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Environmental Engineering in CE

Environmental Engineering in CE
Main pollutants released from iron & steel industry is

H₂S, NO & SO₃
CO₂, H₂S & NO₂
SO₃, NO₂ & CO₂
CO, CO₂ & SO₂

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Environmental Engineering in CE
Septic tanks are used for the __________ of the deposited solids.

Separation
Anaerobic decomposition
None of these
Aerobic decomposition

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Environmental Engineering in CE
Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?

CO
SO₂
CFC (chloro fluoro carbons)
NOx

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

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

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Environmental Engineering in CE
Which of the following is a secondary air pollutant?

Dust particles
Sulphur dioxide
Nitrogen dioxide
Photochemical smog

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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.

12
1
8
4

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