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Quiz 6
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Q.1
Which greenhouse gas contributes 20% of global warming .... ..... [A.M.U. 2012]
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a) Methane
0%
b) N2O
0%
c) CFC
0%
d) CO2
Explanation
Carbon dioxide contributes to 60% of global warming. Methane contributes to 20% of global warming N2O contibutes 6% of global warming. CFC contributes 14% of global warming. Answer : (a)
Q.2
Increasing skin cancer and high mutation rate are due to ... .... [A.I.I.M.S. 1996]
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a) Acid rain
0%
b) Ozone depletion
0%
c) CO pollution
0%
d) CO2 pollution
Explanation
Ozone in stratosphere, and it acts as a shield absorbing ultraviolet radiation from the sun. UV rays are highly injurious to living organisms since DNA and proteins of living organisms preferentially absorb UV rays, and its high energy breaks the chemical bonds within these molecules.It also cause skin cancer and snow blindness. Ozone depletion result in UV rays reaching earth cause skin cancer and mutation. Answer : (b)
Q.3
DDT is ... .... [A.M.U. 2003]
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a) Organophosphate
0%
b)Organochlorine
0%
c) Carbonate
0%
d) Triazine
Explanation
Dichlorodiphenyltrichloroethane, commonly known as DDT, is a colorless, tasteless, and almost odorless crystalline chemical compound, an organochlorine. Answer : (b)
Q.4
The Air Act was amended in 1987 to include one of the following as pollutant .... .... [A.M.U. 2010]
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a) Dust
0%
b) Noise
0%
c) Water
0%
d) None
Explanation
In India, the Air (Prevention and Control of Pollution) Act came into force in 1981, but was amended in 1987 to include noise as an air pollutant. Answer : (b)
Q.5
Component of photochemical smog is ... ... [A.M.U. 1997]
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a) O3
0%
b) PAN
0%
c) PPN , PBN
0%
d) Both A and B
Explanation
The major undesirable components of photochemical smog are nitrogen dioxide (NO2), ozone (O3), PAN (peroxyacetylnitrate), and chemical compounds that contain the –CHO group (aldehydes). Answer : (d)
Q.6
Thickness of ozone in column of air from ground to top of atmosphere is measured in terms of .... .... [Kerala 2010]
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a) Decibel units
0%
b) Pascal units
0%
c) Svedberg units
0%
d) Dobson units
Explanation
The thickness of the ozone in a column of air from the ground to the top of the atmosphere is measured in terms of Dobson units (DU). Answer : (d)
Q.7
Peeling of ozone umbrella is due to ... .... [A.F.M.C. 1999]
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a) CFC
0%
b) PAN
0%
c) CO2
0%
d) Coal burning
Explanation
the balance of ozone layer has been disrupted due to enhancement of ozone degradation by chlorofluorocarbons (CFCs). CFCs find wide use as refrigerants. CFCs discharged in the lower part of atmosphere move upward and reach stratosphere. In stratosphere, UV rays act on them releasing Cl atoms. Cl degrades ozone releasing molecular oxygen, with these atoms acting merely as catalysts; Cl atoms are not consumed in the reaction. Answer : (a)
Q.8
Primary constituents of photochemical smog are .... .... [C.P.M.T. 2010]
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a) SO2 and CO
0%
b) CO2 and NO2
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c) NO2 and unsaturated hydrocarbons
0%
d) Hydrocarbons and CFC
Explanation
The major undesirable components of photochemical smog are nitrogen dioxide (NO2), ozone (O3), PAN (peroxyacetylnitrate), and chemical compounds that contain the –CHO group (aldehydes). Answer : (c)
Q.9
Result of ozone hole is ... ..... [K.C.E.T. 2001]
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a) Green house effect
0%
b) Global warming
0%
c) Acid rain
0%
d) UV radiations reach the earth
Explanation
Answer : (d)
Q.10
Ozone is passed through swimming pool because it .... .... [C.P.M.T. 2007]
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a) Absorbs UV radiations
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b) Acts as disinfectant
0%
c) Easily available from oxygen
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d) All
Explanation
Ozone (O3) is a very effective disinfection agent and can be used in swimming pools to replace chlorine and bromine containing disinfection chemicals. Answer : (b)
Q.11
Eutrophication is caused by .... ..... [Wardha 2001]
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a) Lack of algae in a lake
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b) Abundant oxygen in ponds
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c) Run-off of fertilizers in lake
0%
d) Excess nektons in lake
Explanation
Eutrophication is the natural aging of a lake by nutrient enrichment of its water. It occurs when a body of water becomes overly enriched with minerals and nutrients which induce excessive growth of algae. This process may result in oxygen depletion of the water body. Answer : (c)
Q.12
Checking of re-radiating heat by atmospheric dust, ozone,CO2 and water vapour is .... .... [M.P.P.M.T. 1998]
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a) Ozone layer effect
0%
b) Solar effect
0%
c) Radioactive effect
0%
d) Green house effect
Explanation
The greenhouse effect can be defined as the capture and re-radiation of the infre-red radiations by the tropospheric gases like ozone, carbon dioxide, water vapours and dust. This lead to the increase in the temperature of the atmosphere, and as a result the over all temperature of the earth increases, causing global warming. Answer : (d)
Q.13
Which one of the following is mismatched? .... .... [C.B.S.E. 2005]
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a) Fossil fuel burning - Release of carbon dioxide
0%
b) Nuclear power - Radioactive wastes
0%
c) Solar energy - Green house effect
0%
d) Biomass burning - Release of carbon dioxide
Explanation
During combustion or burning, carbon from fossil fuels combine with oxygen in the air to form carbon dioxide and water vapor. Radioactive (or nuclear) waste is a byproduct from nuclear reactors, fuel processing plants, hospitals and research facilities. Radioactive waste is also generated while decommissioning and dismantling nuclear reactors and other nuclear facilities. The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere. It is caused by grrenhouse gases like carbon dioxide, methane etc. Burning either fossil fuels or biomass releases carbon dioxide (CO2), a greenhouse gas. However, the plants that are the source of biomass for energy capture almost the same amount of CO2 through photosynthesis while growing as is released when biomass is burned, which can make biomass a carbon-neutral energy source. Answer : (c)
Q.14
Calcium metabolism in birds gets disturbed due to effect of ..... ..... [Kerala 2011]
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a) Mercury
0%
b) Cadmium
0%
c) DDT
0%
d) Lead
Explanation
High concentrations of DDT disturb calcium metabolism in birds, which causes thinning of eggshell and their premature breaking, eventually causing decline in bird populations. Answer : (c)
Q.15
Environmental Protection Act was passed in .... ..... [C.P.M.T. 2005]
0%
a) 1986
0%
b) 1981
0%
c) 1974
0%
d) 1968
Explanation
Environmental protection act was passed in March 1986, it came into force on 19 November 1986. Answer : (a)
Q.16
Atmosphere of big cities is polluted most by ..... [C.P.M.T.1996]
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a) Automobile exhausts
0%
b) Pesticide residue
0%
c) Household
0%
d) Radio-active fall-out
Explanation
Automobiles are a major cause for atmospheric pollution atleast in the metro cities. Catalytic converters, having expensive metals namely platinum-palladium and rhodium as the catalysts, are fitted into automobiles for reducing emission of poisonous gases. As the exhaust passes through the catalytic converter, unburnt hydrocarbons are converted into carbon dioxide and water, and carbon monoxide and nitric oxide are changed to carbon dioxide and nitrogen gas, respectively. Motor vehicles equipped with catalytic converter should use unleaded petrol because lead in the petrol inactivates the catalyst. Answer : (a)
Q.17
Green house effect is due to .... ..... [A.F.M.C. 2000]
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a) CO2
0%
b) CH4,SO2 and NO2
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c) Combination of many gases
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d) Gases which absorb infra-red reflected from earth
Explanation
The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere. Radiatively active gases in a planet's atmosphere radiate energy in all directions. Water vapor, carbon dioxide, methane, and other trace gases in Earth's atmosphere absorb the longer wavelengths of outgoing infrared radiation from Earth's surface. Answer : (d)
Q.18
Pollution can bring about change in .... .... [C.P.M.T. 1995]
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a) Biogeochemical cycling
0%
b) Abiotic environment
0%
c) Biotic environment
0%
d) None
Explanation
Answer : (c)
Q.19
CO2, CH4, N2O, CFC are called green house gases because they can absorb .... .... [Kerala 2005]
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a) UV radiations
0%
b) Long wave infra-red radiations
0%
c) Visible light radiations
0%
d) X-ray radiation
Explanation
Water vapor, carbon dioxide, methane, and other trace gases in Earth's atmosphere absorb the longer wavelengths of outgoing infrared radiation from Earth's surface. Answer : (b)
Q.20
Which one of the following will not control particulate pollutants ... .... [Kerala 2006]
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a) Incinerator
0%
b) Arrester
0%
c) Scrubber
0%
d) Filter
Explanation
fabric filter is an air pollution control device and dust collector that removes particulates or gas released from commercial processes out of the air. A scrubber can remove gases like sulphur dioxide. In a scrubber, the exhaust is passed through a spray of water or lime. Arrester are used to separate particulate matter (PM) from contaminated air. Incinerator is the device where waste is burnt e.g. furnace. It converts the waste material into ash, gases, particles and heat. Answer : (a)
Q.21
Which is correct about statement X and Y. Statement X: Deforestation cause global warming Statement Y: Deforestation increases level of green house gas CO2 in atmosphere Guj .C.E.T. 2009
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a) X and Y are both correct, Y is proper explanation.
0%
b) X and Y are both correct, Y is not proper explanation.
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c) X is correct, Y is not correct
0%
d) X and Y is not correct
Explanation
he surplus carbon is stored in the plant, helping it to grow. When trees are cut down and burned or allowed to rot, their stored carbon is released into the air as carbon dioxide. And this is how deforestation and forest degradation contribute to global warming. Statement X and Y are correct and statement Y is correct explanation for statement X as increase in green house gas level lead to global warming. Answer : (a)
Q.22
In Kyoto protocol, the major nations agreed to reduce emission of green house gases by .... .... [M.P.P.M.T. 2007]
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a) 2008
0%
b) 2010
0%
c) 2012
0%
d) 2018
Explanation
Developed, industrialized countries made a promise under the Kyoto Protocol to reduce their annual hydrocarbon emissions by an average of 5.2% by the year 2012. Answer : (c)
Q.23
Lichens indicate pollution by .... ... [B.H.U. 2012]
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a) SO2
0%
b) NO2
0%
c) CO
0%
d) O3
Explanation
Lichens also absorb sulphur dioxide dissolved in water. Lichens are widely used as environmental indicators or bio-indicators. If air is very badly polluted with sulphur dioxide there may be no lichens present, just green algae may be found. If the air is clean, shrubby, hairy and leafy lichens become abundant. Answer : (a)
Q.24
Limit of BOD prescribed by Central Pollution Control Broad for discharge of industrial and municipal waste waters into natural surface waters is .... .... [C.B.S.E. 2006]
0%
a) <3.0 ppm
0%
b) <10 ppm
0%
c) <30 ppm
0%
d) <100 ppm
Explanation
The central pollution control board prescribed the BOD limit for the discharge of industrial and municipal waste water as < 10 ppm. Answer : (c)
Q.25
In a polluted environment, maximum pollutant will occur in .... .... [A.M.U. 2010]
0%
a) Primary producers
0%
b) Tertiary consumers
0%
c) Secondary consumers
0%
d) Primary consumers
Explanation
Answer : (b)
Q.26
Lichens are sensitive to ... .... [A.M.U 2001]
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a) Noise pollution
0%
b) Air pollution
0%
c) Water pollution
0%
d) Nuclear pollution
Explanation
Lichen, is sensitive to atmospheric pollutant such as sulphur dioxide, lead and mercury emissions. This sensitivity makes lichen a valuable biological indicator of air quality. Answer : (b)
Q.27
Find out incorrect statement in relation to pollution .... ..... [Manipur 2006]
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a) Plastic is nondegradable pollutant
0%
b) Water vapours, smoke fumes and dust mixture forms smog
0%
c) PAN affects photosynthesis
0%
d) Ozone layer forms protective shield to atmosphere
Explanation
Most ozone resides in the stratosphere (a layer of the atmosphere between 10 and 40 km above us), where it acts as a shield to protect Earth's surface from the sun's harmful ultraviolet radiation. Answer : (d)
Q.28
Ultraviolet radiations from sunlight causes a reaction that produces .... .... [C.B.S.E. 1993]
0%
a) Fluorides
0%
b) Carbon monoxide
0%
c) Sulphur dioxide
0%
d) Ozone
Explanation
Ozone gas is continuously formed by the action of UV rays on molecular oxygen, and also degraded into molecular oxygen in the stratosphere. Answer : (d)
Q.29
UNEP stands for .... .... [Manipur 2009]
0%
a) United Nations Ecotype Programme
0%
b) United Nations Ecological Programme
0%
c) United Nations Education Programme
0%
d) United Nations Environment Programme
Explanation
The United Nations Environment Programme (UNEP) is the leading environmental authority in the United Nations system. UNEP main goals include analysis and assessment of global environment, early warning of environmental threats, elaboration of international environmental legislation for sustainable development, raising public awareness on international environmental policy and activities Answer : (d)
Q.30
Which is not proper strategy to reduce global warming .... ..... [Kerala 2006]
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a) Developing substitutes of CFC
0%
b) Increasing use of air conditioners, refrigeration units and production of plastic foams and propellants in aerosol spray cans
0%
c) Minimizing use of nitrogen fertilizer in agriculture for reducing nitrogen oxides emission
0%
d) Reducing green house gas emission by limiting use of fossil fuels
Explanation
Developing substitutes for chloroflurocarbon will not allow the build of chlorine radical in the atmosphere. Minimal use of nitrogen fertilizers will not allow nitrogen oxides to cause secondary pollutants Limited use of fossil fuels will not add carbon dioxide, methane, oxides of sulphur etc and thus environment can be saved from their deleterious effects. increase use of ACs, refrigerators, production of plastic forms and aerosol spray can propellants are harmful to the environment in a great deal because they cause ozone hole as well as global warming. Answer : (b)
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