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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following is not a weightless pollutant?

Radioactive rays
SPM
Noise pollution
Thermal pollution

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Environmental Engineering in CE
Aerosols present in atmospheric air may be

Positively charged
Negatively charged
Combination of all A, B & C
Neutral

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Environmental Engineering in CE
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

Ultraviolet light for irradiation of water
Chlorine or its compounds
Ozone and iodine
All of these

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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
Fresh domestic sewage is __________ in color.

Dark brown
Red
Black
Grey

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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
0.05
15
1

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