Chemical Engineering - Environmental Engineering

31. 

Pick out the wrong statement.

A. Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust.
B. NO2 is capable of penetrating the troposphere and can absorb both ultraviolet & visible light.
C. Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees.
D. H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2.

Answer: Option D

Explanation:

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32. 

Which of the following is not an air pollutant ?

A. Ozone
B. Carcinogens
C. Pesticides
D. Metallic powders

Answer: Option A

Explanation:

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33. 

Presence of high concentration of ozone and smog in atmospheric air causes the

A. embrittlement & decrease of folding resistance of paper.
B. cracking of rubber products.
C. fading of dye on textiles.
D. damage of electrical insulator on high tension power line.

Answer: Option B

Explanation:

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34. 

Algae growth in water is controlled by

A. deoxidation
B. chlorination
C. bleaching
D. aeration

Answer: Option B

Explanation:

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35. 

__________ is removed from water by lime-soda process.

A. Foul smell and taste
B. Iron and manganese
C. Temporary hardness
D. Permanent hardness

Answer: Option C

Explanation:

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