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Environmental Engineering in CE

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

Fermentation
Dehydration
Reduction
Oxidation

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

5
1
500
50

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Environmental Engineering in CE
Cleaning is done by(i) Scraping and removal in filters slow sand(ii) Back washing in slow sand filters(iii) Scraping and removal in filters rapid sand(iv) Back washing in rapid sand filtersThe correct answer is

(i) and (iv)
(ii) and (iv)
(i) and (ii)
(ii) and (iii)

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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?

CFC (chloro fluoro carbons)
SO₂
CO
NOx

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Environmental Engineering in CE
Which of the following pollutants is absent in the emissions from a fertiliser plant ?

SO₂ & SO₃
NH₃
NO₂
CO

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Environmental Engineering in CE
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.

10-100
100-1000
100-200

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