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Environmental Engineering in CE

Environmental Engineering in CE
If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.

50
3000 (i.e. 0.3%)
500
1000

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Environmental Engineering in CE
The lowest layer of atmosphere is known as the

Stratosphere
Ionosphere
None of these
Troposphere

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Environmental Engineering in CE
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by

Skimming off
Settling out using chemical reagents
Chlorination
Biological oxidation

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

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

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Environmental Engineering in CE
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called

Lagoon
Skimming mill
Cesspool
Septic tank

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

Highly
Extremely
Moderately
Very extremely

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