Which of the following factors help to measure quallity of water?
A. DO
B. BOD
C. COD
D. All of the above
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Chemistry
Which of the following gases is the main cause of acid rain?
A. CO
B. NO2
C. both a & b
D. None of the above
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Which of the following is not primary pollutant
A. SO3
B. CO
C. NO
D. H2SO4
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The yellow colour in photochemical smog is due to presence of
A. dinitrogen oxide
B. nitrogen dioxide
C. chlorine gas
D. chlorine dioxide
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Major cause of SO2 on global scale is
A. volcanoes
B. electric sparks
C. combustion
D. all
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Which of the following is not a secondary pollutant
A. ozone
B. carbonic acid
C. sulphuric acid
D. carbon dioxide
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Requirement of macronutrient per acre of the land is
A. 5 to 200 kg
B. 20-200 kg
C. 200-400 kg
D. 30-400 kg
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Which of the following is not a heavy industry?
A. iron
B. fertilizer
C. paper
D. none
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Pollutants have adverse effect over
A. Biosphere
B. Ecosystem
C. Both a & b
D. Hydrosphere
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The main product of bacterial action is
A. Nox
B. NO2
C. N2O3
D. NO
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