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Environmental Engineering in CE

Environmental Engineering in CE
Lagooning process is mainly a means of the

Reduction of excessive flow in sewers
None of these
Biological treatment of wastes
Sludge disposal

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

Extremely
Very extremely
Moderately
Highly

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Environmental Engineering in CE
Disinfection of water is done to remove

Foul odour
Bad taste
Bacteria
Color

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Environmental Engineering in CE
Ozone level is generally found to be depleted in India in the month of

December
April
February
July

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Environmental Engineering in CE
The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.

Dissolved oxygen content
All of these
Vapor pressure
Biological oxygen demand

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Environmental Engineering in CE
Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes

Depletion of dissolved oxygen
Fire hazards
Explosion hazards
Persistent foam

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