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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following is a manmade source of air pollution?

Forest fire
Bacterial action in soil and swamp areas
All of these
Automobile exhaust

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

Photochemical smog
Sulphur dioxide
Ozone
All of these

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

None of these
Aerobic decomposition
Separation
Anaerobic decomposition

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Environmental Engineering in CE
Solid content in most of the domestic sewage is about __________ percent.

10
0.001
0.1
5

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Environmental Engineering in CE
Polyvinyl chloride containers are not suitable for storing

None of these
Woolen clothes
Foodstuffs
Metallic powder

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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.

50
500
5
1

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