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Environmental Engineering in CE

Environmental Engineering in CE
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).

4.8
0.002
0.2
1.2

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

Coagulation
Cation exchanger
Irradiation of water by ultraviolet light
Chlorine

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Environmental Engineering in CE
A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the

Global warming
Ionosphere
Atmospheric effect
Green house

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Environmental Engineering in CE
World's worst radioactive pollution was caused by nuclear reactor disaster which occured in

Moscow (U.S.S.R.)
Pensylvania (U.S.A.)
Chernobyl (undivided U.S.S.R.)
Arizona (U.S.A.)

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Environmental Engineering in CE
Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes

Turbidity
Foaming
Undesirable plant growth
Odour nuisances

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Environmental Engineering in CE
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.

200
140
120
170

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