Chemical Engineering - Environmental Engineering

6. 

Death may occur, when SO2 concentration in atmospheric air exceeds __________ ppm.

A. 20
B. 100
C. 400
D. 200

Answer: Option C

Explanation:

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7. 

Which of the following acts as a natural source of air pollution ?

A. Forest fire
B. Deforestation
C. Volcanic eruption
D. None of these

Answer: Option C

Explanation:

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8. 

Higher concentration of CO2 in atmosphere

A. allows visible solar radiation (ultraviolet) of short wave-length to pass through.
B. reflects and absorbs the longer wavelength (infra-red) radiations.
C. prevents solar heat being radiated out completely, resulting in 'heat trap' i.e., global warming.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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9. 

Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).

A. highly
B. moderately
C. extremely
D. very extremely

Answer: Option B

Explanation:

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10. 

Radioactive substances present in the polluted water stream can be removed by

A. biological oxygen treatment.
B. coagulation and filtration.
C. adsorption in ion exchange materials.
D. none of these.

Answer: Option C

Explanation:

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