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Environmental Engineering in CE

Environmental Engineering in CE
Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.

50
25
80
120

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Environmental Engineering in CE
Which of the following processes is involved in the biochemical treatment of sewage effluents?

Fermentation
Dehydration
Reduction
Oxidation

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Environmental Engineering in CE
__________ is removed from water by lime-soda process.

Foul smell and taste
Permanent hardness
Temporary hardness
Iron and manganese

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Environmental Engineering in CE
Workers working in __________ industry are most prone to white lung cancer.

Textile
Asbestos
Coal mining
Limestone mining

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Environmental Engineering in CE
The biological decomposition of organic substances in wastes controlled conditions is called

Composting
Incineration
None of these
Biological oxidation

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Environmental Engineering in CE
Direct reaction of unsaturated hydrocarbons with either NO or NO₂ produces an eye irritating pollutant compound known as

Peroxy acetyl nitrate (PAN) or methyl nitrile
Photochemical smog
Poly acrylonitrile
Benzopyrene

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