Environmental Chemistry CDS Questions

CDS Chemistry

Environmental Chemistry MCQ Questions


13.
Which index is widely used in India to communicate the current level of air pollution and its associated health risk to the general public?
A.
Air Quality Index (AQI)
B.
Carbon Footprint Index
C.
Water Quality Index
D.
Soil Fertility Index
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ANSWER :
A. Air Quality Index (AQI)
14.

Catalytic converters fitted in the exhaust systems of vehicles mainly help reduce air pollution by converting harmful gases like CO and NOx into:

A.

Ozone and chlorine gas

B.

Pure oxygen and hydrogen gas

C.

Methane and ammonia

D.

Less harmful gases such as CO2, N2, and water vapour

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ANSWER :

D. Less harmful gases such as CO2, N2, and water vapour

15.
Which fuel is generally considered a cleaner alternative to petrol and diesel for reducing vehicular air pollution, and has been widely promoted for public transport in Indian cities?
A.
Crude oil
B.
Coal
C.
Compressed Natural Gas (CNG)
D.
Kerosene
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ANSWER :
C. Compressed Natural Gas (CNG)
16.
The natural (unpolluted) concentration of carbon dioxide in the atmosphere is approximately:
A.
21% by volume
B.
0.03% by volume
C.
3% by volume
D.
78% by volume
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ANSWER :
B. 0.03% by volume
17.
Volatile organic compounds (VOCs) released from sources such as paints, solvents, and vehicle exhaust mainly contribute to the formation of:
A.
Hard water deposits
B.
Permanent ozone layer thickening
C.
Acid rain exclusively
D.
Photochemical smog and ground-level ozone
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ANSWER :
D. Photochemical smog and ground-level ozone
18.
Which of the following is generally NOT classified as a gaseous air pollutant, but rather as a particulate pollutant?
A.
Smoke
B.
Sulphur dioxide
C.
Oxides of nitrogen
D.
Carbon monoxide
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ANSWER :
A. Smoke