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Environmental Engineering in CE

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

140
200
120
170

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Environmental Engineering in CE
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

Hydrogen
Ozone
None of these
Carbon dioxide

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Environmental Engineering in CE
Smog is not formed due to the presence of __________ in the atmosphere.

CO₂
Any of these
NOx
SO₂

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Environmental Engineering in CE
Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by

Discharging in the river stream
Filtration and recycling for cooling coke oven gas
None of these
Quenching of hot coke

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Environmental Engineering in CE
Polluted water having low BOD are most economically treated in

Sludge digester
Clarifier
Oxidation ponds
Sedimentation tanks

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Environmental Engineering in CE
Which of the following is a green house gas other than CO₂ ?

Methane
Nitrous oxide
Chlorofluro carbons (CFC)
All of these

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