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Environmental Engineering in CE

Environmental Engineering in CE
When the concentration of SO₂ in air is greater than __________ ppm, it gives a pungent smell.

0.1
1
4
0.01

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Environmental Engineering in CE
Presence of __________ bacteria in water causes disease like typhoid.

Non-pathogenic
Anaerobic
Pathogenic
Aerobic

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Environmental Engineering in CE
The concentration of water vapour in troposphere, which depends upon the altitude & temperature varies in the range of zero to __________ percent.

4
12
1
8

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Environmental Engineering in CE
During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum?

Cruising
Deaccelaration
Idle running
Acceleration

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Environmental Engineering in CE
High noise levels produced during operation of fans and compressors can be reduced by using

None of these
Lagging of noisy duct
Accoustical absorbent
Mufflers (silencers)

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Environmental Engineering in CE
Higher concentration of nitrogen dioxide in atmospheric air causes

Cancer
Corrosion
Asphyxiation
Bronchitis

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