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Environmental Engineering in CE

Environmental Engineering in CE
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.

3000 to 6000
1000 to 2000
10000 to 100000
6000 to 9000

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

Photochemical smog
Nitrogen dioxide
Dust particles
Sulphur dioxide

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Environmental Engineering in CE
Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by

Chemical coagulation
Centrifugation
Floatation & skimming
Ultrafiltration

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Environmental Engineering in CE
Which of the following industries discharge mercury as a pollutant?

Beverage plant
Phosphoric acid plant
Tanneries
Chloro-alkali industry

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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?

SO₂
CO
CFC (chloro fluoro carbons)
NOx

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Environmental Engineering in CE
Salt content in sea water is about __________ percent.

3.5
0.5
10
1

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