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Environmental Engineering in CE

Environmental Engineering in CE
When the concentration of SO₂ in air is greater than __________ ppm, it gives a pungent smell.

4
0.1
0.01
1

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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.

90
105
120
60

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Environmental Engineering in CE
Which of the following acts as a natural source of air pollution?

Volcanic eruption
None of these
Deforestation
Forest fire

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Environmental Engineering in CE
In water chemical treatment plant, use of chloramines ensures

Removal of permanent hardness
Weed control in reservoirs
Taste & odour control
Disinfection

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

Cation exchanger
Irradiation of water by ultraviolet light
Chlorine
Coagulation

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Environmental Engineering in CE
Out of the following, TLV of __________ is maximum (about 500 ppm).

Carbon dioxide
Acetaldehyde
Carbon disulphide
Toluene

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