# Force And Pressure Questions

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

#### List of force and pressure Questions

Question NoQuestionsClass
1Which of the following is a unit of atmospheric pressure.
A. torr
B. bar
c. ( a t m )
D. all of the above
8
2Assertion
The force exerted by the fluid is due to
the collisions of molecules with their
surroundings.
Reason
The normal force exerted by the fluid
particles on the walls of the container
results pressure.
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 incorrect but Reason is correct
D. Both Assertion and Reason are incorrect
8
3Which one of the following forces is a
contact force?
A. Force of gravity
B. Force of friction
c. Magnetic force
D. Electrostatic force
8
4The force between two charge bodies is
called
A. muscular force
B. gravitational force
c. magnetic force
D. electrostatic force
8
5The foundations of high-rise buildings are kept wide so that they may exert more pressure on the ground.
A. True
B. False
8
6A right angled tube is fixed horizontally on a horizontal surface and an ideal
liquid of density p is flowing into the
tube at the rate of ( Q=4 m^{3} / s ) Cross
sectional area of the tube at intake and
outlet positions are ( A=2 m^{2} ) and ( S= )
( 1 m^{2} ) respectively. The magnitude of net
force exerted by liquid on the tube is (Given that the value of atmospheric
pressure ( left.P_{o}=4 p N / m^{2}right) )
( mathbf{A} cdot 3 sqrt{12} p )
B. ( 4 sqrt{41} p )
c. ( 5 sqrt{21} p )
D. None of there
8
7A cylindrical diving bell, whose length is ( 150 mathrm{cm} ) is lowered to the bottom of tank.
The is found to raise ( 50 mathrm{cm}, ) into
bell.Assuming the atmospheric pressure at the sunrise equivalent to
1000 ( c m ) of the water and the
temperature as constant the depth of the tank
8
8( 1 mathrm{mm} mathrm{Hg} ) is equal to
( A cdot 1 ) atm
B . ( 1.013 times 10^{5} ) Pa
c. 133.29 atm
D. ( 1.316 times 10^{-3} ) atm
8
9Force is a scalar quantity. Is statement
true or false
A . True
B. False
8
10The magnitude of non-contact force depends upon:
A. Distance between two bodies
B. Mass of the two bodies
c. chemical properties of the two bodies
D. All of the above
8
11Which of the following statement is NOT
true
This question has multiple correct options
A. A freely falling body is acted upon by gravitational force
B. pressure on top of mount everest is much more than 1 ( operatorname{atm} )
C. S.I. unit of pressure is pascal
D. the blood vessels in our body maintains the internal pressure equal to the atmospheric pressure
8
12There are circumstances in which two
objects exert forces on one another even though they are not touching. Such forces are called (Mark the most
A. non-contact forces
B. contact forces
c. electric forces
D. attractive forces
8
13State True or False :
Gravity of Earth, attracts all objects
towards the centre of Earth.
A. True
B. False
8
14Contact forces
A. Are action at a distance forces
B. Ex-gravitational forces
C. Act when the bodies are in physical contact with other
D. All
8
15An intense stream of water of cross
section area A strikes a wall at an angle ( theta ) with the normal to the wall and
returns back elastically. If the density of
water is ( rho ) and its velocity is ( v ), then the force exerted on the wall will be :
A ( cdot 2 A v^{2} )
Ð’. ( 2 A v^{2} rho )
c. ( 2 A v^{2} rho cos theta )
D ( cdot 2 A v^{2} rho sin theta )
8
16Why do mountaineers usually suffer from nose-bleeding at high altitudes?8
17A tall vertical cylinder filled with water is kept on a horizontal table top. Two small holes ( A ) and ( B ) are made on the
wall of the cylinder, A near the middle and B just below the free surface of
water
A. Water jet through A will have larger range
B. Water jet through B will have larger range
c. water jets through ( A ) and ( B ) will have equal range
D. There will be no water jet through B
8
18Gravitational force is a/an
force
A. repulsive
B. attractive
c. contact
D. neutral
8
19Assertion
The force exerted by the fluid is due to
the collisions of molecules with their
surroundings.
Reason
The normal force exerted by the fluid
particles on the walls of the container
results pressure.
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
8
20An athlete runs for a certain distance
before taking long jump, Why?
8
21Reindeers are made to pull the sledges in artic regions.The force involved in this activity is
A. Frictional force
B. Gravitational force
c. Magnetic force
D. Muscular force
8
22Muscular force can
A. change the state of motion of an object
B. change the shape of an object
C. both A and B
D. neither A nor B
8
23Water flows out of a pipe and hits a wall. When the jet of water hits the wall, it has horizontal velocity v and crosssectional area A. The density of the water is ( rho . ) The water does not rebound
from the wall. What is the force exerted
on the ball by the water?
A. ( frac{rho v}{A} )
Ð². ( frac{p v^{2}}{A} )
( c cdot rho A v )
D ( cdot rho A v^{2} )
8
24We sit in the room with windows open.
Then
A. Air pressure on the floor of the room equals the atmospheric pressure but the air pressure on the ceiling is eligible
B. Air pressure is nearly the same on the floor, the walls and ceiling
C. Air pressure on the floor equals the weight of the air coloumn inside the room (from floor to the ceiling) per unit area
D. Air pressure on the walls is zero since the weight of air acts downward
8
25A cylinder contains ( 10 mathrm{kg} ) of ( operatorname{gas} ) at ( mathrm{a} ) pressure of ( 10^{7} mathrm{N} boldsymbol{m}^{-2} . ) The quantity of
gas taken out of the cylinder, if final pressure is ( 2.5 times 10^{6} mathrm{N} m^{-2} ) is?
A. ( 9.5 mathrm{kg} )
B. ( 7.5 mathrm{kg} )
c. ( 14.2 mathrm{kg} )
D. zero
8
26A gas is filled in a container at pressure
( P_{0} . ) If the mass of molecules is halved
and their rms speed is doubled, then the resultant pressure would be.
( mathbf{A} cdot 2 P_{0} )
Ð². ( 4 P_{0} )
c. ( frac{P_{0}}{4} )
D. ( frac{P_{0}}{2} )
8
27In crushing can experiment, the
vaccum inside the can causes
pressure
A. Increase
B. Decrease
c. No change
D. All
8
28An instrument commonly used for measurement of atmospheric pressure
is known as
A. Manometer
B. Barometer
c. Calorimeter
D. Potentiometer
8
29Working of a pump is based on the
A. force of friction
B. atmospheric pressure
c. gravitational force
D. volume of fluid extracted
8
30Assertion
A body having the uniform density has
same point, as centre of gravity and
centre of buoyancy
Reason
While formulating the equation for positioning centre of mass and centre of buoyancy,has difference of the term
of uniform density only.
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
8
31toppr OGII
opened, the piston moves slightly to the right, towards the tap.
What can be deducted about the
pressure of gas ( X ? )
before opening after opening tap ( operatorname{tap} )
ess than pre than atmospheric ( quad ) atmospheric pressure
( operatorname{mec} )
more than atmospheric ( quad ) atmospheric pressure ( quad ) pressure
ore than less than atmospheric ( quad ) atmospheric pressure
more than ( quad ) same as atmospheric ( quad ) atmospheric pressure ressurr
atmosphere
( A cdot A )
B.
( c . )
( D )
8
32The air pressure inside out body is equal to the ( _{–}-_{-} ? )
A. in internal pressure
B. atmospheric pressure
c. both a and ( b )
D. none of the above
8
33Like poles of two magnets each
other.
A . attract
B. repel
c. exert no force on
D. neutralize
8
34Which of the following is a non contact force?
A. muscular
B. electrostatic attraction
c. elastic spring force
D. friction force
8
35The tremendous pressure exerted by air can be demonstrated by :
A. crushing can experiment
B. Hydraulic press
c. Altimeter
D. All
8
36State whether given statement is True or False
You find your mass to be ( 42 mathrm{kg} ) on a weighing machine. Is your mass more
or less than ( 42 mathrm{kg} ? )
A. True
B. False
8
37Gravitational force acts
A. only between the sun and the planets moving around it.
B. only between the earth and the bodies on it.
C. between all bodies in the universe.
D. only between the Sun and the earth.
8
38In bullocks,horses,camels pulling carts the effort(force)is caused by
A. The woody carts
B. The muscles of animals
c. Muscles of humans
D. The frictional force between the roads and wheels of the carts
8
39Unlike poles of two magnets
each other.
A . attract
B. repel
c. neutralize
D. exert no force on
8
40Air is pumped into an automobile Tyre’s tube up to a pressure of 200 kPa in the morning when the air temperature is
( 20^{circ} . ) During the day the temperature
rises to ( 40^{circ} ) and the tube expands by ( 2 % )
Calculate the pressure of the air in the tube at this temperature
8
41By his famous experiment, Otto von Guericke demonstrated the presence of
A. atmospheric pressure
B. force
c. magnetic force
D. friction
8
42The force exerted by a charged body on another charged or uncharged body is known as force.
A. magnetic
B. electrostatic
c. gravitational
D. friction
8
43Which of the following is a non-contact force?
A. Gravitational force
B. Magnetic forces
c. Electric force
D. All
8
44The pressure exerted by solids is a little different from that of fluids as in the
case of solids, due to
A. Tight interactions of atoms/ molecules
B. Loose interactions of atoms/ molecules
c. Medium interactions of atoms/ molecules
D. This statement is incorrect
8
45The external pressure exerted on the fluid is transmitted uniformly. Is the statement True or false
A. True
B. False
8
46A ( 100 N ) force makes an angle of ( theta ) with
the ( x ) -axis and has a y-component of
( 30 N . ) Then the ( x ) -component of the force
is:-
Ð’. ( 95.39 N )
c. ( 104.4 N )
D. ( 0 N )
8
47When the piston of a pump is pulled up, the pressure inside
A. decreases
B. increases
c. remains same
D. none of the above
8
48horizontal force,8
49Fruits detached from a tree fall down
due to force of gravity. We know that a force arises due to interaction between
two objects. Name the objects interacting in this case.
A. Earth and tree
B. Earth and fruit
c. Earth and branch
D. None of the above
8
50Which of the following force doesn’t change with distance?
A. Electrostatic force
B. Gravitational force
c. Frictional force
D. Magnetic force
8
51Which of the following is NOT a noncontact force?
A. Magnetic force
B. Electrostatic force
c. Gravitational force
D. Muscular force
8
52State whether the following statements
are true or false?
(i) the pressure inside our body is equal to the atmospheric pressure
(ii) pressure is inversely proportional to the area.
A. Both are true
B. Both are false
c. (i) True
(ii) False
D. (i) False
(ii) True
8
53You are riding on your bicycle with
inflated tyres. Your friend asks for a lift and sits on the carrier behind you
A. The air pressure in the tyres increases
B. The air pressure in the tyres decreases
C. The air pressure in the tyres remains the same
D. Nothing inthe system changes except the reaction of the ground
8
54Which of these is not a contact force?
A. Friction
B. Muscular force
c. Magnetic force
D. None of these
8
55Atmospheric pressure is ( N m^{-2} ) at sea level.
A ( cdot 2.026 times 10^{5} )
Ð’. ( 1.013 times 10^{5} )
c. ( 3.039 times 10^{5} )
D. ( 1.013 times 10^{6} )
8
56Attraction or repulsion between two objects can also be seen us another
form of
A. pull or push
B. pull only
c. push only
D. none of the above
8
57Barometer was constructed by
A. Torricelli
B. Newton
c. Archimedes
D. None
8
58Fill in the blank.
At least ( _{-}-_{-}-_{-}-_{-}-_{-} ) objects must
interact for a force to come into play.
( A )
B. 2
( c cdot 3 )
D. 4
8
59While sieving grains, small pieces fall down. Which force pulls them down?
A. Coulomb force
B. Gravitational force
c. Nuclear force
D. Electrostatic force
8
60the density of the atmosphere at sea
level is ( 1.29 mathrm{kg} / mathrm{m}^{2} ). Assume that it does not change with altitude. The how high would the atmosphere extend?
8
61Why does a straw get attracted towards another straw which is rubbed with a
sheet of paper?
A. Due to friction force
B. Due to electrostatic force
c. Due to magnetic force
D. Due to gravitational force
8
62Fill in the blank.
Dams are ( _{—} ) at the base.
A. thicker
B. thinner
c. same
D. can’t say
8
63Sideways pressure exerted by a liquid is called its lateral pressure.
True ( =1 ; ) False ( =0 )
8
64Electrostatic force is also a force
A. contact
B. muscular
c. non-contact
D. gravitational
8
65Fill in the blanks:
Animals make use of
carry out their physical activities and other tasks.
A. contact force
B. non-contact force
c. force of friction
D. muscular force
8
66During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is
A. force of gravity.
B. electrostatic force
c. force of friction.
D. magnetic force.
8
67The force applied by the archer to stretch the bow is an example of (contact, non-contact) force.8
68Unit for pressure used in weather maps is millibar. 1 millibar is equal to
A. 1000 bar
B. 100kPa
c. ( 100 mathrm{Pa} )
D. tatm
8
69Pressure on the walls by any fluid is due
to
A. inelastic collisions of the molecules on the walls.
B. elastic collisions of the molecules on the walls.
c. electrostatic attraction of molecules with the
molecules of the wall.
D. electrostatic repulsion of molecules with the molecules of the wall.
8
70Pressure exerted by liquid depends on
A. Depth of liquid
B. Gravity
c. Density of liquid
D. All of these
8
711atm ( = )
A. ( 100 mathrm{cm} ) of ( mathrm{Hg} )
B. ( 76 mathrm{cm} ) of ( mathrm{Hg} )
c. ( 20 mathrm{cm} ) of ( mathrm{Hg} )
D. ( 25 mathrm{cm} ) of ( mathrm{Hg} )
8
72(i) The cubical container ABCDEFGH
which is completely filled with an idea (nonviscous and incompressible) fluid,
moves in a gravity free space with a acceleration of ( boldsymbol{a}=boldsymbol{a}_{0}(hat{boldsymbol{i}}-hat{boldsymbol{j}}+hat{boldsymbol{k}}) )
where ( a_{0} ) is a positive constant. Then
the only point in the container shown in
the figure where pressure is maximum,
is
( A cdot B )
B.
( c . E )
( D )
8
73Assertion
Pressure applied to an enclosed fluid is transmitted undiminished to every
portion of the fluid and the walls of the
containing vessel.
Reason
Fluids cannot distribute the external
pressure equally to all portions.
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
8
74Atmospheric pressure at sea level is
A . ( 1.013103 mathrm{Pa} )
B. 1.013 104 Pa
c. 1.013 105 ( mathrm{Pa} )
D. 1.013 106 Ð Ð°
8
75How high does a mercury barometer
stand on a day when atmospheric pressure is ( 98.6 k P a )
8
76Which of the following are the common consequences of atmospheric pressure in our daily life.
A. Sucking a drink with a straw
B. Filling a syringe with a liquid
c. Filling ink in a fountain pen
D. All of the above
8
77Force that enable us to perform all activities like movement or bending of the body is
A . Gravitational force
B. Frictional force
c. Muscular force
D. Magnetic force
8
78When a ball is hit by a bat, forces acting on the ball are
A. muscular force
B. gravitational force
c. both A and B
D. neither A nor B
8
79When a body rests on a surface, then which force is applied on the surface by the body? (Gravitational, Upthrust)8
80Types of forces a fluid exerts are
and
8
81During winter, clothes tend to stick to our body as an action of force.
A. electrostatic
B. muscular
c. magnetic
D. contact
8
82Find the total force exerted by liquid ( boldsymbol{A} )
on the cylinder
8
83List out the following actions on the basis of contact force and non contact
force.
a) Lifting a chair
b) The falling of a coconut from the tree
c) Friction between the road and the
tyre of a car
d) A comb attracts bits of paper
e) Attraction between two magnets
8
84The cubical container ABCDEFGH which
is completely filled with an ideal (nonviscous and incompressible) fluid,
moves in a gravity free space with a acceleration of ( boldsymbol{a}=boldsymbol{a}_{0}(hat{boldsymbol{i}}-hat{boldsymbol{j}}+hat{boldsymbol{k}}) )
where ( a_{0} ) is a positive constant. Then,
the pressure will be minimum at point:
( A )
B.
( c )
2
8
85Which of the following is NOT a type of force?
A. muscular
B. magnetic
c. chemical
D. pulling a bucket of water from a well
8
86Under action of which force does water
flow from an open tap towards ground?
A. Electrostatic force
B. Magnetic force
c. Gravitational force
D. None of the above
8
87What type of force is exerted on our body during respiration?
A. Magnetic force
B. Non-contact force
c. Muscular force
D. Gravitational force
8
88Which of the following are the examples of atmospheric pressure?
A. Fountain bottle
B. Ping pong funnel
c. Million dollar bet
D. All of the above
8
892
6
3
8
90The boiling point of a liquid can be raised by
A. Increasing pressure
B. Decreasing pressure
c. Increasing the heat supply
D. Increasing the quantity of the liquid
8
91The ordinary pressure of air surrounding us is
A. 15 pounds
B. 16 pounds
c. 14.2 pounds
D. 14.7 pounds
8
92Pressure exerted by static fluid does not depends on
A. Shape of the liquid
B. Total mass of liquid
c. Surface area of liquid
D. All of these
8
93How can you demonstrate the process of atmospheric pressure experimentally?8
94In a dam,where water has a height of ( h )
then centre of pressure is
A . below the height of ( frac{h}{2} )
B. above the height of ( frac{h}{2} )
c. at the height of ( frac{h}{2} )
D. any of the above
8
95wherever the air pressure is higher,
there will be a stronger force or push against an object. Is the statement True or False
A. True
B. False
8
96The pressure exerted by a column of liquid of height ( h ) and density ( p ) is
given by the hydrostatic pressure equation equal to
( A cdot p g h )
B. ( p g )
( c cdot g h )
D. Cannot be calculated
8
97A large cylindrical vessel contains water to a height of ( 10 m ). It is found that
the thrust acting on the curved surface is equal to that at the bottom. if
atmospheric pressure can support a water column of ( 10 m, ) the radius of the
vessel is :
A . ( 10 m )
B. ( 15 mathrm{m} )
( c .5 m )
D. 25
8
98State whether true or false:
A sheet of paper falls slower than one that is crumpled into a ball.
A. True
B. False
8
99Assertion
Liquid exerts pressure on walls of
container
Reason
Molecules of liquid collides
continuously with wall
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
8
100The magnitude of average atmospheric pressure on the surface of the earth is:
A. 1 bar
B. 10 bar
c. 100 bar
D. 0.1 bar
8
101During dry weather, clothes made of synthetic fibre often stick to the skin. Which type of force is responsible for this phenomenon?
A. Electrostatic force
B. Frictional force
c. Inter Molecular force
D. None of the above
8
102Objects fall towards the earth because the earth pulls those. This pull is called force.
A. contact
B. muscular
c. gravitational
D. electrostatic
8
103What type of force is applied in kicking a football?
A. Magnetic force
B. Muscular force
c. Electrical force
D. Nuclear force
8
104A contact force cannot act through
A. Empty space
B. Touching
C. Touching with a metal rod
D. Touching with a wooden rod
8
105The thigh bones(femurs),each of cross-
sectional area ( 10 mathrm{cm}^{2} ) support the
upper part of the human body of mass 40 kg.Average pressure sustained by the femurs is:
( mathbf{A} cdot 10^{3} N / m^{2} )
B . ( 2 times 10^{5} mathrm{Nm}^{-2} )
c. ( 6 times 10^{-5} mathrm{Nm}^{-2} )
D. ( 10^{-3} mathrm{Nm}^{-2} )
8
106Liquids exerts force on wall of container because they don’t have any preffered direction.
Mark 1 if true else mark 0
8
107Height of atmosphere is about ( boldsymbol{k m} )
A. 3000
Ð². 300
c. 30
D. 30000
8
108Assertion
In liquid retaining structures with fixed or floating covers the gas pressurevdeveloped above liquid surface shall be added to the liquid
pressure
Reason
In plane walls, the liquid pressure is resisted by both vertical and horizontal bending moments.
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
8
109A glass bulb is balanced by a brass weight in a sensitive beam balance. Now the balance is covered by a glassjar which is then evacuated. Then:
A. the beam will remain horizontal
B. the pan containing the bulb will go down
c. the pan containing the bulb will go
D. none of the above
8
110When the ink fountain pen leaks on
high altitude:
A. pressure of air is more outside than inside the ink pen
B. pressure of air is less outside than inside the pen
C. the density of ink on high altitude decreases
D. none of these
8
111Which of the following is not an example of muscular force?
A. An animal pulling a cart.
B. A man pushing a stationary car.
c. An apple falling from a tree.
D. Two girls pushing each other.
8
112Fill in the blanks:
The force resulting due to the action of muscles is known as the
force.
A. contact
B. muscular
c. friction
D. magnetic
8
113We do not feel the pressure of the atmosphere around us, because the pressure in our bodies is roughly the same as the atmospheric pressure outside. Therefore, both the forces
acting on our bodies cancel out and we
do not feel uncomfortable. Type 1 for true and 0 for false
8
114When pressure exerted on fluids by container, then the force is always parallel to the wall. Is the statement true or False
A. True
B. False
8
115State whether true or false:
A boy throws a ball down from the second floor of a building. In this case, electrostatic force is acting on the ball.
A. True
B. False
8
116Describe an experiment to demonstrate
that air exerts pressure.
8
117Pressure (P) exented by liquid on walls of the container when ( h= ) height of the liquid column, ( f= ) density, ( g ) is acceleration due to gravity
A. ( p=h f g )
Ð². ( p=frac{d f}{g} )
c. ( _{p}=frac{h g}{f} )
D. ( p=frac{d f}{h} )
8
118Fill in the blanks in the following
statements:
(a) To draw water from a well we have to
at the rope
(b) A charged body an
uncharged body towards it.
(c) To move a loaded trolley we have to
Â¡t.
(d) The north pole of a magnet
the north pole of
another magnet.
8
119A barometer tube, containing mercury, is lowered in a vessel containing mercury until only ( 50 mathrm{cm} ) of the tube is
above the level of mercury in the vessel.
If the atmospheric pressure is ( 75 mathrm{cm} ) of
mercury, what is the pressure at the top of the tube
A. ( 33.3 k P a )
Ð². ( 66.7 k P a )
c . 3.33 M ( P a )
D. ( 6.67 M P a )
8
120When we suck using a straw, the liquid travels up into it. Explain why?8
121Which of the following is an example of contact force?
This question has multiple correct options
A . Muscular force
B. Magnetic force
c. Gravitational force
D. Frictional force
8
122How many significant characteristics are defined for the pressure exerted on fluids by container?
( A cdot 4 )
B. 5
( c cdot 3 )
D.
8
123invented a pump to extract air out of the vessel.
A. otto von Guericke
B. Newton
c. Albert Einstein
D. Gallileo
8
124Fountain pen leak at high altitude.Type 1
for true and 0 for false
8
125In a weather map, lines joining all those regions with same atmospheric
pressure are called
A. Bars
B. Millibars
c. Isobars
D. None
8
126A constant force ( boldsymbol{F} ) is applied in
horizontal direction as shown. Contact
force between ( M ) and ( m ) is ( N ) and
between ( m ) and ( M^{prime} ) is ( N^{prime} ) then:
A ( . N=N^{prime} )
B. ( N>N^{prime} )
C ( . N^{prime}>N )
D. Cannot be determined
8
127Atmospheric CO2 concentrations have
increased from 280 ppmvin preindustrial times to 365 ppmv today. What is the corresponding increase in the mass of atmospheric carbon? Assume CO2 to be well mixed in the
atmosphere.
8
128What will be the pressure in dyne ( mathrm{cm}^{-2} ) due to a water column of height
( 12.5 c m ?left(g=980 c m s^{-2}right) ) (density of
water ( 10^{3} k g m^{-3} ) ).
8
129The gravitational force is a force
A. non-contact force
B. contact
c. frictional
D. destructive
8

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