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Environmental Engineering in CE

Environmental Engineering in CE
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).

7
3
1
20

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Environmental Engineering in CE
Which of the following sources is responsible for maximum air pollution?

Automobiles exhaust
Photochemical oxidation of organic matter
Industrial chimney exhaust
Forest fire

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Environmental Engineering in CE
The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).

750
230
20
1500

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

Highly
Very extremely
Moderately
Extremely

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Environmental Engineering in CE
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

120
60
90
105

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Environmental Engineering in CE
Which of the following is the most widely used disinfectant in water treatment?

Chlorine
Coagulation
Cation exchanger
Irradiation of water by ultraviolet light

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