Environmental Issues Questions

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

Environmental Issues Questions

List of environmental issues Questions

Question NoQuestionsClass
1Increase in concentration of a toxicant
at successive trophic levels is called
A. Algal bloom
B. Biomagnification
c. Eutrophication
D. Accelerated eutrophication
E. Decelerated eutrophication
12
223. Which of the following chemical, harmful to ozone, is
released by chlorofluorocarbon?
(a) Sulphur dioxide (b) Chlorine
(c) Fluorine
(d) Nitrogen dioxide
12
3Water (Prevention and Control of
Pollution) Act was enacted during
A . 1952
в. 1972
( c .1974 )
D. 1969
12
4What are the different ways in which
water gets contaminated?
12
5Sewage water is purified for recycling by the action of:
A . fish
B. micro-organisms
c. fuels
D. non-biodegradable chemicals
12
6Ozone in the stratosphere is depleted by
A ( cdot C_{6} F_{6} C l_{6} )
в. ( C_{7} F_{16} )
c. ( C F_{2} C l_{2} )
D. ( C_{6} F_{6} )
12
748. Ozone Day is celebrated on :
(1) 25th September
(2) 5th June
(3) 21st April
(4) 16th September
12
8A lake receiving nutrients would be
A. oligotrophic
B. Eutrophic
( c . operatorname{sink} )
D. Rich in fossils
12
9A scrubber in the exhaust of a chemical industry removes
A. Hydrogen sulphide
B. Sulpher dioxide
c. Nitrous oxide
D. Carbon monoxide
12
1081. Spraying of DDT produces pollution of the type:
(a) air
(b) air and water
(c) air and soil (d) air, water and soil
12
11BOD of two samples of water A and B were ( 120 mathrm{mg} / mathrm{l} ) and ( 400 mathrm{mg} / mathrm{l} )
respectively. Which sample is more polluted.
12
12Which of the following are caused due to the unplanned clearing of land?
(i) The destruction of habitats
(ii) Soil erosion
(iii) Land slides
(iv) Global warming
A. only (i), (ii) and (iii)
B. Only (i), (ii) and (iv)
C. Only (i), (iii) and (iv)
D. (i), (ii), (iii) and (iv)
12
13Fish die in water bodies polluted by
sewage due to
A. Pathogens
B. clogging of gills by silt
c. Reduction in oxygen
D. Foul smell
12
14Which of the following is found in human faces, animal waste, oil, urea, pesticides, herbicides, fruits and vegetable waste, etc?
A. Inorganic impurities
B. organic impurities
C. Nutrients
D. Bacteria
12
15Biochemical oxygen demand in a river
water
A. Remains unchanged when algal bloom occurs
B. Increases when sewage gets mixed up with river water
C. Has no relationship with concentration of oxygen in water
D. Gives a measure of Salmonella in water
12
1616. Ultraviolet radiation from sun causes a reaction that
produces:
(a) fluorides
(b) carbon monoxide
(C) sulphur dioxide (d) ozone
12
17In which of the following year, the depletion of the ozone layer have been
noticed?
A . 1979
в. 1980
( c . ) 1981
D. 1982
12
18Removal of soil by the action of wind and water is known as
A. Soil erosion
B. Soil conservation
c. Salination
D. Calcification
12
1929. Ozone hole refers to
(a) Increase in concentration of ozone
(b) Hole in ozone layer
(C) Reduction in thickness of ozone layer in stratosphere
(d) Reduction in thickness of ozone layer in troposphere
12
20Removal of top fertile layer of soil by wind or water is called as
A. Leaching
B. Erosion
c. Siltation
D. Weathering
12
21DDT residues are rapidly passed through food chain causing biomagnification because DDT is
A. water soluble
B. Lipid soluble
c. Moderately toxic
D. Non-toxic to aquatic animals
12
22In a lake an inflow domestic sewage
rich in organic waste may result in
A. Drying of the lake very soon due to algal bloom.
B. An increased production of fish due to lot of nutrients
c. Death of fish due to lack of oxygen
D. Increased population of aquatic food web organism.
12
23The relative contribution of various
green house gases to global warming is given in the following diagram:
Identify the green house gases.
A ( cdot A=C O_{2} ; B=C H_{4} ; C=N_{2} O ; D=C F C s )
B. ( A=C O_{2} ; B=C F C s ; C=C H_{4} ; D=N_{2} O )
C. ( A=C F C s ; B=C O_{2} ; C=C H_{4} ; D=N_{2} O )
D. ( A=C F C s ; B=C H_{4} ; C=C O_{2} ; D=N_{2} O )
12
24Given is a representation of a type of pollution. Study the picture and answer the question. State one gaseous compound that leads to the depletion of the ozone layer
and creates ‘Ozone holes’.
12
25if the percentage of air pollution from different sources are given in the table.
With the help of this, answer the following questions:
Sources of air ( quad ) Industry ( quad ) Transportation pollution
Percentage ( quad 52 % ) 27%
a) Which are the two sources to be
monitored more to control air pollution?
(b) Mention the preventive measure for each one of these two sources to control
air pollution?
12
26Biological Oxygen Demand (BOD) is a
measure of
A. Industrial wastes poured into water bodies
B. Extent to which water is polluted with organic compounds.
c. Amount of carbon monoxide inseparably combined with haemoglobin
D. Amount of oxygen needed by green plants during night
12
27Identify the wrong statement with
reference to UV rays.
A. UV-A is more harmful to animals than UV-B.
B. UV radiation falls in the range between ( 100-300 mathrm{nm} ) wavelength.
C. UV radiation is classified into three categories.
D. UV radiation kills microorganisms.
12
28In the environment, ozone is known for
its
A . Harmful effects
B. Useful effects
c. Both A and B
D. Inert nature
12
29Continuous sewage flow into a stream would lead to
A. Eutrophication
B. Algal bloom
c. Depletion of oxygen
D. Increase in temperature
12
30A lake with an inflow of domestic
sewage rich in organic waste may result in:
A. Drying of the lake very soon due to algal bloom.
B. An increased production of fish due to lot of nutrients
c. Death of fish due to lack of oxygen.
D. Increased population of aquatic food web organisms.
12
31Write name of any two green house
gases.
12
32Ozone hole over Antarctica was first
detected by
A. Molina and Rowland
B. Farman et al
c. Augus
D. Molina and Molina
12
3371. Depletion of ozone layer causes
(a) blood cancer (b) skin cancer
(c) lung cancer
(d) breast cancer
12
34The release of ( C O_{2} ) into air can cause:
A. Global warming
B. Eutrophication
c. Acid rain
D. Respiratory problems
12
35Green house effect is warming due to
A. Infra-red rays reaching earth
B. Moisture layer in atmosphere
C. Increase in temperature due to increase in carbon dioxide concentration of atmosphere
D. Ozone layer of atmosphere
12
36Which one of the following organisms is likely to show the highest concentration of DDT, once it has been introduced into
the ecosystem?
A. Grasshopper
B. Toadd
c. snake
D. cattle
12
37Lead in the atmosphere can cause
A. Brain damage
B. Breathlessness
c. Itching eyes
D. Respiratory ailments
12
38is continuously formed by the action of UV rays on molecular oxygen and also degraded into molecular oxygen in the stratosphere.12
39101. BOD is:
(a) The amount of oxygen required to convert the NO in
to NO, in a certain volume of a sample of water.
(b) The amount of Fions required to convert, one mole
of hydroxyapatite into fluorapatite.
(c) The amount of oxygen required by bacteria to break
down the organic matter present in a certain volume
of a sample of water.
(d) The amount of oxygen required to break down the
nonbiodegradable waste.
12
40The main factor responsible for the depletion of ozone layer is addition of in the atmosphere.
( mathbf{A} cdot M n )
в. ( C l )
c. ( N a )
D. ( C o )
12
41Which of the following gases is regarded as an atmospheric pollutant?
( A cdot O_{2} )
в. ( O_{3} )
( c cdot s O_{2} )
D. ( N_{2} )
12
42Measurement of the rate of
oxygen consumption in unit volume of water over a period of time is done to find out
A. Biogas generation
B. Biological oxygen demand
c. Biosynthetic pathways
D. Fermentation
12
43Antinocking agent added to petrol is commonly
A. Tetramethyl or tetraethyl lead
B. Dibromoethane
c. Both A and B
D. octane
12
44Which one of the following is a greenhouse gas?
A. oxygen
B. Methane
c. Sulphur dioxide
D. Nitrogen
12
45Explain some harmful effects of agricultural practices on the environment.12
46Green house effect is due to
A. X-rays
B. UV rays
c. Green rays
D. Infra-red rays
12
47Assertion
UV radiation cause photo dissociation
of ozone into ( O_{2} ) and 0 thus causing
damage to stratospheric ozone layer.
Reason
Ozone hole is resulting in global warming and climatic change.
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
12
48“BOD is commonly calculated as an index of water pollution.”
(a) Do you agree with this statement? Why?
(b) Expand BOD.
12
49Which component of the cooked food should not be disposed off into the
drain?
A. Dry vegetables
B. Oil/ghee
c. Supernatent liquid
D. None of the above
12
50Which one of the following is not a device used to control a particulate
matter?
A. Arresters
B. Scrubbers
c. Filters
D. Electrostatic precipitator
E. Incinerator
12
51High BOD indicates
A. Highly polluted water
B. Less pollution in water
c. Less sewage
D. Less microorganisms
12
52159. Select the correct statement about ozone hole out of +
following
(a) It is thinning of ozone layer of stratosphere at some
places
(b) It is a hole formed in troposphere from which ozon
oozes out
(c) It is a hole formed in stratosphere from which ozone
oozes out
(d) It means vanishing of ozone layer around the earth
completely
12
53Which of the following statements is
related to biological magnification?
A. There is a progressive increase in biological activities through trophic levels
B. There is a progressive increase in the level of harmful substances through trophic levels.
C. There is a progressive increase in the body weight through trophic levels.
D. There is a progressive increase in the number of organisms through trophic levels.
12
54Ozone depletion in stratosphere shall result in.
A. Forest fires
B. Increased incidence of skin cancer
c. Global warming
D. None of the above
12
55Hardness of water is mainly due to the
dissolved salts of calcium and
magnesium.
A. True
B. False
12
56Temperature is generally increasing making the earth a hot plate. Mention
any two measures to control global warming.
12
57Maximum greenhouse gas is released by which country?
A. India
B. France
c. usa
D. Britain
12
58During the past century, the temperature of the earth has increased
by ( 0.6^{circ} mathrm{C}, ) most of it during the last few decades. Rise in temperature causes deleterious changes in the environment, thus leading to increased melting of polar ice caps as well as other places like Himalayan snow caps. Suggest any two control measures that will reduce global warming?
12
59Which among the following is likely to have the highest levels of DDT
deposition in its body?
A. sea gull
B. Phytoplankton
c. Eel
D. crab
12
60Assertion
Chlorofluorocarbons are responsible for
ozone depletion.
Reason
Ozone level decreases by as much as
( 67 % ) every year.
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.
12
61If there is no ( C O_{2} ) in the atmosphere
what would happen to the earth’s temperature?
A. It would, be less than the present.
B. It would,be the same as present.
c. It would be higher than the present
D. It depends on the ( 0_{2} ) content of air.
12
62The stratospheric ozone depletion leads
to
A. Global warming
B. Increase in the incidence of skin cancers
c. Forest fires
D. All of the above
12
63What is global warming? Mention any four measures to control global warming.12
64The excess presence of which of the following cause the teeth of children mottled and discolored?
A. Hardness
B. calcium
c. salt
D. Fluoride
12
65Assertion
Algal blooms occur in nutrient poor
water.
Reason
Algal blooms make water unfit for
human consumption but cause enormous growth of fish.
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
12
66109. Soil pollution is due to
(a) insecticides
(c) herbicides
(b) pesticides
(d) All of these
12
67Runoff of excess fertiliser from farm
fields into nearby waterways can result in
A. Ozone depletion
B. Air pollution
c. Biomagnification
D. Acidification
E. Eutrophication
12
6829. The type of pollution caused by spraying of DDT is/are
(a) Air, water and soil (b) Air and water
(c) Air
(d) Air and soil
12
69Social forestry is
A. Management and protection of forest
B. Afforestation of barren and deforested lands
C. Done with the purpose of helping environmental social and rural development
D. All of the above
12
70Which one of the following erosion processes is a natural process?
A. Geological erosion
B. Accelerated erosion
c. Gully erosion
D. Rill erosion
12
71How do ultraviolet rays coming from sun affect the living organisms?12
72Identify the harmful radiations emitted by the sun.
A . Ultra violet
B. Infra red
c. Visible
D. Radio waves
12
73Which of the following option is a water pollutant as well as a detrimental/toxic to marine flora and fauna to a large
extent?
A. Oil spillage during oil drilling
B. Sewage waste
c. Biological waste
D. None of the above
12
74The major pollutants to deplete ozone
are
A. Chlorofluorocarbons
B. Nitrogen oxides
c. Hydrocarbons
D. All of the above
12
75Which gas is emitted by the combustion of fossil fuels?
A. ( C O_{2} )
в. ( S O_{2} )
( mathrm{c} cdot H_{2} )
D. ( N O_{2} )
12
76Which one is not dangerous for life and atmosphere?
A. Biopollutants
B. Ozone layer
c. Nuclear blast
D. Deforestation
12
77Assertion
Methane is a component of greenhouse gases and contributing to global warming about 20 percent.
Reason
Introduction of multi-point fuel
injection engines in automobiles has decreased methane content in the
exhausts.
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.
12
78Study the graph. Explain how is oxygen concentration affected in the river when
sewage is discharged in it.
12
7942. Which causes water pollution?
(a) Pathogens
(b) Automobile exhausts
(c) PCBs
(d) (a) and (c)
12
80A large quantity of urban sewage is drained to a nearby river. Which among the given conditions would happen after mixing of sewage into the river?
(i) BOD of receiving water body increases.
(ii) DO of receiving water body decreases.
(iii) It will not cause mortality among fishes and other aquatic creatures.
(iv) It will lead to nutrient enrichment of
receiving water body.
A. i, ii and iii
B. i, ii and iv
c. ii and iii
D. iii and iv
12
81Checking of reradiating heat by
atmospheric dust, ( O_{3}, C O_{2} ) and water vapours is
A. Ozone layer effect
B. Radioactive effect
c. Greenhouse effect
D. Solar effect
12
82201. Which of the following is an excellent green solvent as
well as greenhouse gas?
(a) Methanol
(b) CFCs
(c) CO
(d) CO2
12
83Which of the following is most common pathogen pollutant?
A . Coliform
B. E. coli bacteria
c. Psedumonas
D. Both A and B
12
8425. Ozone hole refers to
(a) Increase in concentration of ozone
(b) Hole in ozone layer
(c) Reduction in thickness of ozone layer in stratosphere
(d) Reduction in thickness of ozone layer in troposphere
12
85When ( mathrm{PO}_{4} ) and ( mathrm{NO}_{3} ) is more in the water
of a lake it causes
A. Growth of bacteria
B. Growth of fishes
c. Death of algae
D. Algal bloom
12
8667. Pollution is:
(a) removal of top soil
(b) release of toxic/undesirable materials in environment
(c) conservation of energy
(d) all of above
12
87167. Measurement of rate oxygen utilisation by a unit volume
of water over a period of time is to measure:
(a) fermentation (b) biogas generation
(c) biosynthetic pathway(d) biological oxygen demand
12
88Water pollination is best assessed by determining.
A. DO and BOD
B. BOD and turbidity
c. Do and acidity
D. BOD and alkalinity
12
89Which of the following is a largest source of formaldehyde vapour pollution in a room?
A. Utensil
B. Furniture
c. cooking range
D. Books
12
90224. Which of the following is not a consequence of
greenhouse effect?
(a) Climatic conditions will be changed.
(b) Plants in warmer climates with adequate rainfall
would grow faster.
(c) The incidence of infectious diseases is likely to
increase
(d) Malaria will be controlled as the mosquitoes will
not survive.
12
91In a sewage plant, BOD is indicated as high. After sometime it shows a
decrease then
A. There is increase in bacterial growth but decrease in oxygen.
B. There is decrease in bacterial growth but increase in oxygen.
c. There is increase in bacterial growth but increase in oxygen
D. There is decrease in bacterial growth but decrease in oxygen
12
92When domestic sewage mixes with
river water
A. Small animals like rats will die after drinking river water.
B. The increased microbial activity releases micro nutrients such as iron
C. The increased microbial activity uses up dissolved oxygen.
D. The river water is still suitable for drinking as impurities are only about ( 0.1 % )
12
93Which of the following is a point source
of water pollution?
A. Industries
B. Power plants
c. coal mines
D. All of the above
12
94UV radiations cause
A. Formation of thymine dimers
B. Addition of base pairs
C . Deletion of base pairs
D. Methylation of bases
12
95Assertion
Amount of biodegradable present in water is measured by BOD organic
matter
Reason
During biodegradation of organic compounds, oxygen is released.
A. Both A and R are true and R is the correct explanation of
B. Both A and R are true and R is not the correct explanation of
c. A is true but R is false
D. Both A and R are false
12
96Sewage water is purified by
A. microorganisms
B . light
( c . ) fish
D. aquatic plant
12
97Ozone layer depletion may lead to which of the following harmful effects in
organisms?
A. Skin cancer
B. Cataract
c. Damage to the immune system
D. All of the above
12
98Bharat stage emission standards is instituted in India to regulate
A. Air pollution
B. Soil pollution
c. water pollution
D. None of the above
12
99Why is the maximum concentration of
pesticides found in human beings?
12
10015. Which of the following acts as a sink for CO?
(a) Plants
(b) Haemoglobin
(c) Oceans
(d) Microorganism present in the soil
Тимояту
12
101Arrange the following in descending order of their role in soil erosion.
(i) Wind erosion
(ii) Chemical degradation
(ii) Physical degradation
(iv) Water erosion
( mathbf{A} cdot mathbf{i}, ) i, i ii, iv
B. iv, i, ii, iii
c. iv , iii, ii, i
D. iv, ii, iii, i
12
102BOD of lake becomes high by :-
A. Vehicles
B. Wind mill
c. Smoke and ammonia
D. Detergents
12
103Soil erosion is due to
A. Fast running rivers
B. Heavy rains
c. Occasional rains
D. wind
12
104230. Synergism relates to the phenomenon due to
(a) single pollutant
(b) atmospheric gases
(c) water pollutants
(d) two or more pollutants having much more effect
than the total of individual pollutants
12
105With respect to Eichorrnia:
Statement ( X: ) It drains off oxygen from
water and is seen growing in standing
water.
Statement Y : It is an indigenous species of our country.
A. Both statements ( x ) and ( Y ) are correct
B. Both statements X and Y are wrong
c. only statement ( x ) is correct and ( Y ) is wrong
D. only statement Y is correct and X is wrong
12
106Fishes in eutrophic lake is died due to
A. Oxygen
B. Nutrient enrichment
( c cdot C O_{2} )
D. None
12
107Global warming is caused by
greenhouse effect. Justify.
12
108Air pollution is not reduced by
A. Using precipitators
B. Reusing wastes
c. Cleaning air
D. All of the above
12
109Which of the following should be increased to prevent soil erosion?
A. Flow of water
B. Green areas
c. Deforestation
D. None of these
12
110Differentiate between gaseous and
sedimentary cycles.
12
111One day the contractor’s workers appeared in the forest to cut the trees
but the men folk were absent. However,
the women from the village reached the forest quickly and elapsed the tree trunks preventing the workers from felling the trees. Thus, the forest trees
were saved.

The incident was originated in a remote village called “Reni” in Garhwal in the
early 1970 s. By which name is this andolan known as?
A. Amritadevi Andolan
B. Vankatai Andolan
c. Prakruti Samrakshan Andolan
D. Chipko Andolan

12
112Multiple Choice Questions Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers.
A. Methane
B. Nitrous oxide
c. Ozone
D. Ammonia
12
113Name the radiations absorbed by ozone layer.What would happen to living ones on earth of ozone layer around us disappears?12
114If there was no ( C O_{2} ) in the earth’s
atmosphere, the temperature of the earth’s surface would be
A. Same as the present level
B. More than the present level
C. Less than the present level
D. Dependent on ( O_{2} ) content of atmosphere
12
115Nuisance growth of aquatic plants and bloom – forming algae in natural waters is generally due to high concentrations
of
A. Carbon
B. Sulphur
c. calcium
D. Phosphorus
12
116“Determination of biological oxygen demand (BOD) can help in suggesting the quality of a water body”. Explain.12
117Nitrogen oxides released in the
stratosphere cause ozone depletion due
to
A. catalysing conversion of ozone to oxygen
B. Binding ozone
c. Reacting with ozone
D. All of the above
12
118Study the lists and find the correct
match
(a)
(b) ( begin{array}{lll}text { I } & & text { II } \ text { BOD } & text { (i) } & text { Treatment of sewage } \ text { KVIC } & text { (ii) } & begin{array}{l}text { Measure of organic } \ text { matter in water }end{array} \ text { LAB } & text { (iii) } & begin{array}{l}text { Biological methods } \ text { for controlling plant } \ text { diseases }end{array} \ text { STPS } & text { (iv) } & text { Increases vitamin B }_{12} \ & text { (v) } & text { Production of biogas }end{array} )
(c)
(d)
b-iii, c-ii, d-v
( A cdot a-i v )
b-ii, c-iii, d-i
B. a-v,
c. a-ii, b-i, c-iv, d-v
D. a-ii, b-v, c-iv, d-i
12
119Depletion of ozone layer is due to
A. Oxides of nitrogen
B. Oxides of carbon
c. Oxides of sulphur
D. None of the above
12
12031. Which of the following is usually
not an air pollutant ?
(1) Nitrous oxide
(2) Hydrocarbons
(3) Sulphur dioxide
(4) Carbon dioxide
12
121Define pollution. With reference to water pollution, explain biochemical oxygen demand, algal bloom, biomagnification and eutrophication.12
122What is biomagnification?12
123Why is it desirable to use unleaded
petrol in vehicles fitted with catalytic
converters?
12
124The diagram given shows the green
house effect. Which of the following would have been in the absence of
greenhouse effect in the atmosphere?
A. Pollution will increase
B. Earth’s surface temerature will decrease
c. Earth surface temperature will increase
D. Earth’s surface temperature remains the same
12
125Eutrophication results in the reduction
of
A. Dissolved hydrogen
B. Dissolved oxygen
c. Mineral salts
D. None of the above
12
126PUC certificate is omitted to the
vehicles which
A. Run under low consumption of fuel
B. Has low emission
C. Greater acceleration power
D. None of the above
12
127Farm land tends to erode most rapidly when planted with
A. Wheat
B. Potato
c. saccharum
D. Clover
12
128Burning of fossil fuels is the main
cause of release of dioxide
gas in air.
12
129Soil erosion can be prevented by
A. Raising forests
B. Deforestation
C. Excessive use of fertilizer
D. Overgrazing by animals
12
130The excess of fertilizers not consumed
by crops are washed away from land by rain and pollute
A. water
B. air
c. noise
D. soil
12
131Catalytic converter used for controlling pollution is used in
A. Thermal plants
B. Chimneys
c. Brick kilns
D. Motor vehicles
12
132UV light radiation cause
A. Formation of pyrimidines
B. Photodynamic action
c. Breakage of hydrogen bonds in DNA
D. Protein denaturation
12
133Which of the following industries are responsible for water pollution? This question has multiple correct options
A. Oil refineries
B. Paper factories
c. textile and sugar mills
D. chemical factories
12
134Increased ( C O_{2} ) concentration in the
atmosphere leads to
A. Global warming
B. Eutrophication of lakes
c. Depletion of the ozone layer
D. Magnification in the food chain
E. Acid rain
12
135Pesticides ( & ) insecticides are available
in the form of :
A. powders
B. sprays
c. emulsions
D. all of these
12
136Define Ozone layer.12
137Green house effect means
A. Increase in the temperature of earth due to high
concentration of ( mathrm{NO}_{2} )
B. Increase in the temperature of earth due to high concentration of ( mathrm{SO}_{2} )
C. Increase in the temperature of earth due to high concentration of CO
D. Increase in the temperature of earth due to high concentration of ( mathrm{CO}_{2} )
12
138Ultraviolet light causes
A. Destruction of hydrogen bonds between complementary DNA strands
B. Photodynamic action
c. sticky metaphases
D. Formation of pyrimidines
12
139Mists are produced by:
A. smoke formed during combustion of organic matter
B. particles of spray liquids and by condensation of vapours in air
C. fine solid particles produced during crushing and grinding
D. condensation of vapours during chemical reactions
12
140In atmosphere, Ozone hole refers to
A. A hole in ozone layer
B. Decrease in ozone layer thickness in troposphere
C. Decrease in thickness of ozone layer in stratosphere
D. Increase in the thickness of ozone layer in troposphere
12
141Which one of the following pairs
in mismatched-
A. Nuclear power radioactive wastes
B. Solar energy green house effect
C. Fossil fuel burning release of ( C O_{2} )
D. Biomass burning release of ( C O_{2} )
12
14290. Chlorofluorocarbon releases which of the following
chemical harmful to ozone:
(a) fluorine
(b) chlorine
(c) nitrogen peroxide (d) sulphur dioxide
12
143Removal of the soil by the action of wind and water is known as
A. Errosion
B. Fossilization
c. Leaching
D. Calcification
12
144Which of the following chemicals is responsible for the depletion of ozone layer in the atmosphere?
A. Sulphur dioxide
B. Nitrous oxide
c. Chlorofluorocarbons
D. Carbon dioxide
12
145A lake which is rich in organic waste
may result in
A. Increased population of fish due to lots of nutrients
B. Mortality of fish due to lack of oxygen
C. Increased population of aquatic organisms due to minerals
D. Drying of the lake due to algal bloom
12
146Gaseous pollutants are controlled
through
A. Adsorption
B. ESP
c. Arrestors
D. Pyrolysis
E. Incineration
12
147Write the full form of BOD.12
14847. The natural greenhouse effect is crucial in maintaining
the proper temperature for life on Earth. Thus,
(a) without it, Earth would be permanently covered
with ice
(b) increase in CO, content, increases global warming
(c) Both (a) and (b) are correct
(d) None of the above are correct
12
149Write the essential function performed by the ozone layer.12
150Which of the following statements does
not apply to eutrophication.
A. It is natural ageing of a lake by nutrient enrichment of its water
B. In a young lake the water is cold and clear and supports less life
C. The nutrients such as sulphur and phosphorus encourage the growth of aquatic organisms in the lake
D. Pollutants released by man radically accelerate the ageing process of a lake
E . Overgrowth of algae leads to scum that depletes the level of dissolved oxygen in water
12
151Loss of top soil is called as
A. Corrosion
B. Washing
c. Denudation
D. None of the above
12
152The term ‘bio-magnification’ refers to
the
A. Increase in population size
B. Increase in the concentration of non-degradable pollutants as they pass through the food chains
C. Blowing up of environmental issues by man
D. Growth of organisation due to food consumption
12
153The common refrigerant chlorofluoro-
methane (freon) and ( mathrm{NO}_{2} ) is a serious
pollutant because
A. It lowers atmospheric temperature.
B. It prevents cloud condensation
c. It destroys haemoglobin
D. It disrupts ( O_{3} ) layer.
12
154148. Which one of the following gases is responsible for
global warming as well as ozone layer depletion?
(a) CO,
(b) 0,
(c) CFCs
(d) N
12
155Assertion
Algal blooms occur in nutrient poor
water.
Reason
Algal blooms make water unfit for
human consumption but cause enormous growth of fish.
A. Both A and R are true and R is the correct explanation of
B. Both A and R are true and R is not the correct explanation of
c. A is true but R is false
D. Both A and R are false
12
15627. Minamata disease is caused by
pollution of water by :
(1) lead (2) tin
(3) methy isocyanate
(4) mercury
12
157Excessive exposure of humans to UVrays results in
This question has multiple correct options
A. damage to immune system
B. damage to lungs
c. skin cancer
D. peptic ulcers
12
158World climate is threatened by increase in the concentration of
A. Oxygen
B. Nitrogen
C. Water vapours
D. Carbon dioxide
12
159Modes of controlling pollution in large
cities include
A. Cleanliness and less use of insecticides
B. Proper disposal of organic wastes, sewage and industrial effluents
c. Broader roads and shifting of factories out of the residential areas
D. All of the above
12
160Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected to BOD test. The samples were labelled
( A, B ) and ( C ; ) but the laboratory attendant did not note which was which. The BOD
values of the three samples ( A, B ) and ( C ) were recorded as ( 20 m g / L, 8 m g / L ) and ( 400 m g / L, ) respectively. Which sample
of the water is most polluted? Can you assign the correct label to each assuming the river water is relatively clean?
12
161Increased level of carbon dioxide in the
atmosphere traps the heat rays reflected by the earth causing an increase in the temperature on the
earth. This is
A. Local warming
B. House warming
c. Global warming
D. Country warming
12
162What happen when rain falls on soil without vegetational cover?
A. Rain water percolates into soil efficiently.
B. Rain water cause loss of surface soil.
c. Rain water leads to fertility of the soil.
D. Does not cause any changes in the soil
12
163Bag filters are used for removal of
pollutants from
A. Exhaust emissions
B. Effluent water
c. Sewage water
D. Both B and C
12
164Read the following statements and select the correct option.
Statement 1: Ozone layer present in the stratosphere protects the living organisms from harmful UV rays coming from the sun by absorbing nearly all of them.

Statement 2: Ozone formed in the
troposphere by photochemical
reactions as a result of human
activities which is harmful to all living organisms.
A. Both statements 1 and 2 are correct
B. Statement 1 is correct but statement 2 is incorrect
c. statement 1 is incorrect but statement 2 is correct
D. Both statements1 and 2 are incorrect

12
165Pallavi got PUC certificate for her vehicle which indicates which of the
following criteria for the vehicle?
A. It has low rate of emission
B. It is equipped with new technology
c. It has greater fuel capacity
D. None of the above
12
166Thermal plants have installed
A. Cyclone collector
B. Porous filters
C. Electrostatic precipitators
D. Adsorbents
12
167Chipko andolan originated in
A. Karnataka
B. Uttarakhand
c. Kerala
D. Rajasthan
12
16848. Activated sludge treatment is
called :
(1) Preliminary treatment
(2) Biological treatment
(3) Pre treatment
(4) Chemical treatment
12
169Which of the following strategy is not a
correct approach to reduce global warming?
A. Reducing the green house gas emission by limiting the use of fossil fuels.
B. Increase the vegetation cover, particularly the forest for photosynthetic utilization of ( C O_{2} )
C. Minimizing the use of nitrogen fertilizers in agriculture for reducing ( N_{2} ) O emission.
D. Increasing the use of air conditioners, refrigeration unit and production of plastic foams and propellants in aerosal spray cans.
E. Developing substitutes for chlorofluorocarbons.
12
17072. Which of the following gases is not a greenhouse gas?
(a) HO vapours (b) 02
(c) CH.
(d) CO2
12
171Ozone in stratosphere extends
( mathbf{A} cdot 10-20 mathrm{km} )
B. 20-25km
c. ( 15-30 k m )
D. 25-40km
12
172Assertion
The concentration of pollutants in water or atmosphere is often expressed in terms of ppm.
Reason
Concentration in parts per million can be expressed as mass to mass, volume
to volume and mass to volume
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
12
17386. Persistent pesticides such as DDT pass into food chain
and increase in amount per unit weight of organism due
to their accumulation in fat. This phenomenon is called
(a) biomagnification (b) biodegradation
(c) biosynthesis (d) decomposition
12
174Which of the following options is a major water pollutant nowadays?
A. Industrial effluents and waste
B. Agricultural waste
c. Domestic waste
D. None of the above
12
175Which of the following cause alkalinity in natural water?
A. Sodium carbonate
B. Potassium carbonate
c. Potassium bicarbonate
D. All of the above
12
176High concentration of greenhouse gases has resulted in maximum rise of
atmospheric temperature in
A. Tropic region
B. Middle latitude
c. Polar region
D. Temperate region
12
177Result of ozone hole is
A. Green house effect
B. Global warming
C. Acid rain
D. UV radiations reach the earth
12
178Which gas is released by improper or incomplete combustion and are generally emitted from vehicles?
( A cdot S O_{2} )
в. ( C O )
c. ( N O )
D. ( C O_{2} )
12
179List out the effects of global warming
and efforts to control global warming.
12
180The automobile emission can be
reduced by adding which of the following in the petrol?
A. Barium salts
B. Cadmium salts
c. cobalt salts
D. silicon 011
12
181Ozone layer of upper atmosphere is being destroyed by
A. Sulphurdioxide
B. Carbondioxide
c. chlorofluorocarbon
D. Smogg
12
182Eutrophication is found in
A. Agricultural land near thermal plant
B. Saline soil
c. Lake
D. Mountain
12
183Assertion
Suspended particulate matter (SPM) is an important pollutant released by diesel vehicles.
Reason
Catalytic converters greatly reduce pollution caused by automobiles.
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
12
184BOD is
A. The-amount of ( O_{2} ) utilised by organisms in water
B. The amount of ( O_{2} ) utilised by micro organisms for decomposition
C. The total amount of ( O_{2} ) present in water
D. All of the above
12
185Ozone hole is
A. Hole of ozone layers
B. Decrease in concentration of ozone
C. Thining of ozone in stratosphere
D. Increase of ozone in antartic region
12
186Decomposition of organic wastes in
water causes
A. Eutrophication
B. Desertification
c. soil erosion
D. Both A and B
12
187Ultraviolet radiations from sunlight cause a reaction which produces
( A cdot O_{3} )
в. ( S O_{2} )
( c cdot c o )
D. ( C H_{4} )
12
188217. Select the correct terms.
DO(a) Biodegradable pollutants: Which are degraded by
natural processes rapidly
(b) Non-biodegradable pollutants: Which are slowly
degraded and remain in the environment in an
unchanged form for many decades
(c) Both (a) and (b)
(d) None of the above
12
189Ozone hole is widest over
A. Equator
B. North pole
C. North temperate area
D. Antarctica
12
190Assertion
UV radiation causes photo-dissociation of ozone into ( O_{2} ) and ( 0, ) thus causing damage to the stratospheric ozone layer.
Reason
Ozone hole is resulting in global warming and climate change.
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
12
191BOD is related with
A . Organic matter
B. Microbes
c. Both A and B
D. None of the above
12
192The greatest algal count in response to phosphorus addition was observed at
location
Control
Nitrogen
Phosphorus
( A )
B. 2
( c cdot 3 )
( D cdot 4 )
( E . )
12
193Elements can be diagonsed by
A. Emission spectroscopy
B. NMR spectroscopy
C. Infra-red spectroscopy
D. Absorption spectroscopy
12
194Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
A. Eutrophication
B. Pollution
c. Biomagnification
D. Accumulation
12
195146. Addition of phosphate fertilizers to water bodies cause
(a) enhanced growth of algae
(b) increase in amount of dissolved oxygen in water
(c) deposition of calcium phosphate
(d) increase in fish population
12
196Which of the following is not a green
house gas?
A. Methane
B. Carbon dioxide
c. Nitrous oxide
D. Ammonia
12
197Name the radiations absorbed by ozone layer. What would happen to living ones
on earth of ozone layer around us disappears?
12
198Result of ozone hole is
A. UV radiation reaching earth
B. Green house effect
C. Acid rain
D. Global warming
12
199Biological Oxygen Demand (BOD) is a
measure of
A. Industrial wastes poured into water bodies
B. Extent to which water is polluted with organic compound
C. Amount of carbon monoxide inseparably combined with haemoglobin
D. Amount of oxygen needed by green plants during night
12
200A fish-eating bird species was found to
have a specific, heavy metal
concentration of 700,000 ppt (parts per
trillion). The conclusion based on the
data is
A. Air pollution may have caused this bird species to inhale dangerous amounts of heavy metals while migrating.
B. The entire population of the bird species, from which this sample was taken, died
C. The population of this bird species exploded, causing an ecosystem imbalance.
D. Pollutants tend to collect in areas of land where this
bird species nests.
E. This bird species is at a high trophic level on the food chain.
12
201Maximum green house gas released by which of the following country?
A. India
B. France
c. china
D. Britain
12
202Marsh gas mainly contains
( A cdot S O_{2} )
B. ( mathrm{cO}_{2} )
( mathrm{c} cdot mathrm{cH}_{4} )
( D cdot H_{2} O )
12
203151. Most abundant water pollutant is:
(a) detergents
(b) pesticides
(c) industrial wastes (d) ammonia
12
204Why are cholorofluorocarbons supposed to be responsible for depletion of ozone
layer? Explain.
12
205A lake with an inflow of domestic
sewage rich in organic waste may result in
A. Drying of the lake very soon due to algal bloom
B. An increased production of fish due to lot of nutrients
c. Death of fish due to lack of oxygen
D. Increased population of aquatic food web organisms
12
206When huge amount of ( mathrm{CO}_{2} ) is dumped into a river, the BOD will
A. Increase
B. Slightly decrease
c. Remain unchanged
D. Decrease
12
207In the event of global warming, which one of the following is most likely to
occur?
A. Existing plant and animal communities will move North in response to warming.
B. Agriculture in the prairie provinces will be redeveloped on soils of the Canadian Shield
c. The anticipated rise in sea level will be caused primarily by the melting of polar ice caps
D. The decomposition of organic matter in the unfrozen surface layer of polar soils will increase
12
208How does algal bloom destroy the quality of a fresh water body? Explain.12
209Which of the following is true regarding greenhouse effect?
A. Increase in the temperature of the earth due to high concentration of ( mathrm{NO}_{2} )
B. Increase in the temperature of the earth due to high concentration of ( mathrm{SO}_{2} )
C. Increase in the temperature of the earth due to high concentration of ( mathrm{N}_{2} )
D. Increase in temperature of the earth due to highh concentration of ( mathrm{CO}_{2} )
12
210Which layer is considered crucial for
the existence of the ecosystems on the planet which is depleting due to increased pollution?
A. Inner
B. Outer
c. Middle
D. Ozone
12
211If there is no greenhouse effect, then the average temperature at surface of earth would have been
A . 15
B. -18
( c .-6 )
D. 10
12
212Water pollution can be caused due to:
A. chemicals
B. pathogens
c. discoloration
D. all of above
12
213100. Sewage containing organic waste should not be disnog
in water bodies because it causes water pollution. Fishe
in such a polluted water die because of
(a) large number of mosquitoes
(b) decrease in the amount of dissolved oxygen
(c) increase in the amount of dissolved oxygen
(d) clogging of gills by mud
12
214Explain the cause of algal bloom in a
water body. How does it affect an
ecosystem.
12
215Which of the following is the best
measure to save energy?
A. Each individual uses his own vehicle
B. Four colleagues residing in the same colony travel to the office together by the same car
C. Using vehicles to travel small distances
D. Keeping the vehicle engine ‘on’ during traffic jam
12
216Explain the relationship between CFCs and ozone in the stratosphere.12
217When domestic sewage mixes with
river water
A. Small animals like rats will die after drinking river water.
B. The increased microbial activity release micro nutrients, such as iron.
C. The increased microbial activity uses up dissolved oxygen.
D. The river water is still suitable for drinking as impurities are only about ( 0.1 % )
12
218The molecular action of ultra violet light is mainly reflected through
A. Photodynamic action
B. Destruction of hydrogen bonds between DNA strands
c. Formation of pyridine
D. Destruction of ester bonds
12
219What is eutrophication?
A. Increased concentrations of chemical nutrients
B. Increased level of water
C. Oxygen depletion
D. None of the above
12
220can removes over ( 99 % )
particulate matter present in exhaust from a thermal power plant.
12
221In human body, chlorinated hydrocarbons accumulate in
A. Bones
B. Brain
c. Fatty tissue
D. skin
12
222There is a hole in the ozone layer. What
do you understand by this?
12
223Which of the following organism is likely to have more concentration of
D.D.T in its body?
A. Herbivores
B. Carnivores
c. Top carnivores
D. Primary producers
12
224Factory waste is neutralized before
disposing it off into the water bodies. Explain why?
12
225Find the odd one out for the example of natural air pollutant.
A. pollen, spores
B. Insecticides
c. volcanic gases
D. agricultural burning
12
226waters off the Eastern coast of the
United States was examined by
scientists. The results are depicted in
the graph which shows the algal count at 6 different locations. The control was
also carried out without the addition of
nutrients.
The greatest increase in algae in
response to phosphorus addition is shown by location
Control Nitrogen
Phosphorus
( A )
( B .2 )
( c cdot 3 )
( D cdot 4 )
( E )
12
227Melanin protects us from
A. ( x ) -rays
B. Infra-red rays
C. Visible rays
D. UV rays
12
228Vehicular standard based on European regulation was first introduced in in India.
A. 2000
B . 1999
( c .200 )
D. 1997
12
229A river/ lake with an inflow of domestic
sewage rich in organic waste may result in
A. Death of fish due to lack of oxygen
B. Drying of the river/ake very soon due to algal bloom
c. Increase population of aquatic food web organisms
D. An increased production of fish due to biodegradable nutrients
12
230Which of these describes a way in
which air pollution has been reduced?
A. Raising cattle for food
B. Using fossil fuels
c. Using unleaded gasoline
D. Releasing ozone into the atmosphere
E. Releasing greenhouse gases
12
23168. Consider the following diseases from which human
beings are suffered.
(I) Asthma
(II) Dyspepsia
(III) Bronchitis (IV) Emphysema
Diseases due to SO, are
(a) I, III and IV (b) II, III and IV
(C) I, II and III (d) Both I and IV
12
232Eutrophication means
A. Toxication of water by fertilisers
B. Decrease in the growth of algae
C. Increase in the fertility of the soil
D. All of the above
12
233Biochemical Oxygen Demand (BOD) in a
river water
A. Remains unchanged when algal bloom occurs.
B. Has no relationship with concentration of oxygen in the water.
C. Gives a measure of salmonella in the water.
D. Increases when sewage gets mixed with river water.
12
234Social Forestry Programme was adopted in India during
A . 196
B. 1971
( c cdot 1976 )
D. 1986
12
235173. Ozone destroying reaction is
03 +0 +202
This ozone destroying reaction can be due to
(1) NO
(II) CFCs
(III) N
Select the correct gases.
(a) Only II
(b) I, II and III
(c) Both I and III (d) Both I and II
12
236All of these will directly or indirectly
reduce the contribution to greenhouse
gases except
A. Encouraging the use of public transportation
B. Walking
C. Biking
D. Increasing the cost of car ownership and fuel costs
E. Creating car-free zones
12
237In vehicles, catalytic converters are
used
A. To increase mileage of vehicles
B. To convert ( C O_{2} ) into carbonates
C. To increase the efficiency of lead mixed petrol
D. To convert ( C O ) to ( C O_{2} )
12
23819. The gas responsible for ozone depletion is
(a) CO
(b) SO,
(c) CO
(d) NO and freons
12
239Presence of CFCs in the atmosphere is responsible for
A. Formation of ozone
B. Production of healthy plants
c. Depletion of ozone layer
D. None of these
12
24030. Sewage mostly constitutes
(a) Effluents
(b) Biodegradable pollutants
(C) Non-biodegradable pollutants
(d) Air pollutants
12
241Explain the effect on the characteristics
of a river when urban sewage is
discharged into it.
12
242Which water pollutant is incorrectly paired with the source?
A. Oil spill- ship
B. Pesticide – -Oil palm plantation
c. Sewage-Large factory
D. Nitrate – Farm
12
243Which of the following is not a green-
house gas?
A. water vapour
B. Carbon dioxide
c. Methane
D. oxygen
12
244By the end of 2002 , the public transport
of Delhi switched over to a new fuel.
Name the fuel. Why is this fuel considered better? Explain.
12
245184. Which of the following helps in creating ozone over
Antarctica?
(a) Radioactive clouds (b) Polar stratospheric clouds
(c) Spring clouds (d) Smoke clouds
12
24641. Ozone is an important constituent of stratosphere
because it
(a) Destroys bacteria which are harmful to human life
(b) Prevents the formation of smog over large cities
(c) Absorbs ultraviolet radiation which is harmful to
human life
(d) Removes poisonous gases of the atmosphere by
reacting with them
12
247Multiple Choice Questions
Which one of the following is
mismatched?
A. Fossil fuel burning – Release of ( C O_{2} )
B. Nuclear power – Radioactive wastes
C. Solar energy – Green house effect
D. Biomass burning – Release of ( C O_{2} )
12
248What can you as an individual do to reduce your consumption of the various
natural resources?
12
249Discuss briefly the following:
(a) Greenhouse gases
(b) Catalytic converter
(c) Ultraviolet B
12
250High BOD indicates
A . Highly polluted ( H_{2} O )
B. Less pollution in ( H_{2} O )
c. Less sewage
D. Less microorganism
12
251Drinking mineral water drink with low
levels ( (sim 0.02 ) ppm ) of pesticide for long period would
A. Cause cancer of intestine
B. Lead to accumulation of pesticides in the body
c. Cause leukaemia in most of the people
D. Produce immunity against mosquito
12
252177. Due to increase in 0, level, there can be
(a) impair vision
(b) excessive accumulation of fluid in lungs
(c) irritation in eyes, nose and throat
(d) All of these
12
253Who is the greatest enemy of nature
and organism?
12
25450. Which of the following statement is not true?
(a) pH of drinking water should be between 5.5-9.5
(b) Concentration of DO below 6 ppm is good for the
growth of fish
(c) Clean water would have a BOD value of less than 5
ppm.
(d) Oxides of sulphur, nitrogen and carbon are the most
widespread air pollutant.
12
255The enhanced growth of water hyacinth
in lakes can be due to
A. Disposal of solid wastes in water bodies
B. Availability of more nutrients to the flora of a water ecosystem
c. Discharge of sewage into water bodies
D. All of the above
12
256Greenhouse effect is due to the
presence of
A. Ozone layer in the atmosphere
B. Infrared light reaching the earth
C. Moisture layer in the atmosphere
D. ( mathrm{CO}_{2} ) layer in the atmosphere
12
25745. Water pollution is less if BOD is:
(a) less than 5 ppm (b) less than 15 ppm
(c) less than 50 ppm (d) less than 100 ppm
12
258Ozone hole is caused by
A. Acetylene
B. Ethylene
C. Chlorofluorocarbons
D. Methane
12
259The growth of fish gets inhibited if the concentration of dissolved oxygen in water is:
A. less than 2ppm
B. less than 6ppm
c. less than 15 ppm
D. less than 17ppm
12
260The gas that usually causes explosion
in coal mines is
A. methane
B. carbon monoxide
c. carbon dioxide
D. hydrogen
12
261112. Disinfection of water removes
(a) hardness
(b) taste
(c) colour
(d) bacteria
12
262Match the column:
List I list II ( quad ) List III A) BOD ( quad ) i) Supernatant
as effluent ( begin{array}{ll}text { B) } & text { ii) Measure of } \ text { FLOCS } & text { Organic Matter }end{array} ) All ( | textrm{ } )
( mathrm{sol} ) SOlids
( mathrm{n} ) te carbon ( begin{array}{l}text { C) } \ text { Primary } \ text { sludge }end{array} mid begin{array}{l}text { iii) Masses of } \ text { bacteria } \ text { associated with } \ text { fungus }end{array} ) has more
( mathbf{A} cdot A-i i, I V B-i i i, I C-i,|D-i v,| I )
B. A-ii, I B-i, III C-iv, II D-iii, IV
C ( . A ) -i, IV B-iii, II C-iv, I D-ii, III
D. A-ii, III B-ii, IV C-iii, I D-i, II
12
263Issue of PUC certificate can control
A. Noise pollution
B. Water pollution
c. Sound pollution
D. Air pollution
12
264For how long and at what temperature an experiment is run to determine the value of ( B O D ) of a water body?
A ( cdot 10^{circ} mathrm{C} ) for 10 days
B. ( 20^{circ} mathrm{C} ) for 5 days
c. ( 20^{circ} mathrm{C} ) for 2 days
D. ( 5^{circ} mathrm{C} ) for 20 days
12
265164. Domestic waste mostly constitutes:
(a) non-biodegradable pollution
(b) biodegradable pollution
(c) effluents
(d) air pollution
12
266Decomposition also has a role to play during photosynthesis. Support the statement.12
267Excess of carbon dioxide in the
atmosphere leads to
A. Global warming
B. Ozone depletion
c. Acid rain
D. None of the above
12
268Assertion
BOD(Biological oxygen demand) is a
device that is used to measure quality
of water.
Reason
High BOD is observed in highly polluted
water
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
12
269Snow blindness is cause due to
A. Ozone hole
B. Nuclear winter
c. Acid rain
D. Green house effect
12
270Peeling of ozone umbrella is due to
A. CFCs
B. PAN
( c cdot C O_{2} )
D. Coal burning
12
271Chlorofluorocarbons are not
recommended to be used in
refrigerators, because they
A. Increase temperature
B. Depletes ozone
c. Affects environment
D. Affects human body
12
272Multiple Choice Questions Eutrophication of water bodies leading to killing of fishes is mainly due to nonavailability of.
A. Food
B. Light
c. Essential minerals
D. oxygen
12
273Ozone layer of upper atmosphere is being destroyed by
A. Chlorofluorocarbons
в. ( S O_{2} )
c. ( operatorname{smog} )
D. None of the above
12
274Explain with the help of two examples how the participation of local people has led to conservation of forest in the
past.
12
275If ( mathrm{CO}_{2} ) is absent in atmosphere of earth
then
A. Temperature will decrease
B. Temperature will increase
C. Plants will flourish well
D. No effect
12
27666. Atmospheric gases are found to trap the sun’s heat
near the earth’s surface and keep it warm. This effect is
called
(a) greenhouse effect (b) Joule’s effect
(c) thermal effect (d) None of these
12
277Motor vehicles equipped with catalytic converter are advised to use unleaded
petrol because
A. Lead is a heavy metal
B. Lead causes inactivation of catalyst present in catalytic converter
c. Lead decreases the efficiency of vehicle
D. Lead increases burning of petrol
12
278Today, the concentration of greenhouse gases is very high because of
A. Use of refrigerator
B. Increased combustion of oils and coal
c. Deforestation
D. All of the above
12
279A river with an inflow of domestic
sewage rich in organic waste may
result in
A. Drying of the river very soon due to algal bloom
B. Increased population of aquatic food web organisms
c. An increased production of fish due to biodegradable nutrients
D. Death of fish due to lack of oxygen
12
280Excessive growth of planktonic algae in nutrient rich water is known as
A. Eutrophication
B. Stratification
c. Guttation
D. None of the above
12
28173. Carbon monoxide is a pollutant as it:
(a) Inactivates nerves
(b) inhibits glycolysis
(c) combines with oxygen
(d) combines with haemoglobin
12
28230. Ozone layer of stratosphere required protectio
indiscriminate use of
(a) Balloons
(b) Pesticides
(c) Aerosols and high flying jets
(d) Atomic explosions
12
283Global Warming Clauses
An increase in the sea level
II. The melting of ice at mountain peaks
III. A decrease in food production by
plants
A. I only
B. I and II
c. II and III
D. I,II and III
12
284The process of accumulating higher and higher amounts of a toxic material such as PCBs within the body of any animal is called
A. Bioaccumulation
B. Biological amplification
c. Biological half-life
D. None of the above
12
285A scrubber in the exhaust of a chemical
industrial plant removes
A. Gases like Sulphur dioxide
B. Particulate matter of the size 5 micrometers or above
c. Gases like ozone or methane
D. Gases like Nitrous oxide
12
286Ozone is present as a chief constituent in which region of the atmosphere?
A. Troposphere
B. Stratosphere
c. Mesosphere
D. Thermosphere
12
287Name a chemical which removes ( C O_{2} )
from the air.
12
288Match the following
1
Eutrophication
I. Rise in sea level
2
II. Water hyacinth Biomagnification
III. Increase of quantity of
3. Terror of Bengal pollutant at successive trophic levels
4. Green house ( quad ) IV. Enrichment with nutrients effect
( A cdot 1-1 V, 2-111,3-1,4-11 )
B. 1- -।, 2- ||, 3- |II, 4- IV
c. ( 1- ) ॥, ( 2- ) ॥ᅵ, ( 3-1 V, 4-1 )
D. 1- -IV, 2- |II, 3- ||, 4-1
12
289The important water pollutants are:
A) Inorganic compounds
B) Organic compounds C) Fluorides
( A cdot A & B )
B. B & ( c )
( c cdot A & C )
D. ( A, B & C )
12
29036. Sewage water is purified by
(a) Aquatic plants (b) Fishes
(c) Light
(d) Microorganisms
12
291Cyclone collectors and electrostatic
precipitators are meant for controlling.
A. Sewage pollution
B. Air pollution
c. Pesticide pollution
D. Natural pollution
12
292Which one of the following is mainly responsible for depletion of ozone layer?
A. Methane
B. Carbon dioxide
c. water
D. Chlorofluorocarbons
12
293Excess atmospheric ( C O_{2} ) increases
green house effect as ( C O_{2} )
A. Is opaque to infra-red rays
B. Is not opaque to infra-red rays
c. Precipitates dust in the atmosphere
D. Reduces atmospheric pressure
12
29474. Ozone hole is maximum over
(a) Europe
(b) Africa
(c) India
(d) Antarctica
12
295Which of the following bind the soil together?
A. Trees
B. Pond
c. River
D. Layers of the soil
12
296Why does the increased level of
nutrients in the water affect the
survival of aquatic organisms?
12
297( ln 2015 ) and ( 2017, ) there was very heavy rain in our state. In 2016 , there was no adequate rain. These extreme conditions are due to
A. Uneven distribution of human population
B. Global warming
c. Depletion of ground water
D. Ozone depletion
12
298107. Which of the following statements is false?
(a) Over Antarctica, the depletion of ozone layer is due
to the formation of chlorine nitrate.
(b) Both O, and NO, react with unburnt hydrocarbons
in the polluted air to give PAN.
(c) Classical smog consists of a mixture of smog, fog
and sulphur dioxide.
(d) Gaseous pollutants consist of oxide of carbon,
sulphur and nitrogen along with dust, fumes smoke,
smog etc.
12
299Consider statements a-c about
pollution.
(a) To control air pollution all Delhi buses were asked to run on unleaded
petrol by the end of 2002
(b) Electrostatic precipitator can
remove ( 99 % ) of particulate matter from
thermal power plant exhaust.
(c) It is possible to estimate amount of organic matter in sewage water by measuring BOD. Of the statements.
( A cdot b ) and ( c ) correct
B. a alone correct
c. b alone correct
D. c alone correct
E. a and b correct
12
300Use of pesticides decreases water
pollution
A. True
B. False
12
30146. Of the following man-made disas-
ters, which is socially induced ?
(1) Debris Avalanche
(2) Salt Water Intrusion
(3) Arson
(4) Ozone depletion
12
302Ultra-violet light causes
A. Formation of pyrimidines dimers
B. Sticky metaphases
C. Photodynamic action
D. Destruction of hydrogen bonds between complementary DNA strands
12
303PUC certificate stands for
A. Pollution Under Control Certificate
B. Population Under Control Certificate
C. Population Under Coordinate Certificate
D. All of the above
12
304Control of automobile air pollution can be done by all except:
A. use of biopetrol
B. periodic check up of pollution control for all vehicles
c. use of low sulphur diesel or CNG
D. prefering individual vehicles.
12
30530. Sewage mostly constitutes
(a) Effluents
(b) Biodegradable pollutants
(c) Non-biodegradable pollutants
(d) Air pollutants
12
306Pyrogallol is used in gas analysis
because its
A. Alkaline solution absorbs oxygen
B. Acidic solution absorbs oxygen
C. Alkaline solution reacts with carbon dioxide
D. Acidic solution absorbs nitrogen
12
307BOD stands for
A. Biological oxygen demand
B. Chemical oxygen demand
C . Bio degradation
D. Biotic community
12
308Loss of upper fertile layer of soil is known as
A. Pedogenesis
B. Podosolization
c. soil erosion
D. None of the above
12
309Greenhouse effect corresponds to
A. Water pollution
B. Global warming
( mathbf{C} cdot S O_{2} ) poisoning
D. Production of green manure
12
310Incomplete burning of petrol or diesel in
vehicles creates ……….. gas which is very poisonous.
A. Carbon dioxide
B. Carbon monoxide
c. Methane
D. Ozone
12
311Which of the following cause green house effect?
(i) Deforestation
(ii) Emission of gases from factories
(iii) Melting of polar ice
A. Only (i) and (ii)
B. Only (i) and (iii)
c. only (ii) and (ii)
D. (i), (ii) and (iii)
12
312If there was no ( C O_{2} ) in the atmosphere
the earth’s temperature would be:
A. less than the present
B. same as present
c. higher than the present
D. dependent on ( O_{2} ) content of air
12
313Water blooms are formed by
A . Lemna
B. Hydrilla
c. water Hyacinth
D. Planktonic algae
12
314What are the causes of water pollution?
Discuss how can you contribute in
reducing the water pollution.
12
315Particulate and gaseous pollutants along with harmless gases are released from the thermal power plants. Name the most widely used device of removing particulate pollutants from the air.
A. Electrostatic precipitator
B. Fabric filters
c. cyclone separators
D. None of the above
12
316Assertion
The primitive atmosphere was reducing
one i.e., without oxygen.
Reason
In the primitive atmosphere, oxygen
was involved in forming ozone layer.
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.
12
317BOD of eutrophied lake will be
A . Lower
B. Moderate
c. Higher
D. Same as any other lake
12
318Given below is a diagram of electrostatic precipitator. Identify ( mathbf{A}, mathbf{B} )
( mathrm{C} ) and ( mathrm{D} ) and select the correct option.
A. A- Negatively charged wire, B- Negatively charged dust particles, C- – Discharge corona, D- collection
B. A- Negatively charged wire, B- Discharge corona, CCollection plate, D- Negatively charged dust particles
c. A- Positively charged wire, B- Positively charged dust particles, C- Discharge corona, D- -collection plate
D. A-Positively charged wire, B- Discharge corona, CCollection plate, D- Positively charged dust particles
12
319Release of phosphates and nitrates in water bodies (rivers and lakes) leads to
A. Increased algae growth
B. Increased growth of decomposers
c. Decreased nutrient content
D. Reduced algae growth
12
320Assertion : Agricultural output increased several times after introduction of DDT.
Reason: DDT was the first insecticide use
d on a wide scale.
A. If both the assertion and the reason are true and the
reason is a correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false
E. If the assertion is false but reason is true
12
321218. Sewage containing organic waste should not be disposed
in water bodies because it causes major water pollution.
Fishes in such a polluted water die because of
(a) large number of mosquitoes
(b) increase in the amount of dissolved oxygen
(c) decrease in the amount of dissolved oxygen in water
(d) clogging of gills by mud
12
322Discuss the causes and effects of
global warming. What measure need to be taken to control global warming?
12
323Compressed Natural Gas (CNG) is
A. Propane
B. Methane
c. Ethane
D. Butane
12
324Value based questions.
Why does ozone hole form over
Antarctica?
12
325Assertion:Presently, the global atmosphe
re is warming up.

Reason :The depletion of stratospheric oz
one layer has resulted in increase in ultra
violet radiations reaching the earth.
A. If both the assertion and the reason are true and the
reason is a correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false
E. If the assertion is false but reason is true

12
326The prime contaminants in the lakes undergone eutrophication by sewage and agricultural wastes are
A. Sulphates and phosphates
B. Nitrates and sulphates
c. Nitrates and phosphates
D. Nitrates and carbonates
12
327To prevent soil erosion, a farmer plants a hedge across a field. This method
works because
A. The hedge prevents the soil from direct impact of rainwater.
B. The roots of plants prevent the soil erosion.
c. The hedge absorbs minerals from the soil, which makes it most compact.
D. None of the above
12
328In our country, large patches of forests are being cleared for cultivation of
crops. The environmental impact of such a practice will lead to
A. Soil erosion
B. Soil conservation
c. soil pollution
D. Soil fertility
12
329A lake near a village suffered heavy mortally of fishes within a few days. Consider the following reasons for this.
(A) Lots of urea and phosphate fertilizers were used in the crops in the vicinity.
(B) The area was sprayed with DDT by an aircraft.
(C) The lake water turned green and stinky
(D) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis. Which two of the above were the main
causes of fish mortality in the lake?
( A cdot(A),(C) )
B. (A), (B)
( c cdot(B),(C) )
D. (c), (D)
12
330Give two ways in which we can all helps to reduce global warming. Write a catchy slogan to create awareness about it.12
331What is hybrid vehicle technology? Expalin is advantages with a suitable example?12
332174. Modes of controlling pollution in large cities includes:
(a) cleanliness and less use of insecticides
(b) proper disposal of organic wastes, sewage and
industrial effluents.
(c) use of liquefied carbon dioxide with a suitable
detergent in place of tetrachloroethene for dry
cleaning
(d) all the above
12
333During secondary treatment of primary effluent, how does significant decrease
in BOD occur?
12
334Environment is warmed up by
A. water vapour
B. Methane
( c cdot C O_{2} )
D. All of the above
12
335State the cause of accelerated
eutrophication
12
336A lake near village suffered heavy mortality of fishes within a few days. Consider the following reasons for this.
(i) Lots of urea and phosphate fertiliser were used in the crops in the vicinity.
(ii) The area was sprayed with DDT by an aircraft.
(iii) The lake turned green and stinky.
(iv) Phytoplankton population in the lake declined initially thereby greatly reducing photosynthesis. Which two of the above were the main
causes of fish mortality in the lake?
A . (i), (ii)
B. (ii), (iii)
( c . ) (iii), (iv)
D. (i), (iii)
12
337Which gas contributes most of green house effect?
A. сFC
B. Freon
( c cdot C O_{2} )
D. ( C H_{4} )
12
338How can soil erosion by river floods be controlled?
A. By making canals
B. By pumping water from river
c. By constructing dams across the rivers
D. By letting water flow freely at high speed
12
339Ozone exists in earth stratosphere and is responsible for protecting humans from harmful
A . clouds
B. rains
c. ultraviolet rays
D. all of the above
12
340Eutrophication may be due to
A. Runoff from agriculture
B. Pollution from septic systems
C . Sewage sludge spreading
D. All of the above
12
34185. Ozone layer of upper atmosphere is being destroyed by:
(a) chlorofluorocarbon
(b) SO,
(c) photochemical oxidants/O, and CO2
(d) smog
12
342Air pollution can be
A. Gasesous
B. Particulate type
C. Both A and B
D. None of these
12
343Which weed is known as terror of
Bengal? Why it is very difficult to get rid of them form water bodies?
12
34480. DDT is
(a) a fertilizer
(b) biodegradable pollutant
(C) greenhouse gas
(d) non-biodegradable pollutant
12
345Which of the following statement/s is/are correct with regard to ozone depletion:
1. The ozone hole is measured in terms
of ozone concentrations, which is
expressed in Dobson units.
2. The major cause for ozone depletion is the presence of CFCs in the stratosphere – CFCs are entirely manmade and not found naturally.
A. only
B. Only 2
c. Both A and B
D. None of the above
12
346During heavy rains in a village, the rainwater carried away an excess of nitrogenous compound present in the soil to a pond. The growth of algae and phytoplankton in the pond
A. Decreases
B. Decreases but attain normal level after sometime
c. Increases causing bloom
D. Remains unchanged
12
347Electrostatic precipitators (ESP) are used to control
A. pesticide pollution
B. air pollution
c. radioactive pollution
D. water pollution
12
34875. Depletion of ozone layer over Antarctica takes place
during
(a) November, i.e., after spring
(b) spring (in the months of September and October)
(c) winter
(d) summer
12
349Evidence of eutrophication of water indicates
A. Reduced oxygen demand
B. Rapid decomposition of organic matter
c. Algal bloom
D. Red tide
12
350Spectroscopy useful for gas analysis is
A. Absorption spectroscopy
B. Infra-red spectroscopy
c. Emission spectroscopy
D. Nuclear magnetic resonance spectroscopy
12
351What are the disadvantages of global warming?12
352Checking re-radiation of heat reflected
by earth by ( mathrm{CH}_{4}, mathrm{CO}_{2}, mathrm{O}_{3} ) and
chlorofluorocarbons is called as
A. Green house effect
B. Bohr’s effect
c. Pasteur’s effect
D. cosmozoic effect
12
353Eutrophication leads to death of fish
due to
A. Increased ( O_{2} ) concentration
B. Decreased ( O_{2} ) concentration
c. Increased algal contents
D. Decreased algal contents
12
354Given is a representation of a type of pollution. Study the picture and answer the question. Write one measure to reduce this
pollution.
12
355Catalytic converters, which are fitted into automobiles for reducing the emission of poisonous gases possess which of the following metals as catalyst?
A. Platinum-Palladium
B. Rhodium
c. Lead
D. Both (a) and (b)
12
356What initiatives were taken for
reducing vehicular air pollution in Delhi? Has air quality improved in Delhi?
12
357The gases which absorb most of IR (infrared) rays are
( A cdot mathrm{s} mathrm{O}_{2}, mathrm{CO}_{2}, ) and ( mathrm{NO}_{2} )
B. ( mathrm{SO}_{2}, mathrm{CH}_{4}, ) and ( mathrm{O}_{3} )
( mathrm{c} cdot mathrm{co}_{2}, mathrm{CH}_{4}, ) and ( mathrm{cFCs} )
D. ( mathrm{NO}_{2}, mathrm{CO}_{2}, ) and ( mathrm{O}_{3} )
12
358At DO below ( 4 mathrm{mg} / l, ) water at normal temperature is considered as
A. Heavily polluted
B. Moderately polluted
c. Little polluted
D. Nearly pure
12
359One of the causes of water pollution is that the farmers use excessive:
A. manure and water
B. fertilizers and pesticides
c. fertilizers and seeds
D. pesticides and seeds
12
360Peak concentration of ozone occurs in
the atmosphere above a height of
( A cdot 10 mathrm{km} )
B. 15 km
c. ( 17 mathrm{km} )
D. 25 km
12
361The use of chemicals like CFCs has
endangered the …….. layer.
12
362198. Which of the following does not contribute to water
pollution?
(a) Pathogens
(b) Organic wastes
(c) chemical pollutants (d) none of these
12
363If a non-degradable and fat soluble pollutant, such as DDT enters the food
chain, the pollutant
A. Magnifies in concentraition at each tropic level
B. Degrades at first trophic level
c. Accumulates in the body fat of organism at first trophic level and does not pass to second trophic level
D. Decreases inconcentration at each trophic level
12
364Catalytic converters are fitted into automobiles to reduce emission of
harmful gases. Catalytic converters change unburnt hydrocarbons into
A. Carbon dioxide and Water
B. Carbon monooxide
c. Methane
D. Carbon dioxide and Methane
12
365229. Minamata disease is due to pollution of
(a) arsenic into the atmosphere
(b) Organic waste into drinking water
(c) Oil spill in water
(d) Industrial waste Hg into fishing water
12
366Chernobyl nuclear tragedy occurred in
A. April, 1986
B. August 6, 1945
c. August 9,1945
D. December 3, 1984
12
367Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from
A. Petroleum industry
B. Sugar industry
c. Domestic sewage
D. Dairy industry
12
368DDT residues are rapidly passed through food chain as DDT is
A. water solubl
B. Moderately toxic
c. Liposoluble
D. Nontoxic to aquatic animals
12
369Which one of the following is mainly responsible for green house effect?
( A cdot S O_{2} )
в. ( C O_{2} )
c. ( C O )
D. ( O_{2} )
12
370In recent year, there has been a growing
concern about the gradually increasing average global temperatures. If this trend continues, would you expert the distributional range of some species to be affected?
12
371Depletion of ozone layer is noticed on
A. America
B. Asia
C. Australia
D. All over the earth
12
372Natural aging of a lake by nutrient enrichment of its water
A. Eutrophication
B. Carrying capacity
c. Photophosphorylation
D. None of the above
12
373Measuring’Biochemical Oxygen
Demand’ is used for
A. Estimating the amount of organic matter in sewage water.
B. Working out the efficiency of oil driven automobile engines.
C. Measuring the activity of Saccharomyces cerevisiae in producing curd on a commercial scale.
D. Working out the efficiency of R.B.Cs. about their capacity to carry oxygen.
12
374Eutrophication is often seen in
A. Mountains
B. Deserts
c. Fresh water lakes
D. Ocean
12
375Eutrophication is caused by
A. Acid rain
B. Nitrates and phosphates
c. Sulphates and carbonates
D. ( C O_{2} ) and ( c 0 )
12
376An article in the newspaper reports that ‘Refrigerants like Chloroflurocarbons (CFCs) pose threat to the environment’.
How CFCs are harmful to the
environment?
12
377CFC are not recommended to be used
in refrigerators because they
A. Increase temperature
B. Deplete ozone
c. Affect environment
D. Affect human body
12
378Algal blooms impart a distinct colour to
water due to
A. Their pigments
B. Excretion of coloured substances
C. Formation of coloured chemicals in water facilitated
by physiological degradation of algae
D. Absorption of light by algal cell wall
12
379Which of the following prevents soil erosion?
A. Animals
B. Rocks
c. Plants
D. Mountains
12
380limit of BOD prescribed by Central
Pollution Control Board for discharge of industrial and municipal waste waters into natural surface waters is
A. ( <3.0 ) ppm
в. ( <10 ) ррт
c. ( <30 ) ppm
D. < 100 ppm
12
381Describe this topic:
Effect of sewage discharge on some important characteristics of a river
12
382Which of the following chemical cause
the thinning of layer P?
A. Carbon monoxide
B. sulphur dioxide
c. chlorofluorocarbons
D. Both A and C
12
383Eutrophication is related to
A. Water pollution
B. Air pollution
c. Land pollution
D. Cultural pollution
12
384Chipko movement in the year 1974 in
Garhwal Himalayas involved
A. Protecting tigers
B. Preventing soil erosion by planting trees
C. Preventing pollution by closing down industries
D. Hugging trees to prevent the contractors from felling them
12
385168. Fishes die in water bodies polluted by sewage due to:
(a) pathogens
(b) clogging of gills by silt
(c) reduction in oxygen
(d) foul smell
12
386The harmful and unwanted substances
which degrade the quality of water are called as
A. water pollutants
B. soil pollutants
c. air pollutants
D. none of the above
12
387180. The extensive use of CFCs as refrigerant fluids and in
aerosol is because of:
(a) its high chemical stability
(b) good absorber of UV radiation
(c) its polar nature
(d) high toxicity
12
388Causes of air pollution are:
i. Exhaust from automobiles
ii. Exhaust from factories and power
plant
iii. CFCs
iv. Polythene
( A ). i, ii, ii i
B. ii, iii, iv
c. iii, iv,
D. i, ii in
12
389Part of ozone is destroyed over poles during
A. Polar spring
B. Winter
c. Summer
D. Period of snow fall
12
390Drinking mineral water/aerated drink with low levels ( (sim 0.02 ) ppm ) of pesticide for long period would
A. Cause cancer of intestine
B. Pesticide accumulation in the body
c. Cause leukaemia
D. Produce immunity against mosquito
12
391165. Bhopal gas tragedy in carbide factory was due to leakage
of
(a) methyl isocyanate (b) methyl isocyanide
(c) ammonia
(d) carbamate
12
392How would short-term advantages differ from the advantages of using a longterm perspective in managing our resources?12
393235. Formation of ozone in the upper atmosphere
oxygen takes place by the action of
(a) Nitrogen oxides (b) Ultraviolet rays
(c) Cosmic rays (d) Free radicals
12
394Answer in 200 to 250 words:
Write a brief account of functioning of ‘Electrostatic Precipitator’ with diagram.
12
395Green-house gases are
A. Absorbers of long wave radiations from earth.
B. Transparent to both solar radiation and long wave radiation from earth.
C. Absorbers of solar radiation for warming the atmosphere of earth.
D. Transparent to emissions from earth for passage into
outer space.
12
39634. Which causes death of fish in water bodies polluted by
sewage?
(a) Decreases in DO
(b) Pathogens
(c) Clogging of gills by silt
(d) Foul smell
12
397Global warming will cause.
A. Rise is level of oceans
B. Decrease in glaciers
c. Reduction in ice caps
D. All the above
12
398Relationship between DO and BOD is
that they
A. Are directly proportional
B. Are inversely proportional
c. Are not related
D. Always remain equal to each other
12
399When the level of contaminants in air
becomes so much that air becomes
harmful for living beings, it is called
A . air pollution
B. water pollution
c. noise Pollution
D. all of the above
12
400Eutrophication can be observed in
A. Saline soil
B. Desert
c. Fresh water lakes
D. Agricultural fields
12
40135. Which of the following statements is true about ozone
layer?
(a) It is harmful because ozone is dangerous to living
organism.
(b) It is beneficial because oxidation reaction can
proceed faster in the presence of ozone.
(c) It is beneficial because ozone cuts off the ultraviolet
radiation of the sun.
(d) It is harmful because ozone cuts out the important
radiation of the sun which are vital for photosynthesis.
12
402Which one of the following pair is
mismatched?
A. Nuclear power-radioactive wastes
B. Solar energy-greehouse effect
C. Fossil fuel burning- release of ( mathrm{CO}_{2} )
D. Biomass burning- release of ( mathrm{CO}_{2} )
12
40349. Which bacterial strain developed
from natural isolates by genetic
manipulations can be used for
treating oil spills ?
(1) Pseudomonas
(2) Agrobacterium
(3) Clostridium
(4) Nitrosomonas
12
404Biomagnification of DDT in a aquatic food chain starting from water having a concentration of 0.003 ppb may go, in fish eating birds, upto
A. 2 ppm
B. 25 ppm
c. 50 ppm
D. 100 ppm
12
405More soil erosion occurs where there is
A. No rainfall
B. Low rainfall
C. High rainfail
D. None of the above
12
406Which among the following are the consequences of ozone depletion?
A. Entry of UV-rays in earth’s atmosphere
B. Various skin troubles like skin cancer
c. cataract
D. All of the above
12
407Photocatalysis of effluents is carried out with the help of
A. Polymeric adsorbents
B. Titanium dioxide
c. Resins
D. UV radiations
12
408According to WHO, the soft water has 0 to ( _{–}–_{-} ) milligram per litre as
( boldsymbol{C a C O}_{3} )
A . 60
B. 120
c. 180
D. 150
12
409Which of the following is not a good practice to conserve fuel?
A. Using public transport system
B. Using motor bike to travel short distances
c. using bicycle to travel short distances
D. Walking the short distances
12
410106. Consider the following statements about water
pollutants.
(1) Disease causing pollutants are called pathogens.
(II) They are bacteria and other organisms that enter
water from domestic sewage and animal excreta.
(III) Gastrointestinal diseases are caused by Streptococcus
faecalis and Escherichia coli bacteria present in
human excreta.
Correct option(s) is/are
(a) Only III
(b) Both II and III
(c) Both I and II (d) I, II and III
12
411Eutrophication is
A. Excessive oxygen in ponds
B. Abundant fertilizers in the lake
C. The lack of algae in the lake
D. Abundant nektons in the lake
12
412The reason for global warming is
A. Long wavelength radiation are absorbed by the atmosphere
B. Short wavelength radiation are absorbed by the atmosphere
C. Atmosphere traps radiations to increase the temperature
D. UV and infra red radiations
12
413Green house effect is increase in
temperature of earth due to
A. High concentration of ( N O_{2} )
B. High concentration of ( S O_{2} )
C. High concentration of ( C O_{2} )
D. High concentration of ( c 0 )
12
414It is said that Taj is getting destroyed
due to
A. Flood in Yamuna river
B. Decomposition of marble as a result of high temperature
c. Air pollutant released from oil refinery of Mathura
D. All of the above
12
415According to origin, identify the secondary air pollutant.
( A cdot S O_{2} )
B. Ash
c. Ozone
D. Radioactive compound
12
41618. Ozone depletion in stratosphere shall result in:
(a) forest fires
(b) increased incidence of skin burns and skin cancer
(c) increase in biological oxygen demand
(d) global warming
12
417BOD (biological oxygen demand) is
A. Amount of oxygen consumed by microorganisms for decaying organic matter per unit volume of water
B. Amount of ( C O_{2} ) consumed by microorganisms per
unit of sewage water
C. Amount of oxygen required by aquatic plants for survival
D. None of the above
12
418A lake with an inflow of domestic
sewage, rich in organic waste, may result in
A. Drying of the lake very soon due to algal bloom
B. An increased production of fish due to lot of nutrients
c. Death of fish due to lack of oxygen
D. Increased population of aquatic web organisms
12
419Eutrophication of water bodies leading to killing of fishes is mainly due to nonavailability of
A. Food
B. Light
c. Essential minerals
D. oxygen
12
420( O_{3} ) in ozone layer is formed by action of
A. IR radiation
B. Blue radiation
c. uv radiation
D. Other radiations
12
421Which of the following is/are true regarding international standards of
drinking water?
A. Fluoride deficiency causes tooth decay.
B. Required fluoride concentration is 10 ppm
c. When fluoride concentration exceeds 20 ppm, brown mottling of teeth occurs.
D. Excess fluoride (over 100 ppm ) has serious effect on bones and teeth
12
422All of the following statements about
eutrophication is true except
A. It is caused by acid rain.
B. It is caused by the addition of nutrients to a water system.
C. It is most harmful when there is little flow through in the system.
D. Phosphorus is the main causal agent
E. Humans are responsible for most eutrophication.
12
423What is global warming?12
424What is green house effect? Why it is
named so?
12
425Arrange the following in the descending order of their role in soil erosion
(I) Wind erosion
(ii) Chemical degradation
(iii) Physical degradation
(iv) Water erosion
( mathbf{A} cdot mathbf{i v} rightarrow mathbf{i} rightarrow mathbf{i i} rightarrow ) iii
B. ( i v rightarrow i i rightarrow ) ii ( rightarrow i )
( mathrm{c} cdot mathrm{i} rightarrow mathrm{ii} rightarrow ) iii ( rightarrow ) iv
D. iv ( rightarrow ) ii ( rightarrow ) ii ( rightarrow ) i
12
426Thermal water pollution is caused due
to:
A. use of water as a coolant by power plants
B. use of water for sewage treatment
C. use of water as a disinfectant
D. use of water as washing source
12
427How do nitric oxide molecules cause
ozone depletion?
12
428When harmful substances such as
sewage, toxic chemicals get mixed with
water, then:
A. the water becomes more pure
B. the water get polluted
c. the water becomes clean and clear
D. none of these
12
429Water hyacinth is termed as ‘terror of
Bengal’. It causes death of fish because
it
A. Covers water surface and inhibits sunlight to pass through
B. Drains oxygen from water that causes oxygen deficiency
c. Absorbs nutrients from water that causes malnutrition
D. Releases ( C O_{2} ) in huge amount which is lethal to fish
12
430Ammonia is an inorganic water pollutant.
A. True
B. False
12
431Global warming is a direct result of:
A. an increased imbalance of gases in the atmosphere.
B. a decreased imbalance of gases in the atmosphere.
C. an increased balance of gases in the atmosphere.
D. none of these
12
432is the ecosystem’s response to the addition of artificial or natural
nutrients in water bodies.
A. Condensation
B. Eutrophication
c. Dispersion
D. Diffusion
12
433Social forestry is
A. Planting of different kinds of trees in the same area
B. Greening of hills with the efforts of common men
C. Raising trees on common village lands and other vacant areas of fodder, minor timber and fire wood
D. None of the above
12
434( C O_{2} ) acts as a greenhouse gas because
A. It is transparent to heat but traps sunlight
B. It is transparent to sunlight but traps heatt
c. It is transparent to both sunlight and heat.
D. It traps both sunlight and heatt
12
435Carbon dioxide is called a “greenhouse”
gas, because
A. It is involved in photosynthesis
B. It emits light
c. It traps infrared radiations
D. It traps ultraviolet radiations
12
436B.O.D. is connected with
A . Organic matter
B. Microbes
C. Microbes and organic matter
D. None of the above
12
437Which of the following does not contributes to greenhouse effect?
A. Carbon dioxide
B. Carbon monoxide
c. chloro-fluoro carbon and Methane
D. Refrigerant freon
12
438The soil which is transported by wind is known as
A . Colluvial
B. Eolian
c. Alluvial
D. Glacial soil
12
439Which of the following is not the function of forest?
A. It is used to make paper
B. Resin, gum and drugs are obtained.
c. controls flood.
D. Causes soil erosion.
12
440Biochemical Oxygen Demand measures:
A. industrial pollution
B. air pollution
C . pollution capacity of effects
D. dissolved ( O_{2} ) needed by microbes to decompose organic waste.
12
441Leucaena a fast growing tree has been
selected as a fuel yielding tree under the social forestry program in the rural area of our country. What is the common name of this tree?
A . Babul
B. Subabul
c. Jojoba
D. None of the above
12
442Greenhouse effect refers to
A. Cooling of Earth
B. Trapping of UV rays
C. Production of cereals
D. Warming of Earth
12
443Run off components of fertilizers rich fields causes
A. Turbidity of water bodies
B. Eutrophication of water bodies
c. Precipertation of toxic chemical
D. Temperature variation in water
12
444Which class of carbon compounds are
responsible for the depletion of ozone
layer at the higher level of the atmosphere?
12
445Which of the following is associated with biological amplification?
( A cdot S O_{4} )
B. DDT
c. sewage
D. All of the above
12
446Which is the main causative factor of
desertification
A. Developmental activities
B. Tourism
c. overgrazing
D. Irrigated agriculture
12
447What is Global Warming? Write their main five reasons.12
448Assertion
Deforestation is one main factor
contributing to global warming.
Reason
Besides ( C O_{2}, ) two other gases, methane and CFCs, are also included under green
house gases.
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
12
449Inorganic fertilizers are applied each year to fields bordering a lake. The fertilizers run off into the lake and
cause the following six changes which together cause high mortality of fishes.
(i) Aerobic bacteria feed on dead
plants.
(ii) Algae reproduce faster
(iii) Light cannot penetrate the water.
(iv) Oxygen level falls.
(v) Water becomes green.
(vi) Plants under water die.
Which of the following shows the correct order of the changes taking place?
A ( cdot(text { iv }) rightarrow(v text { i) } rightarrow(i) rightarrow(text { ii }) rightarrow(v) rightarrow ) (iii)
B. (ii) ( rightarrow(v) rightarrow(text { iii) } rightarrow(v i) rightarrow(i) rightarrow ) (iv)
( c cdot(v) rightarrow(i i) rightarrow(text { iii) } rightarrow(v i) rightarrow(i) rightarrow(text { iv }) )
D. (ii) ( rightarrow(text { iii) } rightarrow(v) rightarrow(text { iv }) rightarrow(v text { i) } rightarrow(i) )
12
450Soil erosion is more where
A. Rainfall is high
B. No rainfall
C. Low rainfall
D. None of the above
12
451Q Type your question_
statement regarding this –
A. When agricultural fields are sprayed with DDT, it is carried by runoff water into nearby aquatic bodies
B. River water may have a very low concentration of DDT,
but the concentration of DDT, which is still suitable for
consumption by human beings
C. Increased concentration of DDT in birds affects
calcium metabolism due to which egg shells become thin and break before maturity
D. None of these
12
452C.O.D. stands for
A. Chemical oxygen demand
B. Control of diese
c. csiumoxide deposition
D. Cemistry of depositions
12
453Deforestation has an alarming effect on
A. Increase in grazing area
B. Weed control
c. Soil erosion
D. Sunlight
12
454What are the effects of air pollution?
i. greenhouse effect
ii. smog
iii. respiratory disease
¡v. acid rain
( mathbf{A} cdot mathbf{i}, mathbf{i} ; ) ii
B. ii, iii, iv
c. iii, iv,
D. i, ii, iii, iv
12
455Soil erosion is common in areas devoid
of vegetation cover.Why?
12
456Which of the following does not occur when the sewage is discharged into
water?
A . Increase in ( O_{2} )
B. Cyanophycean blooms occur
c. Depletion of ( O_{2} ) layers
D. Eutrophication
12
457The best solution to combat greenhouse
effect is
A. To use diesel vehicles
B. To stop infra-red from entering the earth
c. Afforestation and grow abundant plants
D. All of the above
12
458Eroded soils are
A. Devoid of plant nutrients
B. Richer in plant nutrients
C. Unaltered in plant nutrients
D. Fit for agriculture
12
459Protective layer of ozone in the atmosphere exists in which layer?
A. Troposphere
B. Lonosphere
c. Stratosphere
D. Atmosphere
12
460Which one of the following gases can deplete ozone layer in the upper atmosphere?
( A ). Ammonia
B. Methane
c. Carbon monoxide
D. None of the above
12
461The chief sources of water pollution can
be:
A. point sources
B. non-point sources
c. both A and B
D. none of above
12
462Depletion of ozone layer is mainly due to
A. Methane
B. Carbon dioxide
c. chloroflorocarbons
D. Nitrogen
12
463State the role of citizens in pollution control. Give three efforts taken in order
to reduce pollution.
12
464Which one of the following is the correct percentage of (the two out of
four) greenhouse gases that contribute to the total globa
warming?
A ( cdot mathrm{N}_{2} mathrm{O} 6 %, mathrm{CO}_{2} 86 % )
B. Methane 20%, N_0 18%%
c. СFC 14%, Methane 20%
D. ( operatorname{co}_{2} ) 40%, сFС ( 30 % )
12
465Which one of the following is mismatched?
A . Fossil fuel burning- Release of ( C O_{2} )
B. Nuclear power- Radioactive wastes
c. Solar energy- Green house effect
D. Biomass burning- Release of ( C O_{2} )
12
466High value of BOD (Biochemical Oxygen Demand) indicates
A. Water is less polluted
B. Consumption of organic matter in the water is higher by the microbes
c. water is pure
D. None of these
12
467(a) Name any two places where it is essential to install electrostatic
precipitators to do so?
(b) Mention one limitation of
electrostatic precipitator
12
468Explain biomagnification of DDT in an aquatic food chain. How does it affect the bird population?12
469Electrostatic precipitators are extensively employed to control
A. Water pollution
B. Air pollution
c. Radioactive pollution
D. None of the above
12
470What is green house effect? Write its two
control measures.
12
471Ozone layer of upper atmosphere is being destroyed by
A. chlorofluorocarbon
в. ( S O_{2} )
c. Photochemical oxidants/O ( _{2} ) and ( C O_{2} )
D. Smog
12
472BOD refers to
A. The amount of oxygen consumed if all the organic matter in ( 1000 mathrm{ml} ) of water were oxidized by bacteria
B. The amount of oxygen released when all the organic matter was consumed by bacteria in 1 litre of water
C. The oxygen required for bacteria to grow in 1 litre of effluent
D. The amount of oxygen released if all the organic matter in ( 1000 mathrm{ml} ) of water were oxidized by bacteria
12
473155. Eutrophication causes reduction in:
(a) dissolved hydrogen (b) dissolved oxygen
(c) dissolved salts (d) all the above
12
474Some of the major contaminants of
water are:
A. sewage
B. agricultural chemicals
c. industrial waste
D. all of the above
12
475Maximum DDT is present in birds feeding on
A. Fishes
B. Meat
c. Insects
D. Seeds
12
476Assertion
Heavy metals such as cadmium,
mercury, nickel etc. are water
pollutants.
Reason
Heavy metals are not harmful to
humans.
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
12
477Nuisance growth of aquatic plants and bloom forming algae in natural waters is generally due to high concentrations
of
A. Carbon
B. Sulphur
c. calcium
D. Phosphorus
12
478169. Which of the following statements is false?
(a) The industrial and domestic sewage discharge is the
main reason for river water pollution.
(b) Surface water contains a lot of organic matter and
mineral nutrients.
(c) Oil spill in sea water causes heavy damage to
fishery.
(d) Oil slick in sea water increases dissolved oxygen.
12
479Equipment used to minimize industrial
waste are
A. Electrostatic precipitators
B. Scrubbers
c. Tall chimney
D. All of the above
12
480Assertion
DDT shows biological magnification.
Reason

UV radiation causes ozone depletion.
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

12
481Sheet erosion is caused by
A. Sea
B. wind
c. Heavy rains
D. Glaciers
12
482Ozone hole enhances
A. UV radiations reaching earth
B. Number of cataracts
C. Skin cancers
D. All of the above
12
483The BOD of an eutrophied lake will be
A. Higher
B. Lower
c. Moderate
D. Same as any other lake
12
484The best solution to combat greenhouse
effect is
A. To use diesel vehicles
B. To stop infra-red from entering the earth
C. Afforestation and growing abundant plants
D. All of the above
12
485The ozone layer: Between 15 and ( 50 mathrm{km} )
above the earth is a thin layer of gas called ‘ozone’. It protects the earth from most of the sun’s harmful ultraviolet
radiation. Too much radiation
causes blindness in animals and skin
cancer in people. In ( 1985, ) scientists discovered a hole in the ozone layer in the Antartica. They have recently discovered a smaller hole over the
arctic. The ozone layer is also becoming thinner over other locations of the earth
too. Scientists believe that over the last
10 years about ( 30 % ) of the ozone layer has disappeared. This damage is caused by chemicals. Choose the right statement(s) from the following.
A. The greenhouse effect would be more efficient and the temperature of earth would increase.
B. CFCs would result in the depletion of the ozone layer
c. Infrared radiation from the sun would bombard earth
D. Ultraviolet radiation from the sun cannot enter earth
12
486Chlorofluorocarbons are not being used in refrigerators because they
A. Increase temperature
B. Cause allergic reactions
c. Deplete ozone
D. Both A and B
12
487Gases referred to as ‘green house gases’
are
( mathbf{A} cdot mathrm{CO}_{2}, mathrm{O}_{2}, mathrm{NO}_{2}, mathrm{NH}_{3} )
B. Chlorofluoro carbon, ( mathrm{CO}_{2}, mathrm{NH}_{3}, mathrm{N}_{2} )
( mathbf{C} cdot mathrm{CH}_{4}, mathrm{N}_{2}, mathrm{CO}_{2}, mathrm{NH}_{3} )
D. Chlorofluoro carbon, ( mathrm{CO}_{2}, mathrm{CH}_{4}, mathrm{NO}_{2} )
12
488Increase in the concentration of
pollutants (toxicant) in higher trophic levels is called as
A. Recycling
B. Eutrophication
c. Biodegradation
D. Biomagnification
12
489Producer gas is formed by passing over hot biomass.
A. Steam
B. Air
c. Hydrogen
D. Both A and B
12
490The biological amplification of DDT in the various trophic levels is known as.
A. Green house effect
B. Biomagnification
c. Eutrophication
D. Pollution
12
491102. Which of the following is false?
(a) Greenhouse gases are carbon dioxide, methane,
water vapours, nitrous oxide, CFCs and ozone.
(b) CO is highly poisonous to living beings because
of its ability to block the delivery of oxygen to the
organs and tissues.
(c) The troposphere contains dinitrogen, dioxygen,
ozone and little water.
(d) The primary source of air borne lead emission is
leaded petrol
12
492Soil erosion by wind brings about the serious damage in soil by changing
the
A. Soil permeability
B. Soil structure
c. Soil texture
D. Soil plasticity
12
493Eutrophication is caused by
A. Sewage and detergents
B. Petrochemical and fertilizer plant effluents
C. ( mathrm{NO}-13 ) and ( mathrm{SO}-24 ) present in acid rains
D. Mine effluents
12
494Natural sink of stratospheric ozone is?
A. Sulphuric dioxide
B. Sulphur fluxes of oceans
c. Freons
D. нсFсs
12
495Contribution of methane to global
warming is
A . ( 6 % )
B. 14%
c. 20%
D. 30%
12
496List at least three gaseous air pollutants that are emitted from automobiles and industries.12
497One green house gas contributes ( 14 % ) to total global warming and another contributes ( 6 % . ) These are respectively
identified as
A. ( N O_{2} ) and ( C O_{2} )
B. CFC and ( N_{2} ) O
c. Methane and ( C O_{2} )
D. Methane and CFCs
E. cres and ( C O_{2} )
12
498Match and find the correct option.
A. a-ii-s, b-iii-p, c-i-q, d-iv-r
( B )
( a-i i-p ) ( b-i-r, c-i v-q, d-i i i-s )
C ( cdot a-i-s, b-i i ) i-q, c-iv-p, d-ii-r
D. a-iv-r, b-ii-s, c-iii-p, d-i-q
12
499Checking of radiating heat by
atmospheric dust, ( 0_{3}, mathrm{CO}_{2} ) and water vapours is
A. Greenhouse effect
B. Solar effect
c. Ozone layer effect
D. Radioactive effect
12
500Which of the following chemical is released by chlorofluorocarbon that is harmful to ozone?
A. Fluorine
B. Sulphur dioxide
c. Nitrogen peroxide
D. Chlorine
12
501Nutrients are required for proper growth of producers in aquatic environment. Excess nutrient will cause
A. Over growth of producers
B. Depletion of ( 0_{2} )
c. Decrease in the number of nektons
D. All of the above
12
502Green house effect is related to
A. Increased growth of green algae
B. Global warming
C. Cultivation of vegetables in houses
D. Development of terrace gardens
12
503Pollution of water
due to agricultural operations can be minimized by using:
A . pesticides
B. fertilizers
c. all of the above
D. none of the above
12
504Increase in the concentration of the
toxicant at successive trophic levels is known as
A. Biogeochemical cycling
B. Biomagnification
c. Biodeterioration
D. Biotransformation
12
505limit of BOD prescribed by Central Pollution Control Board for the
discharge of industrial and municipal
waste waters into natural
surface waters, is –
( A .<3.0 mathrm{ppm} )
B. <10 ppm
( c .<100 mathrm{ppm} )
D. < 30 ppm
12
506Snow blindness is caused due to
A. Ozone hole
B. Nuclear winter
c. Acid rain
D. Green house effect
12
507How burning of fossil fuels leads to
increase in global warming?
12
508Green house effect is increasing due to
A . Increasing ( C O_{2} ) concentration
B. Increasing ( S O_{2} ) concentration
c. Increasing concentration of chlorofluorocarbons
D. Hole in ozone layer
12
509107. In cold water, DO (Dissolved Oxygen) can reach a
concentration up to X ppm whereas oxygen in air is
about Y ppm. X and Y are
X
(a) 10
20
(b) 10
2.0 x 105
(c) 10
2.0 x 104
(d) 20
10
12
510Highest DDT deposition shall occur in
A. Phytoplankton
B. Sea Gull/Birds
( c cdot ) crab
D. Eel
12
51121. The reaction caused by UV radiations from sun produces
(a) Carbon monoxide (b) Ozone
(c) Sulphur dioxide (d) Fluoride
12
512According to the recent reports, the country contributed maximum to hole
formation in ozone layer is
A. U.S.A.
B. Russia
c. Germany
D. Japan
12
513Which one of the following statements
is correct?
A. At present it is not possible to grow maize without chemical fertilizers.
B. Extensive use of chemical fertilizer may lead to eutrophication of nearby water bodies.
C. Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants.
D. Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in the soil.
12
514BOD is related to
A. organic pollutants
B. Detergents
c. Putrescibility
D. Inorganic pollutants
12
515The phosphorus rich fertilizer obtained
from sea birds along the coast of Chile and Peru, is
A. Guano
B. Bone meal
c. Dung
D. urea
12
516Why ozone is known as ‘chemical weed
( ? )
A. Because it is formed by chemical reactions
B. Because it is harmful as well useful
C. Because it is harmful, just like weeds for mankind
D. Ozone is not designated as chemical weed
12
517Match column -I with column-II and
select the correct answer using the codes given below:
Column-I Colum –
( | )
(A) Global warming Eutrophication
(B) Algal bloom
( (q) C O )
( mathbf{C O}_{mathbf{2}} )
(C) Nitrogen fixation Rhizobium
(D) Pseudomonas
(s) Fossil
Fuel
(E) Non-renewable resource
Denitrification
( A cdot(A)-p,(B)-q,(C)-r,(D)-t,(E)-s )
B. (A)- q, (B)- ( p,(C)-r,(D)-t,(E)-s )
C. ( (A)-q,(B)-p,(C)-r,(D)-s,(E)-s )
D. ( (A)-q,(B)-p,(C)-s,(D)-r,(E)-t )
12
518The term greenhouse effect was given by
A. Fourier
B. Tyndall
c. Arrhenius
D. Linnaeus
12
519Which one of the following diseases is caused due to ozone depletion on
human?
A. Huntington’s chorea
B. Small pox
c. Plague
D. Erythemia
12
520203. Acid rain is harmful for
(a) agriculture
(b) aquatic ecosystem
(c) buildings made of marble or metal
(d) All of these
12
521Biomagnification of DDT in aquatic food
chain from 0.003 ppb in water to fish eating birds would be
A. 100 ppm
B. 50 ppm
c. 25 ppm
D. 2 ppm
12
522Ozone depletion is occuring widely in the stratosphere, it leads to ozone hole
caused mainly due to
A. Ethylene
B. Methane
c. сесь
D. ( C O_{2} )
12
523If the smog density of an area increases, it indicates
A. Increase in agricultural waste
B. Increase in noise pollution
c. Vehicles of area is not under PUC norms
D. None of the above
12
524Which of the following is responsible for the ( 80 % ) depreciation in the ozone layer?
A. Chloroflurocarbon
B. Chloride ion
c. sulphur ion
D. Magnesium ion
12
525Why is it said animals are a cause for
soil erosion?
A. As they walk on it
B. As they freely graze and spoil the soil by their hoofs
c. As they spoil the soil by grazing itself
D. None of the above
12
526The leaching of chemical fertilizers into
rivers and ponds causes:
A. the rapid growth of algae
B. air pollution
c. an increase in the oxygen concentration of the water
D. an increase in number of aquatic organisms
12
52744. The Particulate Matter (PM-10)
exhaled from the polluted atmo-
sphere is often filtered out dur-
ing the process of
(1) Coughing (2) Sneezing
(3) A and B (4) Urination
12
528What are earth heating gases?12
529Assertion
Methane, component of green house gases, contributing to global warming
is about 20 percent.
Reason
Introduction of multi-point fuel
injection engines in automobiles has decreased methane content in the
exhausts.
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.
12
530Measurement of rate of oxygen utilisation by a unit volume of water over a period of time is to measure
A. Biochemical oxygen demand
B. Biosynthetic pathway
c. Biogas generation
D. Fermentation
12
531BOD is measure of.
A. Industrial waste being poured in water body
B. Extent of pollution with organic compounds
C. ( mathrm{CO} ) combined with haemoglobin
D. ( O_{2} ) required by green plants during night
12
532List out the major air pollutants.12
533BOD stands for
A. Biological organism death
B. Biochemical organic matter decay
C. Biotic oxidation demand
D. Biochemical oxygen demand
12
534Read the following about pollution and
identify the correct matching combinations.
( begin{array}{lll}text { List I } & text { List II } & text { List III } \ text { (A) Chernobyl } & begin{array}{l}text { Accidental } \ text { leakage }end{array} & begin{array}{l}text { Radioactive } \ text { wastes }end{array} \ begin{array}{l}text { (B) Elnino } \ text { effect }end{array} & begin{array}{l}text { Global } \ text { warming }end{array} & begin{array}{l}text { Causing } \ text { climatic } \ text { change }end{array} \ begin{array}{l}text { (C) } \ text { Chlorofloro } \ text { carbons }end{array} & begin{array}{l}text { Ozone } \ text { degradation }end{array} & begin{array}{l}text { Fluorine } \ text { atoms } \ text { released }end{array} \ begin{array}{l}text { (D)Snow } \ text { blindness }end{array} & begin{array}{l}text { UV-B } \ text { Radiation }end{array} & begin{array}{l}text { Inflammation } \ text { of cornea }end{array}end{array} )
( A cdot A, C )
B. A, D
( c cdot A, B, D )
D. B.
12
535DDT concentration recorded in human
body has been
в. ( 1.3-3.1 ) ppm
c. ( 13-31 ) ppm
D. ( 30-70 ) ppm
12
536List any three human activities which
would lead to an increase in the carbon
dioxide content of air.
12
537Number of ozone depleters identified by Viena convention for Protection of Ozone
Layer (1992) is
A . 19
B . 17
c. 15
D. 13
12
53899. The region containing water vapour is
(a) Thermosphere (b) Stratosphere
(c) Mesosphere (d) Troposphere
12
539A large quantity of urban sewage is drained into nearby village river. Which among the given conditions would happen after mixing of sewage into the river?
(i) Biochemical oxygen demand (BOD) of receiving water body increases.
(ii) Dissolved oxygen of receiving water body decreases.
(iii) It will not cause mortality among fishes and other aquatic creatures.
(iv) It will lead to the nutrient
enrichment of receiving water body.
A ( cdot ) (i), (ii) and (iii)
B. (i), (ii) and (iv)
C. (ii) and (iii) only
D. (iii) and (iv) only
12
540Use of ( _{text {十一一一一一一一 }} ) in agricultural activities has grown quite a lot hazardous ammonia gases in the atmosphere.
A . insecticides
B. pesticides
c. fertilizers
D. all of the above
12
541Occurrence of water blooms in a lake
indicates
A. Excessive nutrient availability
B. Nutrient defciency
c. Oxygen defciency
D. Absence of herbivores
12
54246. BOD, a measure of organic im-
purities stands for :
(1) Biodegradable oxygen de-
mand
(2) Bioresistant oxygen demand
(3) Biological oxygen demand
(4) Biochemical oxygen demand
12
543Deforestation causes
A. Soil erosion
B. Soil pollution
c. water pollution
D. Noise pollution
12
544Cyclone collector is used for minimizing
A. Radioactive pollution
B. Air pollution
c. Noise pollution
D. water pollution
12
545Drinking aerated drink with low levels
(0.02 ppm) of pesticide for long period would cause
A. cancer of intestine
B. Accumulation in the body
c. Leukaemia
D. Immunity against mosquito
12
546Water pollution is due to:
A. agricultural discharges
B. sewage and other wastes
C. industrial effluents
D. all of the above
12
547Drinking of mineral water with very low level of pesticides (about 0.02 ppm) for long periods may
A. Produce immunity against mosquito.
B. Cause leukemia (blood cancer) in most people.
c. Cause cancer of the intestine
D. Lead to accumulation of pesticide residues in body fat
12
548Assertion
Excess nitrate in drinking water causes
blue baby’ syndrome.
Reason
The maximum limit of nitrate in
drinking water is 50 ppb.
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
12
549Which one of the following is responsible for causing skin cancer and mutation?
A. Ozone depletion
B. Smog formation
c. snowfall
D. Smoke from aeroplane
12
550Gases mainly responsible for the greenhouse effect are
A. ( C O_{2} ) and ( c 0 )
B. ( operatorname{coand} H_{2} )
c. ( C O_{2} ) and ( N_{2} O )
D. ( C O_{2} ) and ( S O_{2} )
12
55155. Co-existence of biotic and abiotic components of
the environment along with climatic factors such as
temperature, humidity, etc., is called
(a) eutrophication (b) atmosphere
(c) ecosystem
(d) halomorphism
12
552When domestic sewage mixes with
river water,
A. Small animals like rats will die after drinking river water
B. The increased microbial activity released micronutrients such as iron
C. The increased microbial activity uses up dissolved oxygen
D. The river water is still suitable for drinking as impurities are only about ( 0.1 % )
12
553Which of the following phenomena take place when the top layer of soil is exposed?
A. Soil erosion
B. Infertile soil
c. Both A and B
D. Good quality new soil
12
554Oil spills reduce ( _{text {一一一一一一一一- }} ) supplies within the water environment.
A. carbon dioxide
B. oxygen
c. nitrogen
D. none of these
12
555A lake receiving domestic sewage
shows
A. Drying up due to algal bloom
B. Increased fish production due to higher nutrient availability
C. Death of fish due to oxygen depletion
D. Increased food web organisation
12
556Arrange according to ascending order of
BOD.
(a) Highly polluted pond water
(b) Unpolluted pond water
(c) Distilled water
A. b-c-a
B. c-b-a
c. ( c-a-b )
D. a-c-b
12
557What is ‘Green house effect’?12
558‘Ozone layer’ is located in
A. Troposphere
B. Hydrosphere
c. stratosphere
D. Lithosphere
12
559108. Select the incorrect statement.
(a) If DO of water is below 6 ppm, the growth of fish
gets inhibited
(b) O reaches water through atmosphere or
photosynthesis carried out by many aquatic green
plants during day lightno b
(c) If BOD is below 5 ppm, it indicates polluted water
(d) Aerobic bacteria degrade organic waste and decrease
DO
12
560Exposure of UV radiations causes
A. Damage to eye sight
B. Sunburn
c. skin cancer
D. All of the above
12
561Describe how ozone layer is formed?12
562The washing away or removal of soil
from land is called
A. Soil formation
B. Soil erosion
c. crop rotation
D. Recycling
12
563Ozone layer absorbs ( 93-99 % ) of sun’s
high frequency ( _{-}-_{-}-_{-}- ) light.
12
564Measurement of water pollution is made by
A. Coliform count
B. Biological oxygen demand
c. pH
D. All of the above
12
565The factor responsible for depletion of ozone layer is
A. Excessive use of automobiles
B. Excessive industrial units
C. Excessive use of man made compounds containing chlorine and fluorine
D. Excessive deforestation
12

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