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Environmental Engineering in CE

Environmental Engineering in CE
Smog is not formed due to the presence of __________ in the atmosphere.

NOx
Any of these
CO₂
SO₂

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Environmental Engineering in CE
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.

6.5
1
15
0.05

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Environmental Engineering in CE
Algae growth in water is controlled by

Chlorination
Deoxidation
Aeration
Bleaching

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

Oxidation
Dehydration
Reduction
Fermentation

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

Ionosphere
Stratosphere
Troposphere
None of these

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Environmental Engineering in CE
The main type of sludge gas evolved during sewage treatment in Imhoff tank is

H₂
CO
CH₄
CO₂

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