymbol{J} / boldsymbol{g} ) | 11 |

144 | If pressure on a gas is increased from ( boldsymbol{P} ) to ( 2 P, ) then its heat conductivity A . increases B. decreases c. becomes zero D. remains unchanged | 11 |

145 | When a metal sphere is heated maximum percentage increase occurs in its : A. Density B. Surface area c. Radius D. volume | 11 |

146 | A liquid thermometer uses the property of expansion of liquids. A. True B. False | 11 |

147 | The distance between the lower and upper fixed points of a Fahrenheit thermometer is ( 90 mathrm{mm} ). If mercury rises ( 30 mathrm{mm} ) above the lower fixed point then find the corresponding temperature. A ( cdot 65^{circ} ) В ( cdot 92^{circ} ) ( mathbf{c} cdot 62^{circ} F ) D. ( 60^{circ} mathrm{F} ) | 11 |

148 | The room temperature is ( +20^{circ} mathrm{C} ) when outside temperature is ( -20^{circ} mathrm{C} . ) Room temperature is ( +10^{circ} mathrm{C} ) when outside temperature is ( -40^{circ} mathrm{C} ). The temperature of the radiator heating the room is: A ( cdot 70^{circ} mathrm{C} ) В. ( 60^{circ} mathrm{C} ) ( mathbf{c} cdot 50^{circ} mathrm{C} ) D. ( 40^{circ} mathrm{C} ) | 11 |

149 | Define calorimetry. | 11 |

150 | Heat is measured by the principle of : A . length B. calorimetry c. temperature D. all of the above | 11 |

151 | If the temperature scale is changed from ( ^{circ} boldsymbol{F} ) to ( ^{circ} boldsymbol{C} ), the numerical value of specific heat will ( A ). increase B. decrease c. remain unchanged D. Nothing can be said | 11 |

152 | kg of iron at ( 100^{circ} mathrm{C} ) can melt more ice than ( 1 mathrm{Kg} ) of copper at same temperature. Explain ( .(text {Iron}= ) ( 0.117 mathrm{cal} g^{-1 o} C^{-1} ; s_{c o p p e r}= ) ( left.0.093 operatorname{cal} g^{-1}^{o} C^{-1}right) ) | 11 |

153 | A rectangular block is heated from ( 0^{circ} C ) to ( 100^{circ} C ). The percentage increase in its length is ( 0.2 % ).The percentage increase in its volume is: A. ( 0.6 % ) B. ( 0.10 % ) ( c .0 .2 % ) D. ( 0.4 % ) | 11 |

154 | 1.0 ( mathrm{kg} ) of water is contained in a ( 1.25 mathrm{kW} ) kettle. Calculate the time taken for the temperature of water to rise from ( 25^{circ} C ) to its boiling point ( 100^{circ} mathrm{C} ). Specific heat capacity of water ( =4.2 J g^{-1} K^{-1} ) | 11 |

155 | If ( 20 g ) m of water at ( 50^{circ} mathrm{C} ) is mixed with ( 60 g ) of water at ( 10^{circ} mathrm{C} ). Then calculate the final temperature of the mixture. | 11 |

156 | A wire of length ( 60 mathrm{cm} ) is bent into a circle with a gap of ( 1 mathrm{cm} . ) At its ends, on heating it by ( 100^{circ} mathrm{C} ), the length of the gap increases to ( 1) 02 mathrm{cm} . alpha ) of material of wire is A ( cdot 2 times 10^{-4} /^{circ} mathrm{C} ) B . ( 4 times 10^{-4} /^{circ} mathrm{C} ) c. ( 6 times 10^{-4} /^{circ} mathrm{C} ) D. ( 1 times 10^{-4} /^{circ} mathrm{C} ) | 11 |

157 | In vacuum, heat is transferred by A. conduction B. convection c. radiation D. all the above three | 11 |

158 | Why is an air-conditioner normally installed at the height in a room? | 11 |

159 | A body takes 10 minutes to cool from ( 60^{circ} mathrm{C} ) to ( 50^{circ} mathrm{C} . ) The temperature of surroundings is constant at ( 25^{circ} mathrm{C} ). Then, the temperature of the body after next 10 minutes will be approximately A ( cdot 43^{circ} mathrm{C} ) В . ( 47^{circ} mathrm{C} ) ( mathbf{c} cdot 41^{circ} C ) D. ( 45^{circ} mathrm{C} ) | 11 |

160 | The temperature increases is not notices in which of the following processed on providing heat to system? (I) Fusion at melting point (II) Phase transition at transition temperature (III) Boiling at boiling point (IV) A reaction in chemical equilibrium A . ।, ॥।, ॥। в. ।, ॥॥ c. ॥ा, । ॥ D. ॥, IV | 11 |

161 | The mass of a substance is 50 g and its specific heat is ( 0.09 mathrm{cal} mathrm{g}^{-1}^{o} mathrm{C}^{-1}, ) then its water equivalent is 45 g. State whether given statement is True/False A. True B. False | 11 |

162 | A piece of ice of mass ( 40 g ) is dropped into ( 200 g ) of water at ( 50^{circ} mathrm{C} ). Calculate the final temperature of the water after all the ice has melted. Specific heat capacity of water ( =4200 J k g^{-1} K^{-1} ) Specific latent heat of fusion of ice ( = ) ( 336 times 10^{3} J k g^{-1} ) | 11 |

163 | A ballon filled with air at ( 47^{circ} mathrm{C} ) has volume of 3 litre. If ballon is kept in a room its volume becomes 2.7 litre, the temperature of the room is : ( mathbf{A} cdot 5^{circ} mathbf{C} ) B. ( 10^{circ} mathrm{C} ) ( mathrm{c} cdot 15^{circ} mathrm{C} ) D. ( 20^{circ} mathrm{C} ) | 11 |

164 | A metallic solid sphere is rotating about is diameter as axis of rotation. If the temperature is increased by ( 200^{circ} mathrm{C} ) the percentage increased in its moment of inertia is (Coefficient of linear expansion of the metal ( =10^{-5} /^{circ} mathrm{C} ) A . ( 0 . ) B. 0.2 c. 0.3 D. 0.4 | 11 |

165 | State whether given statement is True or False Heat is an invisible form of energy, which causes the sensation of hotness or coldness. A. True B. False | 11 |

166 | A gas in a flexible container initially has volume of 320 L. If we decrease the pressure of the gas from 4.0 atm to 1.0 atm and decrease the temperature form 273 degrees Celsius to 0 degrees Celsius, what is the new volume of the gas? A. ( 0 L ) B. 320 L ( c cdot 160 L ) D. 640 L E. 80 | 11 |

167 | If ( 200 mathrm{J} ) of heat is added during the time interval from ( mathrm{B} ) to ( mathrm{C} ), the specific heat of the substance is. A ( cdot 200 J / k g^{o} C ) в. ( 100 mathrm{J} / mathrm{kg}^{circ} mathrm{C} ) c. ( 60 J / k g^{o} C ) D. ( 17 J / k g^{o} C ) ह ( cdot 1.67 mathrm{J} / mathrm{kg}^{circ} mathrm{C} ) | 11 |

168 | Solid which undergoes sublimation is : ( A cdot ) argon B. iodine c. sodium chloride D. water | 11 |

169 | Which of the following fabrics is preferred for winter garments? A. Nylon B. cotton c. wool D. silk | 11 |

170 | The forbidden gap in germanium crysta is A . 0.7 ev B. ( 1.12 X 10^{19} J ) c. Both 1 and 2 D. ( 1.1 e V ) | 11 |

171 | A substance cools from ( 75^{circ} mathrm{C} ) to ( 100^{circ} mathrm{C} ) in ( T_{1} ) minute, from ( 70^{circ} C ) to ( 65^{circ} C ) in ( T_{2} ) minute and from ( 65^{circ} mathrm{C} ) to ( 60^{circ} mathrm{C} ) in ( T_{3} ) minute, then A ( cdot T_{1}=T_{2}=T_{3} ) в. ( T_{1}<T_{2}T_{2}>T_{3} ) D. ( T_{1}T_{3} ) | 11 |

172 | State whether the given statement is True or False The boiling point of liquid increases with increase in pressure. | 11 |

173 | List List – II a. Temperature of water e. ( 273 mathrm{K} ) at the bottom of a lake b. ( gamma_{r} ) of water is – ve f. ( 277 mathrm{K} ) between c. ( gamma_{r} ) of water is positive g. above 277 ( k ) d. Temperature of water h. ( 273 mathrm{K} ) and just below ice layer in ( 277 mathrm{K} ) a Lake ( A cdot a-g, b-h, c-e, d-f ) B. a-h, b-e, c-f, d-g c. a-e, b-f, c-g, d-h D. a-f, b-h, c-g, d-e | 11 |

174 | When the temperature of water rises, the rate of evaporation A. increases B. decreases c. remain the same D. first decrease then increases | 11 |

175 | reported by two students ( X ) and ( Y ) for an experiment on the study of temperature-time graph. The experiment is likely to have been performed correctly by begin{tabular}{lll} Time (in min) & Student ( boldsymbol{X} ) & Student ( boldsymbol{Y} ) \ 0 & ( 61^{circ} mathrm{C} ) & ( 61^{circ} mathrm{C} ) \ 2 & ( 60.5^{circ} mathrm{C} ) & ( 59.0^{circ} mathrm{C} ) \ 4 & ( 60.0^{circ} mathrm{C} ) & ( 58.0^{circ} mathrm{C} ) \ hline 6 & ( 59.0^{circ} mathrm{C} ) & ( 57.5^{circ} mathrm{C} ) \ hline 10 & ( 58.0^{circ} mathrm{C} ) & ( 57.0^{circ} mathrm{C} ) \ hline 12 & ( 56.5^{circ} mathrm{C} ) & ( 56.5^{circ} mathrm{C} ) \ hline end{tabular} ( A cdot X ) B. ( Y ) c. both ( X ) and ( Y ) D. neithe | 11 |

176 | Heat is also called thermal energy A. True B. False | 11 |

177 | A body was supplied 1000 kilocalories of heat. Express this heat in mega joules. | 11 |

178 | Two numbers are in the ratio ( 9: 2 . ) If thhe smaller number is 320 ,find the larger number. | 11 |

179 | A given sample of an ideal gas occupies a volume ( V ) at a pressure ( P ) and absolute temperature T. The mass of each molecule of the gas is m. which of the following gives the density of the gas? A. mKT B. P/(kT) ( mathbf{c} cdot operatorname{Pm} /(mathrm{k} mathrm{T}) ) D. P/(KTV) | 11 |

180 | Melting point of Aluminium is: ( mathbf{A} cdot 1000^{circ} mathrm{C} ) B . ( 659^{circ} mathrm{C} ) ( mathbf{c} cdot 1500^{circ} mathrm{C} ) D. ( 100^{circ} mathrm{C} ) | 11 |

181 | The S.I unit of specific heat capacity is | 11 |

182 | The specific heat of a gas in a polytropic process is given by A. ( frac{R}{gamma-1}+frac{R}{N-1} ) в. ( frac{R}{1-gamma}+frac{R}{1-N} ) c. ( frac{R}{gamma-1}-frac{R}{N-1} ) D. ( frac{R}{1-gamma}-frac{R}{1-N} ) | 11 |

183 | Find the number of molecules in ( 1 mathrm{cm}^{3} ) of an ideal gas at ( 0^{0} C ) and at a pressure of ( 10^{-5} ) mm of mercury. | 11 |

184 | Choose the correct experiment to demonstrate the transfer of heat by the process of conduction. A. Take two metal blocks of same size & shape and heat one of them to a considerable temperature, then allow both the blocks to touch each other, after a while, you will see the other block gets heated due to contact B. Take two metal blocks of same size & shape and heat one of them to a considerable temperature, then keep the blocks separate, after a while you will see the other block gets heated due to contact. C. Take two metal blocks of same size & shape and heat one of them to a considerable temperature, then allow both the blocks to touch each other after the block get cooled down, after a while you will see the other block gets heated due to contact D. None of above | 11 |

185 | Two spherical balls ( A ) and ( B ) made of the same material, are heated to the same temperature. They are then placed in identical surroundings. If the diameter of ( A ) is twice that of ( B ), ratio of the rates of cooling of ( A ) and ( B ) will be A . 1: 1 B . 2: 1 c. 4: 1 D. 1: 4 | 11 |

186 | ‘The specific latent heat of fusion of ice is A ( cdot 136 . J g^{-1} ) в. ( 236 . J g^{-1} ) c. ( 336 J g^{-1} ) D. ( 436 J g^{-1} ) | 11 |

187 | Which of the following sublimes without heating even at the room temperature? A. Camphor B. Ammonium chloride c. Dry lce D. None of the above | 11 |

188 | Assertion The density of water remains constant as it is cooled from room temperature until its temperature reaches ( 4^{circ} C ) Reason Below ( 4^{circ} C ),the density increases. | 11 |

189 | To measure high temperatures ( > ) ( 2500^{circ} mathrm{C}, ) we use A. constant volume gas thermometer B. thermocouple c. resistance thermometer D. pyrometer | 11 |

190 | What is the final temperature of the mixture of 300 g of water at ( 25^{circ} mathrm{C} ) added to 100 of ice at ( 0^{circ} C ) ( mathbf{A} cdot 0^{circ} C ) B. ( 1^{circ} mathrm{C} ) ( mathbf{c} cdot 2^{o} C ) D. ( 3^{circ} mathrm{C} ) | 11 |

191 | What will not be obtained in the sublimate when a mixture of sand, sulphur, common salt and iodine is sublimed? A. sand B. lodine c. sulphur D. common salt | 11 |

192 | When the temperature of water rises the rate of evaporation decreases. State whether true or false. A. True B. False | 11 |

193 | Two copper rods ( P, Q ) of thickness in the ratio 2: 5 taken. If both the rods ( P, Q ) of lengths ( 10 mathrm{cm} ) are heated to same temperature rise, then the ratio of the linear expansions of ( P ) to that of rod ( Q ) is: A .2: 5 B. 5: 2 ( c cdot 1: 1 ) ( D cdot 4: ) | 11 |

194 | What is the difference between Land and Sea breeze? | 11 |

195 | A can is taken out from a refrigerator at ( 0^{circ} mathrm{C} . ) The atmospheric temperature is ( 25^{circ} mathrm{C} . ) If ( t_{1} ) is the time taken to heat from ( 0^{circ} mathrm{C} ) to ( 5^{circ} ) and ( t_{2} ) is the time taken from ( 10^{circ} mathrm{C} ) to ( 15^{circ} mathrm{C}, ) then A ( cdot t_{1}>t_{2} ) в. ( t_{1}<t_{2} ) c ( cdot t_{1}=t_{2} ) D. There is no relation | 11 |

196 | A wire of uniform cross-section is suspended vertically from fixed point with a load attached to the other end. What will be the ratio of change in frequency to the altered new frequency due to arise of temperature ( t^{circ} ) C? The coefficient of linear expansion of wire is ( alpha ) and the rise of temperature t is small. A ( cdot frac{alpha t}{4} ) в. ( frac{alpha t}{2} ) ( c cdot frac{3 a t}{4} ) D. ( alpha ) | 11 |

197 | The temperature of boiling water in the Kelvin scale of temperature is: ( mathbf{A} cdot 100 mathrm{K} ) B. 373.15 К c. 212 к D. 273.15 К | 11 |

198 | ( 50 g ) of copper is heated to increase its temperature by ( 10^{circ} mathrm{C} . ) If the same quantity of heat is given to ( 10 mathrm{gm} ) of water, the rise in temperature is (specific heat of copper ( =420 ) J ( k g^{-1} K^{-1}, ) specific heat of water ( =4200 ) ( left.k g^{-1} K^{-1}right) ) ( A cdot 5^{circ} mathrm{C} ) B . ( 6^{circ} mathrm{C} ) ( c cdot 7^{o} ) D. ( 8^{circ} mathrm{C} ) | 11 |

199 | When a metal conductor connected to left gap of a meter bridge is heated, the balancing point. A. Shifts towards right B. Shifts towards left c. Remains unchanged D. Remains at zero | 11 |

200 | Two bodies ( A ) and ( B ) are said to be in thermal equilibrium with each other, if : A. heat flows from A to B B. heat flows from B to A c. both the bodies lose equal amounts of heat to the atmosphere D. heat does not flow from either A or B | 11 |

201 | The melting point of pure ice is | 11 |

202 | A glass full of hot milk is poured on the table . It begins to cool gradually. Which of the following is incorrect? A. The rate of cooling is constant till milk attains the temperature of the surrounding B. The temperature of milk falls of exponentially c. While cooling there is a flow of heat from milk to the surrounding as well as from surrounding to the milk but the net flow of heat is from milk to the surrounding and that is why it cools. D. All three phenomenon,conduction,convection and radiation are responsible for the loss of heat from milk to the surroundings | 11 |

203 | A thin brass sheet at ( 10^{circ} C ) and thin steel sheet at ( 20^{circ} C ) have the same surface area.The common temperature at which both would have the same area (Coefficient of linear expansion for brass and steel are respectively ( 19 times ) ( left.10^{-6} /^{circ} mathrm{C} text { and } 11 times 10^{-6} /^{circ} mathrm{C} .right) ) ( mathbf{A} cdot-3.75^{circ} mathrm{C} ) B . ( -2.75^{circ} mathrm{C} ) c. ( 2.75^{circ} mathrm{C} ) D. ( 3.75^{circ} mathrm{C} ) | 11 |

204 | Calculate thermal capacity of solid of mass ( 0.8 ~ k g ) and specific heat capacity of ( 0.4 J / g^{o} C ) ( mathbf{A} cdot 160 J^{circ} C^{-1} ) B. ( 320 J^{circ} C^{-1} ) c. ( 640 J^{circ} C^{-1} ) D. ( 960 J^{circ} mathrm{C}^{-1} ) | 11 |

205 | The amount of heat required to change from liquid state to gaseous state without rise in its temperature is called | 11 |

206 | Examples of radiations are: A. a microwave oven B. refrigeration c. monsoon D. none of the above | 11 |

207 | toppr OG Q Type your question_ is ( 50^{circ} mathrm{C} ) and ( 15 Omega ) respectively The rate of change of resistance ( R ) with temperature ( frac{1}{2} Omega /^{circ} C ) and rate of decrease of temperature of ( R ) is ( frac{(e n 3)}{100} ) times the temperature difference from surrounding Assume the resistance ( R ) loses heat only in accordance with newton’s law of cooling If key k is closed at ( t=0 ) then choose the incorrect option A. The value of R for which power dissipation in it is maximum is ( 5 Omega ) B. Temperature of R when power dissipation in it is maximum is ( 30^{circ} mathrm{C} ) C. Time after which power dissipation in it is maximum is 100 sec D. Current throughout 10 v battery when power dissipation in ( R ) is maximum is 2.5 A | 11 |

208 | From the following which are the factors affecting the rate of evaporation? A. Temperature B. Humidity c. Exposed Surface Area D. All of the above | 11 |

209 | Why is the freezing chest (or cooling unit) in a refrigerator fitted near the top? | 11 |

210 | Unit of latent heat of fusion is : ( A cdot K ) B. J/Kgg ( c cdot J / K ) D. J/Kg-K | 11 |

211 | For a liquid, the coefficients of apparent expansion ‘ ( gamma_{a} ) ‘and real expansion ( ^{prime} gamma_{r} ) are related as: ( A cdot gamma_{a}=gamma_{r} ) в. ( gamma_{a}gamma_{r} ) D. ( frac{gamma_{a}}{gamma_{r}}= ) constant | 11 |

212 | Two copper rods ( P, Q ) of thickness in the ratio 2: 5 taken. If both the rods ( P, Q ) of lengths ( 10 mathrm{cm} ) are heated to same temperature rise, then the ratio of the linear expansions of ( P ) to that of rod ( Q ) is: A .2: 5 B. 5: 2 ( c cdot 1: 1 ) ( D cdot 4: ) | 11 |

213 | 150 g of ice is mixed with 100 g of water at temperature ( 80^{circ} mathrm{C} ). The latent heat of ice is 80 cal/g and the specific heat of water is 1 cal/g ( -^{circ} C ). Assuming no heat loss to the environment, the amount of ice which does not melt is A. ( 100 mathrm{g} ) B. 08 c. ( 150 g ) D. 50 | 11 |

214 | When ( M_{1} ) gram of ice at ( -10^{0} C ) (specific heat ( =mathbf{0 . 5} ) calg( ^{10} boldsymbol{C}^{-1} ) ) is added to ( M_{2} ) gram of water at ( 50^{circ} C ) finally no ice is left and the water is at ( 0^{o} C . ) The value of latent heat of ice, in cal ( g^{-1} ) is: ( ^{mathrm{A}} cdot frac{5 M_{1}}{M_{2}}-50 ) в. ( frac{5 M_{2}}{M_{1}} ) c. ( frac{50 M_{2}}{M_{1}}-5 ) D. ( frac{5 M_{2}}{M_{1}}-5 ) | 11 |

215 | On heating metal plate having two holes at certain separation the distance between the centres of the holes A. Increases B. Decreases c. Remains same D. Cannot be said | 11 |

216 | A temperature difference of ( 15^{circ} mathrm{C} ) on the Fahrenheit scale is A ( cdot 27^{circ} ) В. ( 59^{circ} ) c. ( -27^{circ} ) ( D cdot-59^{o} ) | 11 |

217 | A second pendulum clock having steel wire is calibrated at ( 20^{0} C . ) When temperature is increased to ( 30^{0} C ), then how much time does the clock lose or ( operatorname{gain} ) in one week ( ? ) ( left[boldsymbol{alpha}_{text {steel}}=mathbf{1 . 2} times mathbf{1 0}^{-mathbf{5}}left(^{0} boldsymbol{C}right)^{-mathbf{1}}right] ) B. ( 3.626 s ) c. ( 362.8 s ) D. 36.28S | 11 |

218 | Why is the base of a cooking pan generally made thick? | 11 |

219 | The absolute zero is the temperature at which: A. all substances exist is solid state B. molecular motion ceases c. water freezes D. none of these | 11 |

220 | A sample of an ideal gas occupies a volume ( V ) at pressure ( P ) and absolute temperature T. The mass of each molecule is m. The equation for density is ( mathbf{A} cdot m K T ) в. ( frac{P}{K T} ) c. ( frac{P}{K T V} ) D. ( frac{P m}{K T} ) | 11 |

221 | Two liquids ( A ) and ( B ) are ( a t 30^{circ} C ) and ( 20^{circ} mathrm{C} ) respectively. When they are mixed in equal masses, the temperature of the mixture is found to be ( 26^{circ} mathrm{C} ). The ratio of specific heat is : ( A cdot 4: 3 ) B. 3:4 ( c cdot 2: 3 ) D. 3:2 | 11 |

222 | Two identical beakers with negligible thermal expansion are filled with water to the same level at ( 4^{circ} mathrm{C} ). If one say A is heated while the other one is cooled, then: This question has multiple correct options A. water level in A must rise B. water level in B must rise c. water level in A must fall D. water level in Bmust fall | 11 |

223 | Calculate the mass of ice required to lower the temperature of ( 300 g ) of water at ( 40^{circ} mathrm{C} ) to water at ( 0^{circ} mathrm{C} ). (Specific latent heat of ice ( =336 mathrm{J} / mathrm{g}, ) Specific heat capacity of water ( left.=4.2 mathrm{J} / mathrm{g}^{circ} mathrm{C}right) ) | 11 |

224 | Which of the following gives off a purple vapour when sublimes? A. Sodium hydroxide, NaOH(s) B. Graphite, c(s) c. Iron(III) chloride, ( F e C l_{3}(s) ) D. sucrose, ( C_{12} H_{22} O_{11} ) (s) E . lodine, ( I_{2} ) (s) | 11 |

225 | A solid copper sphere (density ( rho ) and specific capacity ( C ) ) of radius ( r ) at an initial temperature of ( 200 mathrm{K} ) is supended inside a chamber whose walls are at almost 0 K. The time required for the temperature of the sphere to drop to ( 100 mathrm{K} ) is A ( cdot frac{7 r rho C}{72 times 10^{6} sigma} ) в. ( frac{r rho C}{6 sigma} ) c. ( frac{r rho C}{sigma} ) D. none of the above | 11 |

226 | Heat of conduction flows in the direction of decreasing: A. Temperature B. Pressure c. Density D. None of these | 11 |

227 | Describe an experiment to verify the Boyles law. | 11 |

228 | A Centigrade and Fahrenheit thermometers are dipped in boiling water. The water temperature is lowered until the Fahrenhit thermometer registers ( 140 . ) The fall in temperature as registered by centigrade thermometer is ( A cdot 30 ) B . 40 ( c cdot 60 ) D. ( 80^{circ} ) | 11 |

229 | Find the amount of heat supplied to decrease the volume of an ice water mixture by ( 1 mathrm{cm}^{3} ) without any change in temperature. ( left(rho_{text {ice}}=0.9 rho_{text {water}}, L_{text {ice}}=right. ) ( mathbf{8 0} ) cal ( / mathbf{g m} ) A . 360 call B. 500 call c. 720 call ( l ) D. none of these | 11 |

230 | State whether given statement is True or False Woollen yard is a bad conductor of heat. | 11 |

231 | Which of the following element is not in the liquid state at room temperature? A. ( H g ) в. ( L i ) ( c . G a ) D. ( B r ) | 11 |

232 | The pressure of a gas is increased four times and its absolute temperature two times. The ratio of its final volume to its initial volume is A . 1: 2 B. 2: ( c cdot 1: ) D. 3: | 11 |

233 | Which one of the liquids, has the highest specific heat capacity? A. water B. Ether c. Alcohol D. None of the above | 11 |

234 | There are two spheres of same material and radius. One is solid and the other is hollow. If they are heated to the same temperature the expansion of: A. Solid sphere is more. B. Hollow sphere is more c. Solid and hollow spheres are equal. D. Solid is outwards while that of hollow inwards | 11 |

235 | Two bodies ( A ) and ( B ) at temperatures ( 327^{circ} mathrm{C} ) and ( 277^{circ} mathrm{C} ) are kept in vacuum chamber at ( 27^{circ} mathrm{C} ). Then ratio of their rates of loss of heat in a given time interval is nearly. ( A cdot 2: ) B. 1: 2 ( c cdot 1: 4 ) D. 4: 1 | 11 |

236 | When spheres are given the same amount of heat. A. 1: 2: 3 B. 1: 1: 1 ( mathrm{c} cdot 3: 2: 1 ) D. none of these | 11 |

237 | The excess temperature of a body falls from ( 12^{circ} mathrm{C} ) to ( 6^{circ} mathrm{C} ) in 5 minutes, then the time to fall the excess temperature from ( 6^{circ} mathrm{C} ) to ( 3^{circ} mathrm{C} ) is (assume the Newton’s cooling is valid) A . 10 minutes B. 7.5 minutes c. 5 minutes D. 2.5 minutes | 11 |

238 | The pressure of a certain mass of gas at ( 27^{0} mathrm{Cis} 84 mathrm{cm} ) of Hg. If ( 25 % ) of the gas is now introduced into the same vessel at the same temperature, the final pressure of the gas will be in cm of Hg A . 105 B. 100 ( c cdot 95 ) D. 90 | 11 |

239 | The process by which heat is transferred without the help of any material medium is called | 11 |

240 | There is a small hole in a hollow container. At what temperature should it be maintained in order that it emits one calorie of energy per second per meter ( ^{2} ) ? ( A cdot ) 10K в. ( 100 k ) c. २००к D. 500k | 11 |

241 | The rate of cooling of water is when the difference in the temperature of water and the ambience is large. | 11 |

242 | Air is a good conductor of heat. True or false. A . True B. False | 11 |

243 | The unit of coefficient of linear expansion is A . ( m ) B ( cdot m C^{-1} ) ( c . c ) D. ( C^{-1} ) | 11 |

244 | The liquids and gases only have cubical expansion. True or false. A. True B. False | 11 |

245 | ( 5 mathrm{Gm} ) of steam at ( 100^{circ} mathrm{C} ) is passed into ( 6 mathrm{gm} ) of ice at ( 0^{circ} mathrm{C} ). If the latent heats of steam and ice n cal per ( mathrm{gm} ) are 540 and 80 respectively, them the final temperature is:- ( mathbf{A} cdot 0^{circ} C ) B. ( 100^{circ} mathrm{C} ) ( mathbf{c} cdot 50^{circ} C ) D. ( 30^{circ} mathrm{C} ) | 11 |

246 | If ( lambda_{m} ) denotes the wavelength at which the radioactive emission from a black body at a temperature ( T K ) is maximum then: A. ( lambda ) is independent of ( T ) в. ( lambda_{m} propto T ) ( mathbf{c} cdot lambda_{m} propto T^{-1} ) D. ( lambda_{m} propto T^{-4} ) | 11 |

247 | Compared to a burn due to water at ( 100^{circ} ) C, a burn due to steam at ( 100^{circ} mathrm{C} ) is A. more dangerous B. less dangeour c. equally dangerous D. none of these | 11 |

248 | For a cube and a sphere made of same material, what should be the ratio of the side of the cube to the radius of the sphere such that both of them have the same thermal capacity? A ( cdot sqrt[3]{frac{4}{3} pi} ) B. ( sqrt[3]{frac{5}{3} pi} ) c. ( sqrt[3]{frac{3}{4} pi} ) D. ( sqrt[3]{frac{2}{3} pi} ) | 11 |

249 | Two liquids at temperatures ( 60^{circ} mathrm{C} ) and ( 20^{circ} mathrm{C} ) respectively have masses in the ratio 3: 4 and their specific heats in the ratio ( 4: 5 . ) If the two liquids are mixed, the resultant temperature is ( mathbf{A} cdot 70^{circ} C ) B. ( 50^{circ} mathrm{C} ) ( mathbf{c} cdot 40^{circ} C ) D. ( 35^{circ} mathrm{C} ) | 11 |

250 | A metallic calorimeter of mass 100 g contains 200 g of ice and the initial temperature of the calorimeter and the ice is ( -10^{circ} mathrm{C} . ) Heat is supplied to the system containing calorimeter and ice at a constant rate of 50 cals( ^{-1} ). Find the time required to raise the temperature of the system to ( 50^{circ} mathrm{C} ). [Neglect the loss of heat to the surroundings]. Take specific heat capacity of calorimeter and ice as ( 0.2 c a l g^{-1 circ} C^{-1} ) and ( frac{1}{2} c a l g^{-1 circ} C^{-1} ).Take latent heat of fusion of ice as ( 80 mathrm{calg}^{-1} ) and specific heat capacity of water as 1 calg( ^{-1 circ} C^{-1} ) | 11 |

251 | Define heat capacity and state its ( mathrm{S} ) I unit. | 11 |

252 | Give a reason for the following observations: (a) Naphthalene balls disappear with time without leaving any solid. (b) We can get the smell of perfumes sitting several metres away. | 11 |

253 | The melting of ice is also known as having the property of A. Latent heat of fusion B. Latent heat of vaporisation c. Latent heat of fermentation D. Latent heat of sublimation | 11 |

254 | A cycle tube has volume ( 2000 mathrm{cm}^{3} ) Initially the tube is filled to ( 3 / 4 ) th of its volume by air at pressure of ( 105 N / m^{2} ) It is to be inflated to a pressure of ( 6 x ) ( 10^{5} N / m^{2} ) under isothermal conditions. The number of strokes of pump, which ( operatorname{gives} 500 c m^{3} ) air in each stroke, to inflate the tube is A . 2 B. 12 ( c cdot 42 ) D. 1 | 11 |

255 | An aluminium rod (length ( l_{1} ) and coefficient of linear expansion ( alpha_{A} ) ) and a steel rod (length ( l_{2} ) and coefficient of linear expansion ( alpha_{B} ) ) are joined together. If the length of each rod increased by the same amount when their temperatures are raised by ( t^{o} C ) then ( l_{1} /left(l_{1}+l_{2}right) ) is: A ( cdot alpha_{A} / alpha_{B} ) в. ( alpha_{B} / alpha_{A} ) c. ( alpha_{B} / alpha_{A}+alpha_{B} ) D. ( alpha_{A} / alpha_{A}+alpha_{B} ) | 11 |

256 | Heat flows between two bodies due to difference in their | 11 |

257 | toppr Loain Jolv Now Q Type your question107 and a. which must be invested in reaction to get it started a state in which the rate of forward baction is exactly equal to the rate of the reverse reaction. a process c. or reaction which consumes heat a process or reaction that releases heat. t. A ( A ) ( (a rightarrow t) ) ( (b rightarrow q) ) ( (c rightarrow s) ) ( (d rightarrow r) ) в. ( (a rightarrow q) ) ( (b rightarrow p) ) ( (c rightarrow r) ) ( (d rightarrow s) ) ( mathbf{c} cdot(a rightarrow t) ) ( (b rightarrow p) ) ( (c rightarrow s) ) ( (d rightarrow r) ) D. ( (a rightarrow s) ) ( (b rightarrow r) ) ( (c rightarrow q) ) ( (d rightarrow p) ) | 11 |

258 | Assertion Snow is better insulator than ice. Reason Snow contain air packet and air is good insulator of heat. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 11 |

259 | Show that volume expansion coefficient is three times the linear expansion coefficient for a solid. | 11 |

260 | Two guys in a room are feeling abnormalities. One of them wearing black suit and the other one wearing white suit are feeling different temperature on their body. Which of the following statements is correct : A. Black suit guy will feel more heat due to its black colo B. White suit guy will feel more heat due to its white color c. Both will feel same heat D. Neither A nor B | 11 |

261 | At constant pressure, density of a gas is: A. directly proportional to absolute temperature B. inversely proportional to absolute temperature C. independent of temperature D. directly proportional to square root of absolute temperature | 11 |

262 | Heat is a A. form of energy. B. property of the material. C. universal constant. D. theoretical assumption. | 11 |

263 | If 10 g of ice at ( 0^{circ} C ) mixes with 10 g of water at ( 10^{circ} mathrm{C} ), then the final temperature ( t ) is given by A ( cdot(10 times 80)+10(t-0)=10(10-t) ) в. ( 10 times 80=10(10-t)+10(t-0) ) c. ( t=5^{circ} mathrm{C} ) D . ( t=0^{circ} mathrm{C} ) | 11 |

264 | ( 150 mathrm{g} ) of ice is mixed with ( 100 mathrm{g} ) of water at temperature ( 80^{circ} mathrm{C} ). The latent heat of ice is 80 ca/g and the specific heat of water is ( 1 mathrm{cal} / mathrm{g}-^{circ} mathrm{C} ). Assuming no heat loss to the environment, the amount of ice which does not melt is A. ( 100 mathrm{g} ) B. 08 c. ( 150 mathrm{g} ) D. 50g | 11 |

265 | Two rods of same length and same area of cross section are joined. Temperature of two ends are as shown in figure. As we move along the rod, temperature are as shown in following. ( mathbf{A} cdot K_{1}>K_{2} ) B ( . K_{1}=K_{2} ) ( mathbf{c} cdot K_{1}<K_{2} ) D. None of these | 11 |

266 | Liquid ammonia is used in ice factory for making ice from water. If water at ( 20^{circ} mathrm{C} ) is to be converted to ( 2 mathrm{kg} ) ice at ( 0^{circ} mathrm{C}, ) how many grams of ammonia are to be evaporated? (Given:The latent heat of vapourization of ammonia ( = ) ( 341 mathrm{cal} / mathrm{g} ) | 11 |

267 | Same quantity of ice is filled in each of the two metal containers P and Q having the same size, shape and wall thickness but made of different materials. The containers are kept in identical surroundings. The ice in ( mathrm{P} ) melts completely in time ( t_{1} ) whereas that in ( Q ) takes a time ( t_{2} . ) The ratio of thermal conductivities of the materials of ( P ) and ( Q ) is ( mathbf{A} cdot t_{2}: t_{1} ) B . ( t_{1}: t_{2} ) ( mathbf{c} cdot t_{1}^{2}: t_{2}^{2} ) D. ( t_{2}^{2}: t_{1}^{2} ) | 11 |

268 | If the temperature of hot body is raised by ( 5 % ) then the heat energy radiated would increase by A . ( 18 % ) B . 24% c. ( 16 % ) D . 21% | 11 |

269 | A volume ‘V’ and temperature ‘T’ was obtained, as shown in the diagram, when a given mass of gas was heated. During the heating process, the pressure is A . increased B. decreased c. remains constant D. changed erratically | 11 |

270 | If the molar heat capacity of a gas in the process ( P T=c o n s t a n t ) is ( 5 R ), the number of degrees of freedom of molecules in the gas is A . 4 B. 5 ( c .6 ) D. | 11 |

271 | t is given that rate of heat transfer in convection is directly proportional to area of plate across which fluid flows ( boldsymbol{A} ) , density of fluid ( (rho), ) velocity of flow ( (V ) ,temperature difference ( (t) ) with proportionality constant of 2 units.Also fluid is flowing across edge to edge on a square plate of side length of 0.1 unit with density of fluid is 10 units and velocity of 2 units. Then what will be the rate of heat conducted through the plate if temperature difference between plate and fluid is unity?(assume that all ( u n i t s ) are in international standards | 11 |

272 | Two bodies A and B are said to be in thermal equilibrium with each other, if A. heat flows from A to B B. heat flows from B to A C. both the bodies lose equal amunts of heat to the atmosphere D. heat does not flow from either A or B | 11 |

273 | A metal rod has the length of ( 50 mathrm{cm} ) at ( 20^{circ} mathrm{C} . ) When it is heated to ( 95^{circ} mathrm{C} ), its length becomes ( 50.06 mathrm{cm} . ) Find the length of the rod at ( 0^{circ} mathrm{C} ) | 11 |

274 | The amount of heat required to raise the temperature of a body by ( 1^{0} mathrm{C} ) is called A . latent heat B. specific heat c. thermal capacity D. none of these | 11 |

275 | By imparting heat to a body, its temperature rises by ( 15^{circ} mathrm{C} ). What is the corresponding rise in temperature on kelvin scale? A. ( 15 ~ K ) B . ( 288 K ) c. ( -15 ~ K ) D. None of the above | 11 |

276 | Radiation is passing through a transparent medium, then: A. the temperature of medium increases B. the temperature of medium decreases C. the temperature of medium does not alter D. the temperature of medium first increases and then becomes steady | 11 |

277 | Which of the following is an example of convection? A. The heat of the sun warming our planet B. The heat from an electric stove warming a frying pan C . Ice cubes cooling a drink D. A microwave oven cooking a meal E. An overhead fan cooling a room | 11 |

278 | What will be the amount of heat required to convert ( 50 g ) of ice at ( 0^{circ} mathrm{C} ) to water at ( 0^{circ} mathrm{C} ) ? A . 400 cal B. 4000 cal c. 3000 cal D. 300cal | 11 |

279 | Which of the following will not sublime? A. Ammonium chloride B. Camphor c. lodine D. Bromine | 11 |

280 | A metal rod having a linear coefficient of expansion ( 2 times 10^{-5} /^{circ} mathrm{C} ) has a length 1 ( mathrm{m} ) at ( 25^{circ} mathrm{C}, ) the temperature at which it is shortened by ( 1 mathrm{mm} ) is : ( A cdot 50^{circ} mathrm{C} ) B. ( -50^{circ} mathrm{C} ) c. ( -25^{circ} mathrm{C} ) D. ( -12.5^{circ} mathrm{C} ) | 11 |

281 | Electric heaters used for cooking have the filament or the heating coil on a plate made up of clay because: A. clay is a bad conductor of heat B. clay is a bad conductor of electricity c. clay is necessary for good taste ( D cdot operatorname{both} A & B ) | 11 |

282 | Find the odd one out. (i) Camphor, Ammonium Chloride, Naphthalene balls, Sugar (ii) Turmeric, Methyl Orange, Rose petals, Beetroot. | 11 |

283 | ( 0.08 k g ) of a substance is heated from ( 30^{circ} mathrm{C} ) to ( 130^{circ} mathrm{C}, ) when 2000 calories of energy is supplied to it. Calculate the specific heat capacity of the substance in (a) calories (b) joules. | 11 |

284 | A uniform thin rod of length ( l ) is standing on a smooth horizontal surface. A slight disturbance causes the lower end to slip to the smooth surface and the rod starts falling. Based on this information mark the correct option. A. The center of mass will move along a straight line. B. The path followed by the end of the rod which is in contact with the ground is circular C. the path followed by the end of the rod (which is not in contact with the ground) is circular D. The angular velocity of the rod when it is about to hit about to hit the ground is ( sqrt{frac{3 g}{2 l}} ) | 11 |

285 | At ( 20^{circ} C ) temperature and latmosphere pressure if a gas has a volume of ( 293 mathrm{ml} ) Its volume at NTP is A .546 cc B. 273 сс c. 293 сс D. 124 сс | 11 |

286 | Two closed vessels of the equal volume contain air at ( 105 mathrm{kPa} ) at ( 300 mathrm{K} ) and are connected through a narrow tube. If one of the vessels is now maintained at ( 300 mathrm{K} ) and the other at ( 400 mathrm{K} ) then the pressure becomes. A . 120kPa B. 105kPa c. ( 150 k P a ) D. 300kPa | 11 |

287 | Heat is added to an ideal gas, and the gas expands. In such a process the temperature A. must always increase B. will remain the same if the work done equals the heat added C. must always decrease D. will remains the same If change in internal energy equals the heat added. | 11 |

288 | Camphor can be separated using: A. distillation B. sublimation C. fractional distillation D. centrifugation | 11 |

289 | Assertion Two bodies at the same temperature may contain different amounts of heat Reason Two bodies may require different amounts of heat to maintain or acquire same temperature A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

290 | A liquid of specific heat 0.3 at ( 90^{circ} mathrm{C} ) is mixed with another liquid of specific heat 0.5 at ( 15^{circ} mathrm{C} ). If final temperature of the mixture is ( 60^{circ} mathrm{C} ), then find the ratio of masses of the two liquids mixed. | 11 |

291 | A refrigerator converts ( 100 g ) of water at ( 20^{circ} mathrm{C} ) to ice at ( -10^{circ} mathrm{C} ) in 35 minutes Calculate the average rate of heat extraction in terms of watts. Given: Specific heat capacity of ice ( = ) ( 2.1 J g^{-1 o} C^{-1} ) Specific heat capacity of water ( = ) ( 4.2 J g^{-1 o} C^{-1} ) Specific Latent heat of fusion of ice ( 336 J g^{-1} ) | 11 |

292 | ( sum_{i=1}^{frac{-1}{2}} ) | 11 |

293 | Two marks on a glass rod ( 10 mathrm{cm} ) apart are found to increase their distance by ( 0.08 mathrm{mm} ) when the rod is heated from ( 0^{circ} mathrm{C} ) to ( 100^{circ} mathrm{C} ). A flask made of the same glass as that of rod measures a volume of ( 100 mathrm{cc} ) at ( 0^{circ} mathrm{C} ). The volume it measures at ( 100^{circ} mathrm{C} ) in cc is A . 100.24 B. 100.12 c. 100.36 D. 100.48 | 11 |

294 | The temperature of equal masses of three different liquids ( A, B, C ) are ( 12^{circ} mathrm{C}, 19^{circ} mathrm{C} ) and ( 28^{circ} mathrm{C} ) respectively. The temperature, when ( A ) and ( B ) are mixed, is ( 16^{circ} mathrm{C} ) and when ( B ) and ( C ) are mixed, is ( 23^{circ} mathrm{C} ). What will be the temperature when ( A ) and ( C ) are mixed? | 11 |

295 | A sphere of radius ( 1.00 mathrm{cm} ) is placed in the path of a parallel beam of light of large aperture. The intensity of the light is ( 0.50 W quad c m^{-2} . ) If the sphere completely absorbs the radiation falling on it, find the force exerted by the light beam on the sphere | 11 |

296 | A piece of blue glass when heated to a high temperature and a piece of red glass at room temperature are taken inside a dimly-lighted room. Then: A. The blue piece will look blue and the red piece will look red as usual B. The red piece will look brighter red and the blue piece will look ordinary blue c. The blue piece will look brighter red compared to the red piece D. Both the piece will look equally red | 11 |

297 | Choose the correct statement of the following. A. Conversion of solid into vapours without passing through the liquid state is called vapourisation. B. Conversion of solid into vapours without passing through the liquid state is called sublimation. C. Conversion of vapours into solid without passing through the liquid state is called freezing D. Conversion of solid into liquid is called sublimation. | 11 |

298 | Which of the following carries anomalous expansion? A. Mercury B. water c. copper D. sodium | 11 |

299 | When heat energy is supplied to the substance, kinetic energy of its molecules: A. Increases B. Decreases c. Remains Same D. cannot be predicted | 11 |

300 | Which of the following is true regarding a bucket of boiling water and a cup of boiling water. I.The temperature of the two is the same. II.The heat content of the two is the | 11 |

301 | A body cools down from ( 80^{circ} mathrm{C} ) to ( 60^{circ} mathrm{C} ) in 10 Minutes when the temperature of surrounding is ( 30^{circ} mathrm{C} ). The temperature of the body after next 10 minutes will be: A ( cdot 30^{circ} mathrm{C} ) B . ( 48^{circ} mathrm{C} ) ( mathbf{c} cdot 50^{circ} C ) D. ( 52^{circ} mathrm{C} ) | 11 |

302 | The body temperature of a patient in ( 104^{circ} F . ) Calculate his body temperature in celsius scale. | 11 |

303 | The latent heat of vaporization is than the latent heat of fusion. Fill in the gap. A. Greater B. Smaller c. same D. None | 11 |

304 | The combustion of candles, containing paraffin wax, to carbon dioxide and water vapour is sublimation. A. True B. False | 11 |

305 | What is the amount of heat required to heat ( 1 mathrm{kg} ) of ice from ( -10^{circ} mathrm{C} ) to ( 0^{circ} mathrm{C} ? ) | 11 |

306 | Ocean currents are caused by the setting up of in water A. convection current B. heat current c. electric current D. wave current | 11 |

307 | A steel rod is clamped at its two ends and rests on a fixed horizontal base. The rod is in natural length at ( 20^{circ} mathrm{C} ). Find the longitudinal strain developed in the rod if the temperature rises to ( 50^{circ} mathrm{C} ) Coefficient of linear expansion of steel ( =1.2 times 10^{-6} /^{circ} mathrm{C} ) A ( .3 .6 times 10^{-4} ) B . ( 3.6 times 10^{-5} ) ( mathbf{c} cdot 6 times 10^{-4} ) D. ( 2.4 times 10^{-5} ) | 11 |

308 | Mothballs and camphor are examples of: A. sublimation B. liquation c. vaporisation D. solidification | 11 |

309 | Certain substance emits only the wavelengths, ( lambda_{1}, lambda_{2}, lambda_{3} ) and ( lambda_{4} ) when it is at a high temperature. When this substance is at a colder temperature, it will absorb only the following wavelengths: ( A cdot lambda_{1} ) B. ( lambda_{2} ) ( c cdot lambda_{1} ) and ( lambda_{2} ) D. ( lambda_{1}, lambda_{2}, lambda_{3} ) and ( lambda_{4} ) | 11 |

310 | Sea and land breezes are caused because of : A. convection B. cyclones c. rains D. conduction | 11 |

311 | Assertion A hollow metallic closed container maintained at a uniform temperature can act as a source of a black body radiation. Reason All metals act as a black body. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. If Assertion is incorrect but Reason is correct | 11 |

312 | When a metal rod is heated it expands because A. The size of its atoms increases B. The distance among its atoms increases C. Atmospheric air rushes into it D. The actual cause is still unknown | 11 |

313 | The ratio of wavelength corresponding to maximum emission of radiation 1: 195. The ratio of their temperature will be ( mathbf{A} cdot(195)^{2}: 1 ) B. 1: 195 ( mathbf{c} cdot(195)^{4}: 1 ) D. 195: 1 | 11 |

314 | Which of the following qualities are best suited for handling a cooking utensil? A. high specific heat and low thermal conductivity B. high specific heat and high thermal conductivity c. low specific heat and low thermal conductivity D. low specific heat and high thermal conductivity | 11 |

315 | The ( S . I . ) unit of heat capacity is A. ( J-k g^{-1} ) B . ( J K^{-1} ) c. ( J-k g^{-1} K^{-1} ) D. ( c a l^{o} C^{-} ) | 11 |

316 | Surface expansion is seen most commonly in: A. Plate B. Sphere c. Thin rod D. All | 11 |

317 | One half of slab of ice is covered with black cloth and the other half with white cloth. This is then placed in sunlight. After some time the pieces of cloth are removed. Then A. ice has melted equally under both the pieces. B. more ice has melted under white cloth c. more ice has melted under black cloth. D. it will depend on the medium in which ice is placed | 11 |

318 | State True or False. Heat travels much faster in insulators than in conductors. | 11 |

319 | Absolute zero is obtained from A . ( P-V ) graph B. ( P-frac{1}{V} ) graph c. ( P-T ) graph D. ( V-T ) graph | 11 |

320 | State : True or False The thermal capacity of a substance is fixed quantity, but its specific heat capacity is a variable quantity. | 11 |

321 | Newton’s law of cooling is a special case of A. Kirchoffs law B. Weins law c. Stefan-Boltzmanns law D. Plancks law | 11 |

322 | Two glass tumblers have been stuck together (one into the other). They can be seperated by A. Placing hot water in the inner tumbler B. Placing the tumblers in cold water c. Placing the outer tumbler in hot water D. Hamming them vigorously | 11 |

323 | Steam is passed into 22 gm of water at ( 20^{circ} mathrm{C} . ) The mass of water that will be present when the water acquires a temperature of ( 90^{circ} mathrm{C} ) (Latent heat of steam is 540 cal/g j is A. ( 24.83 mathrm{gm} ) B. 24 gm c. ( 36.6 mathrm{gm} ) D. 30 gm | 11 |

324 | and sublimatory substances | 11 |

325 | A pendulum clock is 5 sec fast at temperature of ( 15^{circ} mathrm{C} ) and 10 sec slow at a temperature of ( 30^{circ} mathrm{C} ). At temperature does it give the correct time- A ( cdot 18^{circ} mathrm{C} ) B . ( 20^{circ} mathrm{C} ) c. ( 22.5^{circ} mathrm{C} ) D. ( 25^{circ} mathrm{C} ) | 11 |

326 | Heat is not transferred by the process of convection in: A. solid B. liquid c. gas D. none of the above | 11 |

327 | The absolute temperature of a body ( A ) is four times that of another body ( B ). For two bodies, the difference in wave lengths at which energy radiated is maximum is ( 3.0 mu ) m. Then the wavelength at which the body ( B ) radiates maximum energy in micrometre is : A .2 B . 2. c. 4.0 D. 4.5 | 11 |

328 | There is some change in length when a 33000N tensile force is applied on a steel rod of the area of cross section ( mathbf{1 0}^{-3} mathbf{m}^{2} . ) The change in temperature required to produce the same elongation if the steel rod is heated is: (The modulus of elasticity is ( 3 x ) ( 10^{11} N m^{-2} ) and coefficient of linear expansion of steel is ( 1.1 times 10^{-5} 0 C^{-1} ) ) A ( cdot 20^{circ} ) В. ( 15^{circ} mathrm{C} ) ( mathrm{c} cdot_{10^{0}} mathrm{C} ) D. ( 0^{0} C ) | 11 |

329 | A heating coil is dipped in a bucket filled with water. Explain the significant mechanisms in heat flow. A. Heat from coil is transferred by conduction to both water and bucket B. Heat from coil is transferred by convection to both water and bucket c. Heat from coil is transferred by conduction to water. In water, heat flow occurs by convection and bucket gains heat from water by conduction D. None of the above | 11 |

330 | The expansion of an ideal gas of mass ( mathrm{m} ) at a constant pressure ( mathrm{P} ) is given by the straight line B. Then, the expanasion of the same ideal gas of mass ( 2 mathrm{m} ) at a pressure ( 2 P ) is given by the straight line A. B. A ( c cdot B ) D. data insufficient | 11 |

331 | Two electric lamps ( A ) and ( B ) radiate the same power. Their filaments have the same dimensions, and have emissivities ( e_{A} ) and ( e_{B} . ) Their surface temperatures are ( boldsymbol{T}_{boldsymbol{A}} ) and ( boldsymbol{T}_{boldsymbol{B}} ). The ratio ( frac{boldsymbol{T}_{boldsymbol{A}}}{boldsymbol{T}_{boldsymbol{B}}} ) will be equal to ( ^{mathbf{A}} cdotleft(frac{e_{B}}{e_{A}}right)^{1 / 4} ) ( ^{mathrm{B}} cdotleft(frac{e_{B}}{e_{A}}right)^{1 / 2} ) ( ^{mathbf{c}}left(frac{e_{A}}{e_{B}}right)^{1 / 2} ) ( ^{mathrm{D}} cdotleft(frac{e_{A}}{e_{B}}right)^{1 / 4} ) | 11 |

332 | The amount of thermal energy required to cause a liquid to freeze or a solid to melt is known as: A. Latent heat of fusion B. Latent heat of vaporization c. Latent heat of condensation D. Heat of fission | 11 |

333 | The water can be made to boil even at 0 if the pressure of surrounding is: ( A .56 mathrm{cm} ) of ( mathrm{Hg} ) B. ( 5 mathrm{cm} ) of ( mathrm{Hg} ) c. ( 0.1 mathrm{cm} ) of ( mathrm{Hg} ) D. ( 4.6 mathrm{mm} ) of ( mathrm{Hg} ) | 11 |

334 | the thermal capacity of 40 g of aluminium ( left(text {specific } quad text {heat}=frac{0.2 c a l}{g m times C}right) ) is A. ( 40 mathrm{cal} / C ) B. 160cal/C c. 200 cal ( / C ) D. 8cal/C | 11 |

335 | The rate of emission of radiation of a black body at ( 273^{circ} mathrm{C} ) is ( E ), then the rate of emission of radiation of this body at ( 0^{circ} mathrm{C} ) will be A ( cdot frac{E}{16} ) в. ( frac{E}{4} ) c. ( frac{E}{8} ) D. 0 | 11 |

336 | The process used for the seperation of those solids which sublime on heating from non volatile solids is : A. Evaporation B. Distillation C. Filteration D. Sublimation | 11 |

337 | Molar heat capacity of water in equilibrium with ice at constant pressure is : A. zero B. inifinity c. ( 40.05 k J K^{-1} ) mol ( ^{-1} ) D. ( 75.48 k J K^{-1} m o l^{-1} ) | 11 |

338 | How much heat energy in Joules is necessary to raise the temperature of ( 5 k g ) of water from ( 20^{circ} ) to ( 100^{circ} ? ) A. ( 1672 K J ) в. ( 167200 J ) c. ( 16720 J ) D. ( 1672 J ) | 11 |

339 | Solar radiation emitted by the sun resembles that emitted by a black body at a temperature of 6000 K. Maximum intensity is emitted at a wavelength of about ( 4800 A^{circ} ). If the sun were to cool down from ( 6000 K ) to ( 3000 K ), then the peak intensity would occur at a wavelength of: A .4800 A B. 96000 ( ^{text {? }} ) c. ( 2400 A^{circ} ) D. 19200 A | 11 |

340 | How much ice must be added to 100 g water at 30 Celsius in order to reduce its temperature to 20 Celsius? ( A cdot 108 ) B. 80g c. ( 400 mathrm{g} ) D. None of these | 11 |

341 | Write any 2 properties of thermal radiations? | 11 |

342 | A plane lamina has an area ( 2 m^{2} ) at ( 10^{circ} C ) then what is its area at ( 110^{circ} C ? ) It’s co-efficient of superficial expansion is ( 2 times 10^{-5} / C ) A ( .2 .002 mathrm{m}^{2} ) B . ( 2.004 mathrm{m}^{2} ) c. ( 2.02 m^{2} ) D. ( 2.04 mathrm{m}^{2} ) | 11 |

343 | A substance of mass ( m_{1} ) with specific heat capacity ( s_{1} ) and initial temperature ( theta_{1} ) is mixed with another substance of mass ( m_{2}, ) specific heat capacity ( s_{2} ) and initial temperature ( theta_{2} ) respectively. Then, their equilibrium temperature is ( left.ldots ldots text { (take } boldsymbol{theta}_{1}>boldsymbol{theta}_{2}right) ) A ( cdot frac{m_{1} s_{1} theta_{1}-m_{2} s_{2} theta_{2}}{m_{1} s_{1}-m_{2} s_{2}} ) В ( cdot frac{m_{1} s_{1} theta_{1}-m_{2} s_{2} theta_{2}}{m_{1} s_{1}+m_{2} s_{2}} ) c. ( frac{m_{2} s_{2} theta_{2}-m_{1} s_{1} theta_{1}}{m_{1}+m_{2}} ) D. ( frac{m_{1} s_{1} theta_{1}+m_{2} s_{2} theta_{2}}{m_{1} s_{1}+m_{2} s_{2}} ) | 11 |

344 | Water evaporates under atmospheric pressure. Without changing the temperature, the same water is placed in a partial vacuum. The rate of evaporation will ( A ). increase B. drop to zero c. decrease D. remain unaffected | 11 |

345 | The quantity of heat required to raise the temperature of unit mass of a given body through ( 1^{circ} C ) is known as specific heat. A. True B. False | 11 |

346 | A solid material is supplied with heat at a constant rate. The temperature of the material is changing with heat input as shown in the figure. What does slope DE represent? A. latent heat of liquid B. latent heat of vapour c. heat capacity of vapour D. inverse of heat capacity of vapour | 11 |

347 | A thermally insulated vessel contains some water at ( 0^{circ} mathrm{C} ). The vessel is connected to a vacuum pump to pump out water vapour. This results in some water getting frozen. It is given Latent heat of vaporization of water at ( 0^{circ} C= ) ( 21 times 10^{5} J / k g ) and latent heat of freezing water ( =mathbf{3 . 3 6} times mathbf{1 0}^{mathbf{5}} mathbf{J} / mathbf{k g} . ) The maximum percentage amount of water that will be solidified in this manner will be A. ( 86.2 % ) B . ( 33.6 % ) c. ( 21 % ) D. ( 24.36 % ) | 11 |

348 | toppr Q Type your question Thumbtacks were fixed with wax on each material and then the materials were fixed to a trough containing hot water as shown in the diagram. Vijay tabulated his results as shown here. Time taken for thumbtacks to Material drop(minutes) 5 0 6 2 What can be inferred from his experiment? A. Material R is a better conductor of heat than material ( S ) B. Material S is a better conductor of heat than material ( mathrm{R} ) C. Material Q is a better conductor of heat than material ( P ) D. Materials ( mathrm{P}, mathrm{Q}, mathrm{R} ) and ( mathrm{S} ) are equally good conductors of heat. | 11 |

349 | The direction shown in figure of convection current is correct. A. The direction in warmer water is correct but in cooler water is incorrect B. The direction in warmer water is incorrect but in cooler water is correct C. Both the direction in warmer water and in cooler water are correct D. None of the above | 11 |

350 | A gas at temperature ( 27^{circ} mathrm{C} ) and pressure 30 atmospheres is allowed to expand to one atmospheric pressure. If the volume becomes 10 times its initial volumes, the final temperature becomes: ( A cdot 100^{circ} mathrm{C} ) в. з7з к c. ( 373^{circ} mathrm{C} ) D. ( -173^{circ} mathrm{C} ) | 11 |

351 | The rate of cooling of a body is : A. independent of the nature of the surface of the body B. independent of the area of the body C. dependent on the excess of temperature of the body above that of the surroundings D. independent of the temperature of the surroundings | 11 |

352 | Assertion (A): Two metallic spheres of same size, one of copper and other of aluminium heated to the same temperatures, will cool at the same rate when they are suspended in the same enclosure. Reason (R): The rate of cooling of a body is directly proportional to the excess of temperature of the body over the surroundings. A. both ( A ) and ( R ) are true and the ( R ) is correct explanation of the A B. both A and R are true, but R is not correct explanation of the A C. A is true, but the R is false. D. A is false, but the R is true. | 11 |

353 | Give examples for the following processes. (i) Condensation (ii) Evaporation (iii) Transfer of heat (iv) Sublimation | 11 |

354 | A temperature difference of ( 27^{circ} mathrm{C} ) on the Kelvin scale is equal to a difference of : ( mathbf{A} cdot 27 K ) B . ( 300 K ) c. -246K-246K D. zero | 11 |

355 | In joly’s differential steam calorimeter, 3 g of an ideal gas is contained in a rigid closed sphere at 20 The sphere is heated by steam at 100 and it is found that an extra | 11 |

356 | The thermal conductivity of the plate depends upon A. the temperature difference between the two sides B. the thickness of the plate c. the area of the plate D. nature of the material | 11 |

357 | Steam at ( 100^{circ} mathrm{C} ) is passed into ( 1.1 mathrm{kg} ) of water contained in a calorimeter of water equivalent ( 0.02 mathrm{kg} ) at ( 15^{circ} mathrm{C} ) till the temperature of the calorimeter and its contents rises to ( 80^{circ} mathrm{C} ). The mass of the steam condensed in kilograms is A. 0.130 B. 0.065 c. 0.260 D. 0.135 | 11 |

358 | Describe an experiment to demonstrate that copper is a better conductor of heat than wood. | 11 |

359 | The following three objects (1) a metal tray, (2) a block of wood, and (3) a wooden cap are left in a closed room overnight. Next day the temperature of each is recorded as ( T_{1}, T_{2}, ) and ( T_{3} ) respectively. The likely situation is : A. ( T_{1}=T_{2}=T_{3} ) в. ( T_{3}>T_{2}>T_{1} ) c. ( T_{3}=T_{2}>T_{1} ) D. ( T_{3}>T_{2}=T_{1} ) | 11 |

360 | We consider the radiation emitted by the human body, which of the following statements is true? A. The radiation is emitted only during the day. B. The radiation is emitted during the summers and absorbed during the winters C. The radiation emitted lies in the ultraviolet region and hence is not visible D. The radiation emitted is in the infrared region | 11 |

361 | The temperature to which a gas must be cooled before it can be liquefied by pressure alone is called its A. Critical temperature B. Saturation point c. Boiling point D. Freezing point | 11 |

362 | Which of the following is a wrong pair of clothes worn during a particular season ? A. cotton clothes during summer B. Woolen clothes during winter c. Dark colored clothes during summer D. Polyester raincoats during Rainy season | 11 |

363 | Assertion Perspiration fro human body helps in cooling the body. Reason A thin layer of water on the skin enhances its emissivity. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

364 | A metal rod having ( boldsymbol{alpha}=mathbf{1 0} times mathbf{1 0}^{-mathbf{6}} /^{circ} boldsymbol{C} ) has a length of ( 250 mathrm{cm} ) at ( 40^{circ} mathrm{C} ). The temperature at which it can be shortened by ( 1 mathrm{mm} ) ( mathbf{A} cdot 80^{circ} mathrm{C} ) в. ( -40^{circ} mathrm{C} ) ( mathbf{c} cdot 0^{circ} C ) D. ( 40^{circ} mathrm{C} ) | 11 |

365 | The diameter of a solid metallic sphere is equal to the inner diameter of a hollow metallic sphere. If inner diameter of hollow sphere is two thirds of its outer diameter. Both the spheres are made of same metal. If an equal amount of heat is supplied the both the spheres. Find the ratio of increase in temperature of the solid sphere to that of the hollow one? | 11 |

366 | If the largest cube that can be carved out from a gold sphere has a thermal capacity of ‘K’ units, what would be the thermal capacity of the sphere? | 11 |

367 | Calorimeters are generally made of A. copper B. brass c. aluminium D. zinc | 11 |

368 | Two copper spheres, one of large size and the other small, are heated to the same temperature. Which will cool first?? A . bigger B. smaller c. both in equal time D. insufficient data to reply | 11 |

369 | State two differences between the specific heat capacity and the heat capacity of a substance. | 11 |

370 | Explain how heat losses due to conduction, convection and radiation are minimized in a Thermos Flask. | 11 |

371 | A sphere ( P(text { emissivity }=1 ) ) of radius ( 2 R ) and and another sphere ( Q ) (emissivity ( =1 / 2 ) ) of radius ( R ) are placed in vacuum at some distance. There are no other objects. The temperature of the sphere ( Q ) is maintained at ( 200 K ) by the means of a heater. A fraction ( 1 / 32 ) of the power emitted by the sphere ( Q ) falls on the sphere ( P ). If the equilibrium temperature of the sphere ( boldsymbol{P} ) is ( 10 boldsymbol{T} ) (in ( K ) ), find the value of ( T: ) | 11 |

372 | The amount of heat required to convert 1 g of ice (specific 0.5 cal at ( g^{-1 o} C^{-1} ) ) at ( -10^{0} C ) to steam at ( 100^{circ} mathrm{C} ) is Given: Latent heat of ice is ( 80 mathrm{Cal} / mathrm{gm} ) Latent heat of steam is ( 540 mathrm{Cal} / mathrm{gm} ) Specific heat of water is ( 1 C a l / g m / C] ) A . 725 cal B. 636 cal c. 716 cal D. None of these | 11 |

373 | The temperature of liquid hydrogen is 20 ( K ).What is this temperature on the Fahrenheit scale? A ( cdot 495.4^{circ} mathrm{F} ) B. ( -423.4^{circ} mathrm{F} ) c. ( -108.56^{circ} mathrm{F} ) D . ( -487.4^{circ} mathrm{F} ) | 11 |

374 | A calorimeter contains ( 400 g ) of water at a temperature of ( 5^{circ} mathrm{C} ). Then, ( 200 g ) of water at a temperature of ( +10^{circ} mathrm{C} ) and ( 400 g ) of ice at a temperature of ( -60^{circ} mathrm{C} ) are added. What is the final temperature(in ( ^{o} C ) ) of the contents of the calorimeter? Specific heat capacity of water ( =mathbf{1 0 0 0} ) cal / kg/K. Specific latent heat of fusion of ice ( =mathbf{8 0} times ) 1000 cal / kg. Relative specific heat of ice ( =mathbf{0 . 5} ) | 11 |

375 | Give reasons. (a) After a hot sunny day, we sprinkle water on the roof or open ground. (b) Perspiration keeps our body cold. (c) Ice is rubbed on burnt part of the skin | 11 |

376 | What is the rate of change of capacitance with temperature if the capacity of capacitor is ( mathrm{C} ) ? ( A cdot Cleft(2 alpha_{1}-alpha_{2}right) ) B. ( cleft(alpha_{1}-alpha_{2}right) ) ( c cdot cleft(alpha_{1}-2 alpha_{2}right) ) D. ( frac{Cleft(alpha_{1}-alpha_{2}right)}{2} ) | 11 |

377 | Describe an experiment to compare the thermal conductivities of different metals. | 11 |

378 | The moving air from the hair dryer removes the molecules of liquids as soon as they escape from the surface of your hair. Which factor of evaporation is responsible for the above example? A. Temperature B. Motion of air c. Nature of liquid D. Humidity of surrounding | 11 |

379 | A very small hole in an electrical furnace used for treating metal acts nearly as black body. If the hole has an area ( 100 m m^{2} ) and it is desired to maintain the metal at ( 727^{circ} C ), then how much power travels through the hole? A. zero B. 5.7 ( w ) c. ( 57 mathrm{w} ) D. 57 kw | 11 |

380 | In specific heat of a substance is infinite, it means A. Heat is given out B. Heat is taken out C. No change in temperature takes place whether heat is taken in or given out D. All of the above | 11 |

381 | Latent heat depends on the mass of the substances. A . True B. False | 11 |

382 | The material that has largest specific heat is : A. mercury B. water c. iron D. diamond | 11 |

383 | What is the correct term for the phase change from solid directly to gas? A. Deposition B. Sublimation c. Liquefaction D. Fusion | 11 |

384 | How much heat is required to raise 1 gram of copper at ( 1^{prime} mathrm{C} ? ) A. 0.385 Joules B. 0.485 Joules c. 1.02 Joules D. 2.045 Joules | 11 |

385 | The normal boiling point of liquid hydrogen is ( -253^{circ} mathrm{C} ). What is the corresponding temperature on absolute scale? A . ( 22 K ) в. ( 20 K ) c. ( 274 K ) D. ( -20 K ) | 11 |

386 | You work is a material testing lab and your bess tells you to increase the temperature of a sample by ( 40.0^{circ} mathrm{C} ) The only thermometer you can find at your workbench reads in ( ^{circ} boldsymbol{F} ). If The initial temperature of the sample is ( 68.2^{circ} F ) What is its temperature in ( ^{circ} boldsymbol{F} ), when the desired temperature increase has been achieved? | 11 |

387 | The amount of heat required to change 1 kg of ice to water without a change in temperature is known as: A. Specific latent heat of vaporisation B. Specific latent heat of fusion c. latent heat of vaporisation D. latent heat of fusion | 11 |

388 | Two identical containers each of volume ( V ) 0 are joined by a small pipe. The containers contain identical gases at temperature ( T_{0} ) and pressure ( P_{0} . ) One container is heated to temperature ( 2 mathrm{T}_{0} ) while maintaining the other at the same temperature. The common pressure of the gas is ( mathrm{P} ) and ( mathrm{n} ) is the number of moles of gas in container at temperature ( 2 T_{0} ) ( mathbf{A} cdot P=2 P_{0} ) в. ( quad P=frac{4}{3} P_{0} ) c. ( _{n}=frac{2 P_{0} V_{0}}{3 R T_{0}} ) D. ( n=frac{3 P_{0} V_{0}}{2 R T_{0}} ) | 11 |

389 | The quantity of heat required to raise the temperature of 2000 g of water from ( 10^{circ} mathrm{C} ) to ( 50^{circ} mathrm{C} ) is A. 80 cal B. 80,000 cal c. 8000 cal D. none of these | 11 |

390 | ( 19 g ) of water at 30 and ( 5 g ) of ice at ( -20 C ) are mixed together in a calorimeter. What is the final temperature of the mixture? (Given specific heat of ice ( =mathbf{0 . 5} )calg( ^{-1}()^{-1} ) and latent heat of fusion of ice ( = ) ( 80 c a l g^{-1} ) ( mathbf{A} cdot mathbf{0} ) B. -5 ( c .5 ) D. 10 | 11 |

391 | A cylindrical tube of uniform crosssectional area A is filled with two air tight frictionless pistons. The pistons are connected to each other by a metallic wire. Initially, the pressure of the gas is ( p_{o} ) and temperature is ( T_{o} ) atmospheric pressure is also ( p_{o} $ . ) Now, the temperature of the gas is increased to ( 2 T_{0}, ) the tension of wire will be. A ( cdot 2 p_{o} ) в. ( p_{o} A ) c. ( frac{p_{o} A}{2} ) D. ( 4 p_{o} A ) | 11 |

392 | If the temperature of a gas is increased by ( 1 mathrm{K} ) at constant pressure, its volume increases by 0.0035 of the initial volume. The temperature of the gas is: ( A cdot 100 K ) B. 150 K c. ( 300 k ) D. 285.7 K | 11 |

393 | The process by which solid ( C O_{2} ) is directly converted to its gaseous form is called: A. Evaporation B. Decomposition c. Sublimation D. None of the above | 11 |

394 | The dimension of universal gas constant R are A ( cdot M^{2} L^{2} T^{-2} ) B. ( M L^{2} T^{-2} theta^{-1} ) ( mathbf{c} cdot M^{2} L^{2} T^{-2} theta^{-2} ) D. ( M L T^{-2} theta^{-2} ) | 11 |

395 | Which of the following properties must be known in order to calculate the amount of heat needed to melt ( 1.0 mathrm{kg} ) of ice at ( 0^{circ} C ? ) I. The specific heat of water I. The latent heat of fusion for water III. The density of water. A. I only B. I and II only c. ।, II, and III D. II only E. I and III only | 11 |

396 | 10 kg storage battery has an average specific heat of ( 0.2 mathrm{kcal} / mathrm{kg}^{circ} mathrm{C} ). When fully charged, the energy content of the battery is 1 kcal. If the entire energy were used to raise the temperature, then the temperature would increase by A. ( 0.2^{circ} mathrm{C} ) B. ( 0.5^{circ} mathrm{C} ) c. ( 200^{circ} mathrm{C} ) D. ( 20^{circ} mathrm{C} ) | 11 |

397 | A gas at a temperature of ( 27^{0} mathrm{C} ) is heated at a constant pressure to triple its volume. The final temperature of the gas will be: A ( cdot 27^{0} ) B . ( 627^{circ} mathrm{C} ) c. ( 627 mathrm{k} ) D. ( 900^{circ} mathrm{C} ) | 11 |

398 | Wien’s displacement law fails at: A. low temperature B. high temperature c. short wavelength D. Iong wavelength | 11 |

399 | Calculate the amount of heat required to convert 100 g of ice at ( 0^{circ} mathrm{C} ) into the water at ( 0^{circ} mathrm{C}: ) Given:Specific latent heat of fusion of ice ( =336 J / g ) A. 33600 B. 3360 J c. 67200 D. 6720 J | 11 |

400 | A steel rod of length ( 1 mathrm{m} ) is heated from ( 25^{circ} ) to ( 75^{circ} mathrm{C} ) keeping its length constant. The longitudinal strain developed in the rod is (Given coefficient of linear expansion of stee ( left.=12 times 10^{-6} /^{circ} Cright) ) A. ( 6 times 10^{-4} ) В. ( -6 times 10^{-5} ) c. ( -6 times 10^{-4} ) D. zero | 11 |

401 | Reverse process of sublimation is: A. fusion B. condensation c. deposition D. freezing | 11 |

402 | In an experiment a sphere of aluminium of mass ( 0.20 k g ) is heated upto ( 150^{circ} C ) Immediately, it is put into water of volume ( 150 c c ) at ( 27^{circ} C ) kept in a calorimeter of water equivalent of ( 0.025 k g . ) Final temperature of the system is ( 40^{circ} mathrm{C} ). The specific heat of aluminium is : (take 4.2 Joule ( =1 ) calorie) ( mathbf{A} cdot 434 J / k g-^{o} C ) B . ( 378 J / k g-^{o} C ) ( mathbf{c} cdot 476 J / k g-^{o} C ) D . ( 315 mathrm{J} / mathrm{kg}-^{circ} mathrm{C} ) | 11 |

403 | A graph is drawn between centigrade temperatures of body along x-axis and corresponding Fahrenheit temperatures along y-axis. Slope of the graph is A ( .5 / 9 ) B. 9/5 ( c cdot 4 / 5 ) D. ( 5 / 4 ) | 11 |

404 | Under some conditions, a material can be heated above or cooled below the normal phase change temperature without a phase change occurring. The resulting state : A. may be stable B. may be unstable c. must be stable D. must be unstable | 11 |

405 | An electric bulb of ( 250 c c ) was sealed off at a pressure ( 10^{-3} mathrm{mm} ) of ( mathrm{Hg} ) and temperature ( $ $ 27^{wedge}{0} $ $ ) C. The number of molecules present in the gas is A ( cdot 8.02 times 10^{15} ) В. ( 6.023 times 10^{23} ) c. ( 8.021 times 10^{23} ) D. ( 6 times 10^{22} ) | 11 |

406 | Absolute scale of temperature is known as (Celsius scale, Kelvin scale) | 11 |

407 | is the change of gaseous state directly to solid state without going through liquid the state. A. sublimation B. Precipitation c. Evaporation D. freezing | 11 |

408 | The radius of a metal sphere at room temperature ( boldsymbol{T} ) is ( boldsymbol{R} ) and the coefficient of linear expansion is ( alpha . ) The sphere heated a little by a temperature ( triangle T . ) So that its new temperature is ( boldsymbol{T}+triangle boldsymbol{T} ) The increase in the volume of the sphere is approximate: ( mathbf{A} cdot 4 pi R^{3} alpha triangle T ) В ( cdot 2 pi R^{3} alpha triangle T ) ( mathbf{c} cdot pi R^{3} alpha Delta T ) D. ( 4 pi R^{3} alpha Delta T / 3 ) | 11 |

409 | The temperature of the substance remains constant when it is melting and boiling though some quantity of heat is supplied. What happens to this energy? A. It is dissipated as sound energy B. It is consumed to increase the energy of the molecules C. It is used to change the state of the substance D. It is still an unsolved problem in science | 11 |

410 | ( 50 g ) of ice at ( 0 mathrm{C} ) mixed with ( 50 g ) of water at 20 C. The final temperature of the mixture would be: A. -30 C B. -10 C ( c cdot 0 ) D. 10 C | 11 |

411 | The S.I. unit of specific heat capacity is : A. ( J k g^{-1} ) B. ( J K^{-1} ) c. ( J k g^{-1} K^{-1} ) D. ( k c a l k g^{-1} circ C^{-1} ) | 11 |

412 | Thermal radiations are similar to A . ( alpha ) rays B. X-rays c. cathode rays D. none of these | 11 |

413 | A calorimeter of water equivalent 6 g has water of mass 64 gup to a certain volume. Another identical calorimeter has liquid of mass 50 g and specific heat ( 0.6 mathrm{cal} / mathrm{g}^{-0} mathrm{C} ) up to same level. If both of them cool in the same surroundings through same range of temperature and the time taken for the water to cool is 140 s, then the time taken for the liquid to cool will be : A. 72 s B. 140 s ( c cdot 36 s ) D. 120 | 11 |

414 | Which of the following will respond to sublimation? 1.Sodium chloride 2. Dry ice 3. Naphthalene 4. Ammonium chloride A. 1,2 and 3 B. 1,3 and 4 ( c cdot 3 ) and 4 D. 2, 3 and 4 | 11 |

415 | Heat energy required of melt ( 1 g ) of ice to ( 1 g ) of water at ( 0^{0} C ) is : | 11 |

416 | The variation of lengths of two metal rods ( A ) and ( B ) with change in temperature are shown in figure. The coefficients of linear expansion ( boldsymbol{alpha}_{boldsymbol{A}} ) for the metal ( A ) and the temperature ( T ) will be : (Given ( left.alpha_{B}=9 times 10^{-6} /^{circ} mathrm{C}right) ) ( mathbf{A} cdot alpha_{A}=3 times 10^{-6} /^{circ} mathrm{C}, 500^{circ} mathrm{C} ) B . ( alpha_{A}=3 times 10^{-6} /^{circ} mathrm{C}, 222.22^{circ} mathrm{C} ) C ( cdot alpha_{A}=27 times 10^{-6} /^{circ} mathrm{C}, 500^{circ} mathrm{C} ) D. ( alpha_{A}=27 times 10^{-6} /^{circ} mathrm{C}, 222.22^{circ} mathrm{C} ) | 11 |

417 | Assertion: V-t graph for gas at constant pressure is a straight line passing through origin (t-temperature in Celsius) Reason: volume is directly proportional to temperature (kelvin) at constant pressure. ( A ). Both assertion (A) and reason (R) are correct and gives the correct explanation B. Both assertion (A) and reason (R) are correct but ( R ) doesnt give the correct explanation c. A is true but R is false D. A is false but R is true | 11 |

418 | (i) Water in lakes and ponds do not freeze at once in cold countries. Give a reason in support of your answer. (iii) What is the principle of Calorimetry? (iiii) Name the law on which this principle is based. ( (i v) ) State the effect of an increase of impurities on the melting point of ice. | 11 |

419 | The value of absolute zero temperature in Fahrenheit scale is ( mathbf{A} cdot-273^{circ} F ) B. ( -32^{circ} F ) c. ( -460^{circ} F ) D. ( -132^{circ} F ) | 11 |

420 | Three rods of equal lengths are joined to form an equilateral triangle ( A B C ). D is the of AB. The coefficient of linear expansion is ( alpha_{1} ) for material of ( operatorname{rod} A B ) and ( alpha_{2} ) for ( n ) rods ( A C ) and ( B C ). It the distance DC remains constant for small changes in temperature. | 11 |

421 | The resistance of the wire made of silver at ( 27^{circ} C ) temperature is equal to ( 2.1 Omega ) While at ( 100^{circ} mathrm{C} ) it is ( 2.7 Omega ). Calculate the temperature coefficient of the resistivity of the silver.Take the reference temperature is equal to ( 20^{circ} C ) | 11 |

422 | M g of ice at ( 0^{circ} mathrm{C} ) is to be converted to water at ( 0^{circ} mathrm{C} ). If ( mathrm{L} ) is the latent heat of fusion of ice, the quantity of heat required for the above operation would be: A . ( M L ) cal в. ( frac{M^{2}}{L} ) ( ^{mathrm{c}} cdot frac{M}{L} mathrm{cal} ) D. none of these | 11 |

423 | A sphere, a cube and a thin circular plate have the same mass and are made of the same material. All of them are heated to the same temperature. The rate of cooling is A. The maximum for the sphere and minimum for the plate B. The maximum for the sphere and minimum for the cube (a) and (b) c. Both D. None of the above | 11 |

424 | A piece of copper weighing 500 g is heated to ( 100^{circ} mathrm{C} ) and dropped into ( 200 mathrm{g} ) of water at ( 25^{circ} mathrm{C} ). Find the temperature of the mixture. The specific heat of Cu is ( 0.42 J g^{-1} o C^{-1} ) A ( cdot 30^{circ} mathrm{C} ) B . ( 40^{circ} mathrm{C} ) ( mathbf{c} cdot 50^{circ} C ) D. ( 60^{circ} mathrm{C} ) | 11 |

425 | ( 660 J ) heat energy is supplied to a solid of mass ( 275 g . ) When its temperature rises by ( 1^{circ} mathrm{C} ), calculate specific heat capacity of the solid: A ( cdot 1.2 J / g^{o} C ) в. ( 4.8 mathrm{J} / mathrm{g}^{circ} mathrm{C} ) c ( cdot 2.4 J / g^{circ} C ) D. ( 9.6 J / g^{o} C ) | 11 |

426 | How much heat energy is gained when 5 kg of water at ( 20^{circ} mathrm{C} ) is brought to its boiling point? A . 1680 K в. 1700 кл c. 1720 KJ D. 1740 KJ | 11 |

427 | Explain why a body with large reflectivity is a poor emitter. | 11 |

428 | An iron ball at ( 40^{circ} mathrm{C} ) is dropped in a mug containing water at ( 40^{circ} mathrm{C} ) The heat will A. flow from iron ball to water B. not flow from iron ball to water or from water to iron ball c. flow from water to iron ball. D. increase the temperature of both | 11 |

429 | ( 45 g ) of water at ( 50^{circ} C ) in a beaker is cooled when ( 50 g ) of copper at ( 18^{circ} C ) is added to it. The contents are stirred till final constant temperature is reached. Calculate the final temperature. The specific heat capacity of copper is ( 0.39 J g^{-1} K^{-1} ) and that of water is ( 4.2 J g^{-1} K^{-1} . ) State the assumption used. | 11 |

430 | The rectangular surface of area ( 8 mathrm{cm} times ) ( 4 c m ) of a block body at a temperature of ( 127^{circ} C ) emits energy at the rate of ( E ) per second. If the length and breath of the surface are each reduced to half of the initial value and the temperature is raised to ( 327^{circ} mathrm{C} ), the rate of emission of energy will become ( ^{mathbf{A}} cdot frac{3}{8}^{E} ) B ( cdot frac{81}{16} E ) c. ( frac{9}{16} E ) D. ( frac{81}{64} ) | 11 |

431 | A hot and a cold body are kept in vacuum separated from each other. Which of the following causes decrease in temperature of the hot body? A. Radiation B. Convection c. conduction D. Temperature remains unchanged | 11 |

432 | Kelvin scale has A. one fixed point B. two fixed point C. three fixed point D. one fixed point and two variable points | 11 |

433 | The S.I. unit of universal gas constant is A. ( W a t t K^{-1} m o l^{-1} ) B. ( N K^{-1} ) mol ( ^{-1} ) c. ( J K^{-1} m o l^{-1} ) D. ( operatorname{erg} K^{-1} )mol( ^{-1} ) | 11 |

434 | How much heat would be required to convert ( 14 mathrm{kg} ) of ice at ( 0^{circ} mathrm{C} ) into water of ( 0^{circ} mathrm{C} ? ) A . 4704 J в. 4704 k c. 336 J D. 336 kJ | 11 |

435 | ( 10 k g ) of hot water in a bucket at ( 70^{circ} mathrm{C} ) is cooled for taking a bath adding to it ( 20 k g ) water at ( 20^{circ} C . ) What is the temperature of the mixture? (Neglect the thermal capacity of the bucket) A ( cdot 30.67^{circ} mathrm{C} ) в. ( 36.67^{circ} mathrm{C} ) ( c cdot 60.67^{circ} C ) D. ( 46.67^{circ} mathrm{C} ) | 11 |

436 | Three rods of identical cross-sectional area are made from the same metal and form the sides of an isosceles triangle ( A B C, ) right-angled at ( B . ) The points ( A ) and ( B ) are maintained at temperatures ( T ) and ( (sqrt{2}) T, ) respectively. In the steady state, the temperature of the point is ( T_{c} ) Assuming that only heat conduction takes place, ( boldsymbol{T}_{c} / boldsymbol{T} ) is ( ^{A} cdot frac{1}{2(sqrt{2}-1)} ) в. ( frac{3}{sqrt{2}+1} ) c. ( frac{1}{sqrt{3}(sqrt{2}-1)} ) D. ( frac{1}{sqrt{2}+1} ) | 11 |

437 | Among the following which is having maximum specific heat. A . Ice B. water c. Steam D. Alcohol | 11 |

438 | The temperature of water at the surface of a deep lake is ( 2^{0} ) C. The temperature expected at the bottom is A ( cdot 0^{0} mathrm{C} ) B . ( 2^{0} ) C c. ( 4^{circ} ) с D. ( 6^{circ} mathrm{c} ) | 11 |

439 | Which of the following shows sublimation at room temperature? A. water B. oil c. Ammonium chloride D. sodium carbonate | 11 |

440 | The temperature of liquid hydrogen is 20 K. What is this temperature on the Fahrenheit scale? A ( cdot 495.4^{circ} mathrm{F} ) B . ( -423.4^{circ} F ) c ( .-108.56^{circ} mathrm{F} ) D. ( -487.4^{circ} F ) | 11 |

441 | Consider the following statements. A. The coefficient of linear expansion has dimension ( K^{-1} ) B. The coefficient of volume expansion has dimension ( K^{1} ) C. ( A ) and ( B ) are both correct. D. A is correct but B is wrong. | 11 |

442 | A black body emits heat at the rate of 20 W. When its temperature is 227 ( ^{circ} mathrm{C} ) Another black body emits heat at the rate of ( 15 mathrm{W} ), when its temperature is 277 ( ^{o} mathrm{C} . ) Compare the area of the surface of the two bodies, if the surrounding is at NTP : A . 16: 1 B. 1: 4 ( c cdot 12: 1 ) D. 1:12 | 11 |

443 | f an annular disc of radii ( r_{1} ) and ( r_{2} ) is heated, then A ( cdot r_{1} ) increases, ( r_{2} ) decreases B. ( r_{2} ) increases, ( r_{1} ) decreases ( c cdot operatorname{both} r_{1} ) and ( r_{2} ) increase ( mathrm{D} cdot r_{2} ) increases, ( r_{1} ) remains unchanged | 11 |

444 | The amount of heat required to convert 1 g of ice at ( -10^{0} C ) into steam at ( 100^{0} C ) is (approximately): (specific heat of water ( =4.187 mathrm{J} / mathrm{g}^{0} mathrm{C}, ) latent heat of fusion ( =334 ) J/g , latent heat of vaporization ( =2260 ) J/g, specific heat of ice ( =mathbf{2 . 0 3} mathrm{J} / mathrm{g} ) ): A . 3034 J B. 735 J c. 1000 D. 4200 J | 11 |

445 | At pressure ( P ) and absolute temperature T a mass ( mathrm{M} ) of an ideal gas fills a closed container of volume ( V ). An additional mass ( 2 mathrm{M} ) of the same gas is added into the container and the volume is then reduced to ( frac{v}{3} ) and the temperature to ( frac{T}{3} ) The pressure of the gas will now be: A ( cdot frac{P}{3} ) в. ( P ) ( c .3 P ) D. ( 9 P ) | 11 |

446 | The graph is shown in the figure is a plot of the temperature of the body in ( ^{o} C ) and ( ^{o} F . ) The value of ( sin theta ) is 4 ( overline{mathrm{q}} ) B. ( frac{5}{sqrt{86}} ) c. ( frac{9}{sqrt{86}} ) D. ( frac{5}{sqrt{106}} ) | 11 |

447 | How will you demonstrate the thermal expansion in a liquid? Describe an experiment. | 11 |

448 | An ideal gas can be expanded from an initial state to a certain volume through two different processes (i) ( P V^{2}= ) constant and ( (i i) P=K V^{2} ) where ( K ) is a positive constant. Based on the given situation, choose the correct statements This question has multiple correct options A. Final temperature in (ii) will be greater than in (i) B. Final temperature in (ii) will be less than in (i) c. Total heat given to the gas in case (ii) is greater than in (i) D. Total heat given to the gas in case (ii) is less than in (i) | 11 |

449 | The S.I. unit of specific heat capacity is ( J k g^{-1} o C^{-1} ) A. True B. False | 11 |

450 | According to Charles law, A. At constant pressure, volume of gas is proportional to its absolute temperature. B. At constant pressure, the volume of a gas is not proportional to its absolute temperature. C. At constant gauge pressure, the molecular volume of a gas is proportional to its absolute temperature. D. At constant volume, the absolute pressure is proportional to absolute temperature. | 11 |

451 | The dimensional formula for coefficient of thermal conductivity is: ( mathbf{A} cdot[M L T K] ) B . ( left[M L T K^{-1}right] ) c. ( left[M L T^{-1} K^{-1}right] ) D cdot ( left[M L T^{-3} k^{-1}right] ) | 11 |

452 | Look at the given figure and suggest in which of the vessels ( A, B, C ) or ( D ) the rate of evaporation will be the highest? Explain | 11 |

453 | According to Hess’s law, the thermal effects of a reaction depends on ( mathbf{A} cdot ) Initial and final conditions of the reacting substances B. Initial concentration of reactants C. Final conditions of the reacting substances D. Not on initial and final conditions of the reacting substance | 11 |

454 | The hot water pipes used to heat up the room are painted A. white B. yellow ( c cdot ) red D. black | 11 |

455 | Two rigid boxes containing different ideal gases are placed on a table. Box ( boldsymbol{A} ) contains one mole of nitrogen at temperature ( T_{o}, ) while box ( B ) contains one mole of helium at temperature ( (7 / 3) T_{0} . ) The boxes are then put into thermal contact with each other, and heat flows between them until the gases reach a common final temperature (Ignore the heat capacity of boxes).Then, the final temperature of ( operatorname{gases}, boldsymbol{T}_{f}, ) in the terms of ( boldsymbol{T}_{boldsymbol{o}} ) is: ( ^{mathbf{A}} cdot T_{f}=frac{3}{7} T_{0} ) ( ^{mathrm{B}} cdot_{T_{f}}=frac{7}{3} T_{0} ) ( ^{mathbf{C}} cdot_{T_{f}}=frac{3}{2} T_{0} ) ( ^{mathrm{D}} cdot_{T_{f}}=frac{5}{2} T_{0} ) | 11 |

456 | The heat capacity of a solid of mass 175 g is ( 315 J^{circ} C^{-1} ). Calculate specific heat capacity of solid. | 11 |

457 | A large steel wheel is to befitted on to a shaft of the same material. At ( 27^{circ} mathrm{C} ), the outer diameter of the shaft is ( 8.70 mathrm{cm} ) and the diameter of the central hole in the wheel is, ( 8.69 mathrm{cm} . ) The shaft is cooled using ‘dry ice’. At what temperature of the shaft does the whee slip on the shaft? Assume coefficient of linear expansion of the steel to be constant over the required temperature range ( boldsymbol{a}_{text {steel}}=mathbf{1 . 2 0} times mathbf{1 0}^{-mathbf{5}} mathbf{K}^{-mathbf{1}} ) | 11 |

458 | The given setup is the heating of ammonium chloride. While heating solid ammonium chloride, it converts into: A. solid B. liquid ( c cdot ) gas D. none of these | 11 |

459 | Choose the correct statements from the following This question has multiple correct options A. Evaporation takes place from the surface of a liquid at all temperatures. B. The rate of evaporation depends upon the area of the exposed surface of the liquid, nature of the liquid and its temperature. C. The rate of evaporation depends on the pressure to which the liquid is subjected. D. The cooling produced in evaporation is a consequence of the fact that a liquid has latent heat. | 11 |

460 | The wavelength of maximum energy released during an atomic explosion was ( 2.93 times 10^{-10} ) m. The maximum temperature attained must be: (Weins constant ( left.=2.93 times 10^{-3} m Kright) ) ( mathbf{A} cdot 5.86 times 10^{7} K ) B ( cdot 10^{-13} ) K c. ( 10^{-7} K ) ( mathbf{D} cdot 10^{7} K ) | 11 |

461 | Which one of the following sources of energy you recommend to use? A source of energy having an input energy Jand an output energy J. A . 1000,2000 B. 2000, 2500 c. 100.12500 D. 5000, 5250 | 11 |

462 | Heat causes- A. change in temperature B. chemical change C. biological change D. all of these | 11 |

463 | If pressure of a gas contained in a closed vessel is increased by ( 0.4 % ) when heated by ( 1^{0} C, ) the initial temperature must be A. 250K B ( cdot 250^{0} C ) c. 2500k D ( .25^{circ} mathrm{C} ) | 11 |

464 | The graph between two temperature scales ( A ) and ( B ) is shown in figure. Between upper fixed point and lower fixed point, there are 150 equal divisions on scale ( A ) and 100 on scale ( B ) The relationship for conversion between the two scales in given by: A ( cdot frac{t_{A}-180}{100}=frac{t_{B}}{150} ) в. ( frac{t_{A}-30}{150}=frac{t_{B}}{100} ) c. ( frac{t_{B}-180}{150}=frac{t_{A}}{100} ) D. ( frac{t_{B}-40}{100}=frac{t_{A}}{180} ) | 11 |

465 | Temperature of core of earth is equal to ( 3727^{0} C . ) This temperature in Kelvins is equal to: A . ( 4000 K ) в. ( 3727 K ) c. ( 3454 K ) D. none of the above | 11 |

466 | Two uniform rods of equal length ( left(l_{n}right) ) and equal mass have the coefficient of linear expansion ( alpha ) and ( 2 alpha ) are placed in contact on a smooth horizontal surface as shown in the figure. The temperature of the system is ( theta^{0} C . ) Now the temperature is increased by ( Delta theta^{0} C ).The junction of the rods will shift its initial position by: A ( cdot frac{l_{0} alpha Delta theta}{2} ) B. ( frac{l_{0} alpha Delta theta}{3} ) c. ( frac{l_{0} alpha Delta theta}{4} ) D | 11 |

467 | A graph is plotted taking ( ^{circ} boldsymbol{C} ) along the Y-axis and ( ^{circ} boldsymbol{F} ) along the ( mathbf{X} ) -axis. It is a/an A. parabola B. straight line c. ellipse D. circle | 11 |

468 | According to Newton’s Law of cooling, the rate of cooling of a body is proportional to ( (Delta theta)^{n}, ) where ( Delta theta ) is the difference of temperature of the body and the surrounding and ( n ) is equal to A .2 B. 3 ( c cdot 4 ) D. | 11 |

469 | Assertion The lowest attainable temperature is absolute zero,i.e.,0 ( K=-273.15^{circ} mathrm{C} ) Reason Size of each degree on Kelvin scale is same as that on Celsius scale. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

470 | For an ideal gas ( V ) -T curves at constant pressures ( P_{1} & P_{2} ) are shown in figure, from the figure A ( cdot P_{1}>P_{2} ) в. ( P_{1}<P_{2} ) ( c cdot P_{1}=P_{2} ) D. ( P_{1} leq P_{2} ) | 11 |

471 | Liquids generally have lower density as compared to solids but ice floats on water. Why? | 11 |

472 | Which among the following substances has the greatest specific heat? A. Iron B. Water c. copper D. Mercury | 11 |

473 | Absolute zero is ( mathbf{A} cdot-273^{circ} C ) в. ( -273^{circ} ) F ( mathbf{c} cdot-273^{circ} K ) D. None of these | 11 |

474 | A body was supplied 1000 kilocalories of heat. Express this heat in mega joules. A. 2.2 mega joules B. 3.2 mega joules c. 4.2 mega joules D. 5.2 mega joules | 11 |

475 | The unit calorie belongs to: A . heat B. temperature ( c . ) work D. coefficient of linear expansion | 11 |

476 | Ramesh is travelling from the Pacific Ocean towards Indian Ocean. In the Pacific Ocean he has a balloon with 2 litre capacity at ( 18^{0} ) C. When he reaches the Indian Ocean, the temperature will be ( 25^{0} ) C. What will be the volume of the balloon? | 11 |

477 | The length of the rod is ( 150 mathrm{cm} ) at ( 25^{circ} mathrm{C} ) Find its length when it is heated ( 150^{circ} mathrm{C} ) ( left(alpha operatorname{steel}=2.2 times 10^{-5} /^{o} Cright) ) | 11 |

478 | Equation of gas in terms of pressure ( p ) absolute temperature ( T ) and density ( d ) is : ( mathbf{A} cdot frac{p_{1}}{d_{1} T_{1}}=frac{p_{2}}{d_{2} T_{2}} ) В ( cdot frac{p_{1} T_{1}}{d_{1}}=frac{p_{2} T_{2}}{d_{2}} ) ( mathbf{c} cdot frac{p_{1} d_{2}}{T_{2}}=frac{p_{2} d_{1}}{T_{1}} ) D. ( frac{p_{1} d_{1}}{T_{1}}=frac{p_{2} d_{2}}{T_{2}} ) | 11 |

479 | The coefficient of linear expansion of brass is ( 2 times 10^{-5} C^{-1} . ) Find its (i) coefficient of superficial expansion, (ii) coefficient of cubical expansion. Let ( x ) and ( y ) be the answers write ( (y- ) ( boldsymbol{x}) times mathbf{1 0}^{mathbf{5}} ) | 11 |

480 | Which of the following can be described as convection current A. Sea Breeze and land Breeze B. Heat transfer from one end to another in a metal rod c. sun’s radiations D. None of these | 11 |

481 | Choose the wrong statements from the following. Two spheres made of the same material have the same diameter. One sphere is | 11 |

482 | Latent heat of vapourisation of water or latent heat of steam ( = ) | 11 |

483 | Two thermometers are used to record the temperature of a room. If the bulb of one is wrapped in wet hanky: A. The temperature recorded by both will be same. B. The temperature recorded by the wet-bulb thermometer will be greater than that recorded by the other C. The temperature recorded by dry-bulb thermometer will be greater than that recorded by the other D. None of the above | 11 |

484 | The nature of the graph of pressure ‘P’ against reciprocal of volume ‘V’ of an ideal gas at constant temperature is A. a straight line not passing through origin B. a parabola c. a straight line passing through origin D. a rectangular hyperbola | 11 |

485 | Which of the law can be understood in terms of Stefan’s law A. Wien’s displacement law B. Kirchoff’s law c. Newton’s law of cooling D. Planck’s law | 11 |

486 | How much heat is needed to melt the block of ice? A ( cdot 1.26 times 10^{4} ) 」 B . 4.2 ( times 10^{5} ) j c. ( 3.3 times 10^{5} ) j D. ( 6.6 times 10^{5} mathrm{J} ) E . ( 9.9 times 10^{5} mathrm{J} ) | 11 |

487 | A metal sphere of radius ( r ) and specific heat ( mathrm{S} ) is rotated about an axis passing through its centre at a speed of ( n ) rotations per second. It is suddenly stopped and ( 50 % ) of its energy is used in increasing its temperature. Then the rise in temperature of the sphere is? A ( cdot frac{2}{5} frac{pi^{2} n^{2} r^{2}}{S} ) C ( cdot frac{7}{8} pi r^{2} n^{2} S ) D・ ( 5left[frac{r n x}{[145]}right]^{2} ) | 11 |

488 | What is the name of the phase transition that occurs when a solid is converted directly into a gas (without going through the liquid phase)? A. vaporisation B. sublimation c. boiling D. melting | 11 |

489 | Assertion In the human body the heart acts as the pump that circulates blood through different parts of the body, transferring heat by forced convection. Reason In forced convection,material is forced to move by a pump or by some other physical means. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

490 | Which of the following is false for heat? ( A ). It is a form of energy. B. It cannot be seen but only can be felt. C. If a body’s temperature is increased, it gains heat energy D. It is always produced from chemical energy | 11 |

491 | A lead bullet penetrates into a solid object and melts. Assuming that ( 50 % ) of its kinetic energy was used to heat it, the initial speed of the bullet is (the initial temperature of the bullet is ( 25^{circ} mathrm{C} ) and its melting point is ( 300^{circ} mathrm{C} ) ). Latent heat of fusion of lead ( =2.5 times 10^{4} J / k g ) and specific heat capacity of lead ( = ) ( mathbf{1 2 5 J} / boldsymbol{k g}-boldsymbol{K} ) A. ( 100 mathrm{m} / mathrm{s} ) в. ( simeq 490 m / s ) ( mathrm{c} .520 mathrm{m} / mathrm{s} ) D. ( 360 mathrm{m} / mathrm{s} ) | 11 |

492 | Two metallic spheres ( S_{1} ) and ( S_{2} ) are made of the same material and have identical surface finish. The mass of ( S_{1} ) is three times to that of ( S_{2} ). Both the spheres are heated to the same high temperature and placed in the same room having lower temperature but are thermally insulated from each other. The ratio of the initial rate of cooling of ( S_{1} ) to that ( S_{2} ) is : A ( cdot frac{1}{3} ) в. ( left(frac{1}{3}right)^{frac{1}{3}} ) c. ( frac{1}{sqrt{3}} ) D. ( frac{sqrt{3}}{1} ) | 11 |

493 | The continuous movement of a fluid when heated is called: A. convectional current B. conduction current c. electric current D. magnetic current | 11 |

494 | An enclosure of volume 3 litre contains 16g of oxygen, 7g of nitrogen and 11g of carbondioxide at ( 27^{circ} mathrm{C} ). The pressure exerted by the mixture is approximately A. 9 atmosphere B. 8.3 atmosphere c. 3 atmosphere D. 1 atmosphere | 11 |

495 | Keeping the number of moles, volume and temperature the same, which of the following are the same for all ideal gases? A. rms speed of molecules B. Density c. Pressure D. Average magnitude of momentum | 11 |

496 | Same amount of heat is supplied to two liquids ( A ) and ( B ). The liquid ( A ) shows a greater rise in temperature. What can you say about the heat capacity of A as compared to that of B? A. Heat capacity of A is more than that of B B. Heat capacity of A is less than that of B c. Heat capacity of A is same as that of B D. can’t say | 11 |

497 | Two bodies are in thermal equilibrium. Which of the following quantities must be same for them? A. internal energy B. potential energy c. temperature D. mass | 11 |

498 | Keeping the number of moles, volume and pressure the same, which of the following are the same for all ideal gas? A. rms speed of a molecule B. density c. temperature D. average of magnitude of momentum | 11 |

499 | A difference of ( 1^{circ} mathrm{C} ) is as the difference of ( 1 K ) | 11 |

500 | Black bodies are: ( A cdot ) Good absorbers and bad radiators B. Good absorbers and good radiators C. Bad absorbers and good radiators D. Bad absorbers and bad radiators | 11 |

501 | Two identical rods of a mental are welded in series then 20 cal of heat flows through them in 4 minute. If the rods are welded in parallel then same amount of heat will flow in A. 1 minute B. 2 minute c. 4 minute D. 15 minute | 11 |

502 | The surroundings become warm when water in lakes start freezing in cold countries. Why? | 11 |

503 | Why are cold storages constructed with double walls? | 11 |

504 | A piece of ice of mass ( 40 g ) is dropped into ( 200 g ) of water at ( 50^{circ} mathrm{C} ). Calculate the final temperature of the water after all the ice has melted. Specific heat capacity of water ( =4200 J k g^{-1} K^{-1} ) Specific latent heat of fusion of ice ( = ) ( 336 times 10^{3} J k g^{-1} ) | 11 |

505 | Q Type your question volume. This is strictly true only if there are no external influences. A gas column under gravity, for example, does not have uniform density (and pressure). As you might expect, its density decreases with height. The precise dependence is given by the socalled law of atmospheres ( boldsymbol{n}_{2}=boldsymbol{n}_{1} exp left[-boldsymbol{m} boldsymbol{g}left(boldsymbol{h}_{2}-boldsymbol{h}_{1}right) / boldsymbol{k}_{B} boldsymbol{T}right] ) where ( n_{2}, n_{1} ) refer to number density at heights ( h_{2} ) and ( h_{1} ) respectively. Use this relation to derive the equation for sedimentation equilibrium of a suspension in a liquid column: ( boldsymbol{n}_{2}=boldsymbol{n}_{1} exp left[-boldsymbol{m} boldsymbol{g} boldsymbol{N}_{boldsymbol{A}}left(boldsymbol{rho}-boldsymbol{rho}^{prime}right)left(boldsymbol{h}_{2}-right.right. ) ( left.left.boldsymbol{h}_{1}right) /(boldsymbol{rho} boldsymbol{R} boldsymbol{T})right] ) where ( rho ) is the density of the suspended particle and ( rho^{prime} ) that of surrounding medium. ( left[mathrm{N}_{A} ) is Avogadro’s number, and right. ( mathrm{R} ) the universal gas constant. [Hint : Use Archimedes principle to find the apparent weight of the suspended particle.] | 11 |

506 | Dry ice is used in fire extinguishers. The dry ice is stored in the cylinder in a solid form. When sprayed on a fire it quickly changes into the gas known as carbon dioxide ( left(C O_{2}right) . ) What is this change of state called? A. Sublimation B. Condensation c. Distillation D. Evaporation | 11 |

507 | Statement- If the earth did not have an atmosphere, it would become extremely cold. Statement-2 Heat energy is transferred through air mainly by convection. A. Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation for Statement- B. Statement-1 is true, Statement-2 is true but Statement-2 is not the correct explanation for Staement- c. Statement- 1 is true, Statement- 2 is false. D. Statement- 1 is false, Statement-2 is true | 11 |

508 | A thick metallic cubical container of inner dimensions ( 1 mathrm{m} 1 mathrm{m} ) 1m and outer dimensions ( 1.2 mathrm{m} 1.2 mathrm{m} 1.2 mathrm{m} ) at ( 27^{0} mathrm{C} ) is used to store gas of volume ( 1 m^{3} ). The linear thermal expansion coefficient of the metal is positive. If the container is heated upto ( 100^{0} C ), then volume of gas it can contain at ( 100^{0} C ) is : A. more than ( 1 m^{3} ) B. less than1 ( m^{3} ) c. same a ( 1 m^{3} ) D. zero | 11 |

509 | It is hotter over the top of a fire than at the same distance on the sides because of A. convection of heat B. conduction of heat c. Radiation of heat D. conduction, convection and radiation of heat | 11 |

510 | State True or False. Numerically calorie is bigger than joule. | 11 |

511 | What is the principle of the method of a mixture? Name the law on which this principle is based. A. Newtons law of cooling B. none c. principle of calorimetry D. principle of heat transfer | 11 |

512 | State whether given statement is True or False The process of convection can takes | 11 |

513 | Assertion Maximum air flow due to convection does not occur at the north pole but it occurs at ( mathbf{3 0}^{circ} ) N. Reason There is maximum temperature difference between equator and ( 30^{circ} mathrm{N} ) A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

514 | Heat is flowing through two cylindrical rods made of same materials whose ends are maintained at similar temperatures. If diameters of the rods are in ratio 1: 2 and lengths in the ratio ( 2: 1, ) then the ratio of thermal current through in steady state is: A ( cdot 1: 8 ) B. 1: 4 ( c cdot 1: 6 ) D. 4: 1 | 11 |

515 | In what pressure range will the naphthalene compound sublime faster? A. Less than 0.5 atm B. Between 0.5 and 1.0 c. Between 1.0 and 2.0 D. This compound won’t sublime E. None of these | 11 |

516 | A box contains x molecules of a gas. How will the pressure of the gas be affected if the number of molecules is made ( 2 x ? ) A. Pressure will decrease B. Pressure will remain unchanged. c. Pressure will be doubled D. Pressure will become three times. | 11 |

517 | Why is a heater in winter installed near the floor of room? | 11 |

518 | Solids get heated by A. conduction B. convection c. radiation D. all the above | 11 |

519 | An aluminium measuring rod, which is correct at ( 5^{circ} mathrm{C} ) measures the length of a line as ( 80 mathrm{cm} ) at ( 45^{circ} mathrm{C} ). If thermal coefficient of linear expansion of aluminium is ( 2.50 times 10^{-5} ) per ( ^{o} ) C.The correct length of line is : A ( .80 .08 mathrm{cm} ) B. ( 79.92 mathrm{cm} ) c. ( 81.12 mathrm{cm} ) D. ( 79.62 mathrm{cm} ) | 11 |

520 | It is hotter at the same distance over the top of a fire than it is on the side of it mainly because: A. Heat is radiated upwards B. Air conducts heat upwards c. convection takes more heat upwards D. conduction, convection and radiation all contribute significantly in transferring heat upwards. | 11 |

521 | If the temperature of a hot body is increased by ( 50 % ) then the increase in the quantity of emitted heat radiation will be A. ( 125 % ) B . 200% c. 300% D. 400% | 11 |

522 | If 10 grams of ice and 1 gram of steams are allowed to attain thermal equilibrium, what will be the resultant temperature. | 11 |

523 | A compound of ammonia which sublimes on heating is: A. ammonium sulphate B. ammonium nitrate c. ammonium chloride D. ammonium nitrite | 11 |

524 | If we take some water at ( 0^{circ} mathrm{C} ) and start heating it,we find that in the temperature range ( 0^{circ} mathrm{C} ) to ( 4^{circ} mathrm{C} ) A. It expands on heating B. It contracts on heating c. Both D. None | 11 |

525 | At constant pressure, the ratio of increase in volume of an ideal gas per degree rise in kelvin temperature to its original volume is (T= absolute temperature of the gas) is A ( cdot T^{2} ) в. ( T ) c. ( 1 / T ) D. ( frac{1}{T^{2}} ) | 11 |

526 | Numerically, calorie is bigger than joule. A . True B. False | 11 |

527 | A mixture of iodine and sand can be separated by: A. separating funnel B. magnetic separation c. sublimation D. centrifugation | 11 |

528 | The snow on the mountain does not melt all at once when it is heated by the sun because it A. Becomes very hard B. reflects most of the heat from the sun c. has a low specific heat capacity D. has a high latent heat of fusion | 11 |

529 | Why does not all the now all the snow on the mountains melt to water after winter is over? | 11 |

530 | Iron or steel is used in reinforcement in concrete because: A. Concrete has high coefficient of expansion than iron or steel B. Concrete has low coefficient of expansion than iron or steel c. Both have nearly equal coefficient of expansions D. Iron or steel is a good conductor of heatt | 11 |

531 | The unit for the coefficient of apparent expansion is A . cm в. ( c m /^{0} C ) ( mathbf{c} cdot c m^{0} C ) D. ( /^{circ} mathrm{C} ) | 11 |

532 | The pressure of a gas in a container is ( 10^{-11} ) pascal at ( 27^{circ} mathrm{C} . ) The number of molecules per unit volume of vessel will be A ( cdot 6 times 10^{23} mathrm{cm}^{-3} ) В. ( 2.68 times 10^{19} mathrm{cm}^{-3} ) c. ( 2.5 times 10^{6} mathrm{cm}^{-3} ) D. ( 2400 mathrm{cm}^{-3} ) | 11 |

533 | Two bodies are said to be in the state of thermal equilibrium if there is no transfer of heat taking place between them. True or false. A . True B. False | 11 |

534 | Assertion: gases are characterised with two coefficients of expansion Reason: when heated both volume and pressure increase with the rise in temperature A. Both assertion (A) and reason (R) are correct and ( mathrm{R} ) gives the correct explanation B. Both assertion (A) and reason (R) are correct but R doesnt give the correct explanation c. ( A ) is true but ( R ) is false D. A is false but R is true | 11 |

535 | A copper ball of mass ( 100 g m ) is at a temperature ( T . ) It is dropped in a copper calorimeter of mass ( 100 g m ), filled with ( 170 g m ) of water at room temperature. Subsequently the temperature of the system is found to ( 6475^{circ} . T ) is given by then (Given: room temperature ( =mathbf{3 0}^{circ} boldsymbol{C} ) specific heat of copper ( = ) ( mathbf{0 . 1} c mathbf{a l} / mathbf{g m}^{o} boldsymbol{C} ) A. ( 825^{circ} mathrm{C} ) в. ( 800^{circ} mathrm{C} ) c. ( 885^{circ} mathrm{C} ) D. ( 1250^{circ} mathrm{C} ) | 11 |

536 | Three bodies ( A, B ) and ( C ) are in thermal equilibrium. The temperature of ( B ) is ( 45^{circ} C . ) Then the | 11 |

537 | It is hotter at the same distance over the top of a fire than it is on the side of it mainly because A. Heat is radiated upwards B. Air conducts heat upwards c. convection takes more heat upwards D. conduction, convection and radiation all contribute significantly in transferring heat upwards | 11 |

538 | What type of conductor should we used to make water pipes in cold countries? A. Good conductor B. Poor conductor or bad conductor C. Material does not help in such cases D. None of the above | 11 |

539 | A good absorber is a good A. Emitter B. Radiator C. Emitter and Absorber both D. None | 11 |

540 | When an object is heated it…………..and when it cools it. | 11 |

541 | In the equation PV=constant, the numerical value of constant depends upon a) temperature b) mass of the gas c) system of units used d) nature of the gas ( A cdot a & b ) B. b & ( c cdot c & d ) D. all | 11 |

542 | To increase the length of brass rod by ( 2 % ) its temperature should increase by: ( left(propto=0.00002 K^{-1}right) ) A . 800 в. 900 ( c .1000 ) D. 1100 | 11 |

543 | Constant volume thermometer works on A. Archemedis principle B. Boyles law c. charles law D. Pascal law | 11 |

544 | Name the process associated with the following. Dry ice is kept at room temperature and at one atmospheric pressure. A. Evaporation B. Sublimation c. condensation D. Liquefaction | 11 |

545 | In experiment of convection heat transfer, water inside the pipe is heated by which of the following principles, A. free convection+conduction B. free convection c. forced convection D. mixed convection | 11 |

546 | In a resistance thermometer, the resistances at ( 0^{circ} mathrm{C} ) and ( 100^{circ} mathrm{C} ) are 6.74 and 7.74 ohm respectively. The temperature corresponding to 6.53 ohm resistance is. ( mathbf{A} cdot+53^{circ} C ) B. ( +21^{circ} mathrm{C} ) ( mathbf{c} .-53^{circ} mathrm{C} ) D. ( -21^{circ} mathrm{C} ) | 11 |

547 | place two substances, 1 and 2 in contact with each other so that they exchange heat with each other only, until they come to the same temperature. The mass of substance 1 is twice as much as the mass of substance 2. The temperature change for substance 2 is three times as much as the temperature change for substance 1. How does the specific heat of substance 2 compare to the specific heat of substance 1? A. The specific heat of substance 2 is ( 3 / 2 ) as much as the specific heat of substance 1 B. The specific heat of substance 2 is ( 2 / 3 ) as much as the specific heat of substance 1 c. The specific heat of substance 2 is bigger than the specific heat of substance 1, but we cannot determine how much bigger D. The specific heat of substance 2 is smaller than the specific heat of substance 1, but we cannot determine how much smaller E. We cannot determine how the specific heat of substance 2 is related to the specific heat of substance | 11 |

548 | The amount of heat supplied to ( 4 x ) ( 10^{-2} ) kg of nitrogen at room temperature to rise its temperature by ( 50 C ) at constant pressure is (Molecular mass of nitrogen is 28 and ( R=8.3 J ) ( left.boldsymbol{m o l}^{-1} boldsymbol{K}^{-1}right) ) A ( .2 .08 k J ) в. ( 3.08 k J ) c. ( 4.08 k J ) D. ( 5.08 k J ) | 11 |

549 | By which process can we separate camphor from ammonium chloride? A. Filtration B. Sublimation c. Dissolution and evaporation D. Distillation | 11 |

550 | A long silver tea spoon is placed in a cup filled with hot tea. After some time, the exposed end (the end which is not dipped in tea) of the spoon becomes hot even without a direct contact with the tea. This phenomenon can be explained mainly by A. conduction B. reflection c. radiation D. thermal expansion | 11 |

551 | The correct arrangement for taking temperature in the study of the temperature-time graph is shown in figure A . ( A ) B. ( B ) ( c . c ) D. ( D ) | 11 |

552 | Heat is a from of A. Energy B. Work c. Power D. None of these | 11 |

553 | State whether the given statement is True or False. Most of the heat transfer that is taking | 11 |

554 | A bullet moving with a uniform velocity stops suddenly after hitting target. Let whole mass melts be ( m ), specific heat be ( S, ) initial temperature be ( 25^{circ} C ) melting point be ( 475^{circ} C ), and the latent heat be ( L . ) Then ( v ) is given by | 11 |

555 | Sublimation cannot be used for purification of: A . urea B. camphor c. benzoic acid D. napthalene | 11 |

556 | Rate of heating in forced convection experiment can be increased by This question has multiple correct options A. increasing the speed of flow of liquid accross the heated section. B. increasing the surface area of contact of water with heated section. c. decreasing the thermal conductivity of fluid flowing. D. increasing the thermal conductivity of heated container | 11 |

557 | If there are no heat losses, the quantity of heat gained by the cold body is equal to the quantity of by the hot body. | 11 |

558 | Assertion Though air is a bad conductor yet a body kept in air loses heat quickly. Reason The heat loss is mainly due to radiation. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

559 | A pan filled with hot food cools from ( 50.1^{circ} mathrm{C} ) to ( 49.9^{circ} mathrm{C} ) in 5 sec. How long in seconds will it take to cool from ( 40.1^{circ} mathrm{C} ) to ( 39.9^{circ} mathrm{C} ) if room temperature is ( 30^{circ} mathrm{C} ) ? | 11 |

560 | Infrared radiation are detected by A. spectrometer B. pyrometer c. nanometer D. photometre | 11 |

561 | How does the average kinetic energy of a gas molecule depend on the absolute temperature of the gas? | 11 |

562 | Assertion: Gasses obey Boyle’s law at high temperature and low pressure only. Reason: At low pressure and high temperature, gasses would behave like ideal gases. A. Both assertion (A) and reason (R) are correct and gives the correct explanation B. Both assertion (A) and reason (R) are correct but ( R ) does give the correct explanation c. ( A ) is true but ( R ) is false D. A is false but R is true | 11 |

563 | A solid at temperature ( T_{1} ) is kept in an evacuated chamer at temperature ( T_{2}>T_{1} . ) The rate of increase of temperature of the body is proportional to A ( cdot T_{2}-T_{1} ) B . ( T_{2}^{2}-T_{1}^{2} ) ( mathbf{c} cdot T_{2}^{3}-T_{1}^{3} ) D. ( T_{2}^{4}-T_{1}^{4} ) | 11 |

564 | On the heating curve diagram the section representing liquid only is ( A cdot P Q ) B. QR c. RS D. st | 11 |

565 | There are two solar energy collectors made up of thin aluminium sheet. They are flat and uncoated. Collector ‘ ( boldsymbol{A}^{prime} ) is rectangular measuring ( 20 mathrm{cm} ) long and ( mathbf{1 5} mathrm{cm} ) wide while collector’ ( boldsymbol{B}^{prime} ) is circular having ( 20 mathrm{cm} ) diameter. If they are kept under mid-day sun for long time then, A. both the collectors ( A ) and ( B ) will show nearly the same temperature B. collector ( A ) will show higher temperature than ( B ) c. collector ( B ) will show higher temperature than ( A ) D. there will be no rise in the temperature of the two collectors, as they are uncoated | 11 |

566 | Convection occurs usually in A. Solids B. Fluids ( c . ) Both D. None | 11 |

567 | Assertion: In Joules bulb apparatus, as reservoir is moved up, the mercury level raises into the bulb. Reason: The pressure on the enclosed gas increases. | 11 |

568 | A one litre sphere and a two litre sphere are connected with a capillary tube of negligible volume. They contain an ideal ( operatorname{gas} ) at ( 27^{circ} mathrm{C} ) at a pressure of ( 100 mathrm{cm} ) of ( mathrm{Hg} ) Keeping the temperature of one litre sphere constant at ( 27^{circ} mathrm{C} ), if temperature of two litre sphere is increased to ( 127^{0} mathrm{C} ), then the final pressure is A. ( 110 mathrm{cm} ) of ( mathrm{Hg} ) B. 120 cm of Hg c. ( 150 mathrm{cm} ) of ( mathrm{Hg} ) D. 200 cm of Hg | 11 |

569 | A body of mass ( m ) has heat capacity equal to ( C . ) If mass is doubled to ( 2 m ) what is the new heat capacity? A ( cdot frac{C}{2} ) в. ( C ) c. ( 2 C ) D. ( frac{3 C}{2} ) | 11 |

570 | N moles of a monoatomic gas is carried round the reversible rectangular cycle ABCDA as shown in the diagram. The temperature at ( boldsymbol{A} ) is ( boldsymbol{T}_{mathbf{0}} . ) The thermodynamic efficiency of the cycle is A. ( 15 % ) B. ( 50 % ) ( c cdot 20 % ) D. ( 25 % ) | 11 |

571 | Express ( 0 C ) in kelvin. | 11 |

572 | At ( 0^{circ} mathrm{C} ) temperature and 1 atmospheric pressure a given mass of gas occupies a volume of ( 273 c c ). Its volume at the same pressure and at ( 50^{0} mathrm{C} ) is ( mathbf{A} cdot 323 c c ) B. ( 273 c c ) c. ( 546 c c ) D. ( 112 c c ) | 11 |

573 | The resistance of platinum wire is 2.4 ohms at ( 0^{circ} mathrm{C} ) and 3.4 ohms at ( 100^{circ} mathrm{C} ). If the resistance at ( t^{circ} C ) is 4 ohms then the temperature ( t ) is equal to A ( cdot 160^{circ} mathrm{C} ) В. ( 140^{circ} mathrm{C} ) c. ( 180^{circ} mathrm{C} ) D. ( 120^{circ} mathrm{C} ) | 11 |

574 | The walls of an enclosure are maintained at a steady temperature ( T ) When two similarly calibrated thermometers are placed inside the enclosure, they give the same reading ( boldsymbol{T} ) after thermal equilibrium has been established. Which statement correctly describes the required conditions? A. under all circumstances B. only if they absorb radiation at equal rates c. only if they have equal thermal capacities D. only if both are perfect absorbers | 11 |

575 | A body with an initial temperature ( theta_{1} ) is allowed to cool in a surrounding which is at a constant temperature of ( boldsymbol{theta}_{0}left(boldsymbol{theta}_{0}<right. ) ( theta_{1} ) ). Assume that Newton's law of cooling is obeyed. The temperature of the body after time ( t ) is best expressed by, Let ( k= ) constant. A ( cdotleft(theta_{1}-theta_{0}right) e^{-k t} ) B ( cdotleft(theta_{1}-theta_{0}right) ln (k t) ) c. ( theta_{0}+left(theta_{1}-theta_{0}right) e^{-k t} ) D. ( theta_{1} e^{-k t}=theta_{0} ) | 11 |

576 | If same amount of milk and water are kept in two beakers and heated on the two burners of a gas by supplying equal amount of heat. Despite this, why is the rise in temperature of milk more than that of water? | 11 |

577 | S.I unit of Heat Capacity is | 11 |

578 | The solar heat and light reach the earth via A. radiation B. conduction c. convection D. all of these | 11 |

579 | A scientist wants to raise the temperature of ( 0.1 mathrm{Kg} ) sample of glass from ( -45^{0} C ) to ( 15^{0} C . ) How much heat energy is required to raise the temperature? (SHC of glass ( left.boldsymbol{8} boldsymbol{J} / boldsymbol{K} boldsymbol{g} /^{o} boldsymbol{C}right) ) | 11 |

580 | How much heat would be required to convert 14 kg of ice at ( 0^{circ} mathrm{C} ) into water of ( mathbf{0}^{circ} mathbf{C} ) ? A . 4704 J в. 4704 k c. 336 J D. 336 kJ | 11 |

581 | If the pressure of a gas contained in a closed vessel increases by ( times % ) when heated by ( 1^{0} C ), its initial temperature is A ( cdot frac{100}{x} ) Kelvin B. ( frac{100}{x} ) Celsius C. ( frac{x+100}{x} ) Kelvin D. ( frac{100-x}{x} ) Celsius | 11 |

582 | Which of the following pairs may give equal numerical values of the temperature of a body? A. Fahrenheit and celsius B. Celsius and kelvin c. Kelvin and Reaumur D. None of these | 11 |

583 | The table below shows the melting point of three liquids. ( begin{array}{lll}text { Melting point } & text { Boiling point } \ text { Alcohol } & -115^{circ} mathrm{C} & 78^{circ} mathrm{C} \ text { Mercury } & -39^{circ} mathrm{C} & 357^{circ} mathrm{C} \ text { Water } & 0^{circ} mathrm{C} & 100^{circ} mathrm{C}end{array} ) Which liquid is most suitable to be used in a thermometer for measuring a temperature range of ( -10^{circ} mathrm{C} ) to ( 95^{circ} mathrm{C} ) | 11 |

584 | One gram mol of helium at ( 27^{0} mathrm{C} ) is mixed with three gram mols of oxygen at ( 127^{0} mathrm{C} ) at constant pressure. If there is no exchange of heat with the atmosphere then the final temperature will be ( A cdot 375 K ) в. 175k c. ( 475 mathrm{k} ) D. 575K | 11 |

585 | State True or False : Convection is not possible in vacuum. A. True B. False | 11 |

586 | is the heat supplied during change of state of matter. A. Enthalpy B. Latent heat c. Endothermic D. Exothermic | 11 |

587 | Two moles of oxygen is mixed with eight moles of helium. The effective specific heat of the mixture at constant volume is: A . 1.3 R B. 1.4R c. ( 1.7 mathrm{R} ) D. 1.9R | 11 |

588 | A vertical cylinder closed at both ends is fitted with a smooth piston dividing the volume into two parts each containing one mole of air. At the equilibrium temperature of ( 320 mathrm{K} ), the upper and lower parts are in the ratio ( 4: 1 . ) The ratio will become 3: 1 at a temperature of? A . ( 450 mathrm{k} ) в. 228 к c. ( 420 mathrm{K} ) D. ( 570 k ) | 11 |

589 | A body absorbs 1000 calories of heat when it is heated from ( 20^{0} C ) to ( 70^{0} C ) The water equivalent of the body is ( A cdot 10 g ) B. ( 15 mathrm{g} ) c. ( 20 g ) D. 25 | 11 |

590 | Three discs ( A, B ) and ( C ) having radii ( 2 m, 4 m ) and ( 6 m ) respectively are coated with carbon black on their outer surface. The wavelengths corresponding to the maximum intensity are ( 300 m m, 500 m m ) and ( 800 m m ) respectively. The power radiated by them are ( Q_{A}, Q_{B} ) and ( Q_{C} ) respectively. Then A. ( Q_{A} ) is maximum B. ( Q_{B} ) is maximum c. ( Q_{c} ) is maximum | 11 |

591 | A sphere of coefficient of linear expansion ( alpha, ) mass ( mathrm{m} ) and radius ( mathrm{r} ) is spinning about an axis through its diameter with an angular velocity ( omega ) when it is heated such that its temperature increases by ( Delta t, ) the angular velocity becomes. ( A ) [ omega(1+alpha Delta t)^{2} ] B. [ frac{omega}{(1+alpha Delta t)^{2}} ] c. [ omega(1+alpha Delta t) ] D. ( omega alpha Delta t ) | 11 |

592 | Why is a ventilator provided in a room? | 11 |

593 | A liter of air at ( 20^{circ} mathrm{C} ) is heated until both the pressure and the volume are tripled, what is the tempertare then. В . ( 927^{circ} ) К ( mathbf{c} cdot 200^{circ} K ) D. ( 977^{circ} K ) | 11 |

594 | Describe an experiment to show that a black (or dull) surface is a better absorber of heat radiations than a polished one. | 11 |

595 | What is the temperature for which the readings on Kelvin and Fahrenheit Scales are same? | 11 |

596 | The specific heat capacities of two bodies ( A ) and ( B ) is 1: 2 and masses in the ratio 3: 4 respectively. The ratio of their heat capacities is: A .3: 2 B. 2: 3 c. 6: 16 D. 3: 8 | 11 |

597 | The number of quanta of radiation of frequency ( 4.98 times 10^{14} s^{-1} ) required to melt 100 g of ice are (latent heat of melting of ice is 33 joule per ( g ) ): A ( cdot 10^{20} ) B. ( 10^{2} ) ( c cdot 10^{24} ) D. ( 6.023 times 10^{21} ) | 11 |

598 | Air is a conductor of electricity. A. Good B. Badd c. Both D. None | 11 |

599 | A wooden rod is dipped in a cup of ice cream. The other end of wooden rod A. Becomes cold by process of conduction B. Becomes cold by process of radiation c. Becomes cold by process of convection D. Does not become cold | 11 |

600 | A metal rod of length ( L ) cross-sectional area A Young’s modulus Y and coefficient of linear expansion ( alpha ) is heated to ( t^{o} C . ) The work that can be performed by the rod when heated is: A ( cdot frac{Y A alpha L t^{2}}{2} ) B. ( frac{Y A alpha^{2} L t^{2}}{2} ) ( frac{Y A alpha^{2} L^{2} t^{2}}{2} ) D. ( frac{Y A alpha L t}{2} ) | 11 |

601 | A thin brass sheet at ( 10^{circ} C ) and a thin steel sheet at ( 20^{circ} C ) have the same surface area. The common temperature at which both would have the same area is: (Coefficients of linear expansion for brass and steel are ( 19 times 10^{-6} /^{circ} mathrm{C} ) and ( 11 times 10^{-6} /^{circ} C quad ) respectively A. ( -3.75^{circ} mathrm{C} ) B . ( -2.75^{circ} mathrm{C} ) ( mathbf{c} cdot 2.75^{circ} mathrm{C} ) D. ( 3.75^{circ} mathrm{C} ) | 11 |

602 | Which of the following is not a reason for using woolen clothes in Winter? A. Wool is an insulator of heat. B. It traps a layer of air in its fabric. C. Air being an insulator doesn’t allow body heat to escape into the atmosphere. D. All the above | 11 |

603 | The quantity of heat required to raise the temperature of a body through one degree Celsius is known as: A. Latent heat of body B. Specific latent heat of body c. Heat capacity of a body D. None | 11 |

604 | Heat is not transferred by the process of convection in: A. solid B. liquid c. gas D. none of the above | 11 |

605 | The Sl unit of temperature is | 11 |

606 | For proper ventilation of building, windows must be open near the bottom and top of the walls so as to let pass. A. In more air B. In hot air near the roof and cool air out near the bottom c. out hot air near the roof D. In cool air near the bottom and hot air out of the roof | 11 |

607 | Water at normal atmospheric pressure boils at : ( mathbf{A} cdot 0^{circ} C ) B. ( 100^{circ} mathrm{C} ) c. ( 250 K ) D. ( 50^{circ} mathrm{C} ) | 11 |

608 | Two rods of the same length and diameter having thermal conductivities ( boldsymbol{K}_{mathbf{1}} boldsymbol{K}_{mathbf{2}} ) are joined in parallel. The equivalent thermal conductivity of the combination is: A. ( frac{K_{1} K_{2}}{K_{1}+K_{2}} ) в. ( K_{1}+K_{2} ) c. ( frac{K_{1}+K_{2}}{2} ) D. ( sqrt{K_{1} K_{2}} ) | 11 |

609 | In defining the specific heat, temperature is represented in ( ^{o} boldsymbol{F} ) instead of ( ^{circ} mathrm{C} ). Then the value of specific heat will: A. decrease B. increase c. remain constant D. be converted to heat capacity | 11 |

610 | The graph drawn between pressure and temperature at constant volume for a given mass of different molecular weights ( M_{1} ) and ( M_{2} ) are the straight lines as shown in the figure then ( mathbf{A} cdot M_{2}>M_{1} ) ( mathbf{B} cdot M_{1}>M_{2} ) ( mathbf{c} cdot M_{1}=M_{2} ) ( mathbf{D} cdot M_{1}^{3}=M_{2} ) | 11 |

611 | Dry ice is an example of process. A. Evaporation B. Crystallization c. Sublimation D. Purification | 11 |

612 | Fill in the blanks: The of water is defined as the constant temperature at which water changes to steam. A. melting point B. boiling point c. saturation point D. all of the above | 11 |

613 | Sl units of thermal conductivity are ( A cdot W / m-K ) B. W/m ( c cdot w / k ) D. None | 11 |

614 | According to Wien’s law: A ( cdot lambda_{m} T= ) constant B. ( frac{lambda_{m}}{T}= ) constant c. ( lambda_{m} sqrt{T}= ) constant D. ( frac{lambda_{m}}{sqrt{T}}= ) constant | 11 |

615 | On a Fahrenheit scale: A. boiling point of water is ( 212^{circ} F ) B. the temperature will be equal to that on the Celsius scale ( a t-40^{circ} C ) C. the difference between the upper fixed point and the lower fixed point is divided into 180 equal parts D. all the above | 11 |

616 | Which of the following is the smallest temperature? A ( cdot 1^{circ} R ) B. ( 1^{circ} mathrm{C} ) ( mathbf{c} cdot 1^{o} F ) D. ( 1 K ) | 11 |

617 | Latent heat of fusion of ice is: A ( .336 k J k g^{-1} ) в. ( 663 k J k g^{-1} ) c. ( 363 k J k g^{-1} ) D. ( 636 k J k g^{-1} ) | 11 |

618 | A body initially at ( 60^{circ} mathrm{C} ) cools to ( 50^{circ} mathrm{C} ) in 10 min. What will be it’s temperature at the end of the next 10 min. if the roc temperature is ( 20^{circ} ) C.Assume newton’s law of cooling. A ( cdot 42.50^{circ} mathrm{C} ) B. ( 45^{circ} mathrm{C} ) c. ( 40.46^{circ} mathrm{C} ) D. ( 44.23^{circ} mathrm{C} ) | 11 |

619 | Why are glass tumblers made of thin glass? | 11 |

620 | The specific heat capacity of a substance depends on its This question has multiple correct options A. nature B. mass c. rise in temperature D. Both (2) and (3) | 11 |

621 | The process by which a solid changes directly into gas is called: A. decantation B. sublimation c. condensation D. sedementation | 11 |

622 | The heat capacity of a material depends upon. A. density of matter B. specific heat of matter c. temperature of matter D. structure of matter | 11 |

623 | The ratio of thermal capacities of two copper spheres of radii ( 5 mathrm{cm} ) and ( 10 mathrm{cm} ) is ( A cdot 1: 4 ) B. 4: c. 1: 8 D. 8: 1 | 11 |

624 | Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations: | 11 |

625 | A car tyre has air at 1.5 atm at 300 K.If ( P ) increases to 1.75 atm with volume same the temperature will be ( A cdot 350^{0} C ) в. з5ок c. ( 300^{circ} mathrm{C} ) D. 300k | 11 |

626 | A piece of iron of mass ( 2.0 mathrm{kg} ) has a thermal capacity of ( 966 J K^{-1} ). Find its specific heat capacity in S.I. unit. A ( cdot 1932 mathrm{Jkg}^{-1} mathrm{K}^{-1} ) B . ( 241.5 mathrm{Jkg}^{-1} mathrm{K}^{-1} ) c. ( 966 mathrm{Jkg}^{-1} mathrm{K}^{-1} ) D. 483 Jkg( ^{-1} K^{-1} ) | 11 |

627 | A vessel of volume 4 litres contains a mixture of ( 8 ~ g ) of ( 0_{2}, 14 ) g of ( mathrm{N}_{2} ) and ( 22 mathrm{g} ) of ( mathrm{CO}_{2} ) at ( 27^{circ} mathrm{C} ). The pressure exerted by the mixture is A ( cdot 5 times 10^{6} N / m^{2} ) B . ( 6 times 10^{3} N / m^{2} ) c. 10 atmosphere D. ( 7.79 times 10^{5} N / m^{2} ) | 11 |

628 | Assertion At absolute zero, the molecular energy is minimum Reason At absolute zero, the temperature is minimum A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

629 | In which of the following process convection does not take place primarily? A. Sea and land breeze B. Trade wind c. Boiling of water D. Warming of glass of bulb due to filament | 11 |

630 | The temperature of stars is determined by A. Stefan’s law B. Wien’s displacement law c. Kirchhoff’s law D. Ohm’s law | 11 |

631 | One ( mathrm{Kg} ) of a diatomic gas is at a pressure of ( 8 times 10^{4} mathrm{N} / mathrm{m}^{2} . ) The density of the gas is ( 4 mathrm{kg} / mathrm{m}^{3} . ) The energy of the gas due to its thermal motion will be B . ( 5 times 10^{4} ) 」 c. ( 6 times 10^{4} ) 」 D. ( 7 times 10^{4} ) 」 | 11 |

632 | During day time air blows- A. from the land to the sea B. from the sea to the land C. from one sea to another D. none of these | 11 |

633 | If ( 1 c a l=4.2 J, ) then ( 0.2 c a l g^{-1} o C^{-1}= ) ( ldots J k g^{-1} K^{-1} ) A . 800 B. 820 ( c cdot 840 ) D. 860 | 11 |

634 | Q Type your question the graph between the temperature ( T ) of the metal and time ( t ) will be closest to: ( A ) B. ( c ) ( D ) | 11 |

635 | The relation between volume ( V ), pressure ( mathrm{P} ) and absolute temperature ( mathrm{T} ) of an ideal gas is ( mathrm{PV}=mathrm{xT} ), where ( mathrm{xis} ) a constant. The value of ( x ) depend upon A. the mass of the gas molecule B. the average kinetic energy of the gas molecules C. P, V and T D. the number of gas molecules in volume ( V ) | 11 |

636 | State : True or False Heat required to raise the temperature of 18 of substance through ( 1^{0} C ) is called thermal capacity of a substance. | 11 |

637 | Inside human body,which of the following is responsible for heat transfer, A. conduction B. forced convection c. free convection D. none of the above | 11 |

638 | A polished metal plate with a rough black spot on it is heated to about ( 1400 K ) and quickly taken into a dark room. Then A. The spotwill appear brighter than the plate B. The spot will appear darker than the plate c. Heat conduction is easier downward D. It is easier and more convenient to do so | 11 |

639 | A piece of water melon stays cool for a longer time than sandwitches when both of them are taken out from the refrigerator on a hot day. Why? | 11 |

640 | ( 5 mathrm{kg} ) of water at ( 10^{circ} mathrm{C} ) is added to ( 10 mathrm{kg} ) of water at ( 40^{circ} mathrm{C} ) Neglecting heat capacity or vessel and other losses, the equilibrium temperature will be A ( cdot 30^{circ} mathrm{C} ) B . ( 25^{circ} mathrm{C} ) ( mathbf{c} cdot 35^{circ} C ) D. ( 33^{circ} mathrm{C} ) | 11 |

641 | In superficial expansion of solids A. Increase in thickness is negligible as compared to increase in length and breadth B. Increase in length and breadth is negligible as compared to increase in thickness c. Both D. None | 11 |

642 | Rice takes longest time to cook A. at sea level B. at shimla C. at Mount Everest D. in a submarine ( 100 mathrm{m} ) below the surface of sea | 11 |

643 | What does the slope of the graph represent? | 11 |

644 | What do you understand by the term latent heat? | 11 |

645 | The maximum energy in the thermal radiation from a heat source occurs at a wavelength of ( 12 times 10^{-5} mathrm{cm} . ) According to Wien’s displacement law, the temperature of this source will be ‘n’ times the temperature of another source for which the wavelength at maximum energy is ( 6 times 10^{-5} mathrm{cm} . ) Then the value of ( n ) is A . ( 1 / 2 ) B. 1 ( c cdot 2 ) D. 4 | 11 |

646 | Length of a wire at room temperature is ( 4.55 m, ) when the temperature increase upto ( 100^{circ} mathrm{C} ) then its length becomes 4.57 ( m ). The coefficient of linear expansion ( (alpha) ) of the given wire is A. ( 5.021 times 10^{-5} K^{-1} ) B. ( 6.021 times 10^{-5} K^{-1} ) c. ( 7.021 times 10^{-5} K^{-1} ) D. ( 8.021 times 10^{-5} K^{-1} ) | 11 |

647 | The saturated vapour pressure of water at ( 100^{circ} C ) is A. ( 750 mathrm{mm} ) of ( mathrm{Hg} ) B. 760 mm of Hg c. ( 76 mathrm{mm} ) of ( mathrm{Hg} ) D. 7.6 cm of Hg | 11 |

648 | One of the most common phenomenon related to rainfall is A. Evaporation B. Vaporization c. Fusion D. Solidification | 11 |

649 | A body of mass 5 kg falls from a height of 20 metres on the ground and it rebounds to a height of 0.2 If the loss in Potential energy is used up by the body then what will be the temperature rise? (specific heat of material = 0.09 ( left.operatorname{cal} mathfrak{g m}^{-1 circ} boldsymbol{C}^{-1}right) ) ( mathbf{A} cdot 0^{circ} C ) B . ( 4^{circ} mathrm{C} ) ( mathbf{c} cdot 8^{circ} C ) D. None of these | 11 |

650 | A sphere, a cube and a thin circular disc all made of the same material, have same mass. Their initial temperature is ( 3 times 10^{3}^{circ} mathrm{C} . ) The body which cools rapidly is : A. sphere B. cube c. both sphere and cube D. circular plate | 11 |

651 | A sphere of radius ( R ), density ( D ) and specific heat ( S ) is heated to temperature ( theta ) and surrounding is at temperature ( theta_{0} . ) Its rate of fall of temperature will be proportional to A. ( D S / R ) в. ( R / D S ) ( mathrm{c} .1 / R D S ) D. ( R D S ) | 11 |

652 | Assertion: PV/T=constant for 1 gram of gas. This constant varies from gas to gas. Reason: 1 gram of different gases at ( mathrm{NTP} ) Occupy different volumes. A. Both assertion (A) and reason (R) are correct and R gives the correct explanation B. Both assertion (A) and reason (R) are correct but R doesnt give the correct explanation C. A is true but R is false D. A is false but R is true | 11 |

653 | When a bar of iron ( 50.0 mathrm{cm} ) long at ( 15^{circ} mathrm{C} ) is heated in a furnace, it becomes ( 50.4 mathrm{cm} . ) If the coefficient of linear expansion of iron is ( 1.1 times 10^{-5} C^{o-1} ) find the temperature of furnace. | 11 |

654 | What is the Sl unit of heat capacity of body? A. ( J / K ) в. ( J K ) ( c . J ) D. ( ^{circ} C ) | 11 |

655 | Which one of the following substances is a mixture? A. water B. copper c. Seawater D. salt | 11 |

656 | Fill up the blank with suitable words Unit of heat capacity is | 11 |

657 | The surface temperature of the sun which has maximum energy emission at ( 500 mathrm{nm} ) is ( 6000 mathrm{K} ). The temperature of a star which has maximum energy emission at ( 400 mathrm{nm} ) will be ( mathbf{A} .8500 K ) в. ( 4500 K ) c. ( 7500 K ) D. ( 6500 K ) | 11 |

658 | In the following solids thermal conductivity is maximum for : A. copper B. aluminium c. gold D. silver | 11 |

659 | Name the device which is used to measure temperature. A. Caloriemeter B. Thermometer c. vermier calliper D. None | 11 |

660 | Water be boiled by sending steam into it | 11 |

661 | In a winter season, a block is formed of concrete of the volume ( 2.0 mathrm{m}^{3} ) at the temperature ( 5^{circ} mathrm{C} ). Calculate the change in volume of the block at the temperature ( 35^{circ} C ) during summer day given that its coefficient of volume expansion is ( 4.0 times 10^{-5} /^{circ} mathrm{C} ) A ( .160 mathrm{cm}^{3} ) В. ( 1,200 mathrm{cm}^{3} ) C ( .1,600 mathrm{cm}^{3} ) D. ( 2,400 mathrm{cm}^{3} ) E. ( 3,200 mathrm{cm}^{3} ) | 11 |

662 | What happens to the rate of evaporation when there is more exposed surface area of liquid? A. It decreases gradually B. It increases c. Remains same D. It decreases rapidly | 11 |

663 | State whether true or false. The land and sea breezes are based on the fact that the specific heat of vaporisation of steam is very high. A . True B. False | 11 |

664 | It takes ten minutes to increase the temperature of a body from ( 70^{circ} mathrm{C} ) to ( 80^{circ} ) c. Time required to increase the temperature of the body from ( 60^{circ} ) to ( 70^{circ} ) would be. A. More than 10 minutes B. Less than 10 minutes c. 10 minutes D. Data is inadequate so can’t be determined | 11 |

665 | If for hydrogen ( S_{p}-S_{v}=a ) and for oxygen, ( S_{p}-S_{v}=b ) where ( S_{p} ) and ( S_{v} ) are specific heat at constant pressure and at constant volume, then ( mathbf{A} cdot a=b ) в. ( a=16 b ) c. ( b=16 a ) D. ( a ) and ( b ) are not pressures | 11 |

666 | A thermally insulated vessel contains ( 150 g ) of water at ( 0^{circ} mathrm{C} ). Then the air from the vessel is pumped out adiabatically. A fraction of water turns into ice and the rest evaporates at ( 0^{circ} mathrm{C} ) itself. The mass of evaporated water will be closest to: (Latent heat of vaporization of water ( = ) ( 2.10 times 10^{6} J k g^{-1} ) and Latent heat of Fusion of water ( left.=mathbf{3 . 3 6} times mathbf{1 0}^{mathbf{5}} mathbf{J} mathbf{k g}^{-mathbf{1}}right) ) A . ( 130 g ) B. ( 35 g ) c. ( 20 g ) D. ( 150 g ) | 11 |

667 | Two monatomic ideal gases 1 and 2 of molecular masses ( m_{1} ) and ( m_{2} ) respectively are enclosed in separate containers kept at the same temperature. The ratio of the speed of sound in gas 1 to that in ( operatorname{gas} 2 ) is given by. A ( cdot sqrt{frac{m_{1}}{m_{2}}} ) B. ( sqrt{frac{m_{2}}{m_{1}}} ) ( mathbf{c} cdot frac{m_{1}}{m_{2}} ) D. ( frac{m_{2}}{m_{1}} ) | 11 |

668 | Which of the following is not a valid reason for using cotton clothes in Summer? A. cotton clothes attract cool air B. cotton clothes absorb sweat from the body c. cotton exposes the sweat to atmosphere for evaporation D. cotton is light in weight | 11 |

669 | For the construction of a thermometer one of the essential requirements is a thermometric substance which A. remains liauid over the entire range of temperatures to be measured B. has a property that varies linearly with temperature c. has a property that varies with temperature D. obey Boyle’s law | 11 |

670 | If one mole of an ideal gas goes through the process ( A rightarrow B ) and ( B rightarrow C . ) Given that ( T_{A}=400 K, ) and ( T_{c}=400 K . ) If ( frac{P_{A}}{P_{B}}=frac{1}{5}, ) then find the heat supplied to the gas. A . 2059.2 J в. 3659.23 c. 2225.2 J D. 2659.23 | 11 |

671 | (i) It is observed that the temperature of the surroundings starts falling when the ice in a frozen lake starts melting. Give a reason for the observation. (ii) How is the heat capacity of the body related to its specific heat capacity? | 11 |

672 | In the absence of intermolecular forces of attraction, the observed pressure ( mathrm{P} ) will be: ( A cdot P ) B. p ) | 11 |

673 | Specific heat capacity of a substance ( A ) is ( 3.8 J g^{-1} K^{-1} ) and of substance ( B ) is ( 0.4 J g^{-1} K^{-1} ) is a good conductor of heat? ( A cdot A ) B. B c. both A & B are equally good D. cant say | 11 |

674 | The Universal gas constant may be expressed as: a) ( 8.31 mathrm{J} / mathrm{mole}-mathrm{K} ) c) ( 2.00 mathrm{J} / mathrm{mole}-mathrm{K} ) b) 8.31 cal/mole-K d) 2.00 cal/mole-K A . a, в. а, ( c cdot b, c ) D. b, | 11 |

675 | ( 2 mathrm{kg} ) of ice at ( -20^{circ} mathrm{C} ) is mixed with ( 5 mathrm{kg} ) of water at ( 20^{circ} C ) in an insulating vessel having a negligible heat capacity Calculate the final mass of water in the | 11 |

676 | surface absorbs more heat than any other surface under identical conditions. A. White & Shiny B. White & Rough c. Black & Rough D. Yellow & Shiny | 11 |

677 | If the temperature of a Black body increases by ( 50 % ) then amount of radiation emmitted by it in a given time interval will A. Increase by ( 800 % ) B. Increase by 400% c. Increase by 200% D. Increase by 1600% | 11 |

678 | The graph ( A B ) shown in the figure is plot of the temperature of a body in degree Celsius and degree Fahrenheit Then A. Slope of line ( A B ) is ( 9 / 5 ) 3. Slope of line ( A B ) is ( 5 / 9 ) C. Slope of line ( A B ) is ( 1 / 9 ) Slope of line ( A B ) is ( 3 / 9 ) | 11 |

679 | The specific latent heat of fusion of ice is: A ( cdot 4.2 J g^{-1} 0 C^{-1} ) B. 4200 Jkg ( ^{-10} C^{-1} ) c. з36 ( J g^{-1} ) D. 336,000 Jg ( ^{-1} ) | 11 |

680 | Explain, why dogs pant during hot summer days using the concept of evaporation? | 11 |

681 | Two holes of unequal diameters ( d_{1} ) and ( boldsymbol{d}_{2}left(boldsymbol{d}_{1}>boldsymbol{d}_{2}right) ) are cut in a metal sheet. If the sheet is heated A. both ( d_{1} ) and ( d_{2} ) will decrease B. both ( d_{1} ) and ( d_{2} ) will increase c. ( d_{1} ) will increase, ( d_{2} ) will decrease D. ( d_{1} ) will decrease, ( d_{2} ) will increase | 11 |

682 | The quantity of heat absorbed by a substance during the change of its state without rising its temperature is called latent heat. A. True B. False | 11 |

683 | Corresponding to a given temperature, there is a wavelength ( lambda_{m}, ) for which the intensity of heat radiations is A. maximum B. constant c. zero D. minimum | 11 |

684 | Two absolute scales ( A ) and ( B ) have triple points of water defined to be 200 A and ( 300 mathrm{B} ) (given triple point of water is ( = ) 276.16 K). The relation between ( T_{A} ) and ( T_{B} ) is A ( cdot T_{A}=T_{B} ) В ( cdot T_{B}=frac{3}{2} T_{A} ) c. ( _{T_{B}}=frac{2}{3} T_{A} ) D. ( T_{B}=frac{3}{4} T_{A} ) | 11 |

685 | The gas thermometer are more sensitive than liquid thermometers because gases A. expand more than liquid B. are easily obtained c. are much lighter D. do not easily change their states | 11 |

686 | The radiation from the sun, incident normally at the surface of the earth is ( 20 k c a l / m^{2} ) min. What would be the radiant energy incident normally on the earth if the sun had a temperature, twice of the present one? A. ( 80 k c a l / m^{2} min ) B . ( 320 k c a l / m^{2} min ) c. ( 160 k c a l / m^{2} ) min D. ( 40 k c a l / m^{2} ) min | 11 |

687 | At ( 27^{0} ) C certain gas occupied a volume Of 4 litres. If the volume of this is to be increased to 12 litres at the same pressure, the gas is to be heated to a temperature A. 300 K B. ( 900 mathrm{K} ) ( mathbf{C} .600 mathrm{K} ) D. ( 1200 K ) | 11 |

688 | The density of air at N.T.P. is ( 1.293 mathrm{gm} / mathrm{lit} ). If the pressure is tripled keeping its temperature constant its density becomes A. ( 3.87 g m / l t r ) B. ( 1.293 g m / l t r r ) c. ( 2.586 g m / l t r ) D. ( 0.431 g m / l t r r ) | 11 |

689 | If the specific heat of lead is ( 0.03 frac{c a l}{g^{o} C} ) thermal capacity of ( 500 mathrm{g} ) of lead is. A . ( 5 mathrm{cal}^{circ} C^{-1} ) B . ( 10 mathrm{cal}^{circ} mathrm{C}^{-1} ) C . ( 15 mathrm{cal}^{circ} mathrm{C}^{-1} ) D. 20cal ( ^{circ} C^{-1} ) | 11 |

690 | If there is rise of melting point then latent heat required would be Complete the sentence | 11 |

691 | Name the process by which you receive heat from sun. A. thermal radiation B. conduction c. convention D. none of these | 11 |

692 | If we switch on a fan heater, it blow hot air through a grille into the room, then A. Cold air rises upwards B. Hot air rises upwards C. Neither A nor B D. None | 11 |

693 | Does a substance that heats up quickly have a high or a low specific heat capacity? | 11 |

694 | 1 g of ice at ( 0^{circ} mathrm{C} ) is supplied with ( 500 mathrm{J} ) of heat energy. Explain the temperature change of material | 11 |

695 | The ratio of densities of two substances is 2: 3 and that of specific heats is 1: 2 The ratio of thermal capacities per unit volume is A ( cdot 1: 2 ) B. 2:1 ( c cdot 1: 3 ) D. 3: | 11 |

696 | Calculate the quantity of heat required to convet ( 1.5 mathrm{kg} ) of ice at ( 0^{circ} mathrm{C} ) to water at ( mathbf{1 5}^{o} boldsymbol{C} cdotleft(boldsymbol{L}_{boldsymbol{i c e}}=mathbf{3 . 3 4} timesright. ) ( left.mathbf{1 0}^{mathbf{5}} boldsymbol{J k g}^{-mathbf{1}}, boldsymbol{C}_{boldsymbol{w a t e r}}=mathbf{4 1 8 0} boldsymbol{J} boldsymbol{k g}^{-mathbf{1} o} boldsymbol{C}^{-mathbf{1}}right) ) A ( .5 .85 times 10^{5} J ) В. ( 5.95 times 10^{5} J ) c. ( 3.95 times 10^{5} J ) D. ( 4.95 times 10^{5} J ) | 11 |

697 | An ideal gas is that which A. Cannot be liquified B. Can be easily liquified C. Has strong inter molecular forces D. Has a large size of molecules | 11 |

698 | When the temperature of body is equal to that of atmosphere, then A. Heat transfer will take place between body and atmosphere B. There is no exchange of heat C. The body is in unstable equilibrium D. None of the above | 11 |

699 | Specific heat capacity of substance ( boldsymbol{A} ) is ( 3.8 J g^{-1} K^{-1} ) whereas the Specific heat capacity of substance ( B ) is ( mathbf{0 . 4} boldsymbol{J} boldsymbol{g}^{-1} boldsymbol{K}^{-1} ) (i) Which of the two is a good conductor of heat? (ii) How is one led to the above conclusion? (iii) If substances ( A ) and ( B ) are liquids then which one would be more useful in car radiators? | 11 |

700 | Define the term specific latent heat of fusion of ice. State its S.I. unit. | 11 |

701 | Time taken by a ( 836 W ) heater to heat one litre of water from ( 10^{0} C ) to ( 40^{0} C ) is: A . ( 50 s ) B. 100 s c. ( 150 s ) D. 200 | 11 |

702 | Heat is a form of energy. A. True B. False | 11 |

703 | A solid sphere of radius ( r ) and mass ( m ) is spinning about a diameter as axis with a speed ( omega_{0} . ) The temperature of the sphere increases by ( 100^{circ} mathrm{C} ) without any other disturbance. If the coefficient of linear expansion of material of sphere is ( 2 times 10^{-4} /^{circ} C, ) the ratio of angular speed at ( 100^{circ} mathrm{C} ) and ( omega_{0} ) is A . 1: B. 1: 1.04 ( c cdot 1.04: ) D. 1:1.02 | 11 |

704 | Which of the following process does not occur through convection A. boiling of water B. land breeze and sea breeze c. circulation of air around furnace D. heating of glass bulb through filament | 11 |

705 | Assertion Air is a bad conductor of heat. Reason It’s molecules are in continuous contact with each other. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

706 | Iron glows in red colour when it is heated to very high temperature. The reason for this is : A. Heat we supply consumes red colour at high temperature B. Mechanical energy is being converted into heat energy c. All metals glow in red colour when heated D. Heat energy is being converted into light energy | 11 |

707 | A wooden spoon is dipped in a cup of ice cream. It’s another end A. Become cold by the process of conduction B. Become cold by the process of convection C. Become cold by the process of radiation D. Does not become cold | 11 |

708 | The temperature of a metal coin is increased by ( 100^{circ} mathrm{C} ) and its diameter increases by ( 0.15 % ). Its area increases by nearly: A . 0.15% B. 0.60% c. 0.30% D. 0.0225% | 11 |

709 | Choose the correct statement from the following: This question has multiple correct options ( mathbf{A} cdot 50^{circ} mathrm{C} ) is equal to ( 122^{circ} mathrm{F} ) B. A clinical thermometer cannot be sterilized using boiling water. C. Unequal expansion causes cracks in the walls of the buildings. D. Graphite is a bad conductor of heat. | 11 |

710 | Why is convection not significant in solids? A. Due to crystalline structure of solids, their density does not change B. Impurities in solids gain the energy from convection. C. Molecules of solids vibrate while moving from one part to other D. Molecules of solids are tightly bound and not free to move. | 11 |

711 | When ( 0.4 mathrm{kg} ) of brass at ( 100^{circ} mathrm{C} ) is dropped into ( 1 mathrm{kg} ) of water at ( 20^{circ} mathrm{C} ), the final temperature is ( 23^{circ} mathrm{C} ). Find the specific heat of brass. ( mathbf{A} cdot 307 J k g^{-1}^{o} C^{-1} ) В. 407 Jkg( ^{-1} ) о ( C^{-1} ) c. ( 507 J k g^{-1} circ C^{-1} ) D. 607 Jkg( ^{-1} ) o ( C^{-1} ) | 11 |

712 | One calorie is defined as the heat required to raise the temperature of 1 ( mathrm{gm} ) of water by ( 1^{circ} mathrm{C} ) in a certain interval of temperature and at certain pressure. The temperature interval and pressure is? A ( cdot 13.5^{circ} mathrm{C} ) to ( 14.5^{circ} mathrm{C} & 76 mathrm{mm} ) of ( mathrm{Hg} ) B . ( 6.5^{circ} mathrm{C} ) to ( 7.5^{circ} mathrm{C} & 76 mathrm{mm} ) of ( mathrm{Hg} ) C. ( 14.5^{circ} mathrm{C} ) to ( 15.5^{circ} mathrm{C} & 760 mathrm{mm} ) of ( mathrm{Hg} ) D. ( 98.5^{circ} mathrm{C} ) to ( 99.5^{circ} mathrm{C} & 760 mathrm{mm} ) of ( mathrm{Hg} ) | 11 |

713 | A black body has a wavelength of ( lambda ) at temperature ( 2000 K . ) Its corresponding wavelength at temperature ( 3000 K ) will be: A ( cdot frac{2 lambda}{3} ) в. ( frac{3 lambda}{2} ) c. ( frac{4 lambda}{9} ) D. ( frac{9 lambda}{4} ) | 11 |

714 | How much heat is required to raise the temperature of 100 g of water of ( 5^{circ} mathrm{C} ) to ( 95^{circ} mathrm{C} ? ) A. 900 kcal B. 90 kcal c. 10 kcal D. 9 kcal | 11 |

715 | Two gases A&B having same pressure ( P ) volume ( V ) and absolute temperature T are mixed. If the mixture has volume and temperature as ( vee & ) T respectively then the pressure of mixture is ( A cdot 2 P ) B. ( c cdot P / 2 ) D. ( 4 P ) | 11 |

716 | How much will a bar of aluminium ( 100 mathrm{cm} ) long, expand when heated from ( 20^{circ} C ) to ( 100^{circ} C ? ) Coefficient of linear expansion of aluminium is ( 2.5 times ) ( 10^{-5} C^{-1} ) | 11 |

717 | A cotton sheet is ironed with hot electricity. How is energy transferred through the metal base of the iron to the sheet? A. by conduction only B. by convection only c. by radiation only D. by convection and radiation only | 11 |

718 | A mass of stainless steel spoon is 0.04 kg and specific heat is ( 0.50 k J / k g times^{o} C ) Then calculate the heat which is required to raise the temperature ( 20^{circ} C ) to ( 50^{circ} mathrm{C} ) of the spoon. A. 200 J B. 400 c. ( 600 mathrm{J} ) D. 800 E . 1,000 | 11 |

719 | Assertion: P-V graph (at constant temperature) for ideal gas is rectangular parabola Reason: Ideal gas obeys Charle’s law A. Both assertion (A) and reason (R) are correct and R gives the correct explanation B. Both assertion (A) and reason (R) are correct but R doesnt give the correct explanation C. A is true but R is false D. A is false but R is true | 11 |

720 | The temperature (T) of one mole of an ideal gas varies with its volume (V) as ( boldsymbol{T}=-boldsymbol{alpha} boldsymbol{V}^{3}+beta boldsymbol{V}^{2}, ) where ( boldsymbol{alpha} ) and ( boldsymbol{beta} ) are positive constants. The maximum pressure of gas during this process is A ( cdot frac{alpha beta}{2 R} ) B. ( frac{beta^{2} R}{4 alpha} ) c. ( frac{(alpha+beta) R}{2 beta^{2}} ) D. ( frac{alpha^{2} R}{2 beta} ) | 11 |

721 | ( 200 mathrm{g} ) of hot water at ( 80^{0} mathrm{C} ) is added to 300 g of cold water at ( 10^{0} ) C. Neglecting the heat taken by the container, calculate the final temperature of the mixture of water. Specific heat capacity of water ( =4200 mathrm{J} mathrm{kg}^{-1} mathrm{K}^{-1} ) | 11 |

722 | The figure shows a cross-section of a double glass unit of a window on a vertical wall. A graph of the temperatures at different points within the unit is shown next to it. The temperature difference across the unit is 13 K. It has a cross-sectional are of 1.3 and the rate of heat flow through it is 65 W. Then the correct statement is (Glass has a thermal conductivity of ( mathbf{1} W boldsymbol{m}^{-1} boldsymbol{K}^{-1} boldsymbol{)} ) A. The unit is in steady state and in thermal equilibrium. B. The unit is in steady state but not in thermal equilibrium C. The unit is not in steady state but is in thermal equilibrium. D. The unit neither in steady state not in thermal equilibrium. | 11 |

723 | If ( 100 mathrm{J} ) of heat is needed to completely change the substance from a solid to a liquid state, what is the heat of fusion for the substance? A ( cdot 1,000 mathrm{J} / mathrm{kg} ) B. ( 100 mathrm{J} / mathrm{kg} ) ( c cdot 50 J / k g ) D. 20 J/kg E. 5 J/kg | 11 |

724 | The intensity of radiation emitted by to ( operatorname{star} A A ) and ( B ) are in the ratio of 16: 1 The wavelength corresponding to their peak emission of radiation will be the ratio of : A .2: 1 B . 4: 1 c. 1: 2 D. 16: 1 | 11 |

725 | Explain the following: (a) A chimney smokes when a fresh fire is started under it. (b) Small holes are provided at the bottom of the chimney in an oil lamp. (c) Land becomes warmer than water during the day. | 11 |

726 | There are two lead spheres at the same temperature, the ratio of radii being 1 2. The ratio of heat capacities are: A ( cdot 1: 2 ) B. 1: 4 ( c cdot 1: 6 ) D. 1: 8 | 11 |

727 | The molar specific heat of the process ( boldsymbol{V} propto boldsymbol{T}^{4} ) for ( boldsymbol{C} boldsymbol{H}_{4} ) gas at room temperature is: ( A cdot 4 R ) B. 7R ( c . ) зв D. 8R | 11 |

728 | State True or False : More we increase the temperature, more is the thermal expansion of solids. A. True B. False | 11 |

729 | A ( 90 mathrm{cm} ) long barometer tube contains some air above the mercury. The reading is ( 74.5 mathrm{cm} ) when the true pressure is ( 76 mathrm{cm} ) at the temperature ( 15^{0} C . ) If the reading is observed to be ( 75.8 mathrm{cm} ) on a day when the temperature is ( 5^{0} C ), then the true pressure is: A. ( 77.38 mathrm{cm} ) of ( mathrm{Hg} ) B. 75.8 cm of Hg c. ( 74 mathrm{cm} ) of ( mathrm{Hg} ) D. ( 80 mathrm{cm} ) of ( mathrm{Hg} ) | 11 |

730 | ( 200 g ) of a cold ball at ( 20^{circ} mathrm{C} ) is dropped in an equal amount of water at ( 80^{circ} mathrm{C} ). The resulting temperature is ( 60^{circ} mathrm{C} ). This means that specific heat of solid is. A. One fourth of water B. One half of water C. Twice of water D. Four times of water | 11 |

731 | When the temperature of an iron sphere of mass ( 1 k g ) falls from ( 30^{circ} C ) to ( 25^{circ} C ) then 550 cal of heat is released. The heat capacity of the iron sphere will be in ( left.operatorname{cal}^{circ} C^{-1}right) ) A . 440 в. 330 ( c cdot 220 ) D. 110 | 11 |

732 | A block of mass ( 100 g ) slides on a rough horizontal surface. If the speed of the block decreases from ( 10 mathrm{m} / mathrm{s}^{-1} ) to ( 5 m / s^{-1}, ) the thermal energy developed in the process is: A . ( 3.75 J ) B. 37.5 ( J ) c. 0.375 J D. ( 0.75 J ) | 11 |

733 | The rate at which a body radiates heat depends on- A. its temperature B. its colour c. its nature (dull or shiny) D. all of these | 11 |

734 | Assertion:PV/T=constant for 1 mole of gas. This constant is same for all gases. Reason: 1 mole of different gases at ( mathrm{NTP} ) Occupy same volume of 22.4 litres. A. Both assertion (A) and reason (R) are correct and R gives the correct explanation B. Both assertion (A) and reason (R) are correct but R doesnt give the correct explanation C. A is true but R is false D. A is false but R is true | 11 |

735 | How much heat energy in joules must be supplied to 14 gms of nitrogen at room temperature to rise its temperature by ( 40^{circ} mathrm{C} ) at constant pressure? (Mol.wt.of ( left.N_{2}=28 g m, R=c o n s t a n tright) ) A ( .50 R ) в. ( 60 R ) ( c .70 R ) D. ( 80 R ) | 11 |

736 | What would be the final temperature of a mixture of ( 50 g ) of water at ( 20^{circ} C ) temperature and ( 50 g ) of water at ( 40^{circ} C ) temperature? | 11 |

737 | Q Type your question two parts are tield together by a ring made of a metal strip of cross-sectional area ( mathrm{S} ) and length L. L is slightly less than ( 2 pi R ). To fit the ring on the wheel, it is heated so that its temperature rises by ( Delta T ) and it just steps over the wheel As it cools down to surrounding temperature, it presses the semicircular parts together. If the coefficient of linear expansion of the metal is ( alpha ) and its Young’s modulus is U, the force that one part of the wheel applies on the other part is? ( mathbf{A} cdot S Y alpha Delta T ) в. ( pi S Y alpha Delta T ) ( mathbf{c} cdot 2 S Y alpha Delta T ) | 11 |

738 | When in thermal contact, the quantity of heat lost by the hotter body is …… the amount of heat gained by the colder body. (neglect loss of heat due to convection & radiation) A. Equal to B. Greater than c. Less than D. cannot say | 11 |

739 | A perfect gas at ( 27^{circ} mathrm{C} ) heated at constant pressure so as to double its volume. The final temperature of the gas will be ( mathbf{A} cdot 327^{0} mathrm{C} ) в. ( 327 K ) ( c cdot 600^{0} c ) D. None | 11 |

740 | If the temperature of the Sun were to increase from ( T ) to ( 2 T ) and its radius from ( R ) to ( 2 R ). The ratio of power radiated by it would become: A. 64 times B. 16 times c. 32 times D. 4 times | 11 |

741 | The diameter of iron wheel is ( 1 mathrm{cm} ). If its temperature is increased by ( 700^{circ} mathrm{C} ) What is the increase in circumference of the wheel? ( left(alpha=12 times 10^{-6} /^{circ} mathrm{C}right) ) A . ( 0.0264 mathrm{cm} ) B. ( 0.264 mathrm{cm} ) c. ( 2.64 mathrm{cm} ) D. ( 26.4 mathrm{cm} ) | 11 |

742 | The perfect gas equation for 4 gram of hydrogen gas is: ( mathbf{A} cdot P V=R T ) B. ( P V=2 R T ) ( ^{mathbf{c}} cdot_{P V}=frac{1}{2} R T ) D. ( P V=4 R T ) | 11 |

743 | Convectional currents are set up, giving rise to : A. Land breezes B. Land clean c. Sea water heated up D. None | 11 |

744 | A black body of mass 34.38 gm and surface area ( 19.2 mathrm{cm}^{2} ) is at an initial temperature of ( 400 mathrm{K} ). It is allowed to cool inside an evacuated enclosure kept at constant temperature ( 300 mathrm{K} ) The rate of cooling is ( 0.04^{circ} mathrm{C} ) per second. The specific heat of the body in ( J k g^{-1} K^{-1} ) is (Stefan’s constant ( sigma= ) ( left.5.73 times 10^{-8} W m^{-2} K^{-4}right) ) A. 2800 в. 2100 ( c cdot 1400 ) D. 1200 | 11 |

745 | Two blocks of steel A and B, A being two times heavier than ( mathrm{B} ), are at ( 40^{circ} mathrm{C} ). The ratio of heat content of ( A ) to ( B ) is: ( A cdot 1 ) B. 4 ( c cdot 2 ) D. | 11 |

746 | Assertion In the warmer liquid, the greater number of molecules are energetic enough to escape the surface during evaporation. Reason Increase in temperature increases the rate of evaporation. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

747 | Rohan wants to test whether a white object or a black object would heat up faster in the Sun. The given picture shows you his experiment. These thermometers were left out in the Sun for 30 minutes. Which of the following statements is | 11 |

748 | Describe an experiment to show that equal volumes of different liquids expand by different amounts for the same rise in temperature. | 11 |

749 | Solar radiation emitted by sun resembles that emitted by a black body at a temperature of ( 6000 K . ) Maximum intensity is emitted at a wavelength of about ( 4800 A ). If the sun was cooled down from ( 6000 K ) to ( 3000 K ) then the peak intensity would occur at a wavelength of : A. 4800 A в. 9600 ( dot{A} ) c. 2400 月 D. ( 19200 dot{A} ) | 11 |

750 | More energetic molecules of a body transfer some of their energy to other molecules, without any change in their position in: A. conduction B. convection c. radiation D. none of these | 11 |

751 | A gas is filed in a rigid container at pressureP ( ^{0} ). If the mass of each molecule is halved Keeping the total number of molecules same and their r.m.s | 11 |

752 | 3 spheres ( A, B ) and ( C ) having radii ( R, 2 R ) and ( 3 R ) respectively are coated with carbon black on their surfaces. The wavelengths corresponding to maximum intensity are 3000,4000 and ( mathbf{5 0 0 0} ) respectively. The power radiated by them are ( Q_{A}, Q_{B} ) and ( Q_{C} . ) Then A ( cdot Q_{A} ) is maximum among all B. ( Q_{B} ) is maximum among all c. ( Q_{C} ) is maximum among all D. ( Q_{A}=Q_{B}=Q_{C} ) | 11 |

753 | Boiling water and steam both have the same temperature ( left(mathbf{1 0 0}^{0} boldsymbol{C}right), ) but steam causes many severe burns than boiling water. Explain | 11 |

754 | Assertion Fahrenheit is the smallest unit measuring temperature. Reason Fahrenheit was the first temperature scale used for measuring temperature. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Reason is correct but Assertion is incorrect D. Both Assertion and Reason are incorrect | 11 |

755 | What is the anomalous expansion? | 11 |

756 | A particular star (assuming it as a black body) has a surface temperature of about ( 5 times 10^{4} ) K.The wave length in nano-meters at which its radiation becomes maximum is : ( (b=0.0029 m K) ) ( A cdot 48 ) B. 58 ( c cdot 60 ) D. 70 | 11 |

757 | Q Type your question ( mathbf{A} ) ( (a) ) ( B ) ( mathbf{C} ) the ( (c) ) ( D ) | 11 |

758 | Why are part of the space shuttles covered with black tiles? A. To allow more loss of heat through the surface. B. To allow less loss of heat through the surface. C. To allow more gain of heat through the surface. D. To allow less gain of heat through the surface. | 11 |

759 | A cylinder contains a gas at temperature of ( 27^{0} mathrm{C} ) and a pressure 1 MPa. If the temperature of the gas is lowered to ( -23^{0} mathrm{C} ), the change in pressure is A. ( 1 mathrm{MPa} ) B. ( 5 / 6 ) MPa C . ( 1 / 6 mathrm{MPa} ) D. ( 5 mathrm{MPa} ) | 11 |

760 | In an experiment, 1.35 mol of oxygen (O2) are heated at constant pressure starting at ( 11.0^{circ} mathrm{C} ). How much heat must be added to the gas to double its volume? A ( cdot 1.12 times 10^{4} J ) В. ( 1.40 times 10^{4} ) c. ( $ $ 2.12 ) ltimes ( 10^{wedge} 4 $ $ ) J D. $$3.12×10^4 J$$ | 11 |

761 | A black body calorimeter filled with hot water cools from ( 60^{circ} mathrm{C} ) to ( 50^{circ} mathrm{C} ) in 4 min and ( 40^{circ} mathrm{C} ) to ( 30^{circ} mathrm{C} ) in 8 min. The approximate temperature of surrounding is : A ( cdot 10^{circ} mathrm{C} ) В. ( 15^{circ} mathrm{C} ) ( mathbf{c} cdot 20^{circ} C ) D. ( 25^{circ} mathrm{C} ) | 11 |

762 | An aluminium block of ( 2 mathrm{m} ) mass and an iron block of ( mathrm{m} ) mass,each absorbs the same amount of heat, and both blocks remain solid. If the specific heat of aluminium is twice the specific heat of iron, then find out the correct statement? A. The increase in temperature of the aluminum block is twice the increase in temperature of the iron block B. The increase in temperature of the aluminum block is four times the increase in temperature of the iron block c. The increase in temperature of the aluminum block is the same as increase in temperature of the iron block D. The increase in temperature of the iron block is twice the increase in temperature of the aluminum block E. The increase in temperature of the iron block is four block | 11 |

763 | For perfect gas, the ratio of volume coefficient of expansion to pressure coefficient is : A. equal to one B. less than one c. more than one D. an imaginary quantity | 11 |

764 | The emissivity of a body of surface area ( 5 c m^{2} ) and radiating ( 300 mathrm{J} ) of energy per minute at temperature ( 727^{circ} C ) is : A. 0.48 B. 0.38 ( c cdot 0.28 ) D. 0.18 | 11 |

765 | Heat travels through vacuum by: A. convection B. radiation c. conduction D. of all these | 11 |

766 | An unknown metal of mass 192 g heated to a temperature of ( 100^{circ} mathrm{cwas} ) immersed into a brass calorimeter of mass ( 128 g ) containing 240 g of water a temperature of ( 8.4^{circ} mathrm{C} ) calculate the specific heat of the unknown metal if water temperature stabilizes at ( 21.5^{circ} c ) (specific heat of brass is ( 394 j K g^{-1} k^{-1} ) A . 1232 J ( k g^{-1} K^{-1} ) B . 458 J ( k g^{-1} K^{-1} ) c. 654 J ( k g^{-1} K^{-1} ) D. 916 J ( k g^{-1} K^{-1} ) | 11 |

767 | Which of the following explains heat transfer by convection? A. When a substance is heated, molecules absorb heat energy and vibrate. When neighbouring molecules collide, energy is transmitted through the material. B. When a substance is heated, molecules absorb heat energy and substance expands. Due to this, density of heated molecules decreases and so they rise upwards taking the heat energy along with them C. Heat radiation is transmitted with the help of waves. D. None of the above | 11 |

768 | An isosceles triangle is formed with rods of length ( L_{1} & L_{2} ) as shown in the figure.The coefficient of linear expansion ( alpha_{1}=2 times 10^{-5} /^{0} C ) and ( boldsymbol{alpha}_{2}=boldsymbol{8} times mathbf{1 0}^{-mathbf{5}} /^{mathbf{0}} boldsymbol{C} ) for the two pieces. If the distance between apex and the midpoint of the base remains unchanged as the temperature is varied, then ( frac{L_{1}}{L_{2}} ) is equal to: | 11 |

769 | Take ( C_{i c e}=0.53 c a l / g-^{circ} C, C_{w a t e r}= ) ( mathbf{1 . 0 c a l} / boldsymbol{g}-^{circ} boldsymbol{C},left(boldsymbol{L}_{f}right)_{text {water}}=mathbf{8 0 c a l} / boldsymbol{g} ) and ( left(boldsymbol{L}_{v}right)_{text {water}}=mathbf{5 2} mathbf{9} ) cal ( / mathbf{g} ). In a container of negligible mass ( 140 g ) of ice initially at ( -15^{circ} mathrm{C} ) is added to ( 200 mathrm{g} ) of water that has a temperature of ( 40^{circ} mathrm{C} ). If no heat is lost to the surroundings, what is the final temperature of system in ( ^{circ} boldsymbol{C} ) ? | 11 |

770 | A closed copper vessel contains water equal to half of its volume when the temperature. Of the vessel is raised to ( 447^{0} mathrm{cthe} ) pressure of steam in the vessel is (Treat steam as an ideal gas, ( mathrm{R}=8310 ) ( mathrm{J} / mathrm{k} / mathrm{mole}, ) density of water ( =1000 mathrm{kg} / mathrm{m}^{3} ) molecular weight of water ( =18 ) ) ( A cdot 33.24 times 10^{7} mathrm{pa} ) B . 16.62 x 10 ( ^{7} ) pa c. ( 10.31 times 10^{7} mathrm{pa} ) D. ( 8.31 times 10^{7} mathrm{pa} ) | 11 |

771 | State whether given statement is True or False Ventilation is an example of convection current in gases. | 11 |

772 | Sprinkling of water reduces temperature of a closed room because A. the temperature of water is less than that of room. B. the specific heat of water is high. C. the water has large latent heat of vaporization. D. water is bad conductor of heat. | 11 |

773 | If you touch the outside surface of the metal container, your hand will become warmer directly by which of the above choices? A. I only B. I and II only c. I and III only D. Il only E . III only | 11 |

774 | ( -40^{circ} ) on absolute scale is equal to ( A cdot ) ok в. ( 233 k ) ( c cdot 273 k ) D. 313K | 11 |

775 | The specific latent heat of fusion of ice is: A ( cdot 4.2 J g^{-1} 0 C^{-1} ) B. 4200 Jkg ( ^{-10} C^{-1} ) c. з36 ( J g^{-1} ) D. 336,000 Jg ( ^{-1} ) | 11 |

776 | Two rods, one of iron and the other of aluminum, are heated to the same temperature difference. If the coefficient of expansion of iron rod is more than that of aluminum, then: A. the iron rod will expand less B. the iron rod will expand more c. both rods will expand equally D. the iron rod will not expand at all | 11 |

777 | The surface of a black body is at a temperature ( 727^{circ} C ) and its cross section in ( 1 m^{2} . ) Heat radiated from this surface in one minute in Joules is (Stefan’s constant ( =mathbf{5 . 7} times ) ( left.mathbf{1 0}^{-8} boldsymbol{W} / boldsymbol{m}^{2} boldsymbol{k}^{4}right) ) A ( cdot 34.2 times 10^{5} ) B . ( 2.5 times 10^{5} ) c. ( 3.42 times 10^{5} ) D. ( 2.5 times 10^{6} ) | 11 |

778 | Thermal radiation is also called A . infrared radiation B. EM radiation c. nuclear radiation D. None | 11 |

779 | Normal temperature of a human body is ( 98.4^{circ} mathrm{F} ). Its value in Celsius scale is ( mathbf{A} cdot 32^{circ} C ) В. ( 37^{circ} mathrm{C} ) ( c cdot 28^{circ} C ) D. ( 48^{circ} mathrm{C} ) | 11 |

780 | ( 20 g ) of ice and ( 20 g ) of hot water are mixed, when the ice is melted the temperature of the mixture was found to be ( 0^{circ} mathrm{C} ). The temperature of hot water taken should be ( left(L_{i c e}=80 mathrm{cal} / mathrm{g}right) ) A ( cdot 40^{circ} mathrm{C} ) B . ( 72^{0} C ) ( mathbf{c} cdot 80^{circ} C ) D. ( 96^{circ} C ) | 11 |

781 | Distance between sun and earth is ( 2 times ) ( 10^{8} mathrm{km}, ) temperature of sun ( 6000 mathrm{K} ) radius of ( operatorname{sun} 7 times 10^{5} mathrm{km}, ) if emissivity of earth is ( 0.6, ) then find out temperature of earth in thermal equilibrium. A . 400 к в. 300 к ( c .500 k ) D. 600 к | 11 |

782 | Two cubes, one silver and one iron, have the same mass and temperature. A quantity Q of heat is removed from each cube which of the following properties do not causes the final temperature of the cubes to be different? This question has multiple correct options A. Density B. Specific heat capacity c. volume D. Mass | 11 |

783 | Explain why is oil preferred over water for frying? | 11 |

784 | A vessel is filled with an ideal gas at a pressure of 10 atmospheres and temp ( 27^{circ} ) C. Half of the mass of the gas is removed from the vessel & the temp. of the remaining gas is increased to ( 87^{0} mathrm{C} ). Then the pressure of the gas in the vessel will be ( A cdot 5 ) atm B. 6 atm c. 7 atm ( D cdot 8 operatorname{atm} ) | 11 |

785 | Two students ordered tea in a restaurant and wanted for a friend who was to join them shortly. One of them poured hot tea in his cup and mixed cold milk in it and the other poured hot tea but mixed the cold milk only after the friend came after five minutes. Now the temperature of the cup of tea of the A. Second student is higher B. Both student is same c. First student is higher D. First student is less by ( 20 mathrm{c} ) that of the second student | 11 |

786 | In general, capacity A. conductors B. Insulators c. cant say D. None of these | 11 |

787 | Change each of the given temperature to the Celsius and Kelvin scales: ( 68^{circ} F, 5^{circ} F ) and ( 176^{circ} F ) | 11 |

788 | The quantity of heat required to raise the temperature of unit mass of a substance through one degree Celsius is known as A. Heat Capacity of body B. Specific heat capacity of a body c. Latent heat of body D. Specific latent heat of a body | 11 |

789 | Match the following two columns. | 11 |

790 | Method of separation by sublimation is limited. A . True B. False | 11 |

791 | A drilling machine of power ( boldsymbol{P} ) watt is used to drill a hole in copper block of mass ( M ) kg. If the specific heat of copper is ( s J k g^{-1} o C^{-1} ) and ( 40 % ) of the power is lost due to heating of the machine, the rise in the temperature of the block in ( T ) seconds will be (in ( ^{o} C ) ) A ( cdot frac{0.6 P T}{M s} ) в. ( frac{0.6 P}{M s T} ) c. ( frac{0.4 P T}{M s} ) D. ( frac{0.4 P}{M s T} ) | 11 |

792 | A long cylindrical vessel of volume and linear coefficient of expansion ( alpha ) contains a liquid. The level of liquid has not changed on heating.The volume coefficient of real expansion of liquid is A. ( frac{V-a}{V} ) B. ( frac{V+a}{V} ) c. ( frac{v}{V-a} ) D. 3a | 11 |

793 | Two gases ( A ) and ( B ) having same pressure P, volume ( V ) and temperature ( T ) are mixed. if the mixture has volume and temperature as ( mathrm{V} ) and ( mathrm{T} ) respectively the pressure of mixture is ( A cdot 2 P ) B. ( c cdot P / 2 ) D. ( 4 P ) | 11 |

794 | Two blocks of steel ( A ) and ( B ) of the same shape and size, A being two times heavier than ( mathrm{B} ), are at ( 40^{circ} mathrm{C} ). The ratio of heat content of ( A ) to ( B ) is A . 1 B. 4 ( c cdot 2 ) D. | 11 |

795 | 1 calorie is equal to A. 2.18 joules B. 3.18 joules C. 4.18 joules D. 5.18 joules | 11 |

796 | The water equivalent of a calorimeter is 10g and it contains 50g of water at ( 15^{circ} ) C. Some amount of ice, initially at ( -10^{circ} ) ( mathrm{C} ) is dropped in it and half of the ice melts till equilibrium is reached. What was the initial amount of ice that was dropped (when specific heat of ice ( = ) 0.5cal ( g m^{-1} o^{-1} ), specific heat of water ( =1.0 ) cal ( g m^{-1 o} C^{-1} ) and latest heat of melting of ice ( =mathbf{8 0} ) cal ( boldsymbol{g m}^{-1} ) )? A . 108 B. ( 18 g ) ( mathbf{c} cdot 20 g ) D. 30g | 11 |

797 | What is the name of the process of heat transfer using electromagnetic waves? A. Conduction B. Convection c. Evaporation D. Radiation | 11 |

798 | A temperature difference of ( 27^{circ} mathrm{C} ) on the Kelvin scale is A . 27 B. 300 K c. ( -246 K ) D. zero | 11 |

799 | If there were no atmosphere around the earth, the temperature of the earth will A. Increase B. Decrease c. Increase during day and decrease during night D. Remain unaffected | 11 |

800 | Two liquids of specific heat ratio 1: 2 are at temperature ( 2 theta ) and ( theta ) This question has multiple correct options A. if equal amounts of them are mixed, then temperature of mixture is 1.56 B. if equal amounts of them are mixed,then temperature is ( frac{4}{3} theta ) C. for their equal amounts, the ratio of heat capacities is 1: 1 D. For their equal amounts, the ratio of their heat capacities is 1: 2 | 11 |

801 | State whether given statement is True or False To prevent heat conduction to our hands, handle of cooking vessels are made of bad conductors. A. True B. False | 11 |

802 | How is the velocity of thermal radiations ( ( v ) ) related to the velocity of light ( (c) ? ) ( mathbf{A} cdot vc ) ( mathbf{c} cdot v=c ) D. the relation depends upon the wavelength of the radiations | 11 |

803 | If ( T ) represents the absolute temperature of an ideal gas, the volume coefficient of thermal expansion at constant pressure is proportional to: A. ( T ) B ( cdot T^{2} ) ( c cdot 1 / T ) D. ( 1 / T^{2} ) | 11 |

804 | Assertion Latent heat of fusion of ice is ( mathbf{3 3 6 0 0 0} boldsymbol{J} boldsymbol{k g}^{-mathbf{1}} ) Reason Latent heat refers to heat required to change of state without any change in temperature. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

805 | A gas in an airtight container is heated from ( 25^{circ} mathrm{C} ) to ( 90^{circ} mathrm{C} ). The density of gas will A. increase slightly B. increase considerably c. remain the same D. decrease slightly | 11 |

806 | A given amount of a gas is heated till the volume and pressure both increase by ( 2 % ) each the percentage change in temperature of the gas is equal to nearly A . ( 2 % ) B. 3% c. ( 4 % ) D. 1% | 11 |

807 | Steam at ( 100^{circ} mathrm{C} ) is passed into 20 g of water acquires a temperature of ( 80^{circ} mathrm{C} ) the mass of water presents will be [Take specific heat of water 1 cal ( g^{-1} c^{-1} ) latent heat of steam ( left.=$ $ 540 text { lcal } mid g^{wedge}{-1} $ $right] ) A. ( 31.5 g ) в. ( 42.5 g ) c. ( 22.5 g ) D. ( 24 g ) | 11 |

808 | A bucket full of hot water is kept in a room and it cools from ( 75^{circ} mathrm{C} ) to ( 70^{circ} mathrm{C} ) in ( T_{1} ) minutes, from ( 70^{circ} C ) to ( 65^{circ} C ) in ( T_{2} ) minutes and from ( 65^{circ} mathrm{C} ) to ( 60^{circ} mathrm{C} ) in ( T_{3} ) minutes. Then A. ( T_{1}=T_{2}=T_{3} ) в. ( T_{1}<T_{2}T_{2}>T_{3} ) D. ( T_{1}T_{3} ) | 11 |

809 | it is a process in which a solid substance is directly converted into its vapours by application of heat and vapour is reconverted into solid by subsequent cooling. The method is used when one of the components undergoes sublimation and other components are not decomposed by heating. F or example, naphtha – | 11 |

810 | A physicist took a hollow metallic sphere of radius ( 4 mathrm{cm} ) at a temperature of ( 27^{circ} mathrm{C} . ) He heated metallic sphere up to ( 127^{circ} mathrm{C} ) and found that diameter of the sphere increased to ( 8.2 mathrm{cm}, ) then what is the coefficient of real expansion. | 11 |

811 | A hot body, obeying Newton’s law of cooling is cooled down from its peak value ( 80^{circ} C ) to an ambient temperature of ( 30^{circ} C . ) It takes 5 minutes in cooling down from ( 80^{circ} mathrm{C} ) to ( 40^{circ} mathrm{C} ). How much time will it take to cool down from ( 62^{circ} mathrm{C} ) to ( 32^{circ} mathrm{C} ? ) (Given ( ln 2=0.693, ln 5=1.609) ) A. 9.6 minutes B. 3.75 minutes c. 8.6 minutes D. 6.5 minutes | 11 |

812 | The propagation of heat in vacuum takes place by A. Conduction B. Convection c. Radiation D. None of these | 11 |

813 | A hole in a metal plate heating. | 11 |

814 | depends on mass and kind of material of the body. | 11 |

815 | Select the option which describes the best definition of heat in the context of thermal energy? A. energy possessed by a system due to movement of particles within the system B. the measure of thermal energy C. thermal energy transferred from one object to another D. energy possessed by an object due to the temperature of the object E . potential energy | 11 |

816 | When without change in temperature, a gas is forced in a smaller volume, its pressure increases because its molecule : A. strike the unit area of the container, wall more often B. strike the unit area of the container, wall more at higher speed c. strike the unit area of the container, wall with greater force D. have more energy | 11 |

817 | Which would most likely cause a greater burn would if applied to someone’s skin: A: 100 grams of water at the boiling point or B: 100 grams of steam at the boiling point and why? A. B: 100 grams of steam would most likely cause a greater wound because it is at a lower temperature B. A: 100 grams of water would most likely cause a greater wound because it is more dense c. в: 100 grams of steam would most likely cause a greater wound because it is at a higher temperature D. A: 100 grams of water would most likely cause a greater wound because it has not yet “boiled away” its heat E. B: 100 grams of steam would most likely cause a greater wound because it gives heat to the skin in changing to liquid; then it gives heat in lowering temperature to that of the skin | 11 |

818 | Choose the correct statement B. ( alpha: beta: gamma:: 2: 3: 1 ) c. ( alpha: beta: gamma:: 3: 1: 1 ) D. ( alpha: beta: gamma:: 1: 2: 3 ) | 11 |

819 | Two identical containers connected by a fine capillary tube contain air at N.T.P. if one of those containers is immersed in pure water, boilling under normal pressure then new pressure is ( A .76 mathrm{cm} ) of ( mathrm{Hg} ) B. 152 ( mathrm{cm} ) of ( mathrm{Hg} ) c. ( 57 mathrm{cm} ) of ( mathrm{Hg} ) D. 87.76 cm of Hg | 11 |

820 | A given amount of gas is heated until both its pressure and volume are doubled. If initial temperature is ( 27^{0} mathrm{C} ), its final temperature is ( A cdot 300 K ) B. 600 K ( c cdot 1200 k ) D. 900K | 11 |

821 | The standard fixed point for temperature measurement is used these days is : A. melting point of ice at S.T.P. B. that temperature at which ice, water and water vapour coexist c. that temperature at which pure ice and pure water coexist D. none of the above | 11 |

822 | The ends ( Q ) and ( R ) of two thin wires, ( P Q ) and ( R S, ) are soldered (joined) together Initially each of the wires has a length of ( 1 mathrm{m} ) at ( 10^{circ} mathrm{C} ). Now the end ( mathrm{P} ) is maintained at ( 10^{circ} mathrm{C} ), while the end ( mathrm{S} ) is heated and maintained at ( 400^{circ} mathrm{C} ). The system is thermally insulated from its surroundings. If the thermal conductivity of wire ( mathrm{PQ} ) is twice that of the wire ( mathrm{RS} ) and the coefficient of linear thermal expansion of PQ is ( 1.2 times ) ( 10^{-5} K^{-1}, ) the change in length of the wire PQ is? ( mathbf{A} cdot 0.78 mathrm{mm} ) в. ( 0.90 mathrm{mm} ) c. ( 1.56 mathrm{mm} ) D. ( 2.34 mathrm{mm} ) | 11 |

823 | The ratio of the latent heat of steam to latent heat of ice A . ( 4 / 9 ) B. 9/4 c. ( 4 / 27 ) D. 27/4 | 11 |

824 | From below expressions, by which heat capacity of a body can be measured? A. Mass of body ( ^{*} ) Specific capacity of body B. Mass of body + Specific capacity of body c. Mass of body / Specific capacity of body D. Mass of body – Specific capacity of body | 11 |

825 | Warmer air is: A. Lighter than cold air B. Heavier than cold air C. Both have equal weights D. We cannot say | 11 |

826 | Three aluminium rods of equal length form an equilateral triangle ( A B C ). Take ( O ) (mid point of ( operatorname{rod} B C ) ) as the origin. The increase in Y-coordinate of center of mass per unit change in temperature of the system is given as ( x times 10^{-6} mathrm{m} /^{circ} mathrm{C} ) Find ( x ). Assume the length of each rod is ( 2 m, ) and ( alpha_{a l}=4 sqrt{3} times 10^{-6} /^{circ} mathrm{C} ) | 11 |

827 | If the thermal capacity of a body is infinity, then which of the following statements are correct? A. Heat can never be added to it B. Heat can never be extracted from it c. The temperature of the body cannot be altered by adding or extracting any amount of heat D. It has infinite amount of heat | 11 |

828 | statement (1): A metallic plate containing a circular hole is heated then the size of the hole increases. statement (2): The expansion of the solid always takes place readily outwards. A. statement 1 and statement 2 are correct and statement 2 is correct an explanation for statement 1 B. statement 1 and statement 2 are correct and statement 2 is not the correct explanation for statement c. statement 1 is true and statement 2 is false D. statement 1 is wrong and statement 2 is true | 11 |

829 | toppr Q Type your question that we receive from the sun is transferred to us by a process which, unlike conduction or convection, does not require the help of a medium in the intervening space which is almost free of particles. Radiant energy travels in space as electromagnetic spectrum. Thermal radiations travel through vacuum with the speed of light. Thermal radiations obey the same laws of reflection and refraction as light does. They exhibit the phenomena of interference, diffraction and polarization as light does. The emission of radiation from a hot body is expressed in terms of that emitted from a reference body (called the black body at the same temperature. A black body absorbs and hence emits radiations of all wavelengths. The total energy E emitted by a unit area of a black body per second is given by ( boldsymbol{E}=boldsymbol{sigma} boldsymbol{T}^{4} ) where ( boldsymbol{T} ) is the absolute temperature of the body and ( sigma ) is a constant known as Stefan’s constant. If the body is not a perfect black body, then ( E=varepsilon sigma T^{4} ) where ( varepsilon ) is the emissivity of the body. The rate at which energy is radiated by | 11 |

830 | Birds glide effortlessly in the air with the help of A. Conduction of heat in the air B. Radiation of light through the atmosphere c. convection currents of air D. More sugar | 11 |

831 | 1 Joule ( = ) ( mathbf{A} cdot 10^{8} )ergs B. ( 10^{6} ) ergs ( mathbf{c} cdot 10^{7} )ergs D. ( 10^{10} ) ergs | 11 |

832 | Convection of heat takes place in: A. Metals only B. Liquids only c. Gases only D. Liquids and gases | 11 |

833 | The surface tension of water at ( 0^{0} C ) is 75.5 ( d y n e / c m . ) Find surface tension of water at ( 25^{0} C ) (a for water ( =mathbf{0 . 0 0 2 1} / mathbf{K} ) ) | 11 |

834 | If the pressure and the volume of certain quantity of ideal gas are halved, then its temperature A . Is doubled B. Becomes one-fourth c. Remains constant D. Become four times | 11 |

835 | Explain why rate of evaporation of an aqueous solution decreases with increase in humidity? | 11 |

836 | What is a Thermostat? | 11 |

837 | Rate of evaporation increases A. with the rise in temperature B. with the fall in temperature C. irrespective of temperature D. only beyond room temperature | 11 |

838 | A lead bullet pertrates into a solid object and melts. Assuming that ( 50 % ) of its kinetic energy was used to heat it, if the initial speed (in ( mathrm{m} / mathrm{s} ) ) of the bullet is ( 100 times 100 times J / K g ) and specific heat capacity of lead ( =125 mathrm{J} / mathrm{kg} mathrm{K} ) | 11 |

839 | State True or False. Latent heat depends on the mass of the substance. | 11 |

840 | Universal gas constant per molecule is called A. Rydberg constant B. Kelvin constant c. Boltzman constant D. Stefan’s constant | 11 |

841 | Heat given (H) to a substance was plotted against rise in temperature ( (boldsymbol{theta}) ) Which of the following parts of the graph, most correctly depicts the latent heat of the substance? ( A cdot A B ) в. вс оп! ( c cdot c D ) D. BC and DE | 11 |

842 | Heat transfer is done by: A. convection B. cooling c. expansion D. none of the above | 11 |

843 | Two absolute scales ( A ) and ( B ) have triple points of water defined to be ( 200 mathrm{A} ) and 350 B. What is the relation between ( boldsymbol{T}_{boldsymbol{A}} ) and ( T_{B} ? ) | 11 |

844 | If the volume of the gas is to be increased by 4 times: A. temperature and pressure must be doubled B. at constant ( P ), the temperature must be increased by 4 times C. at constant ( T ), the pressure must be increased by 4 times D. it cannot be increased | 11 |

845 | You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with well labelled diagram. | 11 |

846 | Suppose a liquid in a container is heated at the top rather than at the bottom. What is the main process by which the rest of the liquid becomes hot ( ? ) A. Conduction B. Evaporation c. Sublimation D. None of these | 11 |

847 | In experiment of convection heat transfer, water inside the pipe can be convectively heated with higher rate by A. Increasing thermal conductivity of container B. increasing heat intensity c. Using external force to increase the circulation speed D. all of the above | 11 |

848 | If a cylinder of diameter ( 1.0 mathrm{cm} ) at ( 30^{circ} mathrm{C} ) is to be slid into a hole of diameter ( 0.9997 mathrm{cm} ) in a steel plate at the same temperature, the minimum required rise in the temperature of the plate is: (Coefficient of linear expansion of ( left.operatorname{steel}=12 times 10^{-6} /^{circ} Cright) ) A ( cdot 25^{circ} mathrm{C} ) В ( cdot 35^{circ} mathrm{C} ) ( mathbf{c} cdot 45^{circ} mathrm{C} ) D. ( 55^{circ} mathrm{C} ) | 11 |

849 | 10 g ice at %%0^{lcirc } c ( mathrm{~ i s c o n v e r t e d i n t o s t e a m a t l o o n { l c i r c } ~} ) .Findtotalheatrequired ( left(mathrm{L}_{-} mathrm{f}=80right. ) cal/G, ( S_{-} w=1 ) cal/g ( wedge{mid c text { irc }} C, L_{v}= ) ( mathbf{5 4 0} c a l / g) ) | 11 |

850 | During an experiment, an ideal gas is found to obey a condition ( frac{boldsymbol{P}^{2}}{boldsymbol{rho}}= ) constant ( [rho=text { density of the gas }] ) The gas is initially at temperature ( T ) pressure ( P ) and density ( rho . ) The gas expands such that density changes to ( frac{rho}{2} ) This question has multiple correct options A. The pressure of the gas changes to ( sqrt{2} P ) B. The temperature of the gas changes to ( sqrt{2} T ) C. The graph of the above process on the P-T diagram is parabola. D. The graph of the above process on the P-T diagram is hyperbola. | 11 |

851 | Choose the correct statements about phase changes. A. When a liquid freezes, it releases thermal energy into its immediate environment B. When a solid melts, it releases thermal energy into its immediate environment C. For most substances, the latent heat of fusion is greater than the latent heat of vaporization D. As a solid melts, its temperature increases E. As a liquid freezes, its temperature decreases | 11 |

852 | A body in a laboratory takes 4 minutes to cool from ( 61^{circ} mathrm{C} ) and ( 59^{circ} mathrm{C} ). If the laboratory temperature is ( 30^{circ} C ) then the time taken by it to cool from ( 51^{circ} mathrm{C} ) to ( 49^{circ} C ) will be: ( A cdot 8 min ) B. 6 min ( c .5 mathrm{min} ) D. 4 min | 11 |

853 | is a process of transfer of heat by the actual movement of the medium particles. A. Conduction B. Convection c. Radiation D. All | 11 |

854 | ( underbrace{E} ) | 11 |

855 | If heat is supplied to a solid, its temperature This question has multiple correct options A. must increase B. may increase c. may remain constant D. may decrease | 11 |

856 | Sublimation process is used: A. to separate mixtures that contain a sublimate with a non-volatile component from a non-sublimate impurity B. to separate mixtures that contain a sublimate with a volatile component from a non-sublimate volatile impurity C. to separate mixtures that contain a sublimate with a volatile component from a non-sublimate impurity D. none of above | 11 |

857 | The convection current continues till the entire medium acquires the density A. Different B. Same c. Both D. None | 11 |

858 | As the air around the base of a candle flame is heated, it rises and is replaced by cooler air due to which of following type of heat transfer? A. Conduction B. convection c. Radiation D. Diffraction E. Latent heat | 11 |

859 | State whether given statement is True or False During the night, land cools faster than | 11 |

860 | Pressure of an ideal gas is increased by keeping temperature constant. The kinetic energy of molecules. A . Decreases B. Increases c. Remains same D. Increases or decreases depending on the nature of gas | 11 |

861 | Wearing black clothes in summer is more preferable. True or false. A. True B. False | 11 |

862 | Use the formula ( lambda_{m} T=0.29 mathrm{cm} mathrm{K} ) to obtain the characteristic temperature ranges for different parts of the electromagnetic spectrum. What do the numbers that you obtain tell you? | 11 |

863 | ( P V=n R T ) holds good for a) Isobaric process b) Isochoric process c) Isothermal process d) Adiabatic process ( A cdot a & b ) B. a,b & ( c cdot a, b & d ) D. all | 11 |

864 | ( 50^{circ} mathrm{C} ) is ( ldots ldots . . . . . . . .^{circ} mathrm{F} ) A . 132 B. 122 ( c cdot 140 ) D. 150 | 11 |

865 | Ice of mass 200 g at ( 0^{circ} mathrm{C} ) is converted to water at ( 0^{circ} mathrm{C} ) in 8 minutes supplying heat to it at a constant rate. Calculate the time taken to raise the temperature of water to ( 100^{circ} mathrm{C} ) with heat provided at the same rate. (take the latent heat of fusion of ice ( =336 J g^{-1 circ} C^{-1} ) and specific heat capacity of water ( = ) ( left.4.2 J g^{-1 circ} C^{-1}right) ) | 11 |

866 | The density of a gas at N.T.P. is ( 1.5 mathrm{gm} / ) lit its density at a pressure of ( 152 mathrm{cm} ) of ( mathrm{Hg} ) and temperature ( 27^{0} mathrm{C} ) A ( cdot frac{273}{100} g m / l t r ) B . ( frac{150}{233} mathrm{gm} / mathrm{ltr} ) ( mathbf{c} cdot frac{1}{273} g m / l t r ) D. ( 1.5 mathrm{gm} / ) lit | 11 |

867 | What extinguishes a fire most quickly? A. Cold water B. Boiling water c. Hot water D. Ice | 11 |

868 | Conduction is: A. the process of transfer of heat which does not require any material medium B. the process of transferring heat from molecule to molecule, without the actual movement of molecules C. the process in which molecules conduct heat by moving from hotter regions to colder regions D. the process in which heat energy moves through the medium of protons | 11 |

869 | Give reason: Birds puff up their feathers in winter A. so that they can trap more air B. so that can develop charge c. cant say D. so that friction reduces | 11 |

870 | A block body radiates heat at temperatures ( T_{1} ) and ( T_{2}left(T_{2}>T_{1}right) . ) The frequency corresponding to maximum energy is A. More at ( T_{1} ) B. More at ( T_{2} ) c. Equal for ( T_{1} ) and ( T_{2} ) D. Independent of ( T_{1} ) and ( T_{2} ) | 11 |

871 | Final volume of the system will be nearly – ( mathbf{A} cdot 6.2 m^{3} ) B . ( 2.8 m^{3} ) c. ( 4.5 m^{3} ) D. ( 1.4 m^{3} ) | 11 |

872 | Which of the following is NOT a Absolute Temperature Scale? A. Celsius Scale B. Rankine Scale c. Kelvin Scale D. None of these | 11 |

873 | S.I unit of Heat Capacity is | 11 |

874 | Identify the statement in which mode of heat transfer is convection? A. The heat of the sun warming our planet B. The heat from an electric stove warming a frying pan c. Ice cubes cooling a drink D. A microwave oven cooking a meal E. An overhead fan cooling a room | 11 |

875 | Bunty mixed 440 gm of ice at ( 0^{circ} mathrm{C} ) with ( 540 mathrm{gm} ) of water at ( 80^{circ} mathrm{C} ) in a bowl. Then what would remain after sometime in the bowl? A . only ice B. only water c. ice and water in same amount D. ice and water will vapourise | 11 |

876 | A vertical column of liquid ( h_{0} ) long at ( 0^{circ} C ) balances another column of same liquid at ( t^{o} C . ) If ( r ) is the absolute expansion of that liquid, height of second liquid column is : ( mathbf{A} cdot h_{0}(1-r t) ) в. ( frac{h_{0}}{(1-r t)} ) c. ( h_{0}(1+r t) ) D. ( frac{h_{0}}{1+r t} ) | 11 |

877 | ( 28 g m ) of ( N_{2} ) gas is contained in a flask at a pressure of 10 atm and at a temperature of ( 57^{0} ) C. It is found that due to leakage in the flask, the pressure is reduced to half and the temperature reduced to ( 27^{circ} mathrm{C} ). The quantity of ( mathrm{N}_{2} ) gas that leaked out is ( mathbf{A} cdot frac{5}{63} g m ) В ( cdot frac{63}{5} g m ) ( mathbf{c} cdot frac{11}{20} g m ) D. ( frac{20}{11} g m ) | 11 |

878 | Normallly the body temperature of healthy person is Degree celcius? | 11 |

879 | How much amount of heat is required to raise the temperature of 100 g of water from ( 30^{circ} mathrm{C} ) to ( 100^{circ} mathrm{C} ? ) The specific heat of water ( =4.2 J g^{-1 o} C^{-1} ) A . 25.5 k B. 29.4 k c. ( 30 k J ) D. 40 kJ | 11 |

880 | State whether ( P_{1}>P_{2} ) or ( P_{2}>P_{1} ) for given mass of a gas? | 11 |

881 | How much work can be done by ( 250 c a l ) of heat? ( mathbf{A} cdot mathbf{0} ) в. 1045 erg c. ( 1045 W ) D. 1045 J | 11 |

882 | A small quantity, mass ( m ), of water at a temperature ( thetaleft(text { in }^{circ} Cright) ) is poured on to a large mass ( M ) of ice which is at its melting point. If ( c ) is specific heat capacity of water and ( L ) the latent heat of fusion of ice, then the mass of ice melted is given by A ( cdot frac{M L}{m c theta} ) в. ( frac{m c theta}{M L} ) с. ( frac{M c theta}{L} ) D. ( frac{m c theta}{L} ) | 11 |

883 | n’ moles of an ideal gas undergoes a process ( A rightarrow B ) as shown in figure. The maximum temperature of the gas during the process will be : A ( cdot frac{9 P_{0} V_{0}}{n R} ) в. ( frac{9 P_{0} V_{0}}{4 n R} ) c. ( frac{3 P_{0} V_{0}}{2 n R} ) D. ( frac{9 P_{0} V_{0}}{2 n R} ) | 11 |

884 | A system is taken from state ( A ) to state B along two different paths 1 and 2 . The work done on the system along these two paths are ( W_{1} ) and ( W_{2} ) respectively. The heat absorbed by the system along these two paths are ( Q_{1} ) and ( Q_{2} ) respectively. The internal energies at ( A ) and ( mathrm{B} ) are ( U_{A} ) and ( U_{B} ) respectively. Then, ( mathbf{A} cdot W_{1}=W_{2}=U_{B}-U_{A} ) в. ( Q_{1}=Q_{2}=U_{A}-U_{B} ) c. ( Q_{1}+W_{1}=Q_{2}+W_{2}=U_{A}+U_{B} ) D. ( Q_{1}+left(-W_{1}right)=Q_{2}+left(W_{2}right)=U_{B}-U_{A} ) | 11 |

885 | at a constant temperature of ( theta ). Assume that it obeys Newton’s law of cooling. Its temperature ( theta ) is plotted against time ( t ) Tangents are drawn to the curve at the points ( boldsymbol{P}left(boldsymbol{theta}=boldsymbol{theta}_{1}right) ) and ( mathrm{Q}left(boldsymbol{theta}=boldsymbol{theta}_{2}right) . ) These tangents meets the time axis at angles of ( phi_{2} ) and ( phi_{1} ) as shown ( mathbf{A} cdot frac{tan phi_{2}}{tan phi_{1}}=frac{theta_{1}-theta_{0}}{theta_{2}-theta_{0}} ) B. ( frac{tan phi_{2}}{tan phi_{1}}=frac{theta_{2}-theta_{0}}{theta_{1}-theta_{0}} ) c. ( frac{tan phi_{1}}{tan phi_{2}}=frac{theta_{1}}{theta_{2}} ) D. ( frac{tan phi_{1}}{tan phi_{2}}=frac{theta_{2}}{theta_{1}} ) | 11 |

886 | A ( 50 ~ k g ) man is runing at a speed of ( 18 k m h^{-1} . ) If all the kinetic energy of the man can be used to increase the temerature of water from ( 20^{0} C ) to ( 30^{0} C ) how much after can be heated with this energy? | 11 |

887 | A bucket full of hot water is kept in a room. It cools from ( 75^{circ} mathrm{C} ) to ( 70^{circ} mathrm{C} ) in ( T_{1} ) minutes, from ( 70^{circ} mathrm{C} ) to ( 65^{circ} mathrm{C} ) in ( T_{2} ) minutes and from ( 65^{circ} mathrm{C} ) to ( 69^{circ} mathrm{C} ) in ( T_{3} ) minutes. Which of the following relation is correct? A. ( T_{1}>T_{2}>T_{3} ) в. ( T_{1}<T_{2}<T_{3} ) c. ( T_{1}T_{3} ) D. ( T_{1}=T_{2}=T_{3} ) | 11 |

888 | A black body is at a temperature of ( 2880 K . ) The radiation energy emitted by this object with wavelength in between ( 499 n m ) and ( 500 n m ) is ( U_{1}, ) between 999 nm and 1000 nm is ( U_{2} ) and between ( 1499 mathrm{nm} ) and ( 1500 mathrm{nm} ) is ( U_{3} . ) If Wein constant is ( 2.8 times 10^{6} mathrm{nmK} ), then A ( cdot U_{1}=0 ) в. ( U_{3}=0 ) ( mathbf{c} cdot U_{1}>U_{2} ) D. ( U_{2}>U_{1} ) | 11 |

889 | Why is the cooling unit of a refrigerator made at the top? | 11 |

890 | Expansion in a substance is A. directly proportional to rise in the temperature B. inversely proportional to rise in the temperature C. independent of rise in temperature D. cannot say | 11 |

891 | Work done in converting 18 of ice at ( -10 mathrm{C} ) into steam at ( 100 mathrm{C} ) is A. 3.04 KJ B. 6.05 KJ c. о.721 к D. 0.616 KJ | 11 |

892 | A container contains 0.25 kg of a liquid at its boiling temperature. If the latent heat of fusion for the liquid is 500 Joules/kg and the latent heat of vaporization for the liquid is 1000 Joules/Kg. How much heat must be added to the liquid to boil all of the liquid away? A ( .125 mathrm{J} ) J. в. ( 2000 J ) c. ( 4000 J ) D. ( 0.50 J ) E . ( 250 J ) | 11 |

893 | The thermos bottles have a highly polished interior made of stainless steel, which makes them almost unbreakable. These thermos bottles also covered with insulated material to keep substances hot by reducing heat loss. Identify which of the following mode of heat transfer is restricted by the insulated material? A. Absorption B. Conduction c. convection D. Radiation E. Evaporation | 11 |

894 | A faulty thermometer has its fixed points marked as ( 3^{circ} ) and ( 120^{circ} . ) The temperature of a body measured by the faulty thermometer is ( 80^{circ}, ) Find the correct temperature of the body on Celsius scale: A ( .36 .5^{circ} mathrm{C} ) B. ( 77.8^{circ} mathrm{C} ) ( mathbf{c} cdot 25.8^{circ} mathrm{C} ) D. ( 66.8^{circ} mathrm{C} ) | 11 |

895 | Find the temperature at which volume and pressure of 28 gm nitrogen gas becomes ( 10 d m^{3} & 2.46 ) atm respectively. (Molar mass of nitrogen ( operatorname{gas}=28 g / m o 1^{-1} ) | 11 |

896 | When body changes its state from liquid to solid, the change is A. endothermic B. exothermic c. neutral D. isobaric | 11 |

897 | An instrument used to measure high temperature is A. Pyrheliometer B. Pyrometer c. Technometer D. Pyknometer | 11 |

898 | If 10 g of ice at ( 0^{circ} mathrm{C} ) mixes with 10 g of water at ( 10^{circ} mathrm{C} ), then the final temperature ( t ) is given by A ( cdot(10 times 80)+10(t-0)=10(10-t) ) в. ( 10 times 80=10(10-t)+10(t-0) ) ( mathbf{c} cdot t=5^{circ} C ) D. ( t=0^{circ} mathrm{C} ) | 11 |

899 | If the specific heat of lead is ( 0.03 operatorname{cal} g^{-1 o} C^{-1}, ) thermal capacity of 500 g of lead is ( mathbf{A} cdot 5 operatorname{cal}^{o} C^{-1} ) B. ( 10 mathrm{cal}^{circ} mathrm{C}^{-1} ) c. ( 15 ~ c a l^{circ} C^{-1} ) D. ( 20 mathrm{cal}^{circ} mathrm{C}^{-1} ) | 11 |

900 | All gasses deviate from gas laws at A. high pressure and low temperature. B. low pressure and high temperature. C. high pressure and high temperature. D. low pressure and low temperature. | 11 |

901 | Boiling water is changing into steam. Under this condition, the specific heat of water is A. zero B. one c. infinite D. less than one | 11 |

902 | Water in lakes and ponds in cold countries does not freeze all at once | 11 |

903 | A solid cylinder of length L and radius ( r ) is heat upto same temperature as that of a cube of edge length a. If both have same material, volume and allowed to cool under similar conditions, then ratio of amount of radiations radiated will be (Neglect radiation emitted from flat surfaces of the cylinder) A ( cdot frac{a}{3 r} ) B. ( frac{2 a}{r L} ) c. ( frac{a^{2}}{r L} ) D. ( frac{pi a^{2}}{2 r L} ) | 11 |

904 | If the slope of P-T graph for a given mass of a gas increases, then the volume of the gas A. Increases B. Decreases C. Does not change D. May increase or decrease | 11 |

905 | Which among ice and water has the higher specific heat capacity? A . Ice B. Water ( c cdot ) both ( A & B ) D. none of the above | 11 |

906 | We have ( 2.0 mathrm{kg} ) of a block of a substance at its melting point. The substance has a latent heat of fusion of ( 1500 J ) per kilogram and a specific heat of ( 2500 J ) per kilogram degree Celsius. How much heat is needed to change the block entirely into a liquid? begin{tabular}{l} A. ( 5000 mathrm{J} ) \ hline end{tabular} B. ( 750 J ) c. ( 1250 J ) D. 3000 ( J ) ह. ( 8000 J ) | 11 |

907 | A thin copper wire length L increases its length by ( 1 % ) heated from temperature ( T_{1} ) and ( T_{2} ) What is the percentage change in area when a thin copper plate having dimension ( 2 mathrm{Lx} ) Lis heated from ( boldsymbol{T}_{1} ) to ( boldsymbol{T}_{2} ) A. ( 0.5 % ) B . 1 % c. ( 2 % ) D. 4 % | 11 |

908 | Two copper rods ( P ) and ( Q ) of thickness in the ratio 2: 5 are taken. If both the rods ( P ) and ( Q ) of length ( 10 mathrm{cm} ) are heated to same temperature rise, then the ratio of the linear expansions of ( P ) to that of rod Q is : A .2: 5 B. 5: 2 c. 1: 1 D. 4: 1 | 11 |

909 | A mercury thermometer is transferred from melting ice to hot liquid.The mercury rises to ( 9 / 10 ) distance between two fixed points. Find the temperature in liquid in Fahrenheit scale A . 198 в. 194 ( c .190 ) D. 188 | 11 |

910 | What is the specific latent heat of the metal? A. ( 50 J g^{-1} ) В. ( 2500 J g^{-1} ) C. ( 5000 J g^{-1} ) D. ( 500 J g^{-1} ) | 11 |

911 | When 1 g of water at ( 100^{circ} mathrm{C} ) gets converted into steam at the same temperature, the change in volume is approximately A ( .1 mathrm{cc} ) B. 1000 ç ( c cdot 1500 mathrm{cc} ) D. 1670 cc | 11 |

912 | Heat always flows from temperature to ( _{-}-_{-}-_{-}- ) temperature | 11 |

913 | ( 5 g m ) of steam at ( 100^{circ} C ) is passed into calorimeter containing liquid, Temperature of liquid rises from ( 32^{circ} C ) to ( 40^{circ} mathrm{C} . ) Then water equivalent of calorimeter and content is A. 40 gram B. 375 gram c. 300 gram D. 160 gram | 11 |

914 | Which one of the following substances has highest specific heat capacity at room temperature and atmospheric pressure? A. water B. Ice c. Aluminium D. Mercury | 11 |

915 | State True or False : Convection currents are set up giving rise to sea breezes. A. True B. False | 11 |

916 | In the expression for Boyle’s law, the product ‘PV’ has dimensions of A. Force B. Impulse c. Energy D. Momentum | 11 |

917 | A body cools in 7 minutes from ( 60^{circ} mathrm{C} ) to ( 40^{circ} mathrm{C} ). If the temperature of surrounding is ( 10^{circ} mathrm{C}, ) the temperature after next 7 minutes will be : ( mathbf{A} cdot 32^{circ} C ) B . ( 38^{circ} mathrm{C} ) c. ( 22^{circ} mathrm{C} ) D. None of these | 11 |

918 | An ideal gas is initially at ( P_{l}, V_{1} ) is expanded to ( P_{2}, V_{2} ) and then compressed adiabatically to the same volume ( V_{l} ) and pressure ( P_{3} ).If ( W ) is the net work done by the gas in complete process which of the A. ( W>0 ; P_{3}>P_{1} ) В. ( WP_{1} ) c. ( WP_{1} ; W<0 ) | 11 |

919 | toppr ( Q ) тур the photosphere) of the star emits radiations of all wavelengths, producing continuous spectrum. When these radiations pass through the outer, relatively cooler, layer of the star, the radiations of certain wavelengths are selectively absorbed by this layer. This explains the dark lines in the spectrum of a star. The dark lines are characteristic of the substances present in the outer layer of the star. The surface temperature T of a star can be estimated by measuring the wavelengths ( lambda_{m} ) at which the intensity of the emitted radiation is maximum and then using Wien’s displacement law which states that ( lambda_{m} times mathrm{T}=mathrm{b} ) where b is a constant called Wien’s constant and the above relation is called Wien’s Displacement Law which states that as the temperature increases, the maximum intensity of emission shifts (or is displaced) towards the shorter wavelengths. The value of constant has been found experimentally to be ( 2.89 times 10^{-3} mathrm{mK} ) Which one of the curves shown in Fig represents the spectral distribution of energy ( E_{lambda} ) of black body radiations where ( lambda ) is the wavelength? 4 B. ( c ) D. | 11 |

920 | Find the temperature at which the fundamental frequency of an organ pipe is independent of small variation in temperature in terms of the coefficient of linear expansion ( (alpha) ) of the material of the tube A . ( 1 / 3 alpha ) B. ( 1 / 2 alpha ) c. ( 1 / 4 alpha ) D. ( 1 / 5 alpha ) | 11 |

921 | The process which are subjected to action of heat in absence of air is called A. Extraction B. Polishing c. Calcination D. None of these | 11 |

922 | The given diagram represents: Total enthalpy of reactants Total enthalpy of products A. Enthalpy diagram for endothermic reaction B. Enthalpy diagram for exothermic reaction C. Enthalpy diagram for reversible reaction D. Enthalpy diagram for non-spontaneous reaction | 11 |

923 | The pressure of a gas filled in a closed vessel increases by ( 0.4 % . ) When temperature is increases by ( 1^{circ} mathrm{C} ) the initial temperature of the gas is ( A cdot 250^{circ} mathrm{C} ) B. 250 K c. ( 250^{circ} mathrm{F} ) D. 2500 ( ^{circ} ) | 11 |

924 | Wool is used in making garments used in winter because A. Wool is a good conductor of heat B. Wool is a bad conductor of heat C. Air, trapped in between the wool fibres, prevents the flow of heat from our body to the cold surroundings. D. Both B and C | 11 |

925 | The specific heat of water is 1 cal ( g^{-1} ) o ( C^{-1} ). Its value in S.I. units is approximately ( A ) B. 4. c. 420 D. 4200 | 11 |

926 | A cold Object ( A ) is placed on top of a hot object ( mathrm{B} ) in a closed system. Identify which of the following is the best description of what occurs in the system? I. Both ( A ) and ( B ) eventually reach the same temperature. Il. Gravity stops heat from moving up into A. III. Heat flows from A to B A. I only B. II only C. I and III only D. II and III only E . ।, II, and III | 11 |

927 | In experiment of convection heat transfer water inside the pipe, completely gets heated (with the application of heat source) can be explained best by which of the following statements, A. Differences in densities produced between the bottom and the top of water, in turn produce the driving buoyant force which continuously circulates the water, B. A continuous conductive channel is produced between the different layers of water in the pipe which circulates the heat c. both the above explains correctly D. all of the above | 11 |

928 | Conduction of heat is possible: A. when the bodies are apart from each other B. when the bodies have same temperature and in thermal contact C. when they have different temperatures maintaining distance between them D. bodies should be in contact and should have different temperatures | 11 |

929 | Give reason as to why woolen clothes are more preferable in winter. | 11 |

930 | How does air trapped by the woolen fabric help? A. Air is a good conductor of heat and allows warm air to come near body B. Air is a bad conductor of heat and allows body heat to escape into atmosphere C. Air is a bad conductor of heat and doesn’t allow body heat to escape into atmosphere D. Air is a good conductor of heat and doesn’t allow cool air to come near body. | 11 |

931 | The thermal radiations are similar to : A . x-rays B. cathode rays c. ( alpha ) – rays D. ( gamma ) – rays | 11 |

932 | When 60 calories of heat are supplied to ( 15 mathrm{g} ) of water, the rise in temperature is A ( cdot 75^{circ} mathrm{C} ) B. ( 900^{circ} mathrm{C} ) ( mathbf{c} cdot 4^{circ} C ) D. ( 0.25^{circ} mathrm{C} ) | 11 |

933 | A liquid A has specific heat capacity higher than the liquid B. Which liquid can be used a heat reservoir to keep juice bottles without freezing? ( A cdot A ) B. B c. Both can be used D. Data insufficient | 11 |

934 | At the top of a mountain a thermo meter read ( 7^{0} mathrm{C} ) and barometer reads ( 70 mathrm{cm} ) of Hg. At the bottom of the mountain the barometer reads ( 76 mathrm{cm} ) of Hg and thermometer reads ( 27^{0} ) C. The density of air at the top of mountains is times the density at the bottom. A . 0.99 B. 0.9 c. 0.89 D. 0.95 | 11 |

935 | Assertion The flow of heat energy from one body to the other depends upon the amount of heat energy in them Reason Heat flows from lower temperature of the body to higher temperature of the body A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 11 |

936 | toppr Q Type your question each piston moves within a particular section. One mole of a gas enclosed between the pistons which are tied with non-stretchable threads. The difference in cross-sectional area of pistons ( 10 mathrm{cm}^{2} ) The mass of gas confined between pistons is ( 5 mathrm{kg} ). The outside pressure is 1 atmosphere ( =10^{5} N / m^{2} ) By how many degrees must the gas between pistons be heated to shift the piston by ( 5 mathrm{cm} ? ) Given ( boldsymbol{R}=mathbf{8 . 3} ) A ( cdot 0.9^{circ} mathrm{C} ) В. ( 1.2^{circ} mathrm{C} ) ( c cdot 1.5^{circ} mathrm{C} ) D. ( 0.5^{circ} mathrm{C} ) | 11 |

937 | A ( 10.0 mathrm{W} ) electrical heater is used to heat a container filled with ( 0.5 mathrm{kg} ) of water. It is found that the temperature of the water and the container rose by 3 K in 15 minutes. The container is then emptied, dried, and filled with ( 2 mathrm{kg} ) of an oil. It is now observed that the same heater raises the temperature of the container-oil system by 2 Kin 20 minutes. Assuming no other heat losses in any of the processes, the specific heat capacity of the oil is?? A ( .2 .5 times 10^{3} J K^{-1} k g^{-1} ) B. ( 5.1 times 10^{3} J K^{-1} k g^{-1} ) c. ( 3.0 times 10^{3} J K^{-1} k g^{-1} ) D. ( 1.5 times 10^{3} J K^{-1} k g^{-1} ) | 11 |

938 | A hole is drilled in a copper sheet. The diameter of the hole is ( 4.24 mathrm{cm} ) at ( 27.0^{circ} mathrm{C} . ) what is the change in the diameter of the hole when the sheet is heated to ( 227^{circ} mathrm{C} ) ? ( alpha ) for copper ( =1.70 times 10^{-5} K^{-1} ) A ( cdot 1.44 times 10^{-2} mathrm{cm} ) B . ( 14.4 times 10^{-2} mathrm{cm} ) ( mathrm{c} cdot 144 times 10^{-2} mathrm{cm} ) D. ( 0.144 times 10^{-2} mathrm{cm} ) | 11 |

939 | The unit of thermal capacity is : A ( cdot c a l /^{circ} C ) в. ( c a l / g ) c. ( operatorname{cal} / g^{circ} C ) D. cal | 11 |

940 | Find the heat lost by a copper cube of mass 400 g when it cool from ( 100^{circ} mathrm{C} ) to ( 30^{circ} mathrm{C} . ) (Specific of heat of copper ( = ) ( left.mathbf{3} 9 mathbf{0} J mathbf{k} g^{-1}^{o} mathbf{C}^{-1}right) ) A. 50000 B. 10000 c. 10920 J D. 10900 J | 11 |

941 | An accurate celsius scale and faulty Fahrenheit thermometer read ( 65^{circ} mathrm{C} ) and ( 154^{circ} F ) respectively when placed in a hot liquid. Find the error in the latter. | 11 |

942 | Equal masses of oil and water are given equal amounts of heat. Then which of the following statement is true? A. Temperature rise in oil is less than temperature rise in water. B. Temperature rise in oil is more than temperature rise in water. c. Temperature rise in oil is equal to the temperature rise in water D. None of these | 11 |

943 | The water equivalent of a copper calorimeter is 4.5 g. If specific heat of copper is ( 0.09 c a l / g /^{0} C, ) then ( left(L_{f}=right. ) ( 80 c a l / g m ) This question has multiple correct options A. Mass of the calorimeter is ( 0.5 mathrm{kg} ) B. Thermal capacity of the calorimeter is ( 4.5 mathrm{cal}^{0} / mathrm{C} ) C. The heat required to raise the temperature of the calorimeter by ( 8^{0} C ) will be 36 cal. D. Heat required to melt ( 15 mathrm{gm} ) of ice at ( 0^{circ} mathrm{C} ) Placed in the calorimeter will be 1200 cal | 11 |

944 | A system goes from ( A ) to ( B ) via two processes I and II as shown in the figure If ( Delta U_{1} ) and ( Delta U_{2} ) are the changes in internal energies in the processes land II respectively, the A ( cdot Delta U_{1}=Delta U_{2} ) B. relation between ( Delta U_{1} ) and ( Delta U_{2} ) cannot be determined c. ( Delta U_{2}>Delta U_{1} ) D. ( Delta U_{2}<Delta U_{1} ) | 11 |

945 | A solid copper sphere of radius ( R ) and ( a ) hollow copper sphere of outer radius ( boldsymbol{R} ) are heated to the same temperature and allowed to cool in the same surroundings. Then A. Solid sphere cools faster B. Hollow sphere cools faster c. Both cool equally D. cannot be decided | 11 |

946 | The coefficient of linear expansion of a crystalline substance in one direction is ( 2 times 10^{-4} /^{0} mathrm{C} ) and in every direction perpendicular to it is ( 3 times 10^{-4} /^{0} mathrm{C} ). The coefficient of cubical expansion of crystal is equal to A. ( 5 times 10^{-4} /^{0} mathrm{C} ) B. ( 4 times 10^{-4} /^{0} mathrm{C} ) c. ( 8 times 10^{-4} /^{0} mathrm{C} ) D. ( 7 times 10^{-4} /^{0} mathrm{C} ) | 11 |

947 | Assertion Two thin blankets put together are warmer than a single blanket of double the thickness. Reason Thickness increases because of air layer enclosed between the two blankets. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 11 |

948 | A liquid P of specific heat capacity ( 1800 J k g^{-1} K^{-1} ) and at ( 80^{circ} mathrm{C} ) is mixed with liquid ( R ) of specific heat capacity ( 1200 J k g^{-1} K^{-1} ) and at ( 30^{circ} mathrm{C} . ) After mixing, the final temperature of mixture is ( 50^{circ} mathrm{C} . ) In what proportion by weight are the liquids mixed? | 11 |

949 | Recently, the phenomenon of superconductivity has been observed at ( 95 K . ) This temperature is nearly equal to. ( mathbf{A} cdot-288^{circ} F ) B . ( -146^{circ} F ) c. ( -368^{circ} F ) ( mathrm{D} cdot+178^{circ} mathrm{C} ) | 11 |

950 | During an experiment an ideal gas is found to obey an additional law ( mathrm{V}^{2} mathrm{P}= ) constant. The gas is initially at a temperature ( T ) and volume ( V ). When it expands to a volume 2 V, the temperature becomes A. ( T ) в. 2T c. ( T sqrt{2} ) D. ( T / 2 ) | 11 |

951 | The substance having the highest specific latent heat of fusion is : A . lead B. wax ( c . ) ice D. gold | 11 |

952 | The phenomenon involved in sea breeze and land breeze is A. Convection B. Conduction c. Radiation D. None | 11 |

953 | Which one of the following substance has highest specific heat capacity at room temperature and atmospheric pressure? A. water B. Ice c. Aluminium D. Mercury | 11 |

954 | There are two hollow spheres made of different materials, one with double the radius and one fourth wall thickness of the other are filled with ice. If the time taken for melting the ice completely in larger sphere is 25 minutes and that for smaller sphere is 16 minutes, the ratio of the thermal conductivity of the larger sphere to the smaller sphere is : A . 4: 5 B. 5: 4 ( c cdot 25: 8 ) D. 8: 25 | 11 |

955 | A closed container of volume ( 0.02 mathrm{m}^{3} ) contains a mixture of neon and argon gases at a temperature of ( 27^{0} mathrm{C} ) and at a pressure of ( 1 times 10^{5} N / m^{2} . ) The total mass of the mixture is 28 g. If the gram molecular weights of neon and argon are 20 and 40 respectively, the masses of the individual gases in the container are respectively(assuming them to be ideal) ( [mathrm{R}=8.314 mathrm{J} / mathrm{mol} mathrm{K}] ) ( mathbf{A} cdot 16 mathrm{gm}, 12 mathrm{gm} ) B. ( 4 mathrm{gm}, 24 mathrm{gm} ) ( mathbf{c} cdot 6 mathrm{gm}, 22 mathrm{gm} ) D. ( 12 mathrm{gm}, 16 mathrm{gm} ) | 11 |

956 | A thermodynamic system is said to be in thermal contact with another system if it can exchange: A. energy through the process of heat transfer B. energy through the process of work c. matter D. all of the above | 11 |

957 | Which of the following process does not occur through convection: A. Boiling of water B. Land breeze and Sea breeze c. circulation of air around furnace D. Heating of glass bulb through filament | 11 |

958 | The mode of transfer of heat which requires no medium, is called as: A. Radiation B. Conduction c. combusion D. convection | 11 |

959 | The most commonly used themometric substance is A. water B. alcohol c. mercury D. none of these | 11 |

960 | Indian style of cooling drinking water is to keep it in a pitcher having porous walls. Water comes to the outer surface very slowly and evaporates. Most of the energy needed for is taken from the water itself and the water is cooled down. Assume that a pitcher contains ( 10 k g ) of water and ( 0.2 g ) of water comes out per second. Assuming no backward heat transfer from the atmosphere to the water, calculate the time in which the temperature decreases by ( 5^{circ} C ) Specific heat capacity of water ( =4200 J k g^{-1} C^{-1} ) and latent heat of vaporization of water ( =2 cdot 27 times ) ( 10^{6} J k g^{-1} ) | 11 |

961 | The quantity of heat required to change the temperature of ( 1 mathrm{kg} ) of a substance by ( 1^{circ} mathrm{C} ) is called its : A. specific heat B. Latent heat c. Total energy D. Heat of fusion | 11 |

962 | The Sl unit of specific latent heat is A. cal ( g^{-1} ) B . cal ( g^{-1} mathrm{K}^{-1} ) ( c cdot J operatorname{kg}^{-1} ) D. J kg ( ^{-1} mathrm{K}^{-1} ) | 11 |

963 | If two systems are in thermal equilibrium, then they should have same temperature A. True B. False | 11 |

964 | The volume of a gas at ( 27^{circ} mathrm{C} ) and 2 atmospheric pressure is 2 litres. If the pressure is doubled and absolute temperature is made half, the new volume of gas is ( A cdot 50 m ) B. 500 m1 c. ( 1000 mathrm{ml} ) D. 2000 ml | 11 |

965 | is a suitable technique of separation of the components from a mixture of calcium sulphate and camphor. A. Sublimation B. Distillation c. Sedimentation D. None of the above | 11 |

966 | The thermometric liquid used to measure up to ( -100^{circ} mathrm{C} ) is : A. alcohol B. mercury c. water D. benzene | 11 |

967 | An ideal gas is found to obey an additional law ( V P^{2}= ) constant. The gas is initially at temperature T and volume V. When it expands to a volume 2 V, the temperature becomes: A ( cdot frac{T}{sqrt{2}} ) в. 27 c. ( frac{2 T}{sqrt{2}} ) D. 47 | 11 |

968 | Assertion Two thin blankets put together are warmer than a single blanket of double the thickness. Reason Thickness increases because of air layer enclosed between the two blankets. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

969 | A thermometer is used to measure A . heat B. thermal capacity c. water equivalent D. temperature | 11 |

970 | The volume of thin brass and the volume of a solid cube made of same material is both equal to ( 1 m^{3} ) at ( 0^{0} C ). What will be the ratio of change in volumes of vessel and the cube on being heated to ( 25^{0} ) C? Given ( alpha ) for brass ( = ) ( mathbf{1} . mathbf{9} times mathbf{1 0}^{-mathbf{5}} /^{0} mathbf{C} ) | 11 |

971 | Thermal capacity= | 11 |

972 | There is a mixture of three solid compounds ( A, B ) and ( C . ) Out of these compounds ( A ) and ( C ) are soluble in water and compound ( C ) is sublimable also. In what sequence the following techniques can be used for their effective separation? I. Filtration II. Sublimation III. Crystallisation from water extract IV. Dissolution in water ( A cdot(|),(1),(1 vee),(1 mid) ) B. (IV), (I), (II), (III) c. ( (1),(11),(11),(1 vee) ) ( D cdot(11),(1 V),(1),(11) ) | 11 |

973 | (i) Why does a bottle of soft drink cool faster when surrounded by ice cubes than by ice cold water, both at ( 0^{circ} mathrm{C} ) ? (ii) A certain amount of heat ( Q ) will warm ( 1 g ) of material ( X ) by ( 3^{circ} C ) and ( 1 g ) of material ( Y ) by ( 4^{o} C . ) Which material has a higher specific heat capacity? | 11 |

974 | A light bulb is constructed from ( 2 mathrm{cm} ) of tungsten wire of diameter ( 50 mu m ) and is enclosed in an evacuated glass bulb. What temperature does the filament reach when it is operated at a power of 1 watt. (Assume the emissivity of the tungsten surface is 0.35 Stefan’s constant ( =mathbf{5 . 6 7} times mathbf{1 0}^{-4} mathbf{c m}^{-mathbf{2}} mathbf{K}^{-mathbf{4}} ) A . ( 2000 K ) в. ( 4000 K ) ( c .2500 K ) D. ( 1200 K ) | 11 |

975 | Match List – I (Mixture to be separated) with the List – II (Method used) and select the correct option using the codes given below. List -I (mixture to be ( quad ) List – II (Method separated) used) | 11 |

976 | The intensity of radiation emitted by the sun has its maximum value at a wavelength of ( 510 n m ) and that emitted by the North Star has the maximum value at 350 nm. If these stars behave like black bodies, the ratio of the surface temperature of the sun and the North Star is A . 1.46 B. 0.69 c. 1.21 D. 0.83 | 11 |

977 | Which of the following is/are Absolute Temperature Scale(s)? This question has multiple correct options A. Kelvin Scale B. Rankine Scale c. celsius scale D. Fahrenheit Scale | 11 |

978 | During night time cool breeze blows from A. land, sea B. sea,land c. mountain,land D. land,mountain | 11 |

979 | A ( 10 k W ) drilling machine is used to drill a bore in a small aluminium block of mass ( 8 k g . ) Find the rise in temperature of the block in 2.5 minutes,assuming ( 50 % ) power is used up in heating the machine itself or lost to the surroundings. (Specific heat of aluminium= ( left.0.91 J g^{-1 o} C^{-1}right) ) ( mathbf{A} cdot 100^{circ} C ) в. ( 103^{circ} mathrm{C} ) ( mathbf{c} cdot 150^{circ} mathrm{C} ) D. ( 155^{circ} mathrm{C} ) | 11 |

980 | Q Type your question. and ( T_{2}left(T_{2}>T_{1}right) . ) Which of the following plots is correct? ( A ) B. ( c ) ( D ) | 11 |

981 | The temperature of a gas contained in a closed vessel is increased by ( 2 mathrm{K} ) when the pressure is increased by ( 2 % ). The initial temperature of the gas is : A. ( 200 k ) в. 100k c. ( 200^{circ} mathrm{C} ) D. ( 100^{circ} mathrm{C} ) | 11 |

982 | What is the role of a plane mirror and a glass sheet in a solar cooker? | 11 |

983 | Condensed solid produced during sublimation is: A. crystals B. sublimate c. residue D. insoluble | 11 |

984 | Two bodies ( X ) and ( Y ) are in thermal equilibrium. Body Y is also at the same temperature as a third body Z. The three bodies are of different materials and have different masses. Which statement must be correct? A. ( x ) and ( Y ) must have the same heat capacity B. ( Y ) and ( Z ) have the same internal energy C. There is no net transfer of energy if ( x ) is placed in thermal contact with z D. It is not necessary that ( Y ) should be in thermal equilibrium with z | 11 |

985 | When spheres are raised to the same temperature A .1: 32: 243 B . 1: 8: 27 c. 1: 16: 128 D. 1: 4: 9 | 11 |

986 | Metal nails weighing ( 100 g ) are heated to ( 100^{circ} C ) and dropped into a copper calorimeter of mass ( 100 g ) containing ( 40 g ) of water at ( 1^{circ} C . ) If the resulting temperature is ( 10^{circ} mathrm{C} ), the specific heat of metal is (Sp. heat of copper is ( 0.1 mathrm{calg}^{-1 o} C^{-1} ) ): A . 0.01 calg ( ^{-1} ) o ( C^{-1} ) B. 0.05 calg( ^{-1} ) o ( C^{-1} ) c. 0.03 calg ( ^{-1} ) o ( C^{-1} ) D. 0.5 calg( ^{-1} ) o ( C^{-1} ) | 11 |

987 | A gas behaves more closely as an ideal gas at: A. low pressure and low temperature B. low pressure and high temperature c. high pressure and low temperature D. high pressure and high temperature | 11 |

988 | State whether given statement is True or False Two thin blankets are more warmer than one thick blanket A. True B. False | 11 |

989 | Which warms up faster when same amount of heat is applied to iron and silver? | 11 |

990 | The radiation of an electric room heater is most effective when it is : A. uncleaned B. polished to shine c. painted green D. painted black | 11 |

991 | Fill in the blank spaces: The amount of heat energy supplied to boiling water at ( 100^{0} C ) is called latent heat of A. Evaporation B. Vaporisation c. Both ( A & B ) D. None of these | 11 |

992 | The amount of heat (in calories) required to convert 10 g of ice at ( -10^{0} C ) into steam at ( 100^{0} C ) is nearly: (Specific heat of steam is ( mathbf{5 3 6} ) cal ( / mathbf{g m}-mathbf{K} ) A ( . quad 5400 ) cal B. 6400 cal c. 7210 cal D. 8250 cal | 11 |

993 | A container is partially filled with hot water, sealed and left to cool. Which statements are correct? 1. As the temperature decreases, water molecules lose kinetic energy. 2. As the temperature decreases, more water molecules move from vapour to liquid. 3. As the temperature decreases, the vapour pressure of the water decreases. A. 1,2 and 3 are correct B. 1 and 2 only are correct C. 2 and 3 only are correct D. 1 only is correct | 11 |

994 | The coefficient of linear expansion of stee and brass are ( 11 times 10^{-6} /^{circ} mathrm{C} ) and ( 19 times ) ( 10^{-6} /^{circ} mathrm{C} ) respectively. If their difference in lengths at all temperatures has to kept constant at ( 30 mathrm{cm} ), their lengths at ( 0 mathrm{C} ) should be: A. ( 71.25 mathrm{cm} ) and ( 41.25 mathrm{cm} ) B. 82 cm and 52 cm c. ( 92 mathrm{cm} ) and ( 62 mathrm{cm} ) D. 62.25 cm and 32.25 cm | 11 |

995 | ( 1300 J ) of heat energy is supplied to raise the temperature of ( 0.5 k g ) of lead from ( 20^{circ} C ) to ( 40^{circ} C . ) Calculate the specific heat capacity of lead. A ( cdot 65 mathrm{J} k g^{-1} K^{-1} ) B ( cdot 260 J k g^{-1} K^{-1} ) c. ( 130 mathrm{Jkg}^{-1} mathrm{K}^{-1} ) D. ( 1300 mathrm{Jkg}^{-1} mathrm{K}^{-1} ) | 11 |

996 | A black body at ( 200 mathrm{K} ) is bound to exit maximum energy at a wavelength ( 14 mu ) m. When its temperature is raised to ( 1000 mathrm{K}, ) then wavelength at which maximum energy emitted is: ( A cdot 14 mathrm{mm} ) в. ( 7 mu m ) c. ( 2.8 mu m ) D. 28 mm | 11 |

997 | A body with area ( A ) at a material temperature ( boldsymbol{T} ) and emissivity ( boldsymbol{e}=mathbf{0 . 6} ) is kept inside a spherical black body. what will be the maximum energy radiated per second? ( mathbf{A} cdot 0.60 sigma mathrm{AT}^{4} ) B . ( 1.00 sigma ) AT ( ^{4} ) c. ( 0.80 sigma ) АТ ( ^{4} ) D. ( 0.40 sigma ) АТ ( ^{4} ) | 11 |

998 | In hot water bottles, water is used because A. its specific heat is low B. its specific heat is highh c. it is cheap D. it is easily available | 11 |

999 | 1 kg of water is converted into steam at the same temperature and at 1 atm (100 kPa). The density of water and steam are ( 1000 mathrm{kgm}^{-3} ) and ( 0.6 mathrm{kgm}^{-3} ) respectively. The latent heat of vaporisation of water is ( 2.25 times ) ( 10^{6} J k g^{-1} . ) What will be increase in energy? A ( .3 times 10^{5} J ) В . ( 4 times 10^{6} J ) c. ( 2.08 times 10^{6} J ) D. None of these | 11 |

1000 | ( 233 mathrm{K} ) is equal to A ( cdot 40 ) B . ( -40^{circ} ) ( c cdot 172^{circ} ) D. – 172 | 11 |

1001 | In summer, a mild wind is often found on the shore of a calm river. This is due to : A. difference in thermal conductivity of water and soil B. convection currents c. conduction between air and the soil D. radiation from the soil | 11 |

1002 | A liquid with coefficient of volume expansion ( gamma ) is filled in a container of a material having coefficient of linear expansion ( alpha ). If the liquid overflows on heating, then: A ( cdot gamma=3 alpha ) в. ( gamma>3 alpha ) c. ( gamma<3 alpha ) D . ( gamma=a^{3} ) | 11 |

1003 | In a solid, heat is transferred mainly by the process of A. conduction B. convection c. radiation D. conduction and convection both | 11 |

1004 | The triple points of neon and carbon dioxide are ( 24.57 mathrm{K} ) and ( 216.55 mathrm{K} ) respectively. Express these temperatures on the Celsius and Fahrenheit scales | 11 |

1005 | When 60 calories of heat are supplied to ( 15 mathrm{g} ) of water, the rise in temperature is A ( cdot 75^{circ} mathrm{C} ) В. ( 90^{circ} mathrm{C} ) ( mathbf{c} cdot 4^{circ} C ) D. ( 0.25^{circ} mathrm{C} ) | 11 |

1006 | The process by which a solid changes directly into gas is called: A. decantation B. sublimation c. condensation D. sedimentation | 11 |

1007 | The unit of latent heat is A ( cdot ) cal-g B . cal/% c. cal/g D. none of these | 11 |

1008 | By the process of convection, the transfer of heat is always A. Vertically downwards B. Vertically upwards c. Both D. None | 11 |

1009 | Assertion Two thin blankets put together are warmer than a single blanket of double the thickness. Reason Thickness increases because of air layer enclosed between the two blankets. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 11 |

1010 | Two cubes, one silver and one iron, have the same mass and temperature. A quantity Q of heat is removed from each cube which of the following properties do not cause the final temperature of the cubes to be different? A. Density B. Specific heat c. volume D. Mass | 11 |

1011 | The quantity of heat which can rise the temperature of ( x ) gm of a substance through ( t_{1}^{o} C ) can rise the temperature of y gm of water through ( t_{2}^{o} C ) is same. The ratio of specific heats of the substances is: A ( cdot y t_{1} / x t_{2} ) B. ( x t_{2} / y t_{1} ) c. ( y t_{2} / x t_{1} ) D. ( x t_{1} / y t_{2} ) | 11 |

1012 | The temperature at which the reading of Fahrenheit thermometer will be double that of a Centigrade thermometer is: A ( cdot 160^{circ} mathrm{C} ) B. ( 180^{circ} mathrm{C} ) ( mathbf{c} cdot 32^{circ} C ) D. ( 100^{circ} mathrm{C} ) | 11 |

1013 | A liquid takes 5 minutes to cool from ( 80^{circ} mathrm{C} ) to ( 50^{circ} mathrm{C} . ) How much time(in mins) will it take to cool from ( 60^{circ} mathrm{C} ) to ( 30^{circ} mathrm{C} ) ? The temperature of surrounding is ( 20^{circ} mathrm{C} ) Use exact method. | 11 |

1014 | In solar water heater, a coper pipe with its outer surface painted in black is fixed in the form of a coil in a box. A. The only purpose of bending copper pipe is to increase the capacity of water storage. B. Bending copper pipe as a coil helps to increase the surface area for heating. C. Both (1) and (2) are true D. Both (1) and (2) are false | 11 |

1015 | A mercury thermometer is transferred from melting ice to a hot liquid. The mercury rises to ( 9 / 10 ) of the distance between the two fixed points. Find the temperature of the liquid in Fahrenheit scale. ( mathbf{A} cdot 197^{circ} F ) B . ( 162^{circ} mathrm{F} ) ( mathbf{c} cdot 112^{circ} F ) D. ( 113^{circ} F ) | 11 |

1016 | Centigrade (Celsius) scale can be converted into Kelvin scale by formula ( mathbf{A} cdot Omega^{0} C= ) Temperature in ( mathrm{Kelvin}+273.15 ) B ( cdot Omega^{0} C= ) Temperature in Kelvin -273.15 ( mathbf{C} cdot Omega^{0} C= ) Temperature in Fahrenheit +273.15 D. ( Omega^{0} C= ) Temperature in Fahrenheit -273.15 | 11 |

1017 | What is Latent Heat? A. It is the heat given to a body and simultaneously the body releases it to the atmosphere B. It is the heat given to a body to heat it by ( 1^{circ} mathrm{C} ) C. It is the heat given to body to change its state at constant temperature D. None of the above | 11 |

1018 | An aluminium rod (length ( l_{1} ) and coefficient of linear expansion ( alpha_{A} ) ) and a steel rod (length ( l_{2} ) and coefficient of linear expansion ( alpha_{B} ) ) are joined together. If the length of each rod increased by the same amount when their temperature are raised by ( t^{circ} C ) then ( l_{1} / l_{2}+1 ) is: ( mathbf{A} cdot alpha_{A} / alpha_{B} ) в. ( alpha_{B} / alpha_{A} ) c. ( alpha_{B} / alpha_{A}+1 ) D. ( alpha_{A} / alpha_{B}+1 ) | 11 |

1019 | A temperature difference of ( 27^{circ} ) on the Kelvin scale is A . 27 B. 300 K c. ( -246 k ) D. zero | 11 |

1020 | A new temperature scale uses ( X ) as a unit of temperature, where the numerical value of the temperature ( t_{x} ) in this scale is related to the absolute temperature ( T ) by ( t_{x}=3 T+300 . ) If the specific heat of a material using this unit is ( 1400 mathrm{Jkg}^{-1} mathrm{X}^{-1} ) its specificne in the S.I. system of units is A. ( 4200 mathrm{Jkg}^{-1} mathrm{K}^{-1} ) B. ( 1400 mathrm{J} mathrm{kg}^{-1} mathrm{K}^{-1} ) ( mathbf{C} cdot 466.7 mathrm{J} mathrm{kg}^{-1} mathrm{K}^{-1} ) D. impossible to determine from the information provided | 11 |

1021 | At what temperature is the Fahrenheit scale reading equal to twice of Celsius? A ( cdot 40^{circ} mathrm{C} ) B . ( 160^{circ} mathrm{C} ) ( mathbf{c} cdot 80^{circ} C ) D. ( 100^{circ} mathrm{C} ) | 11 |

1022 | Which phenomenon occurs during the following change? Size of naphtalene balls decreases. A. condensation B. sublimation c. evaporation D. melting | 11 |

1023 | Examples of sublimate does not include: A. ammonium salts B. nitrates c. iodine D. naphthalene | 11 |

1024 | ( frac{frac{pi}{2}}{frac{2}{2}} ) | 11 |

1025 | The range of clinical thermometer is A ( .37^{circ} mathrm{C} ) to ( 42^{circ} mathrm{C} ) B ( cdot 95^{circ} F ) to ( 110^{circ} F ) ( mathbf{c} cdot 90^{circ} F ) to ( 112^{circ} F ) D. ( 95^{circ} C ) to ( 104^{circ} C ) | 11 |

1026 | What is the specific latent heat of the metal? A ( cdot 1000 ) J ( g^{-1} ) B. ( 500 mathrm{Jg}^{-1} ) c. 1500 J ( g^{-1} ) D. None of the above | 11 |

1027 | Two systems are in thermal equilibrium. The quantity which is common for them is A . heat B. momentum c. specific heat D. temperature | 11 |

1028 | Specific heat of aluminium is ( 0.25 c a l / g^{o} C . ) The water equivalent of an aluminium vessel of mass one kilogram is ( mathbf{A} cdot 40 g m ) в. ( 250 g m ) ( mathbf{c} cdot 25 g m ) D. ( 2.5 g m ) | 11 |

1029 | We have ( 20 mathrm{Kg} ) of a block of a substance at its melting point. The substance has a latent heat of fusion of 1500 Joules per kilogram and a specific heat at of 2500 Joules per kilogram degree Celcius. How much heat is needed to change the block entirely into a liquid? A. 30000 B. 750 J c. 1250 D. 3000 J E. 8000 | 11 |

1030 | When you touch a vessel on a stove your body feels hot. Why? A. Heat energy is transferred from vessel to the body B. Heat energy is transferred from body to the vessel C. Kinetic energy is transferred from vessel to the body D. Kinetic energy is transferred from body to the vessel | 11 |

1031 | (i) When water is poured on an icy surface, some ice melts. (ii) When an ice block is added to water in a drum, some ice melts. So in which case is more ice melted. When water is added to ice, or ice to water? | 11 |

1032 | Of the following instruments, which instruments is most suitable for measuring a temperature of ( 400^{circ} mathrm{C} ? ) A. Mercury thermometer B. Alcohol thermometer c. Radiation thermometer D. Thermo-couple thermometer | 11 |

1033 | In convection currents, heat is transferred upwards A. horizontally B. diagonally c. vertically D. none of these | 11 |

1034 | A spherical half of volume ( 1000 mathrm{cm}^{3} ) is subjected to a pressure of 10 atmosphere. The change in volume is ( 10^{-3} mathrm{cm}^{-3} . ) If the ball is made of iron find its bulk modulus.(Atmospheric pressure ( left.=1 times 10^{3} N m^{-2}right) ) ( mathbf{A} cdot 3 times 10^{11} N / m^{2} ) B . ( 2 times 10^{11} N / m^{2} ) c. ( 1 times 10^{11} mathrm{N} / mathrm{m}^{2} ) D. ( 4 times 10^{11} mathrm{N} / mathrm{m}^{2} ) | 11 |

1035 | One mole of an ideal gas expands against a constant external pressure of atm from a volume of ( 10 d m^{3} ) to a volume of ( 30 d m^{3} . ) What would be the work done in joules? A ( .-2026 J ) в. +20265 ( mathrm{c} .-1947 mathrm{J} ) D. ( 1648 J ) | 11 |

1036 | Two identical calorimeters ( P ) and ( Q ) contain an equal quantity of the water at ( 12^{circ} mathrm{C} . mathrm{A} 5 mathrm{g} ) piece of metal ( x ) of specific heat 0.2 cal ( g^{-1 o} C^{-1} ) is dropped into ( P ) and a ( 5 g ) piece of metal ( y ) into Q. The equilibrium temperature in ( P ) is ( 22^{circ} C ) and in ( Q 23^{circ} C . ) If the initial temperature of both the metals is ( 40^{circ} mathrm{C} ) Find the specific heat of metal ( y ) | 11 |

1037 | Soda bottles are made of thick glass so that they can withstand an increase in: A. pressure during summer B. temperature during summer c. viscosity D. potential energy | 11 |

1038 | Two spheres of the same size are made of the same metal, but one is hollow but the other is solid.When, they are heated to the same temperature then A. the hollow sphere will expand more B. the solid sphere will expand more c. both spheres will expands almost equally D. only the solid sphere will expand | 11 |

1039 | Two metallic spheres ( S_{1} ) and ( S_{2} ) are made of the same material and have identical surface finish. The mass of ( S_{1} ) is three times to that of ( S_{2} ). Both the spheres are heated to the same high temperature and placed in the same room having lower temperature but are thermally insulated from each other. The ratio of the initial rate of cooling of ( S_{1} ) to that ( S_{2} ) is : A ( cdot frac{1}{3} ) в. ( left(frac{1}{3}right)^{frac{1}{3}} ) c. ( frac{1}{sqrt{3}} ) D. ( frac{sqrt{3}}{1} ) | 11 |

1040 | At Absolute Zero Temperature,: A. Molecular Energy is Zero B. Molecular Energy is maximum C. Molecular Energy is minimum D. None of these | 11 |

1041 | The mixture of ( X ) and ( Y ) were taken in a condenser flask and were then heated. After keepint it for cooling, crystals of ( Y ) were found on the walls of the flask and X was present as such at the bottom of flask. Identify ( X ) and ( Y: ) A. ( X=N a C l, Y=K C l ) B. ( X= ) Anthracene, ( Y= ) Naphthalene c. ( X=N a C l, Y= ) Naphthalene D. ( X= )Anthracene, ( Y=N a C l ) | 11 |

1042 | Assertion It is hotter over the top of a fire than at the same distance of the sides. Reason Air surrounding the fire conducts more heat upwards. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

1043 | What is latent heat of fusion? | 11 |

1044 | The nature of the graph of pressure ‘P’ against reciprocal of volume ‘V’ of an ideal gas at constant temperature is A. a straight line not passing through origin B. a parabola c. a straight line passing through origin D. a rectangular hyperbola | 11 |

1045 | The temperature of equal masses of three different liquids ( A, B ) and ( C ) are ( 12^{circ} mathrm{C}, 19^{circ} mathrm{C} ) and ( 28^{circ} mathrm{C} ) respectively. The temperature when ( A ) and ( B ) are mixed is ( 16^{circ} mathrm{C} ) and when ( mathrm{B} ) and ( mathrm{C} ) are mixed it is ( 23^{circ} mathrm{C} . ) What should be the temperature when ( A ) and ( C ) are mixed? A ( cdot 20.25^{circ} mathrm{C} ) В. ( 15.87^{circ} mathrm{C} ) ( mathbf{c} cdot 25^{circ} C ) D. ( 30^{circ} mathrm{C} ) | 11 |

1046 | The temperature, to which a gas must be cooled before it can be liquified by pressure alone, is known as its A. Saturation point B. Freezing point c. Liquification temperature D. critical temperature | 11 |

1047 | The amount of heat required to change from solid to liquid state without rise in its temperature is called | 11 |

1048 | Two identical rods ( A ) and ( B ) are of equal Iengths and at the same temperature. The rod ( A ) is placed at smooth surface but ( boldsymbol{B} ) is placed at rough surface. If the temperature of both are raised by the same amount, then : A. final length of ( A ) is greater than that of ( B ) B. final length of both are same c. final length of ( A ) is lesser than that of ( B ) D. none of the above | 11 |

1049 | ( C_{P} 29 J m o l^{-1} K^{-1} ) in the process ( P T= ) constant. | 11 |

1050 | r.m.s. speed of ideal gas at ( 127^{circ} mathrm{C} ) is ( 200 m / s, ) the r.m.s. speed of same ideal gas at temperature ( 227^{circ} mathrm{C} ) is: A. ( 100 sqrt{5} ) 5 в. ( 200 sqrt{5} ) begin{tabular}{l} ( c cdot 100 sqrt{15} ) \ hline end{tabular} D. ( 100 sqrt{10} ) | 11 |

1051 | A glass vessel of volume ( v_{0} ) is completely filled with a liquid and its temperature is raised by ( triangle boldsymbol{T} . ) What volume of the liquid will overflow? Coefficient of linear expansion of glass ( =alpha_{g} ) and coefficient of volume expansion of the liquid ( =gamma ) | 11 |

1052 | Which of the following quantities is zero on an average for the molecules of an ideal gas in equilibrium? A. Kinetic energy B. Momentum c. Density D. speedd | 11 |

1053 | Utensils of a solar cooker are painted with A. White colour B. Red colour c. Green colour D. Black colour | 11 |

1054 | A liquid of specific heat 0.3 at ( 90^{circ} mathrm{C} ) is mixed with another liquid of specific heat 0.5 at ( 15^{circ} mathrm{C} ). If the final temperature of the mixture is ( 60^{circ} mathrm{C} ) then find the ratio of masses of the two liquids mixed. | 11 |

1055 | A 2 meter long aluminum pipe at ( 27^{circ} mathrm{C} ) is heated until it is 2.0024 at ( 77^{circ} ) C. The coefficient of linear expansion of aluminum is : A . ( 12 times 10^{-6} /^{circ} mathrm{C} ) B . ( 24 times 10^{-6} /^{circ} mathrm{C} ) c. ( 6 times 10^{-6} /^{circ} mathrm{C} ) D ( .20 times 10^{-2} ) | 11 |

1056 | Define the term ‘conductivity’ of a metallic wire. write its Sl unit. | 11 |

1057 | (A): the linear coefficients of expansion of a crystal along three perpendicular ( operatorname{axes} operatorname{are} alpha, frac{-alpha}{2}, frac{alpha}{5} . ) its volume coefficient is ( frac{7 alpha}{10} ) (B): For an-isotropic solids ( boldsymbol{r}=boldsymbol{alpha}_{boldsymbol{x}}+boldsymbol{alpha}_{boldsymbol{y}}+boldsymbol{alpha}_{boldsymbol{z}} ) ( A cdot A ) and ( B ) are correct and ( B ) is correct explanation for ( A ) B. A and B are correct and B is not correct explanation for ( A ) C. A is true and B is false D. A and B both are wrong | 11 |

1058 | Given a body has a heat capacity of 1.6 ( c a l /^{o} C . ) What is the amount of heat required to raise its temperature by ( mathbf{1 0}^{circ} boldsymbol{C} ? ) ( mathbf{A} cdot 16 mathrm{cal} ) B. 1.6 call ( c .8 ) са( a l ) D. 4 call ( l ) | 11 |

1059 | What amount of heat must be supplied to ( 2.0 times 10^{-2} k g ) of nitrogen (at room temperature) to raise its temperature by ( 45^{circ} mathrm{C} ) at constant pressure? (Molecular mass of ( boldsymbol{N}_{2}=mathbf{2 8}: boldsymbol{R}= ) ( 8.3 m o l^{-1} K^{-1} . ) | 11 |

1060 | At the molecular level what can be said about Heat energy? A. Heat energy is equal to total mechanical energy of all its molecules B. Heat energy is equal to total potential energy of all its molecules C. Heat energy is equal to total kinetic energy of all its molecules D. Heat energy is equal to total heat energy of all its molecules | 11 |

1061 | Convert ( 20^{circ} mathrm{C} ) into Kelvin and Fahrenheit scale. | 11 |

1062 | Parallel rays of light of intensity ( l= ) ( 912 W m^{-2} ) are incident on a spherical black body kept in surroundings of temperature 300 K. Take Stefan- Boltzmann constant ( sigma=5.7 times ) ( 10^{-5} W m^{-2} K^{-4} ) and assume that the energy exchange with the surroundings is only through radiation. The final steady state temperature of the black body is close to: ( A cdot ) 330 ( K ) B. 660 K c. ( 990 mathrm{k} ) D. ( 1550 mathrm{K} ) | 11 |

1063 | The molecules of medium vibrate about their mean positions during heat transfer in the process of A. Conduction B. Radiation c. convection D. None | 11 |

1064 | One end of a lagged cylindrical metal rod of length ( 31.4 mathrm{cm} ) and radius ( 2 mathrm{cm} ) is kept in contact with ice at ( 0^{circ} mathrm{c} ) and the other end in water at ( 100^{circ} mathrm{C} ). Find the rate of melting of ice per minute. ( boldsymbol{L}=mathbf{8 0} boldsymbol{c a l} / boldsymbol{g}, boldsymbol{k}=mathbf{1 0}^{mathbf{5}} ) S.I. units ( (mathbf{7 . 5} boldsymbol{g}) ) | 11 |

1065 | Which of the following does not affect the rate of evaporation? A. Pressure on evaporating substance B. Exposed surface area of the evaporating substance c. Shape of the evaporating substance D. Temperature | 11 |

1066 | Two metallic spheres ( S_{1} ) and ( S_{2} ) are made of the same material and have got identical surface finish. The mass of ( S_{1} ) is thrice that of ( S_{2} ). Both the spheres are heated to the same high temperature and placed in the same room having lower temperature but are thermally insulated from each other. The ratio of the initial rate of cooling of ( S_{1} ) to that of ( S_{2} ) is ( A cdot 1 ) ( overline{3} ) в. ( frac{1}{sqrt{3}} ) c. ( frac{sqrt{3}}{1} ) ( D ) ( left(frac{1}{3}right) ) | 11 |

1067 | Assertion Two thin blankets put together are warmer than a single blanket of double the thickness. Reason Air gets trapped between two blanket which is a bad conductor of heat. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 11 |

1068 | The amount of heat energy required to convert 1 kg of ice ( a t-10^{circ} C ) to water at ( 100^{circ} mathrm{C} ) is ( 7,77,000 mathrm{J} ). Calculate the specific latent heat of ice. Specific heat capacity of ice ( 2100 J k g^{-1} K^{-1} ), specific heat capacity of water = ( 4200 J k g^{-1} K^{-1} ) A. ( 3,360 J k g^{-1} ) B. ( 33,600 J k g^{-1} ) c. ( 33,60,000 J k g^{-1} ) D. ( 3,36,000 J k g^{-1} ) | 11 |

1069 | A calorimeter contains ( 70.2 g ) of water at ( 15.3^{circ} mathrm{C} ). If ( 143.7 g ) of water ( operatorname{at} 36.5^{circ} mathrm{C} ) in mixed it with the common temperature is ( 28.7^{circ} mathrm{C} ). The water equivalent of the calorimeter is: A. ( 15.6 g ) в. ( 9.4 g ) ( c .6 .3 g ) D. ( 13.4 g ) | 11 |

1070 | Water is poured into a pan and heated over a flame. After some time, the hot water begins rising to the top. Which type of heat transfer is involved in this? A. conduction B. convection c. radiation D. thermal expansion E. specific heat | 11 |

1071 | A sample of an ideal gas occupies a volume of ‘V’ at a pressure ‘P’ and absolute temperature ‘T’. The mass of each molecule is ‘m’. The equation for density is A . mkT B. P/kT ( c cdot P /(k T V) ) D. Pm/kT | 11 |

1072 | Assertion Latent heat of fusion of ice is 336000 J ( k g^{-1} ) Reason Latent heat refers to change of state without any change in temperature. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

1073 | Assertion For each ten degree rise of temperature the specific rate constant is nearly doubled. Reason Energy-wise distribution of molecules in a gas is an experimental function of temperature A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

1074 | Heat energy for its propagation essentially requires: A. no medium B. gaseous medium c. solid medium D. liquid medium | 11 |

1075 | Why do we wear cotton clothes in Summer? A. Cotton is a bad conductor of heat and doesn’t allow passage of warmer air near body. B. Cotton is a good conductor of heat and allows body heat to escape in the atmosphere. C. Cotton absorbs sweat from the body, exposing it to atmosphere for easy evaporation D. None of the above | 11 |

1076 | Why is land breeze experienced at night? | 11 |

1077 | A black smith fixes ring on the rime of the wooden wheel of a bullock cart the diameter of the rime and iron ring arc 5.243 and 5.231 resp. at ( 27^{circ} C ) to what temp, should the ring be heated. So as to fit the rime of the wheel ( alpha=1.20 x ) ( mathbf{1 0}^{-mathbf{5}} ) | 11 |

1078 | The unit of thermal capacity is : A ( cdot c a l /^{circ} C ) в. ( c a l / g ) c. ( operatorname{cal} / g^{circ} C ) D. cal | 11 |

1079 | On observing light from three different stars ( P, Q ) and ( R, ) it was found that intensity of violet colour is maximum in the spectrum of ( P, ) the intensity of green colour is maximum in the spectrum of ( mathrm{R} ) and the intensity of red colour is maximum in the spectrum of Q. If ( T_{P}, T_{Q} ) and ( T_{R} ) are the respective absolute temperature of ( P, Q ) and ( R, ) then it can be concluded from the above observations that ( mathbf{A} cdot T_{P}<T_{R}<T_{Q} ) В ( cdot T_{P}<T_{Q}T_{Q}>T_{R} ) ( mathbf{D} cdot T_{P}>T_{R}>T_{Q} ) | 11 |

1080 | In a room where the temperature is ( 30^{circ} mathrm{C}, ) a body cools from ( 61^{circ} mathrm{C} ) to ( 59^{circ} mathrm{C} ) in 4 min. The time (in min) taken by the body to cool from ( 51^{circ} mathrm{C} ) to ( 49^{circ} mathrm{C} ) will be: A . 4 B. 6 c. 5 D. | 11 |

1081 | Energy is being emitted from the surface of black body at ( 127^{circ} mathrm{C} ) at the rate of ( 1.0 times 10^{6} J / s m^{2} . ) The temperature of black body at which the rate of energy is ( 16.0 times 10^{6} J / s m^{2} ) will be: ( mathbf{A} cdot 754^{circ} C ) B. ( 527^{circ} mathrm{C} ) ( mathbf{c} cdot 254^{circ} C ) D. ( 508^{circ} mathrm{C} ) | 11 |

1082 | Thermoflasks and doors of refrigerators have two layered structure with an insulator in between so as: B. not to let heat flow through it c. to make it stronger | 11 |

1083 | Mention phase transition based on which the solid room fresheners work. A. Evaporation B. Condenzation c. occlusion D. Sublimation | 11 |

1084 | Air is a bad conductor of heat because: A. it’s molecules are in continuous contact with each other. B. it’s molecules are not in continuous contact with each other C. it’s molecules absorb all the heat D. it’s molecules are moving randomly due to Brownian motion | 11 |

1085 | State True or False : Evaporation takes place at all temperatures A. True B. False | 11 |

1086 | Match List I with List II List-I a) ( 0.00366 /^{0} mathrm{C} ) e) Avagadros Number b) ( 6.023 times 10^{23} ) molecules ( f ) ) Universal gas constant c) ( -273^{0} mathrm{C} ) g) Pressure coefficient of gas d) ( 8.31 mathrm{J} / mathrm{K} ) -mole h) Intercept of ( mathrm{V}-mathrm{T} ) graph at constnat pressure A. a-g, b-e, c-h, d-f. B. a-f, b-g c-e,d-h. c. a-g,b-e,c-f, d-h. D. a-g,b-f, c-e, d-h | 11 |

1087 | You have the mixture of salt, sand and lodine. Which of these is the best technique to separate these mixtures? A. Evaporation B. Distillation c. Sublimation D. Solvent Extraction | 11 |

1088 | Benzene and chloroform are separated by: A. sublimation B. filtration c. distillation D. crystallization | 11 |

1089 | Anthracene is purified by? A. Filtration B. Distillation C . Crystallisation D. Sublimation | 11 |

1090 | Two layers of cloth of equal thickness provide warmer covering than a single layer of cloth of double the thickness, because they: A. behave like a thermos B. have lesser thickness C. allow heat from atmosphere to the body D. enclose between them a layer of air | 11 |

1091 | The latent heat of vaporization of a substance is always A. greater than its latent heat of fusion B. greater than its latent heat of sublimation c. equal to its latent latent heat of sublimation D. less than its latent heat of fusion | 11 |

1092 | A pendulum clock consists of an iron rod connected to a small, heavy bob. If it is designed to keep correct time at ( 20^{circ} mathrm{C}, ) how fast or slow will it go in 24 hours at ( 40^{circ} mathrm{C} ) ? Coefficient of linear expansion of iron ( =1.2 times 10^{-6} /^{circ} mathrm{C} ) A . 10.4 sec. B . 1.04 sec. c. 0.52 sec. D. 5.02 sec. | 11 |

1093 | Which of the following processes requires the most energy input? Given below is the properties of the water Value Property Specific Heat Latent Heat of Fusion ( 80 mathrm{cal} / mathrm{g} ) Latent Heat of Vaporization 540 cal/g 1 A. Melting ( 100 mathrm{g} ) of ice at ( 0^{circ} mathrm{C} ) B. Freezing 100 g of water at ( 0^{circ} mathrm{C} ) c. Boiling ( 100 mathrm{g} ) of water at ( 100^{circ} mathrm{C} ) D. condensing 100 g of steam at 100 ( ^{circ} mathrm{C} ) E. Heating ( 100 mathrm{g} ) of water from ( 0 mathrm{c} ) to ( 100^{circ} mathrm{C} ) | 11 |

1094 | 100 g of water at ( 70^{circ} mathrm{C} ) is added to 120 g of water at ( 30^{circ} C ) contained in a vessel. The final temperature of mixture is ( 40^{circ} mathrm{C} . ) Calculate the thermal capacity of the vessel. | 11 |

1095 | How much heat is required to raise the temperature of 150 g of iron from ( 20^{circ} C ) to ( 25^{circ} mathrm{C} ) ? (Specific heat of iron ( left.480 J k g^{-1} o C^{-1}right) ) A . 350 B. 345 J c. 360 J D. 330 J | 11 |

1096 | Why specific heat is different from different substance? | 11 |

1097 | ( underbrace{k} ) | 11 |

1098 | In convection, heat is transferred A. upwards B. downwards c. sideways D. in all directions | 11 |

1099 | Which of the following circular rods (given radius ( r ) and length I), each made of the same material and whose ends are maintained at the same temperature will conduct most heat? A. ( r=r_{0} ; l=l_{0} ) B . ( r=2 r_{0} ; l=l_{0} ) c. ( r=r_{0} ; l=2 l_{0} ) D ( cdot r=2 r_{0} ; l=2 l_{0} ) | 11 |

1100 | consists of isosceles triangular frame of base length ( l_{1} ) and expansivity ( alpha_{1} ) and side length ( frac{l_{1}}{l_{2}} ) and expansivity ( alpha_{2} . ) The pendulum is supported as shown in the figure. What is the correct ratio of lengths, so that the length of the pendulum remains unchanged at all temperatures? A ( cdot l_{1} alpha_{1}=l_{2} alpha_{2} ) B. ( frac{l_{1}}{l_{2}}=2 sqrt{frac{a_{2}}{a_{1}}} ) ( mathbf{c} cdot l_{1}^{2} alpha_{1}=l_{2}^{2} alpha_{2} ) D. ( l_{1} l_{2}=alpha_{1} alpha_{2} ) | 11 |

1101 | A thermally insulated vessel is divided into two parts by a heat-insulating piston which can move in the vessel without friction. The left part of the vessel contain one mole of an ideal monoatomic gas, ( & ) the right part is vacuum. The piston is connected to the right wall of the vessel through a spring whose length in free state is equal to the length of the vessel as shown in the figure. Determine the heat capacity ( C ) of the system, neglecting the heat capacities of the vessel, piston and spring. | 11 |

1102 | and converted to steam at ( 100^{circ} mathrm{C} ). Which of the following curves represent the phenomenon qualitatively? ( A ) B. ( c ) D. None of these | 11 |

1103 | A steel tape is calibrated at ( 20^{circ} mathrm{C} ). It is used to measure a length of an object on a hot summer day when the temperature is ( 40^{circ} mathrm{C} ). If measured length is ( 5 mathrm{m} ), the actual length is ( left(a=1 times 10^{-5} /^{circ} mathrm{C}right) ) A. ( 5.001 mathrm{m} ) B. 5.01 ( m ) ( c .5 .1 mathrm{m} ) D. 4.99 ( m ) | 11 |

1104 | 80 g of water at ( 30^{circ} mathrm{C} ) are poured on a large block of ice at ( 0^{circ} mathrm{C} ) The mass of ice that melts is A. ( 30 g ) в. 80 ( g ) ( c cdot 1600 g ) D. ( 150 mathrm{g} ) | 11 |

1105 | tood voo corresponding P-V diagram fo ess is (all figure are schemati nd not drawn to scale) | 11 |

1106 | A liquid P of specific heat capacity ( 1800 J k g^{-1} K^{-1} ) and ( a t 80^{circ} C ) is mixed with a liquid ( R ) of specific heat capacity ( 1200 J k g^{-1} K^{-1} ) and at ( 30^{circ} mathrm{C} . ) After mixing, the final temperature of mixture is ( 50^{circ} mathrm{C} ). In what proportion by weight are the liquids mixed? | 11 |

1107 | A copper rod and a steel rod maintain a difference in their lengths constant=10 ( mathrm{cm} ) at all temperatures. If their coefficients of expansion are ( 1.6 times ) ( 10^{-5} K^{-1} ) and ( 1.2 times 10^{-5} K^{-1}, ) then the length of the Cu rod is A. ( 40 mathrm{cm} ) B. 30 cm c. ( 32 mathrm{cm} ) D. 24 cm | 11 |

1108 | A body cools from ( 80^{circ} mathrm{C} ) to ( 50^{circ} mathrm{C} ) in 5 minutes. Calculate the time it takes to cool from ( 60^{circ} mathrm{C} ) to ( 30^{circ} mathrm{C} ). The temperature of the surroundings is ( mathbf{2 0}^{circ} boldsymbol{C} ) | 11 |

1109 | The Fahrenheit temperature ( boldsymbol{F} ) decreased by 32 is equal to nine-fifths of the centigrade temperature ( C . ) The correct formula framed for the above statement will be : A ( cdot F+32=frac{5}{9} C ) В ( cdot F-32=frac{5}{9} C ) c. ( _{F}+32=frac{9}{5} C ) D. ( _{F-32}=frac{9}{5} C ) | 11 |

1110 | Through which mode of transfer, we receive heat from burning wood? A. Convection B. Conduction c. Radiation D. None | 11 |

1111 | Select the liquid which has the specific heat capacity of ( 4180 J K g^{-1} K^{-1} ) from the following.(mercury, kerosene, water, coconut oil) | 11 |

1112 | The specific heat capacity of solid is ( A cdot R ) в. 3 R c. 5 R D. 9 R | 11 |

1113 | The correct statement of the following: A) Water can be boiled inside the artificial satellite by convection B) Heavy liquid can be boiled in artificial satellite by convection Mark correct option/s A. Both statements are correct B. Both statements are wrong c. A is correct but B is wrong D. B is correct but A is wrong | 11 |

1114 | The quantity of heat taken or given out by unit mass of a substance when it changes from solid to liquid state or liquid to solid state at constant temperature is known as | 11 |

1115 | The S.I. unit of specific heat capacity is A. ( J k g^{-1} K^{-1} ) в. ( J m o l^{-1} K^{-1} ) c. ( J k g^{-1} ) D. ( J K^{-1} ) | 11 |

1116 | The rate of cooling at ( 600 K ), if surrounding temperature is ( 300 K ) is ( mathrm{H} ) The rate of cooling at ( 900 K ) is: A ( cdot frac{16}{3} H ) в. ( 2 H ) ( c .3 H ) D. ( frac{2}{3} H ) | 11 |

1117 | The temperature of a thin uniform rod increases by t. Its moment of inertia about an axis perpendicular to its length increases by: A . B. ( alpha I t ) ( c cdot 2 alpha I ) D. ( alpha^{2} I ) | 11 |

1118 | Radiation depends on: A. the temperature of the substance B. the colour of the substance c. both the above D. none of these | 11 |

1119 | Assertion:At constant pressure when a gas is heated from 40 to ( 41^{0} mathrm{C} ), the increase in volume is ( frac{1}{273} ) of its initial volume at ( 273 mathrm{K} ) Reason:Volume coefficient of gas is ( frac{1}{273}^{0} C ) A. Both assertion (A) and reason (R) are correct and gives the correct explanation B. Both assertion (A) and reason (R) are correct but R doesnt give the correct explanation C. A is true but R is false D. A is false but R is true | 11 |

1120 | The rate at which energy is radiated from a hot body depends upon: This question has multiple correct options A. the nature of its surface B. the area of its surface C. the temperature of its surface D. the temperature of the surroundings | 11 |

1121 | The heat energy is required to raise the temperature of ( 18 mathrm{m} ) of water by ( 1^{circ} mathrm{C} ) is: A . ( 1 J ) B . 2.1 c. ( 4.2 J ) D. 8.4J | 11 |

1122 | Assertion According to Newton’s law, good conductors of electricity are also good conductors of heat. Reason At a given temperature, ( e_{lambda} propto a_{lambda} ) for any body A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 11 |

1123 | A body at ( 50^{circ} mathrm{C} ) cools in a surroundings maintained at ( 30^{circ} mathrm{C} ). The temperature at which the rate of cooling is half that of the begining is : | 11 |

1124 | The diagram shows the graphs of pressure vs density for a given mass of an ideal gas at two temperatures ( T_{1} ) and ( T ) 2 ( A cdot T_{1}>T_{2} ) B. ( T_{1}=T_{2} ) ( c cdot T_{1}<T_{2} ) D. Any of the three are possible | 11 |

1125 | In which mode of transfer of heat molecules pass on heat energy to neighbouring molecules without actually moving from their positions? A. convection B. radiation c. conduction D. none of these | 11 |

1126 | The process during which a liquid on heating changes to vapour state is called boiling. A. True B. False | 11 |

1127 | Which of the following substance in the gaseous state will form purple vapour? A. Oxygen B. Sulphur dioxide c. lodine D. Ammonia | 11 |

1128 | Conversion of vapour into solid on cooling is called: A. desublimation B. vapour deposition c. Both A and B D. None of the above | 11 |

1129 | The resistances of a platinum resistance thermometer at the ice point, the steam point and the boiling point of sulphur are 2.50,3.50 and 6.50 ( Omega ) respectively. Find the boiling point ( ^{o} C ) ) of sulphur on the platinum scale. The ice point and the steam point measure ( 0^{circ} mathrm{C} ) and ( 100^{circ} mathrm{C} ) respectively | 11 |

1130 | Heat energy produces a sensation of A. warmth B. coldness c. both warmth and coldness D. none of these | 11 |

1131 | Describe the formation of sea breeze in coastal region | 11 |

1132 | Fahrenheit scale divides the two fixed points into: A. 180 parts B. 212 parts c. 100 parts D. 32 parts | 11 |

1133 | While measuring the thermal conductivity of liquids, the upper part is kept hot and lower one cool so that: A. convectional flow is stopped B. radiation is stopped c. conduction is easier D. it is easier to perform the experiment | 11 |

1134 | Snow on the mountain top does not melt as a consequence of A. high specific latent heat capacity of ice B. low specific latent heat capacity of ice C. high specific heat capacity of water D. low specific heat capacity of water | 11 |

1135 | At the bottom of a lake where the temperature is ( $ ${7} wedge{0} backslash, mathrm{C} $ $ ) the pressure is 2.8 atmosphere. An air bubble of radius ( 1 mathrm{cm} ) at the bottom rises to the surface. Where the temperature is ( $ ${27} wedge{0} backslash, ) C$ ( $ . ) The radius of the air bubble at the surface is A ( cdot 3^{1 / 3} ) B. ( 4^{1 / 3} ) ( mathbf{c} cdot 5^{1 / 3} ) D. ( 6^{1 / 3} ) | 11 |

1136 | A bimetallic strip of steel and brass of length ( 10 mathrm{cm}, ) initially at ( 15^{circ} mathrm{C}, ) is heated to ( 45^{circ} mathrm{C} ). What is the difference in length between the two substances after they have been heated? The coefficient of linear expansion for steel is ( 1.2 times ) ( 10^{5} / C^{o}, ) and the coefficient of linear expansion for brass is ( 1.9 times 10^{5} / C^{o} ) | 11 |

1137 | Two Straight metallic strips each of thickness t and length I are rivetted together. Their coefficients of linear expansions are ( alpha_{1} ) and ( alpha_{2} . ) If they are heated through temperature ( Delta T ), the bimetallic strip will bend to form an arc of radius ( mathbf{A} cdot t /left[left(a_{1}+a_{2}right) Delta Tright] ) B ( cdot t /left[left(a_{2}-a_{1}right) Delta Tright] ) c. ( tleft(a_{1}+a_{2}right) Delta T ) D. ( tleft(a_{2}+a_{1}right) Delta T ) | 11 |

1138 | Which of the following combination of properties would be most desirable for a cooking pot? A. High specific heat and low conductivity B. Low specific heat and high conductivity c. High specific heat and high conductivity D. Low specific heat and low conductivity | 11 |

1139 | During an experiment, an ideal gas is found to obey a condition ( frac{boldsymbol{P}^{2}}{boldsymbol{rho}}= ) constant ( [rho=text { density of the gas }] ) The gas is initially at temperature ( T ) pressure ( P ) and density ( rho . ) The gas expands such that density changes to ( frac{rho}{2} ) This question has multiple correct options A. The pressure of the gas changes to ( sqrt{2} P ) B. The temperature of the gas changes to ( sqrt{2} T ) C. The graph of the above process on the P-T diagram is parabola. D. The graph of the above process on the P-T diagram is hyperbola. | 11 |

1140 | If the temperature scale is changed from ( ^{circ} boldsymbol{C} ) to ( ^{circ} boldsymbol{F} ), the numerical value of specific heat will ( A ). increase B. decrease c. remain unchanged D. nothing can be said | 11 |

1141 | Two spheres of radii ( boldsymbol{R}_{1} ) and ( boldsymbol{R}_{2} ) have densities ( rho_{1} ) and ( rho_{2} ) and specific heat ( C_{1} ) and ( C_{2} . ) If they are heated to the same temperature, the ratio of their rates of cooling will be A ( cdot frac{R_{2} rho_{2} C_{2}}{R_{1} rho_{C} C_{1}} ) В. ( frac{R_{1} rho_{2} C_{2}}{R_{2} rho_{1} C_{1}} ) c. ( frac{R_{2} rho_{1} C_{2}}{R_{1} rho_{2} C_{1}} ) D. ( frac{R_{2} rho_{2} C_{1}}{R_{1} rho_{1} C_{2}} ) | 11 |

1142 | Define the following and state their numerical value in SI system: (a) Specific latent heat of fusion of ice (b) Specific latent heat of vaporisation of system | 11 |

1143 | Why skin feels dry in an air-conditioned room? A. Because the rate of evaporation decreases with lower humidity. B. Because the rate of evaporation increases with lower humidity. C. Because the rate of evaporation remains same with lower humidity. D. Because the rate of evaporation increases with higher humidity. | 11 |

1144 | The most commonly used thermometric substance is A. water B. alcohol c. mercury D. none of these | 11 |

1145 | The volume that a gas occupies at ( 343 mathrm{K} ) if its volume at ( -25^{0} mathrm{C} ) is 7.5 litre is (The process is isobaric) A. 10.29 Itrs B. 102.9 Itrs c. 1.029 Itrs D. 1029 Itrs | 11 |

1146 | Two thin blankets are warmer than one blanket of their combined thickness, this happens, because A. one blanket is heavier B. Double layer prevent transmission of heat c. Two blankets have large mass D. None of the above | 11 |

1147 | The power radiated by a black body is ( P ) and it radiates maximum energy around the wavelength ( lambda_{0} . ) If the temperature of the black body is now changed so that it radiates maximum energy around wavelength ( frac{3}{4} lambda_{0}, ) power radiated by it will increase by a factor of ( A cdot frac{4}{3} ) В. ( frac{16}{9} ) c. ( frac{64}{27} ) D. ( frac{256}{81} ) | 11 |

1148 | ( A ) body at ( 80^{circ} C ) cools down to ( 64^{circ} mathrm{C} ) in 5 minutes; and in 10 minutes it cools down to ( 52^{circ} C . ) What will be its temperature after 20 minutes? What is the temperature of the environment? | 11 |

1149 | Power emitted by a black body at temperature ( 50^{circ} C ) is ( P . ) Now, temperature is doubled i.e. temperature of black body becomes ( 100^{circ} mathrm{C} ). Now, power emitted is: A. greater than ( P ) but less than ( 16 P ) B. greater than ( 16 P ) ( c . P ) D. 16 ( P ) | 11 |

1150 | The height of a waterfall is ( 50 m . ) If ( g= ) ( 9.8 m s^{-2} ) the difference between the temperature at the top and the bottom of the waterfall is A . 1.17 в. 2.17 c. 0.117 D. 1.43 | 11 |

1151 | The gas law ( left[frac{P V}{T}right]= ) constant is true for A. isothermal change only B. adiabatic change only c. both isothermal & adiabatic D. neither isothermal nor adiabatic | 11 |

1152 | A geyser heats water flowing at the rate of 4 litre per minutes from ( 30 mathrm{C} ) to ( 85 mathrm{C} ) If the geyser operates on gas burner then the amount of heat used per minute is : A ( cdot 9.24 times 10^{5} ) j В. ( 6.24 times 10^{7} ), D. ( 6.24 times 10^{5} ) j | 11 |

1153 | What change in volume will be observed when temperature of water gradually increases from ( 0^{circ} mathrm{C} ) to ( 15^{circ} mathrm{C} ) ? A. Increase steadily B. Decreases steadily c. At first decreases then increases D. At first increases then decreases | 11 |

1154 | Assertion While measuring the thermal conductivity of liquid experimentally, the upper layer is kept hot and the lower layer is kept cold. Reason This avoids heating of liquid by convection. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

1155 | A block of steel heated to ( 100^{circ} mathrm{C} ) is left in a room to cool. Which of the curves shown in figure depicts the correct behaviour? 4 B. ( c ) D. None of thes | 11 |

1156 | Black sweaters are effective than white sweaters. A . less B. equally c. more D. Can’t be determined | 11 |

1157 | Two rods having thermal conductivities in the ratio of 5: 3 and having equal length length and equal cross-section are joined by face to face. If the temperature of free end of first rod is ( 100^{circ} mathrm{C} ) and temperature of free end of second rod is ( 20^{circ} c, ) then temperature of the junction, is- A ( cdot 90^{circ} mathrm{C} ) B . ( 85^{circ} mathrm{C} ) ( mathrm{c} cdot 70^{circ} mathrm{C} ) D. ( 50^{circ} mathrm{C} ) | 11 |

1158 | When the temperature of a copper coin is raised by ( 80^{0} mathrm{C}, ) its diameter increases by ( 0.2 % ) This question has multiple correct options A. percentage rise in the area of a face is ( 0.4 % ) B. percentage rise in the thickness is ( 0.4 % ) c. percentage rise in the volume is ( 0.6 % ) D. coefficient of linear expansion of copper is 0.25 x ( 10^{-4} /^{0} C ) | 11 |

1159 | Which of the following solids are known to undergo sublimation? ¡. ( C O_{2} ) ii. ( boldsymbol{I}_{2} ) iii. Naphthalene A. i only B. ii only c. i and ii only D. ii and iii only E. i, ii and iii | 11 |

1160 | A body cools at the rate of ( 1.2^{0} C ) per minute when its temperature is more that of the surroundings by ( 40^{0} C . ) Find the rate of cooling of the body when its temperature is more than that of surroundings by ( 25^{0} C ) | 11 |

1161 | It is better to wear , wered clothes in summer. A . black B . light C. neither A nor B D. either A or B | 11 |

1162 | A black, metal foll is warmed by radiation from a small sphere at temperature ‘T’ and at a distance ‘d’. It is found that the power received by the foils is P. If both the temperature and distance are doubled, the power received by the foil will be A . 16 P B. 4 P ( c cdot 2 P ) D. | 11 |

1163 | In a steady state the temperature of the ends ( A ) and ( B ) of a ( 20 mathrm{cm} ) long rod ( A B ) is ( 100^{circ} mathrm{C} ) and ( 0^{circ} mathrm{C} . ) The temperature at the point c distant ( 9 mathrm{cm} ) from a is : A ( cdot 45^{circ} mathrm{C} ) В. ( 55^{circ} ) С ( c cdot 60^{circ} mathrm{C} ) D. ( 65^{circ} mathrm{C} ) | 11 |

1164 | A faulty thermometer has ( 90.5^{circ} mathrm{C} ) and ( 0.5^{circ} mathrm{C} ) as upper and lower fixed points respectively. What is the correct temperature if this faulty thermometer reads ( 15.5^{circ} mathrm{C} ) A ( cdot 16.67^{circ} mathrm{C} ) B . ( 16^{circ} mathrm{C} ) ( mathbf{c} cdot 15^{circ} mathrm{C} ) D. ( 15.5^{circ} mathrm{C} ) | 11 |

1165 | A mixture of iodine and sand are separated by method of | 11 |

1166 | If we sit near a fire,we feel warm.Give reason | 11 |

1167 | What would be the final temperature of the mixture when 5 g of ice at ( -10^{circ} mathrm{C} ) are mixed with ( 20 g ) of water at ( 30^{circ} mathrm{C} ) Specific heat of ice is 0.5 and latent heat of water ( 80 mathrm{cal} g^{-1} ) | 11 |

1168 | 10 g of ice at ( -20^{circ} C ) is dropped into a calorimeter containing 10 g of water at ( 10^{circ} mathrm{C} ; ) the specific heat of water is twice that of ice. When equilibrium is reached, the calorimeter will contain: A. ( 20 mathrm{g} ) of water B. 20 g of ice c. ( 10 mathrm{g} ) ice and ( 10 mathrm{g} ) water D. 5 g ice and 15 g water | 11 |

1169 | At what speed does heat radiation travel? What path does it follow? | 11 |

1170 | A heater of power ( boldsymbol{P} boldsymbol{W} ) raises the temperature of ( mathrm{m} ) kg of a liquid by ( Delta T K ) in time ( t s . ) Express the specific heat capacity of liquid in terms of above data A ( cdot c=frac{P Delta T}{m t} ) в. ( c=frac{P}{m Delta T} ) c. ( _{c}=frac{P t}{m Delta T} ) D. ( c=frac{P t}{Delta T} ) | 11 |

1171 | A star behaves like a perfectly black body emitting radiant energy. The ratio of radiant energy emitted per second by this star to that emitted by another star having 8 times the radius of former, but having temperature one-fourth of that of the former in kelvin is : ( A cdot 1: 4 ) B . 1: 16 ( c cdot 4: 1 ) D. 16:1 | 11 |

1172 | A metal cube of length ( 10.0 mathrm{mm} ) at ( 0^{circ} mathrm{C} ) ( (273 mathrm{K}) ) is heated to ( 200^{circ} mathrm{C}(473 mathrm{K}) . ) Given its coefficient of linear expansion is ( 2 times 10^{-5} K^{-1} . ) The percent change of its volume is A . ( 0 . ) B. 0.2 ( c cdot 0.4 ) D. 1.2 | 11 |

1173 | A vertical cylindrical vessel separated in two parts by a frictionless piston free to move along the length of a vessel. The length of vessel is ( 90 mathrm{cm} ) and the piston divides the cylinder in the ratio ( 2: 1 . ) Each of the two parts contain 0.1 mole of an ideal gas. The temperature of the gas is ( 27^{circ} mathrm{C} ) in each part. The mass of the piston is A. ( 41.5 mathrm{kg} ) B. ( 8.97 mathrm{kg} ) c. ( 9.57 mathrm{kg} ) D. 11.57 kg | 11 |

1174 | By which method can ammonium chloride be separated from sand? A. By hand picking B. By filtration c. By sublimation D. By diffusion | 11 |

1175 | Four spheres ( A, B, C ) and ( D ) of different metals but of same radius are kept at same temperature.The ratios of their densities and specific heats are 2: 3: 5: 1 and ( 3: 6: 2: 4 . ) Which sphere will show the fastest rate of cooling (initially)? A. ( A ) в. ( B ) ( c . c ) D. ( D ) | 11 |

1176 | Two identical glass bulbs are interconnected by a thin glass tube. A gas is filled in these bulbs at N.T.P. If one bulb is placed in ice and another bulb is placed in hot bath, then the pressure of the gas becomes 1.5 times. The temperature of hot bath will be ( mathbf{A} cdot 100^{circ} C ) B. ( 182^{circ} mathrm{C} ) ( mathbf{c} cdot 256^{circ} mathrm{C} ) D. ( 546^{circ} mathrm{C} ) | 11 |

1177 | A substance of mass ( M ) requires a power input of ( boldsymbol{P} ) watts to ramain in the molten state at its melting point. When the power source is turned off, the sample completely solidifies in time ( t ) sec. The specific latent heat of fusion of the substance is: A ( . P t ) в. ( frac{P t}{M} ) c. ( P t M ) D. ( frac{P M}{t} ) | 11 |

1178 | The heat needed to turn 1 kg of liquid into gas at its boiling point is known as A . Latent heat B. Specific latent heat of vaporization c. specific latent heat of substance D. Fermentation | 11 |

1179 | Calculate the quantity of heat required to convert ( 1.5 mathrm{kg} ) of ice at ( 100^{circ} mathrm{C} ) to water ( operatorname{at} 15^{circ} C .left(L_{i c e}=3.34 timesright. ) ( mathbf{1 0}^{mathbf{5}} boldsymbol{J} quad boldsymbol{k} boldsymbol{g}^{-mathbf{1}}, boldsymbol{C}_{boldsymbol{w} a t e r}= ) ( begin{array}{llll}mathbf{4 1 8 0} & boldsymbol{J} & boldsymbol{k g}^{-1} & ^{circ} boldsymbol{C}^{-1} mathbf{)}end{array} ) ( begin{array}{llll}text { A } cdot 5.85 & times & 10^{5} & Jend{array} ) ( begin{array}{llll}text { В. } 5.95 & times & 10^{5} & Jend{array} ) ( begin{array}{llll}text { C } cdot 3.95 & times & 10^{5} & Jend{array} ) ( begin{array}{llll}text { D. } 4.95 & times & 10^{5} & Jend{array} ) | 11 |

1180 | The Fahrenheit and Kelvin scales of temperature will give the same reading at A . -40 в. 313 c. 574.25 D. 732.75 | 11 |

1181 | A bubble rises from the bottom of a lake, 90m deep. On reaching the surface, its volume becomes(take atmospheric pressure equals to ( 10 mathrm{m} ) of water A. 4 times B. 8 times c. 10 times D. 3 times | 11 |

1182 | Assertion Kelvin Temperature Scale has the Absolute Zero. Reason At Absolute Zero, the molecular energy is minimum A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

1183 | The melting point of mercury is: A ( .38 .8^{circ} mathrm{C} ) B . ( -38.8^{circ} mathrm{C} ) c. ( 4250^{circ} mathrm{C} ) D. ( 452^{circ} mathrm{C} ) | 11 |

1184 | If the coefficient of linear expansion of glass is 0.000009 , the coefficient of cubical expansion of glass is : A . 0.0000027 B. 0.000027 c. 0.00027 D. 0.000018 | 11 |

1185 | Heat is a form of ( _{-}-ldots-_{text {and }} ) temperature is a of amount of heat energy in a body A. energy, measure B. mass, measure c. energy, instrument D. mass, experiment | 11 |

1186 | A quantity of air ( (gamma=1.4) ) at ( 27^{circ} mathrm{C} ) is compressed suddenly, the temperature of the air system will A . fall B. rise c. remain unchanged D. first rise and then fall | 11 |

1187 | The melting point of ice can be given by: ( mathbf{A} cdot 32^{circ} F ) B. ( 32^{circ} mathrm{C} ) c. ( 273.15 K ) D. Both a and c | 11 |

1188 | Transmission of heat by the movement of heated particles is called A. Conduction B. convection c. Radiation D. Regelation E. Expansion | 11 |

1189 | A body initially at ( 80^{circ} mathrm{C} ) cools to ( 64^{circ} mathrm{C} ) in ( 5 min ) and ( operatorname{to} 52^{circ} C ) in 10 min. The temperature of the surrounding is ( A cdot 26^{circ} C ) B. ( 16^{circ} mathrm{C} ) ( mathbf{c} cdot 36^{circ} C ) D. ( 40^{circ} mathrm{C} ) | 11 |

1190 | A body is kept in cooler surroundings. When the temperature of the body is ( 70^{0} C, ) it cools at the rate of ( 3^{0} C ) per minute and at ( 50^{0} C ), it cools at the rate of ( 1.5^{0} C ) per minute. Find the temperature of the body when it cools at the rate of ( 1^{0} C ) per minute. | 11 |

1191 | State whether true or false: Specific heat of a substance during its change of state is zero. A. True B. False | 11 |

1192 | The P-T graph for the given mass of an ideal gas is shown in figure. Then the volume A . increases B. decreases c. remains constant D. data insufficient | 11 |

1193 | Which of the following represents sublimation? A. Solid ( Leftrightarrow ) Gas B. Solid ( Leftrightarrow ) liquid c. Liquid( Leftrightarrow g a s ) D. Solid ( Leftrightarrow ) liquid ( Leftrightarrow g a s ) | 11 |

1194 | What is the value of universal gas constant | 11 |

1195 | The amount of heat required to change ( 1 mathrm{gm} ) of a substance at its melting point into liquid state without any rise in temperature is called: A. Latent heat of fusion B. Latent heat of vaporisation c. Steam D. Melting point | 11 |

1196 | Which of the following has highest heat capacity? A. ( 10 g ) of water B. 4g of water c. ( 100 g ) of copper D. ( 10 g ) of Mercury | 11 |

1197 | Absolute zero corresponds to A . – 273 ( K ) B . – 273 ( ^{circ} mathrm{C} ) c. ( 273^{circ} F ) D. none of these | 11 |

1198 | In a gas equation, ( P V=R T, V ) refers to the volume of: A. any amount of a gas B. one gram mass of a gas C. one gram mole of gas D. one litre of gas | 11 |

1199 | A ( 10 mathrm{kw} ) drilling machine is used to dril a bore in a small aluminium block of mass ( 8.0 mathrm{kg} . ) How much is the rise in temperature of the block in 2.5 minutes, assuming ( 50 % ) of power is used up in heating the machine itself or lost to the surroundings. Specific heat of aluminium ( =mathbf{0 . 9 1} boldsymbol{J} boldsymbol{g}^{-1} boldsymbol{K}^{-1} ) | 11 |

1200 | Fig. shows a water heater in which water is heated by a gas burner from below. A and B are two pipes.(i) Name the pipe used as inlet for cold water. (ii) Name the pipe used as outlet for hot water (iii) Show the direction of convection currents in the diagram so as to obtain hot water continuously. | 11 |

1201 | A black body at ( 200 mathrm{K} ) is found to emit maximum energy at a wavelength of 14 ( mu mathrm{m} . ) When its temperature is raised to 1000 ( mathrm{K}, ) the wavelength at which maximum energy is emitted is : ( A cdot 14 mu m ) B. 70 ( mu ) m c. ( 1.8 mu mathrm{m} ) D. 2.8 ( mu ) m | 11 |

1202 | In which of the following process, convection does not takes place primarily? A. Sea and land breeze B. Boiling of water c. Warming of glass of bulb due to filament D. Heating air around a furnace | 11 |

1203 | Which of the following processes will quadruple the pressure a) Reduce V to half and double T b) Reduce V to 1/8th and reduce T to half c) Double ( mathrm{V} ) and half ( mathrm{T} ) d) Increase both ( mathrm{V} ) and ( mathrm{T} ) to double the values ( A cdot b, c ) в. а, c. ( c, d ) D. a,d. | 11 |

1204 | The Sl unit of thermal capacity is. A. Joule B. Joule ( k g^{-1} ) c. Joule ( k g-1 K-1 ) D. Joule ( K^{-1} ) | 11 |

1205 | The coefficient of volume expansion of mercury is ( 5.4 times 10^{-4} ) o ( C . ) What is the fractional change in its density for a ( 80^{circ} mathrm{C} ) rise in temperature? | 11 |

1206 | Radiation emitted from a radioactive element, of half life period of 30 min, are measured by a Geigar-Mullar counter The count rate of the sample reduces to 5 disintegrations /sec. in 2hrs. then the initial count rate in disintegration/sec is :- A. 805 в. 200 ( c .250 ) D. 40 | 11 |

1207 | Assertion (A): Thermal radiations are electromagnetic radiation with wave lengths greater than visible light. Reason (R): Thermal radiations can propagate through vacuum. A. both A and R are true and the R is correct explanation of the A B. both A and R are true, but R is not correct explanation of the A c. A is true, but the R is false. D. A is false, but the R is true. | 11 |

1208 | ( 4.0 mathrm{kg} ) of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas at constant volume is ( 5.0 J K^{-1} ) mol ( ^{-1} ) If the speed of sound in this gas at NTP is ( 952 mathrm{ms}^{-1} ) then the heat capacity at constant pressure is (Take gas constant ( mathrm{R}=8.3 mathrm{JK}^{-1} ) mol ( ^{-1} ) A ( cdot 8.5 mathrm{JK}^{-1} mathrm{mol}^{-1} ) в. ( 8.0 mathrm{JK}^{-1} mathrm{mol}^{-1} ) ( mathbf{c} cdot 7.5 mathrm{JK}^{-1} mathrm{mol}^{-1} ) D. ( 7.0 mathrm{JK}^{-1} mathrm{mol}^{-1} ) | 11 |

1209 | One litre of Helium gas at a pressure of 76 ( mathrm{cm}-mathrm{Hg} ) and temperature ( 27^{0} mathrm{C} ) is heated till its pressure and volume are doubled. The final temperature attained by the gas is A ( cdot 900^{0} mathrm{C} ) B . ( 927^{circ} mathrm{C} ) c. ( 627^{circ} mathrm{C} ) D. 327 ( ^{0} mathrm{c} ) | 11 |

1210 | The direct change from solid to gaseous state is referred to as: A. dissociation B. decomposition c. sublimation D. deliquescence | 11 |

1211 | Sublimation requires additional energy and is an: A. endothermic change B. exothermic change ( c . ) both a and ( b ) D. none of above | 11 |

1212 | ( 0.1 m^{3} ) of water at ( 80^{0} C ) is mixed with ( 0.3 m^{3} ) of water at ( 60^{0} ) C.The final temperature of the mixture is A ( cdot 65^{circ} mathrm{C} ) B . ( 70^{circ} mathrm{C} ) ( mathbf{c} cdot 60^{circ} C ) D . ( 75^{circ} mathrm{C} ) | 11 |

1213 | Let there be four articles having colours blue, red, black and white. When they are heated together and allowed to cool, the article that cool earlier is : A. Blue B. Red c. Black D. white | 11 |

1214 | How many calories of heat are required by gram of water at ( 99^{circ} mathrm{C} ) to boil off: A. 530 B. 640 ( c cdot 540 ) D. 500 | 11 |

1215 | Change in length per unit length per unit change in temperature is defines as coefficient of linear expansion. Type 1 for true and 0 for false | 11 |

1216 | Which of the following statement is/ are correct.? A. A gas has two specific heats only B. A material will have only one specific heat, if and only if its coefficient of thermal expansion is equal to zero. C. A gas has infinite number of specific heat D. None of these | 11 |

1217 | The coefficient of apparent volume expansion of a liquid in a copper vessel is ( C ) and in a silver vessel is ( S ). The coefficient of volume expansion of copper is ( gamma_{c} . ) What is the coefficient of linear expansion of silver? A ( cdot frac{left(C+gamma_{c}+Sright)}{3} ) в. ( frac{left(C-gamma_{c}+Sright)}{3} ) c. ( frac{left(C+gamma_{c}-Sright)}{3} ) D. ( frac{left(C-gamma_{c}-Sright)}{3} ) | 11 |

1218 | The top of an insulated cylindrical container is covered by a disc having emissivity ( 0.6, ) conductivity ( 0.167 W K^{-1} m^{-1} ) and thickness ( 1 mathrm{cm} ) The temperature is maintained by circulating oil. (a) Find the radiation loss to the surroundings in ( J m^{-2} s^{-1} ) if temperature of the upper surface of the disc is ( 127^{circ} mathrm{C} ) and temperature of surroundings is ( 27^{circ} mathrm{C} ) (b) Also find the temperature of the circulating oil. Neglect the heat loss due to convection. | 11 |

1219 | No medium is required for transfer of heat by the process of | 11 |

1220 | Why it is more hotter for same distance over the top of a candle than it in the side of its flame? A. Conduction of heat in air is upward B. Heat is maximum radiated in upward direction c. Radiation and conduction both contribute in transferring heat upwards D. convection takes more heat in upward direction | 11 |

1221 | There is a circular hole in a metal plate, when the plate is heated, the radius of hole A. Increases B. Decreases c. Unchanged D. Depends upon metal | 11 |

1222 | The lowest pressure (the best vaccum) that can be created in laboratory at ( 20^{circ} mathrm{C} ) is ( 10^{-10} mathrm{mm} ) of ( mathrm{Hg} ). At this pressure, the number of ideal gas molecules per ( c m^{3} ) will be A. ( 3.22 times 10^{12} ) B . ( 1.61 times 10^{12} ) c. ( 3.29 times 10^{6} ) D. ( 3.22 times 10^{5} ) | 11 |

1223 | Heat which can also get transferred is- A. thermal heat B. mechanical heat c. radiant heat D. none of these | 11 |

1224 | On which law does the study of calorimetry based? A. Joule’s law B. Law of conservation of energy c. Law of Kinetic energy D. None | 11 |

1225 | Name two scales of temperature? A. Kelvin and Celsius B. Celsius and Ratio C. Ordinal and Interval D. None of the above | 11 |

1226 | Three flasks of identical volume are filled separately by (a) 1 gram of ( H_{2} ) (b) 1 gram of ( O_{2} ) (c) 1 gram of ( C O_{2} ) They are immersed in a tank of water so that all of them attain same temperature. The pressures ( P_{1}, P_{2} ) and ( P_{3} ) have the on. ( mathbf{A} cdot P_{1}>P_{2}>P_{3} ) ( mathbf{B} cdot P_{1}=P_{2}=P_{3} ) ( mathbf{c} cdot P_{1}<P_{2} P_{1}>P_{2} ) | 11 |

1227 | A closed vessesl contains 8 gms of oxygen and ( 7 mathrm{gm} ) of Nitrogen. Total pressure at a certain temperature is 10 atm. When all the oxygen is removed from the system without chage in temperature then the pressure will be A. ( 10 times 7 / 15 ) atm B. 10 x 8/15atm c. ( 10 times 8 / 16 ) atm D. ( 10 times 8 / 32 ) atm | 11 |

1228 | State three factors which determine the quantity of heat absorbed by a body. | 11 |

1229 | If temperature scale is changed from ( C ) to ( F, ) numerical value of specific heat will ( A ). increase B. decrease c. remain same D. nothing can be decided | 11 |

1230 | Arrange the following in order of increasing conductivity of heat: copper, air, water, mercury | 11 |

1231 | Assertion A brass tumbler feels much colder than a wooden tray on a chilly day. Reason The thermal conductivity of brass is more than the thermal conductivity of wood. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

1232 | Which of the following represents the phase change from gas directly to solid? A. Deposition B. Sublimation c. Liquefaction D. Fusion E. Vaporization | 11 |

1233 | Find odd one out A. copper B. Mercury c. Gold D. wood | 11 |

1234 | The process ( S o l i d rightarrow G a s ) is known as: A. sublimation B. condensation c. evaporation D. deposition E. melting | 11 |

1235 | One gram of ice at ( 0^{circ} mathrm{C} ) is added to 5 yarn of water at ( 10^{circ} mathrm{C} ). If the latent heat of ice be 80 cal /g, then the final temperature of the mixture is A ( .5^{circ} mathrm{C} ) B. ( 0^{circ} mathrm{C} ) ( mathbf{c} cdot-5^{circ} mathrm{C} ) D. None of the above | 11 |

1236 | What is the unit of latent heat of a body? A. Joule/kg B. Calorie/’c c. Joules/’c D. Kg/Joules | 11 |

1237 | Iron, hydrogen peroxide and carbon dioxide are given. When the same amount of heat is supplied to these three substances, which expands most? A. Hydrogen peroxide B. Carbon dioxide c. Iron D. All of these | 11 |

1238 | Temperature at which liquid changes to gaseous state A. Freezing point B. Boiling point c. Neutral state D. None | 11 |

1239 | A wire of length ( 1.0 mathrm{m} ) and radius ( 10^{-3} ) ( mathrm{m} ) is carrying a heavy current and is assumed to radiate as a black body. At equilibrium its temperature is ( 900 K ) while that of the surrounding is ( 300 K ) The resistivity of the material of wire at ( 300 K ) is ( pi^{2} times 10^{-8} Omega . m . ) Its temperature coefficient of resistance is ( 7.8 times 10^{-3} /^{0} C . ) Then current in wire will be (Assume resistivity is linear function of temp.) ( A cdot 12 A ) B. 24 A c. 36 A D. 48 A | 11 |

1240 | A closed thermally insulated vessel contains ( 100 g ) of water at ( 0^{circ} C . ) If the an from this vessel in rapidly pumped out, intensive evaporation will produce cooling and as a result of this water will freeze. How much ice will be formed by this method? If latent heat of fusion is ( 80 c a l / g ) and of evaporation ( 560 c a l / g ) | 11 |

1241 | (a) Two identical vessels ( A ) and ( B ) containing equal volume of water are placed in sun. The outer surface of one vessel A is blackened, while of other vessel B is polished. Thermometer ( boldsymbol{T}_{1} ) and ( T_{2} ) are used to measure the temperature of vessel ( A ) and ( B ) respectively. Which thermometer will record a higher temperature? Give a reason for your answer (b) If the two vessels ( A ) and ( B ) as described in part (a) are filled with boiling water and placed inside the room, which thermometer will show a higher temperature after 15 minutes? Give a reason for your answer | 11 |

1242 | If we keep pop corn in a pressure cooker on a flame, heat is transferred from flame to corn by : A. Conduction B. Radiation c. convection D. None | 11 |

1243 | 2 grams of monoatomic gas occupies a volume of 2 litres at a pressure of ( 8.3 times ) ( 10^{5} P a ) and ( 127^{0} mathrm{C} ). Find the molecular weight of the gas. (R=8.3 joule/mole/K) A. 2 gram/mole B. 16 gram/mole c. 4 gram/mole D. 32 gram/mole | 11 |

1244 | By increasing the temperature of a liquid is: A. Volume and density decrease B. Volume and density increase C. Volume increases and density decreases D. Volume decreases and density increases | 11 |

1245 | Heat can be transferred to the inside surface of the walls of the container by which of the above? A. I only B. I and II only C. I and III only D. II only E. I, II, and III only | 11 |

1246 | The heat capacity of a solid of mass 175 g is ( 315 mathrm{J}^{circ} mathrm{C}^{-1} ). Calculate specific heat capacity of solid. | 11 |

1247 | Assertion Specific heat of a body is always greater than its thermal capacity. Reason Thermal capacity is the heat required for raising temperature of unit mass of the body through unit degree. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both assertion and reason are incorrect | 11 |

1248 | Two metallic blocks ( P ) and ( Q ) of masses in ratio 2: 1 are given same amount of heat. If their temperature rise by same amount, compare their specific heat capacities. A . 1: 1 B . 2: 1 c. 1: 2 D. 1: 4 | 11 |

1249 | When the temperature of a straight rigid rod increases from ( t ) to ( t+Delta t ), its moment of inertia changes from I to ( I+Delta I . ) If ( alpha ) be the coefficient of linear expansion, then ( 2 alpha Delta t ) will be equal to. ( ^{A} cdot frac{I}{Delta I} ) B. ( I times Delta I ) c. ( frac{Delta I}{I} ) D. ( 2 I Delta I ) | 11 |

1250 | Heat transfer through radiation cannot take place in vacuum. True or false A. True B. False | 11 |

1251 | The snow on mountains does not melt all at once | 11 |

1252 | A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly A. a straight line B. a circular arc c. a parabola D. an ellipse. | 11 |

1253 | A graph is plotted with PV/T on y-axis and mass of the gas along x-axis for different gases. The graph is A. a straight line parallel to x-axis for all the gases B. a straight line passing through origin with a slope having a constant value for all the gases c. a straight line passing through origin with a slope having different values for different gases D. a straight line parallel to y-axis for all the gases | 11 |

1254 | The boiling point of water in Kelvin scale is: A . ( 73.15 K ) В. ( 173.15 K ) c. ( 273.15 K ) D. ( 373.15 K ) | 11 |

1255 | Three bodies of the same material and having masses ( mathrm{m}, mathrm{m} ) and ( 3 mathrm{m} ) are at temperatures ( 45^{circ} mathrm{C}, 50^{circ} mathrm{C} ) and ( 60^{circ} mathrm{C} ) respectively. If the bodies are brought in thermal contact, the final temperature will be. A ( cdot 45^{circ} mathrm{C} ) В. ( 54^{circ} mathrm{C} ) ( mathbf{c} cdot 52^{circ} C ) D. ( 48^{circ} mathrm{C} ) | 11 |

1256 | What is the temperature of the triplepoint of water on an absolute scale whose unit interval size is equal to that of the Fahrenheit scale? | 11 |

1257 | If the temperature of a body is raised by ( 5 % ) then the heat energy radiated would increases by A . ( 5 % ) B . 10% c. ( 11.65 % ) D. 21.55 | 11 |

1258 | A circular disc has a hole of diameter ( d_{1} ) and an external diameter ( d_{2} ), where ( d_{2}=3 d_{1} . ) On heating ( d_{2} ) increases by ( 0.3 % . ) Find ( d_{1} ) | 11 |

1259 | Density and Molar Mass of Gaseous Substances | 11 |

1260 | The temperature ( (T) ) of two samples of the same substance with masses ( boldsymbol{m}_{1} ) and ( m_{2} ) and temperatures ( T_{1} ) and ( T_{2} ) when added together is A. ( frac{m_{2} T_{1}+m_{1} T_{2}}{m_{1}+m_{2}} ) в. ( frac{m_{1} T_{1}+m_{2} T_{2}}{m_{1}+m_{2}} ) c. ( m_{1} T_{1}+m_{2} T_{2} ) D. ( m_{1} T_{2}+m_{2} T_{1} ) | 11 |

1261 | The figure given below shows the cooling curve of pure wax material after heating. It cools from ( A ) to ( B ) and solidifies along ( B D . ) If ( L ) and ( C ) are respective values of latent heat and the specific heat of the liquid wax, the ratio ( boldsymbol{L} / boldsymbol{C} ) is ( boldsymbol{v} ) A . 40 B. 80 c. 100 D. 20 | 11 |

1262 | Solar cell or panels are black in color due to A. They absorb more heat B. They reflect all the heat C. Neither A nor B D. None | 11 |

1263 | A sphere of aluminium of mass 0.047 kg placed for sufficient time in a vessel containing boiling water, so that the sphere is at ( 100^{circ} mathrm{C} ).It is then immediately transferred to ( 0.14 mathrm{kg} ) copper calorimeter containing ( 0.25 mathrm{kg} ) of water at ( 20^{circ} mathrm{C} ). The temperature of water rises and attains a steady state at ( 23^{circ} C ). Calculate the specific ( h ) capacity of aluminium. Given :specific heat capacity of water is 4186 ( J k g^{-1} K^{-1} ) specific heat capacity of copper calorimeter is 385 Jkg( ^{-1} boldsymbol{K}^{-1} ) | 11 |

1264 | Name the factors which can increase the rate of evaporation. | 11 |

1265 | Hot water cools from ( 60^{circ} mathrm{C} ) to ( 50^{circ} mathrm{C} ) in the first 10 minutes and to ( 42^{circ} C ) in the next 10 minutes. The temperature of the surroundings is : A ( cdot 25^{circ} mathrm{C} ) B . ( 10^{circ} mathrm{C} ) ( mathrm{c} cdot 15^{circ} mathrm{C} ) D. ( 20^{circ} mathrm{C} ) | 11 |

1266 | A glass vessel of volume ( 100 mathrm{cm}^{3} ) is filled with mercury and is heated from ( 25^{circ} mathrm{C} ) to ( 75^{circ} mathrm{C} ). What volume of mercury will overflow? Coefficient of linear expansion of glass ( =1.8 times 10^{-6} /^{circ} mathrm{C} ) and coefficient of volume expansion of mercury is ( 1.8 times 10^{-4} /^{circ} C ) A ( cdot 0.67 mathrm{cm}^{3} ) B. ( 0.87 mathrm{cm}^{3} ) ( mathbf{c} cdot 1.74 mathrm{cm}^{3} ) D. ( 0.98 mathrm{cm}^{3} ) | 11 |

1267 | It is hotter at some distance over the flames than in front of it because: A. air conducts heat upwards only B. heat is radiated upwards only c. convection of heat occurs upwards only D. heat is radiated downwards only | 11 |

1268 | If the coefficient of linear expansion is A, the coefficient of superficial expansion is ( mathrm{B} ) and the coefficient of cubic expansion is ( mathrm{C} ), which of the following is false? A. ( C=3 A ) В. ( A=B / 2 ) c. ( B=3 / 2 C ) ( mathbf{D} cdot A=C / 3 ) | 11 |

1269 | topp ( E ) Q туре уочr question ( n ) | 11 |

1270 | The temperature of a furnace is ( 2327^{circ} mathrm{C} ) and the intensity of maximum in its spectrum is nearly at 12000 A. If the intensity in the spectrum of a star is maximum nearly at 4800 A, then the surface temperature of the star is ( mathbf{A} cdot 767^{circ} C ) в. ( 1040^{circ} mathrm{C} ) c. ( 6500^{circ} mathrm{C} ) D. ( 6227^{circ} mathrm{C} ) | 11 |

1271 | A P-V diagram is obtained by changing the temperature of the gas as shown. During this process the gas is : A. heated continuously B. cooled continuously c. heated in the beginning but cooled towards the end D. cooled in the beginning but heated towards the end | 11 |

1272 | The following three objects (1) a metal tray, (2) a block of wood,and (3) a wooden cap are left in a closed room overnight. Next day the temperature of each is recorded as ( T_{1}, T_{2} ) and ( T_{3} ) respectively. The likely situation is A. ( T_{1}=T_{2}=T_{3} ) в. ( T_{3}>T_{2}>T_{1} ) c. ( T_{3}=T_{2}>T_{1} ) D. ( T_{3}>T_{2}=T_{1} ) | 11 |

1273 | A cold steel spoon is dipped in a cup of hot milk. It transfer heat to its other end by the process of | 11 |

1274 | White washed buildings will be in hot weather than the darker buildings. A. hotter B. colder c. wetter D. drier | 11 |

1275 | Hailstone at ( 0^{circ} mathrm{C} ) falls from a height of 1 km on an insulating surface converting whole of its kinetic energy into heat. What part of it will melt? ( left(boldsymbol{g}=mathbf{1 0} boldsymbol{m} / boldsymbol{s}^{2}right) ) A ( cdot frac{1}{33} ) B. ( frac{1}{8} ) c. ( frac{1}{33} times 10^{-4} ) D. All of it will melt | 11 |

1276 | The steam point and the ice point of a mercury thermometer are marked as ( 80^{circ} ) and ( 20^{circ} . ) What will be the temperature in centigrade mercury scale when this thermometer reads ( 32^{circ} ) | 11 |

1277 | 10 g of ice at ( 0^{circ} C ) absorbs 5460 J of heat energy to melt and change to water at ( 50^{circ} mathrm{C} ). Calculate the specific latent heat of fusion of ice. Specific heat capacity of water is ( 4200 J k g^{-1} K^{-1} ) A ( cdot 2168 J g^{-1} ) B. ( 336 J g^{-1} ) ( mathbf{c} cdot 43.36 J g^{-1} ) D. ( 21.68 J g^{-1} ) | 11 |

1278 | When the temperature of a body is equal to that of the surroundings then the body appears A. in the thermal equilibrium B. red c. cold D. hot | 11 |

1279 | Why do coastal areas experience less contrasts in temparature conditions? A. Due to moderating effect of the seas B. Due to land mass c. Due to heat conditions D. Due to rotation of the earth | 11 |

1280 | A cylinder contained ( 10 mathrm{kg} ) of gas at pressure ( 10^{7} mathrm{N} / mathrm{m}^{2} . ) The quantity of gas taken out of cylinder if final pressure is ( 2.5 times 10^{6} mathrm{N} / mathrm{m}^{2} ) is (Assume temperature of gas is onstant A. zero B. 7.5 ( mathrm{Kg} ) c. ( 2.5 mathrm{Kg} ) ( D .5 mathrm{kg} ) | 11 |

1281 | Calculate the heat energy released by water in the experiment in cooling from ( 70^{circ} mathrm{C} ) to ( 45^{circ} ) | 11 |

1282 | Select the wrong statement: A. There is no convection in zero gravity environment B. Entire radiation emitted by a hot body falls in the infrared region of the electromagnetic spectrum C. Blue flame is at higher temperature than a yellow flame D. Diathermanous substance means it neither absorbs nor reflects any fraction of the radiation incident on it | 11 |

1283 | In what pressure range will the compound sublime? A. pressures less than ( P_{b} ) B. pressures between ( P_{b} ) and ( P_{c} ) C. pressures between ( P_{d} ) and ( P_{c} ) D. pressures between ( P_{b} ) and ( P_{d} ) E. The compound will not sublime under any Pressure | 11 |

1284 | If pressure and temperature of an ideal gas are doubled and volume is halved, the number of molecules of the gas A. becomes half B. becomes two times c. becomes 4 times D. remains constant | 11 |

1285 | On which one of the factors does the nature of the thermal radiation depend inside an enclosure? This question has multiple correct options A. size of the enclosure B. temperature c. nature of the walls D. color of the walls | 11 |

1286 | The rods of length ( L_{1} ) and ( L_{2} ) are made of materials whose coefficient of linear expansion are ( alpha_{1} ) and ( alpha_{2} ) respectively.If the difference between the two length of independent of temperature, then A ( cdot frac{L_{1}}{L_{2}}=frac{alpha_{1}}{alpha_{2}} ) B. ( frac{L_{1}}{L_{2}}=frac{alpha_{2}}{alpha_{1}} ) c. ( L_{1}^{2} alpha_{1}=L_{2}^{2} alpha_{2} ) D. ( alpha_{1}^{2} L_{1}=alpha_{2}^{2} L_{2} ) | 11 |

1287 | The temperature of a body is 3000 K. The wavelength corresponding to maximum emission of radiation will be ( A cdot 1 M ) в. ( 1 dot{A} ) ( mathrm{c} cdot 9.76 times 10^{-7} mathrm{m} ) D . ( 48.8 times 10^{-7} mathrm{m} ) | 11 |

1288 | the specific heat capacity of liquid. ( mathbf{A} cdot 0.3 times 10^{3} J k g^{-1} K^{-1} ) B ( cdot 12 times 10^{3} J k g^{-1} K^{-1} ) C ( .3 times 10^{3} mathrm{Jkg}^{-1} mathrm{K}^{-1} ) ( mathbf{D} cdot 6 times 10^{3} J k g^{-1} K^{-1} ) | 11 |

1289 | Calorie is defined as the amount of heat required to raise temperature of ( 1 g ) of water by ( 1^{circ} mathrm{C} ) and it is defined under which of the following conditions? A . From ( 14.5^{circ} mathrm{C} ) to ( 15.5^{circ} mathrm{C} ) at ( 760 mathrm{mm} ) of ( mathrm{Hg} ) B. From ( 98.5^{circ} mathrm{C} ) to ( 99.5^{circ} mathrm{C} ) at ( 760 mathrm{mm} ) of ( mathrm{Hg} ) C. From ( 13.5^{circ} mathrm{C} ) to ( 14.5^{circ} mathrm{C} ) at ( 76 mathrm{mm} ) of ( mathrm{Hg} ) D. From ( 3.5^{circ} mathrm{C} ) to ( 4.5^{circ} mathrm{C} ) at ( 76 mathrm{mm} ) of ( mathrm{Hg} ) | 11 |

1290 | We consider the radiation emitted by the human body. Which of the following statements if true? A. The radiation is emitted during the summers and absorbed during the winters B. The radiation emitted lies in the ultraviolet region and hence is not visible C. The radiation emitted is in the infra-red region D. The radiation is emitted only during the day | 11 |

1291 | A liquid has a volume ( V_{1} ) at temperature ( theta_{1} ). The temperature is increased to ( theta_{2} ). If ( gamma ) is the coefficient of cubic expansion, the increase in volume is given by A ( cdot V_{1} gammaleft(theta_{2}-theta_{1}right) ) в. ( V_{1} gamma theta_{2} ) c. ( V_{1}+V_{1} gamma theta_{2} ) D. ( V_{1}left[1+gammaleft(theta_{2}-theta_{1}right]right. ) | 11 |

1292 | The device which is used to measure specific heat capacity of solid and liquids is | 11 |

1293 | State True and False : If humidity is high in the atmosphere, rate of evaporation is higher. A. True B. False | 11 |

1294 | A hot body placed in the air is cooled according to Newton’s law of cooling. The rate of decrease of the temperature being k times the temperature difference from the surroundings, starting from ( t=0, ln frac{ln (x)}{k} ) time, the body will lose half the maximum temperature it can lose. Find the value of ( boldsymbol{x} ) | 11 |

1295 | When a body has the same temperature as that of its surroundings: A. It does not radiate heat B. It radiates same quantity of heat as it receives from the surroundings c. It radiates less quantity of heat as it receives from the surroundings D. It radiates more quantity of heat as it receives from the surroundings | 11 |

1296 | ( frac{sqrt{2}}{2} ) ( k ) | 11 |

1297 | A piece of metal weighs 45 g in air and ( 25 mathrm{g} ) in a liquid of density ( 1.5 times ) ( 10^{3} k g-m^{-3} ) kept at ( 30 C . ) When the temperature of the liquid is raised to ( 40 C, ) the metal piece weighs 27 g. The density of liquid at ( 40 mathrm{C} ) is ( 1.25 times ) ( 10^{3} k g-m^{-3} . ) The coefficient of linear expansion of metal is A. ( 1.3 times 10^{-3} / C ) в. ( 5.2 times 10^{-3} / C ) c. ( 2.6 times 10^{-3} / C ) D. ( 0.26 times 10^{-3} / C ) | 11 |

1298 | The body temperature of a healthy person is ( 98.6 F . ) Calculate the corresponding temperature on the Kelvin scale. | 11 |

1299 | Mercury boils at ( 356^{circ} mathrm{C} ). However mercury thermometers are made such that they can measure temperatures up to ( 500^{circ} mathrm{C} ). This is done by : A. maintaining vacuum above the mercury column in the steam of the thermometer B. filling nitrogen gas at high pressure above the mercury column C. filling nitrogen gas at low pressure above the mercury column D. filling oxygen gas at high pressure above the mercury column | 11 |

1300 | The coefficient of linear expansion ( alpha ) is that of the coefficient of real expansion. A. double B. one third c. half D. equal to | 11 |

1301 | A solid body is heated upto very high temperature As we go on heating its brightness increases and it appears white at the end The sequence of the colour observed as the temperature of the body increases will be- A. Yellow, green, red, white B. Green, yellow, red, white c. Red, green, yellow, white D. Red, yellow, green, white | 11 |

1302 | A gas thermometer measure the temperature from, the variation of pressure of a sample of gas. If the pressure measured at the melting point of lead is 2.20 times the pressure measured at the triple point of water find the melting point of lead. ( A cdot 601 K ) B. 420 K c. 790 к D. 510 K | 11 |

1303 | The percentage change in the pressure of a given mass of a gas filled in a container at constant temperature is 100%. Calculate the percentage change in its volume. | 11 |

1304 | Convert ( 5^{0} F ) according to (i) Celsius scale, and (ii) Kelvin scale. A ( cdotleft(text { i) }-15^{0} Cright. ) (ii) ( 258 K ) B. (i) ( -17^{0} C ) (ii) ( 288 K ) c. ( left(text { i) }-15^{0} Cright. ) (ii) ( -258 K ) D. (i) 20 ( ^{0} C ) (ii) ( 237 K ) | 11 |

1305 | When an inflated tyre bursts, the air escaping out A. will get heated up B. will be cooled c. will not undergo any change in its temperature D. will be liquefied | 11 |

1306 | A dipole with a dipole moment of magnitude ( p ) is in stable equilibrium in an electrostatic field of magnitude E. Find the work done in rotating this dipole to its position of unstable equilibrium. A. 2pE B. 4pE c. pE D. 9pE | 11 |

1307 | The temperature of a room is ( mathbf{7 7}^{circ} boldsymbol{F} ) What would it be on the Celsius scale? ( mathbf{A} cdot 25^{circ} C ) B. ( 45^{circ} mathrm{C} ) ( mathbf{c} cdot 60^{circ} mathrm{C} ) D. ( 350^{circ} mathrm{C} ) | 11 |

1308 | In convectional currents, A. Warmer molecules move up and colder molecules sink down. B. Heat energy moves up by infrared waves. C. There is no motion of molecules. D. It is dominant in solids | 11 |

1309 | In Solar cooker: A. Electricity is used to cook food B. Chemical energy is converted to electrical energy C. Radiation from the sun is used to cook food D. Heat energy is converted light energy | 11 |

1310 | A liquid takes 5 min. to cool from ( 80^{circ} mathrm{C} ) to ( 50^{circ} mathrm{C} ). How much time does it take to cool from ( 60^{circ} mathrm{C} ) to ( 30^{circ} mathrm{C} ) ? Temperature of surroundings is ( 20^{circ} mathrm{C} ) A. 2 mins B. 3 mins c. 5.5 mins D. None of these | 11 |

1311 | The rate ( _{–}-_{–} ) as the temperature of water reduces due to cooling. | 11 |

1312 | The only liquid which is a good conductor of heat is- A. water B. turpentine c. alcohol D. mercury | 11 |

1313 | A clock pendulum having coefficient of linear expansion ( boldsymbol{alpha}=mathbf{9} times mathbf{1 0}^{-mathbf{7}} /^{circ} mathbf{C} ) has a period of ( 0.5 s ) at ( 20^{circ} mathrm{C} . ) If the clock is used in a climate where the temperature is ( 30^{circ} mathrm{C} ), how much times does the clock lose in each oscillation? ( (g=text { constant }) ) A ( cdot 2.5 times 10^{-7} mathrm{s} ) B . ( 5 times 10^{-7} ) s D. ( 2.25 times 10^{-6} mathrm{s} ) | 11 |

1314 | More is the specific heat capacity of a substance, ( ldots ) the temperature for a given amount of heat energy A. more B. less c. same D. cant say | 11 |

1315 | toppr Q Type your question Kelvin along the Y-axis, which of the curves in Fig. 4.1 most correctly represents this behavour? ( A ) B. ( c ) ( D ) | 11 |

1316 | A slab of stone area ( 3500 mathrm{cm}^{2} ) and thickness ( 10 mathrm{cm} ) is exposed on the lower surface to steam at ( 100^{circ} mathrm{C} ). A block of ice at ( 0^{circ} C ) rests on upper surface of the slab. In one hour ( 4.8 k g ) of ice of melted. The thermal conductivity of the stone is ( J s^{-1} m^{-1} k_{-1} ) is (Latent heat of ice ( =mathbf{3 . 3 6} times mathbf{1 0}^{mathbf{5}} mathbf{J} / mathbf{k g} ) ) A . 12.0 B. 10.5 c. 1.02 D. 1.24 | 11 |

1317 | How is the heat energy supplied to a liquid used during boiling at a fixed temperature? | 11 |

1318 | Which of the curves in figure represents the relation between Celsius and Fahrenheit temperature? ( A ) B. ( c ) ( D ) | 11 |

1319 | Two identical blocks of metal are at ( 20^{circ} ) C and ( 80^{circ} mathrm{C}, ) respectively. The specific heat of the material of the two blocks increases with temperature. Which of the following is true about the final temperature ( mathrm{T}_{f} ) when the two blocks are brought into contact (assuming that no heat is to the surroundings?? ( mathbf{A} cdot mathbf{T}_{f} ) will be ( 50^{circ} mathrm{C} ) B. ( T_{f} ) will be more than ( 50^{circ} ) C ( mathrm{C} cdot mathrm{T}_{f} ) will be less than ( 50^{circ} mathrm{C} ) D. ( T_{f} ) can be either more than or less than ( 50^{circ} mathrm{C} ) depending on the precise variation of the specific heat with temperature. | 11 |

1320 | Water is poured into a pan and heated over a flame. After some time, the hot water begins rising to the top. Which type of heat transfer is involved in this? A. conduction B. convection c. radiation D. thermal expansion E. specific heat | 11 |

1321 | A metal ball immersed in water weighs ( boldsymbol{w}_{1} ) at ( 5^{circ} boldsymbol{C} ) and ( boldsymbol{w}_{2} ) at ( mathbf{5 0 ^ { circ }} boldsymbol{C} ). The coefficient of cubical expansion of metal is less than that of water. Then A. ( w_{1}>w_{2} ) В. ( w_{1}<w_{2} ) ( mathbf{c} cdot w_{1}=w_{2} ) D. Insufficient information | 11 |

1322 | Two identical calorimeters ‘X’ and ‘Y’, of water equivalent 10 g each, contain equal quantities of the same liquid. The mass, initial temperature and specific heat capacity of the liquid present in both calorimeters are 50 g, ( 25^{circ} mathrm{C} ) and ( frac{1}{2} c a l g^{-1 circ} C^{-1} ) respectively.A 10 g metal piece (say A) of specific heat capacity ( 0.4 c a l g^{-1 circ} C^{-1} ) is dropped in calorimeter “X”. and 25 g of metal piece (say B) of specific heat capacity ” ( S_{B} ) “is dropped into calorimeter “Y”. Due to this, the equilibrium temperature in ‘X’ and ‘Y’ rises to ( 30^{circ} mathrm{C} ) and ( 40^{circ} mathrm{C} ) respectively. If the initial temperature of B’ is twice that of ‘A’, then find the value of “S ( _{B} ” ) | 11 |

1323 | During solidification, heat energy is | 11 |

1324 | A beaker full of hot water is kept in a room and it cools from ( 90^{circ} mathrm{C} ) to ( 80^{circ} mathrm{C} ) in ( t_{1} ) sec. II) ( 80^{circ} mathrm{C} ) to ( 70^{circ} mathrm{C} ) in ( t_{2} ) sec. III) ( 70^{circ} mathrm{C} ) to ( 60^{circ} mathrm{C} ) in ( t_{3} ) sec. ( 1 V) 60^{circ} mathrm{C} ) to ( 50^{circ} mathrm{C} ) in ( t_{4} ) sec. f the room temperature is ( 10^{0} ) C. Identify the order in which the time of cooling increases A. IV,III,II & 1 B. ।,॥।,IV & ॥ c. ।, ॥,॥। & IV D. III, I, II & IV | 11 |

1325 | Assertion (A): When hot water is poured in athick glass tumbler then the tumbler breaks. Reason (R): Glass is a bad conductor of heat A. A and R are correct and R is correct explanation for B. A and R are correct and R is not correct explanation for ( A ) C. A is true and R is false D. A is wrong and R is true | 11 |

1326 | In a calorimeter of water equivalent 20 g, water of mass ( 1.1 mathrm{kg} ) is taken at ( 288 mathrm{K} ) temperature ( 373 mathrm{K} ) is passed through it and temperature of water increases by ( 6.5^{circ} mathrm{C} ) then the mass of steam condensed is A. ( 17.5 mathrm{g} ) в. ( 11.7 mathrm{g} ) c. ( 15.7 mathrm{g} ) D. ( 18.2 mathrm{g} ) | 11 |

1327 | Though air is bad conductor yet a body kept in air losses heat quickly this is due to A. Conduction B. Convection c. Radiation D. None of these | 11 |

1328 | A metal rod ( A ) of ( 25 mathrm{cm} ) length expands by ( 0.050 mathrm{cm} ) when its temperature is raised from ( 0^{circ} mathrm{C} ) to ( 100^{circ} mathrm{C} ). Another rod B of a different metal of length ( 40 mathrm{cm} ) expands by ( 0.040 mathrm{cm} ) for the same rise in temperature. A third rod C of 50 cm length is made up of pieces of rods ( A ) and B placed end to end expands by ( 0.03 mathrm{cm} ) on heating from ( 0^{circ} mathrm{C} ) to ( 50^{circ} mathrm{C} ) Find the lengths of each portion of the composite rod. | 11 |

1329 | The difference between volume and pressure coefficients of an ideal gas is: A ( cdot frac{1}{273} ) B. 273 c. ( frac{2}{273} ) D. Zero | 11 |

1330 | At what temperature is the Fahrenheit scale reading equal to half of Celsius scale? | 11 |

1331 | Why do people prefer to use copper bottom vessels for cooking? | 11 |

1332 | During burning of a candle, different zones of combustion in the flame are listed below: A. outermost zone B. innermost zone C. middle zone The correct order of temperature of zones is : A. ( A>B>C ) в. ( C>B>A ) c. ( B>C>A ) D. ( A>C>B ) | 11 |

1333 | A steel rod of length ( 0.5 mathrm{km} ) is used in the construction of a bridge. It has to withstand a temperature change of ( 40^{circ} mathrm{C} . ) The gap that is allowed for its expansion is : ( left(boldsymbol{alpha}=mathbf{1 0}^{-mathbf{6}} /^{circ} boldsymbol{C}right) ) A. ( 0.02 mathrm{cm} ) B. 0.02mm ( c .2 m ) D. 20 mm | 11 |

1334 | An air bubble of volume ( v_{0} ) is released by a fish at a depth h in a lake. The bubble rises to the surface. Assume constant temperature and standard atmospheric pressure ( P ) above the lake. The volume of the bubble just before reaching the surface is (d is the density of water) ( mathbf{A} cdot v_{0}+frac{h g d}{P} ) B. ( frac{v_{0}(P+h g d)}{P} ) c. ( frac{v_{0}}{P}+h g d ) D. ( left(v_{0}+v_{0} d gright) ) | 11 |

1335 | The radiant energy from the sun, incident normally at the surface of earth, is ( 20 k c a l / m^{2}- ) min. What would have been the radiant energy incident normally on the earth, if the sun had a temperature twice of the present one? A ( .40 mathrm{kcal} /left(mathrm{m}^{2}-mathrm{min}right) ) B. 80 kcal/(m^-min) c. ( 160 mathrm{kcal} /left(mathrm{m}^{2}-mathrm{min}right) ) D. 320 kcal/(m^-min) | 11 |

1336 | How much heat is needed to transform a ( 1 mathrm{kg} ) block of ice at ( 5^{circ} mathrm{C} ) to a puddle of water at ( 10^{circ} mathrm{C} ? ) | 11 |

1337 | Convert each of the following temperature in ( ^{circ} boldsymbol{F} ) to the celsius and kelvin scale ( 68^{circ} F, 5^{circ} F, 176^{circ} F ) | 11 |

1338 | A closed container of volume ( V ) contains an ideal gas at pressure ( P ) and Kelvin Temperature T. The temperature of the gas is changed to 4 T due to passing heat to the container. Choose correct pairs of pressure and volume after change of the temperature. A . P and ( V ) B ( cdot operatorname{Pand}_{2}^{1} V ) c. 4 Pand ( 4 V ) D. ( 4 P ) and ( V ) E ( cdot frac{1}{4} P ) and ( V ) | 11 |

1339 | Camphor kept in an open vessel disappears by the process of: A. diffusion B. sublimation c. evaporation D. condensation | 11 |

1340 | Equal masses of oil and water are given equal amounts of heat. Then which of the following statement is true? A. Temperature rise in oil is less than temperature rise in water. B. Temperature rise in oil is more than temperature rise in water. c. Temperature rise in oil is equal to the temperature rise in water D. None of these. | 11 |

1341 | A sample of ( O_{2} ) gas and a sample of hydrogen gas both have the same no. of moles, the same volume and same pressure. Assuming them to be perfect gases, the ratio of temperature of oxygen gas to the temperature of hydrogen gas is : A . 1: B. 1: c. 2: D. 1: | 11 |

1342 | Two uniform rods of equal lengths ( left(l_{0}right) ) and equal masses have coefficient of linear expansion ( alpha ) and ( 2 alpha ) are placed in contact on a smooth horizontal surface as shown. The temperature of system is ( theta^{0} C . ) Now the temperature is increased by ( Delta theta^{0} C ) The junction of the rods will shift from its initial position by? initial temperature ( =theta^{circ} mathrm{C} ) A ( cdot frac{log _{2} Delta theta}{2} ) B. ( frac{log _{3} Delta theta}{3} ) ( c cdot frac{log _{4} Delta theta}{_{4}} ) D. ( frac{log _{6} Delta theta}{6} ) | 11 |

1343 | The volume of an air bubble increases by ( x % ) as it rises from the bottom of a lake to its surface. If the height of the water barometer is ( mathrm{H} ), the depth of the lake is ( A ) в. ( frac{H x}{(100+x)} ) ( c cdot frac{H x}{100} ) D. 100 ( H / x ) | 11 |

1344 | By imparting heat to a body, its temperature rises by ( 15^{circ} mathrm{C} ). What is the corresponding rise in temperature on kelvin scale? ( mathbf{A} cdot 288 K ) в. ( 15 K ) ( c .30 K ) D. ( 7.5 K ) | 11 |

1345 | A scientist proposes a new temperature scale in which the ice point is ( 25 x ) (X is the new unit of temperature) and the steam point is 305 X. The specific heat capacity of water in this new scale is ( left(text { in } J k g^{-1} X^{-1}right) ) A ( .4 .2 times 10^{3} ) B. ( 3.0 times 10^{3} ) c. ( 1.2 times 10^{3} ) D. ( 1.5 times 10^{3} ) | 11 |

1346 | has the highest specific latent heat of vaporisation. A. steam B. constant c. can’t say D. none of the above | 11 |

1347 | lce at ( -20^{circ} mathrm{C} ) is dropped into ( 0.25 mathrm{kg} ) of the water at ( 20^{circ} mathrm{C} ). The final temperature of the system is ( 0^{circ} C ) when all the ice is melted. Find approximate mass of ice in the water in kg. (Specificheat of ice = ( mathbf{2 0 0 0} boldsymbol{J} boldsymbol{k g}^{-1} boldsymbol{K}^{-1}, boldsymbol{L}=mathbf{3 3 . 4} times mathbf{4} boldsymbol{J} boldsymbol{k g}^{-1} ) A . 0.06 B. 6 ( c cdot 60 ) D. | 11 |

1348 | The unit formerly used for measuring heat capacity of a body was: A. Calories/(‘C) B. Joules/(‘C) c. calories D. Joules | 11 |

1349 | It is warmer to have two thin blankets than to have single thick blanket because: A. Thick blankets cannot give more warmth B. Two blankets allow more heat to pass through them c. Air between the two blankets is a good conductor of heat D. Air between the thin blankets does not allow heat to pass through it since it is a bad conductor | 11 |

1350 | If specific heat of 1 g of coal is ( S ) then the specific heat of 10 g of coal is | 11 |

1351 | A vessel contains 1 mole of ( mathrm{O}_{2} ) (molar ( operatorname{mass} 32 g m) ) at a temperature ( T . ) The pressure is ( P . ) An identical vessel containing 1 mole of He (molar mass ( 4 g m ) ) at a temperature ( 2 T ) has a pressure : A. в. ( frac{P}{8} ) c. ( 2 P ) D. 8P | 11 |

1352 | An air bubble rises from bottom to top of a liquid of density ( 1.5 mathrm{g} / mathrm{cm}^{3} . ) If its volume is doubled, the depth of liquids is A. ( 689 mathrm{cm} ) B. 398 ( mathrm{cm} ) ( c .760 mathrm{cm} ) D. 152 ( mathrm{cm} ) | 11 |

1353 | A solid maintained at ( t_{1}^{o} C ) is kept in an evacuated chamber at temperature ( t_{2}^{o} Cleft(t_{2}<<t_{1}right) . ) The rate of heat absorbed by the body is proportional to: A ( cdot t_{2}^{4}-t_{1}^{4} ) B . ( left(t_{2}^{4}+273right)-left(t_{1}^{4}+273right) ) c. ( t_{2}-t_{1} ) D ( cdot t_{2}^{2}-t_{1}^{2} ) | 11 |

1354 | A body having 1680 J of energy is supplied to 1000 g of water. If the entire amount of energy is converted into heat, the rise in temperature of water (sp. heat of water ( left.=4200 J k g^{-1 o} C^{-1}right) ) ( mathbf{A} cdot 0.4^{circ} C ) В . ( 40^{circ} mathrm{C} ) ( mathbf{c} cdot 4^{circ} C ) D. ( 44^{circ} mathrm{C} ) | 11 |

1355 | The wavelength of maximum intensity of emission of solar radiation is ( lambda_{m}= ) ( 4753 A^{circ} ) and from moon it is ( 14 mu mathrm{mm} ) The surface temperature of sun and moon are ( left(operatorname{given} b=2.898 times 10^{-3}right. ) meter-kelvin) A. 6097 К. 207К в. 8097 К, зот к c. 10000 К, ( 400 mathrm{k} ) D. 3000 К, 100 к | 11 |

1356 | The radius of a metal sphere is ( 100 mathrm{cm} ) ( operatorname{at} 0^{circ} mathrm{C} ) and ( 101 mathrm{cm} ) at ( 100^{circ} mathrm{C} . ) The coefficient of volume expansion of metal is : A ( cdot 10^{-4} /^{circ} mathrm{C} ) В. ( 3 times 10^{-4} /^{circ} mathrm{C} ) c. ( 2 times 10^{-4} /^{circ} mathrm{C} ) D. ( 1.5 times 10^{-4} /^{circ} mathrm{C} ) | 11 |

1357 | Choose the correct statements among the following. This question has multiple correct options A. Heat capacity is the product of mass of specific heat B. In SI system, thermal capacity and water equivalent are numerically equal C. Heat always flows from higher temperature body to lower temperature body. D. At thermal equilibrium, rate of heat flow from hot body equal to the rate of heat flow from cold body. | 11 |

1358 | What is the energy absorbed during the phase change called? | 11 |

1359 | The process by which a mixture of sodium chloride and ammonium chloride can be separated, is called A. sublimation B. chromatography c. evaporation D. distillation | 11 |

1360 | Convection cannot take place in | 11 |

1361 | A copper weight and iron weight of the same mass were dropped from the same height on the ground Which of the weights had the higher temperature after the impact ? (specific heat of ( mathrm{Cu}= ) ( 0.1 mathrm{Kcal} / mathrm{kg}^{o} mathrm{C} );specific heat of iron ( = ) ( left.0.11 mathrm{Kcal} / mathrm{kg}^{circ} mathrm{C}right) ) A. Iron weight B. Copper weight c. Both iron and copper D. Cannot be answered | 11 |

1362 | Define specific latent heat of fusion, ( L_{f} ) A. The specific heat of fusion of a substance is the quantity of heat required to convert a unit mass of the substance from liquid to gaseous state at its boiling point. B. The specific heat of fusion of a substance is the quantity of heat required to convert a unit mass of the substance from solid to liquid state at its melting point. C. The specific heat of fusion of a substance is the quantity of heat required to raise the temperature of unit mass of the substance by ( 1^{circ} mathrm{C} ) D. The specific heat of fusion of a substance is the quantity of heat required to lower the temperature of unit mass of the substance by ( 1^{circ} mathrm{C} ) | 11 |

1363 | A steel scale is correct at ( 0^{circ} mathrm{C} ), the length of a brass tube measured by it at ( 40^{circ} mathrm{C} ) is ( 5 mathrm{m} . ) The correct length of the tube at ( 0^{circ} mathrm{C} ) is (Coefficients of linear expansion of steel and brass are ( 11 times ) ( mathbf{1 0}^{-mathbf{6} /^{circ} C} ) and ( mathbf{1 9} times mathbf{1 0}^{-mathbf{6} /^{circ} mathbf{C}} ) respectively A. ( 4.001 mathrm{m} ) в. ( 5.001 m ) ( c .4 .999 m ) D. ( 4.501 m ) | 11 |

1364 | State whether given statement is True or False A wooden chair feels colder than an iron | 11 |

1365 | State whether given statement is True or False The heat coming from the sun travels by | 11 |

1366 | A thin rod of negligible mass and area of cross-section ( 4 times 10^{-6} m^{2} ) suspended vertically from one end, has a length of ( 0.5 mathrm{m} ) at ( 100^{circ} mathrm{C} ). The rod is cooled to ( 0^{circ} mathrm{C} ; ) but prevented from contracting by attaching a mass at the lower end. Find (i) this mass, and (ii) the energy stored in the rod. Given for the rod, Young’s modulus ( =10^{11} N / m^{2} ) coefficient of linear expansion ( 10^{-5} K^{-1} ) and ( g=10 m / s^{2} ) A . (i) ( 60 mathrm{kg} ), (ii) ( 0.1 mathrm{J} ) B. (i) 40kg, (ii) 0.1J c. (i) 560kg, (ii) 0.1] D. (i) ( 490 mathrm{kg}, ) (ii) 10.1 | 11 |

1367 | A piece of ice at 0 is put into a vessel containing water at ( 0 . ) The ice will A. melt B. not melt c. slightly melt D. vanish in no time | 11 |

1368 | In a room where the temperature is ( 30^{circ} mathrm{C} ) a body cools from ( 61^{circ} mathrm{C} ) to ( 59^{circ} mathrm{C} ) in 4 minutes. The time taken by the body to cool from ( 51^{circ} mathrm{C} ) to ( 49^{circ} mathrm{C} ) will be about A. 5 minutes B. 8 minutes c. 4 minutes D. 6 minutes | 11 |

1369 | Water falls from a height of ( 500 mathrm{m} ) What is approximately the rise temperature of water at bottom if whole energy is used to heat the water? A ( .5000^{circ} mathrm{C} ) B. ( 500^{circ} mathrm{C} ) c. ( 1.17^{circ} mathrm{C} ) D. ( 0.23^{circ} mathrm{C} ) | 11 |

1370 | Two liquids have the densities in the ratio of 1: 2 and specific heats in the ratio of ( 2: 1 . ) The ratio of thermal capacity of equal volume of those liquids is: A . 1: 1 B. 1: 4 c. 4: 1 D. 2: 1 | 11 |

1371 | If a metallic sphere gets cooled from ( 62^{circ} mathrm{C} ) to ( 50^{circ} mathrm{C} ) in ( 10 mathrm{min} ) and in the next 10 min gets cooled to ( 42^{circ} mathrm{C} ), then the temperature of the surroundings is A ( cdot 30^{circ} mathrm{C} ) B . ( 36^{circ} mathrm{C} ) ( mathbf{c} cdot 26^{circ} C ) D. ( 20^{circ} mathrm{C} ) | 11 |

1372 | One calorie is defined as the heat required to raise the temperature of 1 gm of water by ( 1^{circ} mathrm{C} ) in a certain pressure. The pressure is A. ( 76 m m ) of ( H g ) в. ( 760 mathrm{cm} ) of ( mathrm{Hg} ) c. ( 760 mathrm{mm} ) of ( mathrm{Hg} ) D. ( 7.6 mathrm{m} ) of ( mathrm{Hg} ) | 11 |

1373 | In the Ingen Hausz’s experiment, the wax melts up to lengths ( 10 mathrm{cm} ) and ( 25 c m ) on two identical rods of different materials. The ratio of thermal conductivities of the two materials is A . 1: 6.25 B. 6.25: 1 c. ( 1: sqrt{2.5} ) D. 1: 2.5 | 11 |

1374 | Q Type your question. other end of rod is at temperature ( T_{2} ) and is exposed to atmosphere. The temperature of atmospheric is ( T_{s} . ) The lateral part of rod is insulated. If ( boldsymbol{T}_{2}- ) ( boldsymbol{T}_{s}<<boldsymbol{T}_{s}, boldsymbol{T}_{2}=boldsymbol{T}_{s}+boldsymbol{Delta} ) Т ( boldsymbol{&} boldsymbol{Delta} boldsymbol{T} propto ) ( left(T_{1}-T_{s}right), ) find proportionality constant of given equation. The heat loss to atmosphere is through radiation only and the emissivity of the rod is ( varepsilon ). ( A ) в. ( c ) D. | 11 |

1375 | : A sphere Il: A cube III: A thin circular plate; All made of the same material having the same mass are initially heated to ( 200^{0} mathrm{C} . ) Identify the order in which the objects cool faster when left in air at room temperature: A. III,II and I B. II, I and III c. ।, ॥ and III D. II, III and I | 11 |

1376 | State whether given statement is True or False Black bodies are good absorbers of radiant heat. A. True B. False | 11 |

1377 | Define the term heat: A. the condition or quality of being hot B. the sensation of warmth or hotness C. the degree of hotness; temperature D. all of the above | 11 |

1378 | depends on mass and kind of material of the body. A. specific heat B. Heat capacity c. Temperature D. kinetic energy | 11 |

1379 | Boiling of liquid can take place at any temperature. A . True B. False | 11 |

1380 | Which of the following halogen can be purified by sublimation? ( mathbf{A} cdot F_{2} ) в. ( C l_{2} ) c. ( B r_{2} ) D. ( I_{2} ) | 11 |

1381 | In a certain gas, the ratio of the speed of sound and root mean square speed is ( frac{mathbf{5}}{mathbf{g}} ) The molar heat capacity of the gas in a process given by ( mathrm{PT}= ) constant is (Take ( R=2 ) cal/mole ( K ) ). Treat the gas as ¡deal. ( A cdot frac{f+2}{f} ) в. ( frac{3 R}{2} ) c. ( frac{5 R}{2} ) D. ( frac{7 R}{2} ) | 11 |

1382 | A stationary object at ( 4^{circ} mathrm{C} ) weighing 3.5 kg falls from a height ( 2000 mathrm{m} ) on a snow mountain at ( 0^{circ} mathrm{C} ). If the temperature of the object before comes to rest immediately ( left(g=10 m / s^{2}right) ) and latent heat of ice ( =3.5 times 10^{6} J / s ) ), then the object : A. 2 gm of ice B. 200 gm of ice c. 20 gm of ice D. 2 kg of ice | 11 |

1383 | How are convection currents formed when a liquid is heated? | 11 |

1384 | Naphthalene is a volatile solid. It is best purified by: A. Crystallisation B. Distillation c. Steam distillation D. Sublimation | 11 |

1385 | The pendulum of a clock is made of brass. If the clock keeps correct time at ( 20^{circ} mathrm{C} ). Calculate how many seconds per day will it loose at ( 35^{circ} mathrm{C} ) ( ( alpha ) for brass = ( left.2 times 10^{-5 o} Cright) ) A . 12.96 B. 1.29 s c. ( 129.6 mathrm{s} ) D. 8.64 | 11 |

1386 | Which of the following is wrongly matched? A. Barometer-Pressure B. Lactometer-Milk c. coulomb’s law-charges D. Humidity -Calorimeter | 11 |

1387 | Sublimation is a process in which a solid. A. Changes into another allotropic form B. Changes into liquid form c. changes into vapour form D. None of the above | 11 |

1388 | If two bodies ( A ) and ( B ) of ( 50^{0} C ) comes in contact with each other. The heat will flow ( A cdot ) Body ( A rightarrow ) Body ( B ) B. Body B ( rightarrow ) Body A c. nowhere D. from both the bodies | 11 |

1389 | Choose the correct statements among the following: This question has multiple correct options A. Heat flow between two bodies is due to difference in their temperatures. B. The change in temperature in celsius and Kelvin scale are same. C. Kelvin is the standard temperature scale. D. Heat is cause while temperature is the effect. | 11 |

1390 | The volume of a gas at constant pressure increases by ( 2 % ) when the temperature is increased by ( 5^{0} ) K, It’s initial temperature is ( mathbf{A} cdot 100^{0} mathbf{K} ) B . 250^ K ( c cdot 500^{0} mathrm{K} ) D. ( 1000^{circ} ) к | 11 |

1391 | A thermometer graduated according to a linear scale reads a value ( x_{0} ) when in contact with boiling water, and ( boldsymbol{x}_{mathbf{0}} / mathbf{3} ) when in contact with ice. What is the temperature of an object in ( 0^{circ} mathrm{C} ), if this thermometer in the contact with the object reads ( boldsymbol{x}_{0} / 2 ? ) A . 35 B . 25 c. 60 D. 40 | 11 |

1392 | A metal rod ( A ) of length ( ell_{0} ) expands by ( Delta ell ) when its temperature is raised by ( 100^{circ} mathrm{C} . ) Another rod ( B ) of different metal of length ( 2 ell_{0} ) expands by ( Delta ell / 2 ) for same rise in temperature. A third rod ( C ) of length ( 3 ell_{0} ) is made up of pieces of rods ( A ) and ( B ) placed end to end expands by ( 2 Delta ell ) on heating through 100 K.The length of each portion of the composite rod is: A ( cdot frac{5}{3} ell_{0}, frac{4}{3} ell_{0} ) B. ( ell_{0}, 2 ell_{0} ) c. ( frac{3 ell_{0}}{2}, frac{3 ell_{0}}{2} ) D ( cdot frac{2}{3} ell_{0}, frac{7}{3} ell_{0} ) | 11 |

1393 | The density of an ideal gas ( mathbf{A} . ) is directly proportional to its pressure and absolute temperature B. is directly proportional to its pressure and inversely proportional to its absolute temperature C. is inversely proportional to its pressure and directly proportional to its absolute temperature D. is inversely proportional to both its pressure and absolute temperature of the gas | 11 |

1394 | The temperature of a radiating body increase by ( 30 % ). Then the increase in the amount of radiation is ( mathbf{A} cdot 185 % ) B. ( 285 % ) c. ( 325 % ) D. ( 130 % ) | 11 |

1395 | A sphere of aluminium of mass 0.047 kg placed for sufficient time in a vessel containing boiling water, so that the sphere is at ( 100^{circ} mathrm{C} ).It is then immediately transferred to ( 0.14 mathrm{kg} ) copper calorimeter containing ( 0.25 mathrm{kg} ) of water at ( 20^{circ} mathrm{C} ). The temperature of water rises and attains a steady state at ( 23^{circ} C ). Calculate the specific ( h ) capacity of aluminium. Given :specific heat capacity of water is 4186 ( J k g^{-1} K^{-1} ) specific heat capacity of copper calorimeter is 385 Jkg( ^{-1} boldsymbol{K}^{-1} ) | 11 |

1396 | 1 volt is equivalent to: A ( cdot frac{text { newton }}{text { second }} ) B. ( frac{text { newton }}{text { coulomb }} ) c. ( frac{text { joule }}{text { coulomb }} ) D. ( frac{text { joule }}{text { second }} ) | 11 |

1397 | According to law of conservation of energy, heat energy is transformed into which two types of energy? A. Kinetic and potential energy B. Mechanical and potential energy c. Kinetic and thermal energy D. Nuclear and potential energy | 11 |

1398 | Among the following liquids, specific heat is minimum for A. acetone B. water c. bromine (liquid) D. ammonia (liquid) | 11 |

1399 | Arrange the following steps in the proper order to explain how a sea breeze occurs, near coastal regions. (a) The temperature of land rises rapidly as compared to sea, because the specific heat capacity of land is five times less than that of water. (b) Due to the low pressure over the land mass, the cool air over the sea starts blowing towards the land. (c) The sun shines equally on the land mass and sea, giving equal amount of heat energy to both. (d) The air above the land becomes hot and light, rises up and hence creates the low pressure over the land. ( A cdot a d c b ) B. ( operatorname{cd} a b ) ( c cdot c a b d ) D. ( c ) a d b | 11 |

1400 | State whether true or false: The quantity of heat required by one gram of a substance to raise its temperature by ( 1 mathrm{K} ) is called its specific heat(s). A. True B. False | 11 |

1401 | In outer space there are 10 molecules per ( mathrm{cm}^{3} ) on an average and the temperature there is 3 K. The average pressure of this light gas is ( mathbf{A} cdot 10^{5} N m^{-2} ) В. ( 5 times 10^{-14} mathrm{Nm}^{-2} ) c. ( 0.4 times 10^{-16} N m^{-2} ) D. ( 4.14 times 10^{-16} mathrm{Nm}^{-2} ) | 11 |

1402 | Why is oil preferred for frying and not water? | 11 |

1403 | A hot and a cold body are kept in vacuum separated from each other. Which of the following causes decrease in temperature of the hot body? A. conduction B. radiations c. convection D. the temperature of the bodies remain unchanged | 11 |

1404 | A mass of material exists in its solid form at its melting temperature ( 10^{circ} mathrm{C} ) The following processes then occur to the material: Process 1: An amount of thermal energy What is the ratio of the latent heat of | 11 |

1405 | How much water has he to consume in 30 min running if the heat is eliminated through perspiration? A . ( 0.6 L ) в. ( 0.7 L ) c. ( 0.8 L ) D. ( 0.9 L ) E. none of these | 11 |

1406 | Five blocks ( boldsymbol{A}, boldsymbol{B}, boldsymbol{C}, boldsymbol{D} ) & ( boldsymbol{E} ) of equal masses but made of different substances as shown in above figure, are heated to ( 100^{circ} mathrm{C} ) and placed on separate ( 10 k g ) blocks of ice that are at a temperature of ( 0^{circ} mathrm{C} ). Identify which substance melts the greatest amount of ice? A. The substance with the lowest specific heat B. The substance with the highest specific heat C. The substance with the greatest surface area D. The substance with the smallest surface area E. The substance that started with the highest temperature | 11 |

1407 | State True or False : The larger the exposed surface area, lower is the rate of evaporation. A. True B. False | 11 |

1408 | Three metal rods made of copper, aluminium and brass, each ( 20 mathrm{cm} ) long and ( 4 mathrm{cm} ) in diameter, are maintained at 100 and ( 0^{circ} mathrm{C} ) respectively. Assume that the thermal conductivity of copper is twice that of aluminium and four times that of brass. The approximately equilibrium temperatures of the copper -aluminium and aluminium – brass junctions are respectively. A ( cdot 68^{circ} mathrm{C} ) and ( 75^{circ} mathrm{C} ) B. ( 75^{circ} mathrm{C} ) and ( 68^{circ} mathrm{C} ) ( mathrm{c} cdot 57^{circ} mathrm{C} ) and ( 86^{circ} mathrm{C} ) D. ( 86^{circ} mathrm{C} ) and ( 57^{circ} mathrm{C} ) | 11 |

1409 | Spheres ( P ) and ( Q ) are uniformly constructed from the same material which is a good conductor of heat and the radius of ( Q ) is thrice the radius of ( P ). The rate of fall of temperature of ( P ) is ( x ) times that of ( Q . ) When both are at the same surface temperature, the value of ( x ) is : A ( cdot frac{1}{4} ) B. ( frac{1}{3} ) ( c .3 ) D. | 11 |

1410 | When the liquid is getting converted into solid, then what is the latent heat involved? | 11 |

1411 | An ideal gas follows a process described by ( boldsymbol{P} boldsymbol{V}^{2}=boldsymbol{C} ) from ( left(boldsymbol{P}_{1}, boldsymbol{V}_{1}, boldsymbol{T}_{1}right) ) to ( left(P_{2}, V_{2}, T_{2}right)(mathrm{C} text { is a constant }) . ) Then A. If ( P_{1}>P_{2} ) then ( T_{2}>T_{1} ) B. If ( V_{2}>V_{1} ) then ( T_{2}V_{1} ) then ( T_{2}>T_{1} ) D. If ( P_{1}>P_{2} ) then ( V_{2}>V_{2} ) | 11 |

1412 | How is the volume of water affected when it boils at ( 100^{circ} mathrm{C} ? ) | 11 |

1413 | The densities of two substances are in the ratio 1: 2 and their specific heat in the ratio ( 2: 3 . ) Compare their thermal capacities if their volumes are in the ratio 3: 4 | 11 |

1414 | A thermos bottle containing coffee is vigorously shaken. If the coffee is considered as a system, then the temperature of the coffee will A. increase slightly B. fall c. remain the same D. never be determined | 11 |

1415 | Absolute zero corresponds to: A . ( -273 K ) В. ( -273^{circ} mathrm{C} ) c. ( 273^{circ} mathrm{F} ) D. None of these | 11 |

1416 | Ventilators are provided at the top of a room: A. To bring oxygen for breathing. B. So that sunlight may enter the room. C. To maintain convectional currents to keep the air fresh in the room. D. To provide an outlet for carbon dioxide. | 11 |

1417 | Fill up the blank with suitable words Expression for latent heat of fusion is | 11 |

1418 | If we place our hand below a lighted electric bulb. We feel warmer because of A. convection B. radiation c. conduction D. both A and B | 11 |

1419 | The fastest mode of transfer of heat is A. conduction B. convection c. radiation D. all the above three | 11 |

1420 | State whether given statement is True or False Air conducts heat A. True B. False | 11 |

1421 | ( 1 mathrm{kg} ) of water is supplied ( 630 mathrm{kJ} ) of energy. Specific heat of water is 4200 J/kg ( ^{circ} ) C.So calculate the rise in temperature of 1 kg water A ( cdot 40^{circ} mathrm{C} ) B . ( 60^{circ} mathrm{C} ) ( mathbf{c} cdot 80^{circ} mathrm{C} ) D. ( 150^{circ} mathrm{C} ) | 11 |

1422 | Heat is transmitted from higher to lower temperature through actual mass motion of the molecules in A. conduction B. convection c. radiation D. None of these | 11 |

1423 | ( 42000 J ) of heat energy is supplied to ( 175 g ) of iron at ( 30^{circ} C, ) when the final temperature recorded is ( 430^{circ} . ) Calculate specific heat capacity of iron A ( cdot 600 J g^{-1} circ C^{-1} ) B. ( 0.6 J g^{-1} ) о ( C^{-1} ) c. ( 60 J g^{-1} ) о ( C^{-1} ) D. ( 6 J g^{-1} ) о ( C^{-1} ) | 11 |

1424 | An ice cube of mass ( 0.1 mathrm{kg} ) at ( 0^{circ} mathrm{C} ) is placed in an isolated container which is ( operatorname{at} 227^{circ} mathrm{C} . ) The specific heat ( S ) of the container varies with temperature ( boldsymbol{T} ) according to the empirical relation ( S= ) ( boldsymbol{A}+boldsymbol{B} boldsymbol{T}, ) where ( boldsymbol{A}=mathbf{1 0 0} boldsymbol{c a l} / boldsymbol{k g}-boldsymbol{K} ) and ( B=2 times 10^{-2} c a l / k g-K^{2} . ) If the final temperature of the container is ( 27^{circ} mathrm{C}, ) determine the mass of the container. (Latent heat of fusion of water ( =8 times 10^{4} c a l / k g-K, ) Specific heat of water ( left.=10^{3} c a l / k g-Kright) ) | 11 |

1425 | You are provided with a mixture containing sand, iron filings, ammonium chloride and sodium chloride. Describe the procedures you would use to separate these constituents from the mixture? | 11 |

1426 | The temperature at which the volume of ideal gas is zero is: A ( .+274 K ) В. ( -273^{circ} mathrm{C} ) ( c cdot 273^{circ} C ) D. ( -273 K ) | 11 |

1427 | Which of the following is incorrect relation fot a perfect gas? A. ( quadleft(frac{delta U}{d V}right)_{T}=0 ) в. ( quadleft(frac{^{frac{0}{0} H}{delta P}}right)_{T}=0 ) ( begin{array}{ll}text { c. } & left(frac{delta T}{delta P}right)_{H}=0end{array} ) D. ( quadleft(frac{tilde{sigma} U}{delta T}right)_{V}=0 ) | 11 |

1428 | Which one of the following does not undergo sublimation? A. iodine B. sodium chloride c. ammonium chloride D. None of these | 11 |

1429 | 1 calorie ( = ) A. amount of heat energy required to transform ( 1 mathrm{kg} ) of ice into water at ( 0^{circ} mathrm{C} ) B. amount of heat energy required to raise the temperature of ( 1 k g ) of water through ( 1^{circ} C ) C. amount of heat required to raise the temperature of ( 1 g ) of water through ( 1^{circ} mathrm{C} ) D. quantity of work done at atmospheric pressure | 11 |

1430 | Ebonite handles would not permit heat to be conducted from hot utensil to hand. | 11 |

1431 | State True or False: Due to high specific heat index of water it helps in regulating the rate of temperature change between seasons. A . True B. False | 11 |

1432 | According to Newton’s law of cooling, the rate of cooling is proportional to ( (Delta theta)^{n}, ) where ( Delta theta ) is the temperature difference between the body and the surroundings and ( n ) is equal to A. Three B. Two c. one D. Four | 11 |

1433 | (1) Latent heat of steam is 540 cal/gm. Express this in Sl units. (2) A liquid has a mass of ( 200 mathrm{gm} ) and a specific heat capacity of ( 0.8 c a l / g m / C^{o} ) Find water equivalent of the liquid. | 11 |

1434 | The heat capacity of a body depends on This question has multiple correct options A. the heat given B. the temperature raised c. the mass of the body D. the material of the body | 11 |

1435 | ( A 2 k g ) copper block is heated to ( 500^{circ} mathrm{C} ) and then it is placed on a large block of ice at ( 0^{circ} mathrm{C} ). If the specific heat capacity of copper is ( 400 mathrm{J} / mathrm{kg} / mathrm{C} ) and latent heat of water is ( 3.5 times 10^{5} J / k g . ) The amount of ice that can melt is: ( A cdot 7 / 8 mathrm{kg} ) B. 7/5 kg c. ( 8 / 7 mathrm{kg} ) ( D cdot 5 / 7 mathrm{kg} ) | 11 |

1436 | A graph is plotted by taking ( ^{circ} boldsymbol{C} ) along the Y-axis and ( ^{circ} boldsymbol{F} ) along the X-axis. It is a/an A. parabola B. straight line c. ellipse D. circle | 11 |

1437 | A calorimeter of water equivalent 5 g has water of mass 55 g upto a certain level. Another identical calorimeter has a liquid of mass 38 g up to same level. As both of them cool in the same surroundings from ( 50^{circ} mathrm{C} ) to ( 46^{circ} mathrm{C}, ) water takes 80 s whereas the liquid takes 32 s to cool. If the specific heat of water is 1 cal/g-o ( C ), the specific heat of the liquid in cal/g-o ( C ) is : A . 0.8 B. 0.4 ( c cdot 0.5 ) D. 0.2 | 11 |

1438 | A body colls from ( 70^{circ} mathrm{C} ) to ( 60^{circ} mathrm{C} ) in 10 minutes when kept in air at ( 30^{circ} mathrm{C} ). In the next ten minutes its temprature will fall A . Below ( 50^{circ} mathrm{C} ) В. ( operatorname{To} 50^{circ} mathrm{C} ) c. To above ( 52.5^{circ} mathrm{C} ) D. To any of the above depending on its specific heat | 11 |

1439 | On a new scale of temperature (which is linear) and called the ( mathrm{W} ) scale, the freezing and boiling points of water are ( 39^{circ} mathrm{W} ) and ( 239^{circ} mathrm{W} ) respectively. What will be the temperature on the new scale, corresponding to a temperature of ( 39^{circ} mathrm{C} ) on the Celsius scale? В . ( 139^{circ} mathrm{W} ) ( mathbf{c} cdot 78^{circ} W ) D. ( 117^{circ} W ) | 11 |

1440 | Why is it not possible to cool the liquid at absolute OK? | 11 |

1441 | A gas is filled in a container at any temperature and at pressure ( 76 mathrm{cm} ) of Hg. If at the same temperature the mass of gas is increased by ( 50 % ) then the resultant pressure will be ( A .38 mathrm{cm} ) of ( mathrm{Hg} ) B. 76 ( mathrm{cm} ) of ( mathrm{Hg} ) c. ( 114 mathrm{cm} ) of ( mathrm{Hg} ) D. ( 152 mathrm{cm} ) of ( mathrm{Hg} ) | 11 |

1442 | A constant volume gas thermometer works on: A. Archimedes’ principle B. Pascal’s law c. Boyle’s law D. charles’ Law | 11 |

1443 | In the gas equation ( P V=R T ), Vis the volume of A. 1 mol of gas B. ( 1 mathrm{g} ) of gas ( c cdot operatorname{gas} ) D. 1 litre of gas | 11 |

1444 | At which temperature do the readings of the celcius and the Fahrenheit scales coincide? A . 0 в. 100 ( c .-40 ) D. -80 E. None of the above | 11 |

1445 | A child running a temperature of ( 101^{0} F ) is given an antipyrin (i.e. a medicine that lowers fever ) which causes an increases in the rate of evaporation of sweat from his body. If the fever is brought down to ( 98^{circ} F ) in 20 min, what is the average rate of extra evaporation caused, by the drug. Assume the evaporation mechanism to be the only way by which heat is lost. The mass of the child is 30 kg. The specific heat of human body is approximately the same as that of water and latent heat of evaporation of water at that temperature is about 580 cal ( g^{-1} ) | 11 |

1446 | A perfect gas at ( 27^{0} C ) is heated at constant pressure so as to double its volume. The increase in temperature of the gas will be ( mathbf{A} cdot 300^{0} C ) B . ( 54^{circ} mathrm{C} ) ( mathbf{c} cdot 327^{0} C ) D. ( 600^{circ} mathrm{C} ) | 11 |

1447 | The amount of heat energy required to raise the temperature off 1 kg of water through ( 1^{circ} C ) is A. Calorie B. Thermal capacity c. specific Heat D. Kilo calorie | 11 |

1448 | In convection process rate of heat transfer is compared in the option between gas and liquid,choose the correct statement A. gas convects more as compared to other B. liquid convects more as compared to other C. liquid convects more as compared to other only if certain factors assists water D. none of the above | 11 |

1449 | At what temperature do the Celsius and Fahrenheit reading have the same numerical value? | 11 |

1450 | The temperature at which a body does not radiate energy ( mathbf{A} cdot 0^{0} mathbf{C} ) в. ( 0 K ) c. ( 273 K ) D. ( 4^{circ} ) С | 11 |

1451 | For any substance, why does the temperature remain constant during the change of state? | 11 |

1452 | A closed hollow insulated cylinder is filled with gas at ( 0^{0} mathrm{C} ) and also contains an insulated piston of negligible weight and negligible thickness at the the middle point. The gas at one side of the piston is heated to ( 100^{circ} mathrm{C} ). If the piston moves ( 5 mathrm{cm} ), the length of the hollow cylinder is A. ( 13.65 mathrm{cm} ) B. 27.3 cm c. ( 64.6 mathrm{cm} ) D. ( 54.6 mathrm{cm} ) | 11 |

1453 | A rigid container has a hole in its wall. When the container is evacuated, its weight is 100 gm. When someair is filled in it at ( 27 C ), its weight becomes 200 gm. Now the temperature of air inside is increased by ( Delta mathrm{T} ), the weight becomes 150 gm. ( Delta ) T should be : A .27 в. ( frac{27^{circ}}{4} ) с ( c .300 ) D. 327 | 11 |

1454 | Assertion The equivalent thermal conductivity of two plates of same thickness in contact is less than the smaller value of thermal conductivity Reason For two plates of equal thickness in contact the equivalent thermal conductivity is given by: ( frac{1}{K}=frac{1}{K}_{1}+frac{1}{K} ) A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 11 |

1455 | The temperature of a normal human being is A ( cdot 31^{circ} mathrm{C} ) В. ( 37^{circ} mathrm{C} ) ( mathbf{c} cdot 20^{circ} C ) D. ( 50^{circ} mathrm{C} ) | 11 |

1456 | Two spherical stars ( A ) and ( B ) emit blackbody radiation. The radius of ( A ) is 400 times that of ( B ) and ( A ) emits ( 10^{4} ) times the power emitted from ( B ). The ratio ( left(frac{boldsymbol{lambda}_{boldsymbol{A}}}{boldsymbol{lambda}_{boldsymbol{B}}}right) ) of their wavelengths ( boldsymbol{lambda}_{boldsymbol{A}} ) and ( lambda_{B} ) at which the peaks occur in their respective radiation curves is | 11 |

1457 | On cubical expansion A. Length increases B. Breadth increases ( c . ) Both D. None | 11 |

1458 | The process of warming of earth by sun is A. Conduction B. Convertion c. Radiation D. None | 11 |

1459 | A uniform slab of dimension ( 10 mathrm{cm} times ) ( 10 mathrm{cm} times 1 mathrm{cm} ) is kept between two heat reservoirs at temperatures ( 10^{0} C ) and ( 90^{0} C ) The larger surface areas touch the reservoirs. The thermal conductivity of the material is ( 0.80 W / m-^{0} C . ) Find the amount of heat flowing through the slab per second. | 11 |

1460 | Boiling point of water at normal atmospheric pressure is ( mathbf{A} cdot 0^{circ} C ) B. ( 100^{circ} mathrm{C} ) c. ( 110^{circ} mathrm{C} ) D. ( -4^{circ} mathrm{C} ) | 11 |

1461 | From a disc of radius ( R ) and mass ( M, ) a circular hole of diameter ( R ), whose rim passes through the centre is cut. What is the moment of inertia of the remaining part of the disc about a perpendicular axis, passing through the centre? ( ^{A} cdot frac{9 M R^{2}}{32} ) в. ( frac{15 M R^{2}}{32} ) c. ( frac{13 M R^{2}}{32} ) D. ( frac{11 M R^{2}}{32} ) | 11 |

1462 | In an experiment on the specific heat of a metal, a ( 0.20 mathrm{kg} ) block of the metal at ( 150^{circ} mathrm{C} ) is dropped in a copper calorimeter (of water equivalent ( 0.025 k g ) ) containing ( 150 c m^{3} ) of water ( operatorname{at} 27^{circ} mathrm{C} . ) The final temperature is ( 40^{circ} mathrm{C} ) Compute the specific heat of the metal. If heat losses to the surroundings are not negligible, is your answer greater or smaller than the actual value for specific heat of the metal? | 11 |

1463 | A brass rod of length ( 30 mathrm{cm} ) is joined to a copper rod of length ( 60 mathrm{cm} ). The two rods are of the same thickness and at initial temperature of ( 20^{circ} mathrm{C} ). What is the change in length of the combined rod, when the same is heated to ( 160^{circ} mathrm{C} ) Coefficients of linear expansion of brass | 11 |

1464 | Ice blocks covered with rice husk as air trapped avoids heat flow by | 11 |

1465 | When 1 g of ice melts at ( 0^{circ} boldsymbol{C} ) A. 80 cal of heat is liberated B. 80 cal of heat is absorbed c. no heat is required D. none of these | 11 |

1466 | A hot body is allowed to cool. The surrounding temperature is constant at ( 30^{circ} mathrm{C} . ) The body takes time ( t_{1} ) to cool from ( 90^{circ} mathrm{C} ) to ( 89^{circ} mathrm{C} ) and time ( t_{2} ) to cool from ( 60^{circ} mathrm{C} ) to ( 59.5^{circ} mathrm{C} ). Then A ( cdot t_{2}=2 t_{1} ) B. ( t_{2}=frac{t_{1}}{2} ) c. ( t_{2}=4 t ) D. ( t_{2}=t_{1} ) | 11 |

1467 | Sublimation is used to purify: A. plasma B. gases c. solids D. liquids | 11 |

1468 | Two bodies are in thermal equilibrium if they have the same: A. temperatures B. amount of heat c. specific heat D. thermal capacity | 11 |

1469 | Assertion A piece of paper wrapped tightly around a wooden rod gets charred quickly when held over a flame compared to a piece of paper wrapped around a brass rod. Reason Thermal conductivity of wood is smaller than the conductivity of brass A. Assertion is false and Reason is True B. Reason is false and assertion is True. C. Both Assertion and Reason are True and reason correctly explains assertion D. Both Assertion and Reason are True but assertion does not correctly explain reason | 11 |

1470 | Temperature at which Fahrenheit and kelvin pair of scales give the same reading will be A ( . theta=-40 ) B . ( theta=40 ) c. ( theta=574.25 ) ( mathbf{D} cdot theta=512.45 ) | 11 |

1471 | In an experiment on the specific heat of a metal a ( 0.20 mathrm{kg} ) block of the metal at ( 150^{circ} mathrm{C} ) is dropped in a copper calorimeter (of water equivalent 0.025 kg) containing ( 150 mathrm{cm}^{3} ) of water at ( 27^{circ} mathrm{C} . ) The final temperature is ( 40^{circ} mathrm{C} ) Compute the specific heat of the metal. If heat losses to the surroundings are not negligible, is your answer greater or smaller than the actual value for specific heat of the metal? | 11 |

1472 | Calculate the specific heat of the material if material of 10 kilograms raises temperature ( 2^{circ} C ) when 2000 joules of heat is added. A ( cdot 0.01 J / k g cdot^{circ} C ) в. ( 0.2 J / k g cdot^{circ} C ) ( mathbf{c} cdot 50 J / k g cdot^{circ} C ) D. ( 100 J / k g cdot^{circ} C ) E ( cdot 200 J / k g cdot^{circ} C ) | 11 |

1473 | A liquid of mass ( mathrm{m} ) and specific heat ( mathrm{c} ) is heated to temperature 2T. Another liquid of mass m/2 specific heat ( 2 c ) is heated to a temperature T. If these two liquids are nixed, the resulting temperature mixture is ( A cdot(2 / 3) T ) B. (8/5) T ( c cdot(3 / 5) T ) D. (3/ 2)T | 11 |

1474 | 500 g of water at ( 100^{circ} C ) is mixed with ( 300 mathrm{g} ) at ( 30^{circ} mathrm{C} ). Find the temperature of the mixture. Specific heat of water ( = ) ( 4.2 J g^{-1} o C^{-1} ) A ( .73 .8^{circ} mathrm{C} ) B. ( 53.8^{circ} mathrm{C} ) ( mathbf{c} cdot 40^{circ} mathrm{C} ) D. ( 60^{circ} mathrm{C} ) | 11 |

1475 | Assertion Two bodies at different temperatures, if brought in thermal contact do not necessarily settle to the mean temperature. Reason The two bodies may have different thermal capacities. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 11 |

1476 | Name a substance which, on heating, leaves behind no residue. A. Methane gas B. Ammonium nitrate c. Camphor D. All of the above | 11 |

1477 | If ( alpha ) represent linear expansion, ( beta ) represent superficial expansion and ( gamma ) represent cubical expansion, then choose the correct statement: B. ( alpha: beta: gamma::: 2: 3: 1 ) c. ( alpha: beta: gamma:: 3: 1: 1 ) D. ( alpha: beta: gamma:: 1: 2: 3 ) | 11 |

1478 | The upper and lower fixed points of a thermometer are separated by ( 180 mathrm{mm} ) What is the temperature in Celcius if the length of the mercury thread is 90 ( mathrm{mm} ) above the lower fixed point? ( mathbf{A} cdot 90^{circ} C ) B . ( 50^{circ} mathrm{C} ) ( mathbf{c} cdot 45^{circ} C ) D. ( 58^{circ} mathrm{C} ) | 11 |

1479 | A beaker contains 40 g of water at ( 20^{circ} mathrm{C} ) Now 50 g of ice is put into the beaker. The resulting temperature will be ( mathbf{A} cdot-7^{circ} C ) B . ( 0^{circ} mathrm{C} ) ( mathbf{c} cdot 10^{circ} mathrm{C} ) D. ( 1.5^{circ} mathrm{C} ) | 11 |

1480 | A liquid with coefficient of volume expansion ( gamma ) is filled in a container of a material having coefficient of linear expansion ( alpha ). If the liquid overflows on heating, then: A ( cdot gamma=3 alpha ) в. ( gamma>3 alpha ) c. ( gamma<3 alpha ) D . ( gamma=a^{3} ) | 11 |

1481 | Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities ( K ) and ( 2 K, ) respectively.The equivalent thermal conductivity of the slab is A ( cdot 2 / 6 K ) B. ( sqrt{2} ) к ( c .3 K ) D. ( 4 / 3 K ) | 11 |

1482 | The highest temperatures recorded in 4 different countries are listed below What is the highest temperature listed above? A ( cdot 127.6^{circ} ) B. ( 114.8^{circ} mathrm{F} ) c. ( 136.4^{circ} mathrm{F} ) D . 134.0 ( ^{circ} ) | 11 |

1483 | A body cools from ( 70^{circ} mathrm{C} ) to ( 50^{circ} mathrm{C} ) in 5 minutes. Temperature of surroundings is ( 20^{circ} mathrm{C} . ) Its temperature after next 10 minutes is A ( cdot 26^{circ} mathrm{C} ) В. ( 30^{circ} mathrm{C} ) ( mathbf{c} cdot 35^{circ} C ) D. ( 45^{circ} mathrm{C} ) | 11 |

1484 | For any gas the pressure coefficient ( (beta) ) is equal to the volume coefficient ( ( alpha ) ). This can be proved by: A. Charle’s law B. Boyle’s law c. Grahm’s law D. Avogadro’s number | 11 |

1485 | The specific latent heat of ice is 383 ( J g^{-1} ) A. True B. False | 11 |

1486 | The air density at Mount Everest is less than that at the sea level. It is found by mountaineers that for one trip lasting a few hours, the extra oxygen needed by them corresponds to ( 30,000 c c ) at sea level (pressure 1 atmosphere, temperature ( 27^{circ} mathrm{C} ) ). Assume that the temperature around Mount Everest is – ( 73^{circ} mathrm{C} ) and that the oxygen cylinder has a capacity of 5.2 litters. The pressure at which oxygen be filled (at site) in the cylinder is A. 3.86 atm B. 5.00 atm c. 5.77 atm D. 1 atm | 11 |

1487 | State True and False : During the day, land gets heated faster than water. A. True B. False | 11 |

1488 | Describe an experiment to demonstrate the thermal expansion in a gas. | 11 |

1489 | A glass test tube containing some water is immersed in boiling water so that the upper end of the test is outside. It is found that water in the test tube does not boil even if it is kept there for a long time. Why? | 11 |

1490 | What do you mean by: The specific heat capacity of copper is ( 0.4 J g^{-1} K^{-1} ) A . ( 0.4 J ) B. 2 ( c .3 ) D. | 11 |

1491 | ( A 30 g ) of ice that is at a temperature ( 0^{circ} mathrm{C} ) falls 6 meters from the eaves of a house to the ground below. If ( 5 % ) of the kinetic energy that the ice possesses when it strikes the ground converts into heat, Identify the correct statement? (Note: ( left.boldsymbol{H}_{f} boldsymbol{w} boldsymbol{a} boldsymbol{t} boldsymbol{e} boldsymbol{r} boldsymbol{0} . boldsymbol{3} boldsymbol{3} boldsymbol{5} boldsymbol{J} / boldsymbol{g}right) ) A. The ice would become colder during the fall; therefore, no ice would melt B. This would not happen because it would break the law of conservation of mass c. Less than ( .3 g ) of the ice would melt D. The frictional work done to stop the icicle’s fall would use up all the energy and leave none for anything else E. The icicle would shatter and the energy would convert into momentum | 11 |

1492 | Explain why : (a) A body with large reflectivity is a poor emitter (b) A brass tumbler feels much colder than a wooden tray on a chilly day (c) An optical pyrometer (for measuring high temperatures ) calibrated for an ideal black body radiation gives too low a value for the temperature of a red hot iron piece in the open but gives a correct value for the temperature when the same piece is in the furnace (d) The earth without its atmosphere would be inhospitably cold (e) Heating systems based on circulation of steam are more efficient in warming a building than those based on circulation of hot water | 11 |

1493 | At a given temperature and pressure 64 ( mathrm{gm} ) of Oxygen and ( mathrm{X} mathrm{gm} ) of ( mathrm{H}_{2} ) occupy the same volume. Then ( x=ldots . . ) gm ( A cdot 1 ) B. 2 ( c cdot 3 ) D. 4 | 11 |

1494 | The unit of Newton’s cooling constant is A ( cdot c a l / s ) B cdot ( operatorname{cal} / s^{circ} C ) c. ( c a l /^{circ} C ) D. ( ^{o} C^{-1} ) | 11 |

1495 | Water at ( 0^{circ} C ), contained in a closed vessel, is abruptly opened in an evacuated chamber specific latent heats of fusion and vapourization at ( 0^{circ} C ) are in the ratio ( lambda: 1, ) the water evaporated will be : | 11 |

1496 | When a solid directly turns into gaseous state, it is called: A. sublimation B. condensation c. polymerisation D. melting | 11 |

1497 | A steel beam is 5 m long at a temperature of ( 20^{circ} mathrm{C} . ) On a hot day, the temperature rises to ( 40^{circ} mathrm{C} ). What is the change in the length of the beam due to thermal expansion? Coefficient of linear expansion of stee ( boldsymbol{alpha}=mathbf{1} cdot mathbf{2} times mathbf{1} mathbf{0}^{-mathbf{5}} boldsymbol{o} boldsymbol{C}^{-mathbf{1}} ) | 11 |

1498 | When you heat the water in a pot, it boils. What do you infer from above observation? A. Heat is a form of energy B. Water can boil itself c. water develops heat on its own D. None of the above | 11 |

1499 | To measure the specific heat of copper, an experiment is performed in the lab. ( A ) piece of copper is heated in an oven then dropped into a beaker of water. To calculate the specific heat of copper, the experimenter must know or measure the value of all of the quantities below EXCEPT the A. Original temperatures of the copper and the water B. Mass of the water C. Final (equilibrium) temperature of the copper and the water D. Time taken to achieve equilibrium after the copper is dropped into the water E. Specific heat of the water | 11 |

1500 | lce at ( 0^{circ} C ) is added to ( 500 g ) of water at ( 100^{circ} mathrm{C} ) degree. Ice is continually added to the system until it has all melted and no more ice will melt. What will be the temperature of the water in the system? A . 50 B . 25 c. 4.184 D. E . | 11 |

1501 | If the pressure of a gas is doubled then its thermal conductivity will : A. remain constant B. decrease c. decrease exponentially D. increase | 11 |

1502 | Two non-reactive monoatomic ideal gases have their atomic masses in the ratio 2:3. The ratio of their partial pressures, when enclosed in a vessel kept at a constant temperature, is 4: 3 The ratio of their densities is ( A cdot 1: 4 ) B. 1: 2 ( c cdot 6: 9 ) D. 8: 9 | 11 |

1503 | Heat is transmitted from higher to lower temperature through actual motion of the molecule in A. conduction B. convection c. radiation D. all of these | 11 |

1504 | Fill in the empty values of the cells in the table: ( begin{array}{cccc} & boldsymbol{V}_{1} & boldsymbol{T}_{1} & boldsymbol{V}_{2} & boldsymbol{T}_{2} \ mathrm{A} & & 840 & 1070 & 147 \ mathrm{B} & begin{array}{l}3250 \ mathrm{ml}end{array} & mathrm{K} & mathrm{m} 1 & mathrm{K} \ mathrm{C} & 10 mathrm{Litre} & & 15 text { Litre } & 50^{0}end{array} ) Use Charles Law to fill the following table: | 11 |

1505 | The melting point of pure ice is ( 0^{circ} C ) A . True B. False | 11 |

1506 | The molar specific heat of oxygen at constant pressure ( boldsymbol{C}_{boldsymbol{P}}= ) ( mathbf{7 . 0 3} mathbf{c a l} / mathbf{m o l}^{circ} mathbf{C} ) and ( boldsymbol{R}= ) ( 8.32 J / ) mol ( ^{circ} mathrm{C} ). The amount of heat taken by 5 moles of oxygen when heated at constant volume from ( 10^{circ} mathrm{C} ) to ( 20^{circ} mathrm{C} ) will be approximately. ( mathbf{A} cdot 25 ) cal в. 50 cal c. 253 call ( l ) D. 500 call | 11 |

1507 | The water is used as a coolant in motor car engines because it has a very specific latent heat of fusion. A . Low B. Highh c. Normal D. Can’t say | 11 |

1508 | A alatnermıc piscon alvıaes aalapatıc cylinder of volume ( V_{0} ) into two equal parts as shown in the figure.Both the parts contain ideal monoatomic gases. The initial pressure and temperature of gas in left compartment are ( P_{0} ) and ( T_{0} ) while that in right compartment are ( 2 P_{0} ) and ( 2 T_{0} . ) Initially the piston is kept fixed and the system is allowed to acquire a state of thermal equilibrium. The pressure in left compartment after thermal equilibrium is achieved is: ( A cdot P_{o} ) B. ( frac{3}{2} P ) ( c cdot frac{4}{3} P ) D. None | 11 |

1509 | State two differences between “Heat Capacity” and “Specific Heat Capacity” | 11 |

1510 | The thermal conductivity of a rod depends on: A. length B. mass c. area of cross-section D. material of rod | 11 |

1511 | The volume of a gas is 5 litres at ( mathrm{N} ). T.P. what will be its volume at ( 273^{0} mathrm{C} ) and at a pressure of four atmospheres A. 5 litres B. 2 litres c. 4 litres D. 2.5 litres | 11 |

1512 | A vessel has ( 6 g ) of hydrogen at pressure ( P ) and temperature ( 500 K . A ) small hole is made in it so that hydrogen leaks out. How much hydrogen leaks out if the final pressure is ( boldsymbol{P} / 2 ) and temperature falls to ( 300 mathrm{K} ? ) ( A cdot 28 ) B. 3g ( c cdot 4 g ) D. 18 | 11 |

1513 | Find out the increase in temperature of ( 50 g ) block of solid marble (specific heat ( =mathbf{0 . 9 k J} / k g), ) originally at 20 if it absorbs ( 100 mathrm{J} ) of heat ( ? ) ( mathbf{A} cdot mathbf{1} ) B. 2 ( c cdot 4 ) D. 10 E. 20 | 11 |

1514 | Assertion Latent heat of fusion of ice is ( 33600 J k g^{-1} ) Reason Latent heat refers to change of state without any change in temperature. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 11 |

1515 | A gas behaves more closely like an ideal gas at A. low pressure and low temperature B. low pressure and high temperature c. at all pressure and temperature D. none of these | 11 |

1516 | State whether given statement is True or False Radiant heat can easily pass through air | 11 |

1517 | Kelvin is the standard temperature scale. | 11 |

1518 | If the temperature of the sun is doubled then the maximum emission wavelength as compared to its initial value will be A. ( 1 / 4 ) times B. ( 1 / 2 ) times c. double D. 4 times | 11 |

1519 | Which one of the following is not a chemical change? A. Sublimation B. Combustion c. Electrolysis D. Rusting | 11 |

1520 | lodine-salt mixture can be separated through: A. simple distillation B. simple filtration c. sublimation D. fractional distillation | 11 |

1521 | A gas is enclosed in a vessel of volume ( V ) at a pressure ( P . ) It is being pumped out of the vessel by means of a piston pump with a stroke volume ( frac{V}{100} . ) What is the final pressure in the vessel after ( n ) strokes of the pump? Assume no change in temperature during pumping out of gas. | 11 |

1522 | The freezing point of water in Kelvin scale is: A . ( 73.15 K ) В. ( 173.15 K ) c. ( 273.15 K ) D. ( 373.15 K ) | 11 |

1523 | When the specific heat of a solid is measured by the method of mixture, the heat is lost to surroundings from the calorimeter by the process of A. radiation B. conduction c. convection D. both conduction and convection | 11 |

1524 | When the bulb of a constant volume hydrogen thermometer is placed in melting ice, the pressure recorded is ( 80 mathrm{cm} mathrm{Hg} ) and when immersed is boiling water, it is ( 113 mathrm{cm} ) Hg. When the bulb is placed in another boiling liquid, the pressure recorded is ( 143 mathrm{cm} ) Hg.What is the boiling point of the liquid? | 11 |

1525 | Two spheres of same size are made of the same metal but one is hollow and the other is solid. They are heated to same temperature, then A. both spheres will expand equally B. hollow sphere will expand more than the solid one c. solid sphere will expand more than the hallow one D. none of these | 11 |

1526 | Two marks on a glass rod ( 10 mathrm{cm} ) apart are found to increase their distance by ( 0.08 mathrm{mm} ) when the rod is heated from ( 0^{circ} ) ( mathrm{C} ) to ( 100^{circ} mathrm{C} ). A flask made of the same glass as that of rod measures a volume of ( 1000 mathrm{cc} ) at ( 0^{circ} mathrm{C} ). The volume it measures at ( 100^{circ} mathrm{C} ) in cc is A . 1002.4 B. 1004.2 c. 1006.4 D. 1008.2 | 11 |

1527 | A metallic sphere cools from ( 50^{circ} mathrm{C} ) to ( 40^{circ} mathrm{C} ) in 300 seconds. If the room temperature is ( 20^{circ} mathrm{C} ) then its temperature in the next 5 minutes will be: A ( cdot 30^{circ} mathrm{C} ) B. ( 33.3^{circ} mathrm{C} ) ( mathbf{c} cdot 36^{circ} C ) D. ( 38^{circ} mathrm{C} ) | 11 |

1528 | An ideal gas with adiabatic exponent ( =1.5 ) ) undergoes a process in which work done by the gas is same as increase in internal energy of the gas. The molar heat capacity of gas for the process is: ( A cdot C=4 R ) B. ( c=0 ) ( c cdot c=2 R ) D. ( c=R ) | 11 |

1529 | A bar of iron is ( 10 mathrm{cm} ) at ( 20^{circ} mathrm{C} ). At ( 19^{circ} mathrm{C} ) it will be ( left(alpha_{F e}=11 times 10^{-6} /^{o} Cright) ) A. ( 11 x 10^{-6} mathrm{cm} ) longer B. ( 11 x 10^{-6} ) cm shorter ( mathrm{c} cdot 11 x 10^{-5} mathrm{cm} ) shorter D. ( 11 x 10^{-5} mathrm{cm} ) longer | 11 |

1530 | A body cools from a temperature ( 3 T ) to ( 2 T ) in 10 minutes. The room temperature is ( T . ) Assume that Newton’s law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be A ( cdot frac{7}{4} T ) в. ( frac{3}{2} T ) c. ( frac{4}{3} T ) D. ( T ) | 11 |

1531 | Convection currents are possible in solids A . True B. False | 11 |

1532 | Hot milk is easier to drink from a bowl than from a glass. Mention the reason. | 11 |

1533 | A ( 2 mathrm{KW} ) heater of capacity 10 litres is used for heating water. The time required to raise the temperature of water by ( 10 mathrm{K} ) is ( A cdot 210 S ) B. 180 s c. 240 s D. 150 | 11 |

1534 | Three rods made of the same material and having the same cross-section have been joined as shown in figure. Each rod is of the same length. The left and right ends are kept at ( 0^{circ} mathrm{C} ) and ( 90^{circ} mathrm{C} ) respectively. The temperature of the junction of three A ( cdot 46^{circ} mathrm{C} ) B. ( 60^{circ} mathrm{C} ) ( c cdot 30^{circ} mathrm{C} ) D. ( 20^{circ} ) C | 11 |

1535 | Steam at ( 100^{0} C ) causes ……… severe burns than water at ( 100^{0} C ) A . less B. more c. same D. cant say | 11 |

1536 | Assertion A sphere, a cube and thin circular plate of the same mass are made of the same material. If all of them are heated to the same high temperature the rate of cooling is maximum for the plate and minimum for the sphere. Reason The rate of loss of heat by radiation is proportional to the surface area. A. Assertion is False and Reason is True B. Reason is False and assertion is True c. Both Assertion and Reason are True and reason correctly explains assertion D. Both Assertion and Reason are True but assertion does not correctly explain reason | 11 |

1537 | Identity the correct statements from the following: This question has multiple correct options A. When hot water is poured into a thickly walled glass tumbler suddenly it develops cracks because of unequal expansions of the surfaces. B. For the use of hot liquids, thin-walled glass containers are preferred C. A steel disc is fixed tightly in a hole in a brass plate. The disc can be separated by cooling. D. Bimetallic strip works on the principle of unequal expansions. | 11 |

1538 | One mole of an ideal gas in initial state A undergoes a cyclic process ( A B C A, ) as shown in the figure. Its pressure at ( A ) is ( P_{0} . ) Choose the correct option(s) from the following. This question has multiple correct options A. Internal energies at A and B are the same B. Work done by the gas in process AB is ( P_{o} V_{o} ) In 4 c. pressure at ( c ) is ( frac{P_{o}}{4} ) D temperature at ( C ) is ( frac{T_{o}}{4} ) | 11 |

1539 | In the given (V-T) diagram, what is the relation between pressures ( P_{1} ) and ( P_{2} ? ) A ( cdot P_{2}=P_{1} ) в. ( P_{2}>P ) ( c cdot P_{2}<P ) D. cannot be predicted | 11 |

1540 | The deviation of gases from the behaviour of ideal gas is due to A. colourless molecules B. covalent bonding of molecules c. attraction of molecules D. absolute scale of temperature | 11 |

1541 | Good conductor of heat is A. Hydrogen B. Oxygen C. Nitrogen D. None | 11 |

1542 | Match Coumn I with Column II | 11 |

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