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Environmental Engineering in CE

Environmental Engineering in CE
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.

50
1
5
500

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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

Cesspool
Lagoon
Skimming mill
Septic tank

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Environmental Engineering in CE
Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas?

Electrostatic precipitator
Hydrocyclone
Gravity settling chamber
Packed scrubber

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Environmental Engineering in CE
The upper layer of atmosphere is called the

Stratosphere
None of these
Troposphere
Ionosphere

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Environmental Engineering in CE
The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.

5
1
10
20

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Environmental Engineering in CE
TLV of NO₂ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO₂ causes

Skin disorder
Cancer
Bone disease
Bronchitis

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