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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?

Troposphere
Thermosphere
Stratosphere
None of these

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Environmental Engineering in CE
The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.

10
20
1
5

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Environmental Engineering in CE
In water treatment plant, zeolite process is used to remove the __________ of water.

Hardness
Alkalinity
Acidity
Iron & zinc

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Environmental Engineering in CE
Out of the following, TLV of __________ is maximum (about 500 ppm).

Acetaldehyde
Toluene
Carbon dioxide
Carbon disulphide

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Environmental Engineering in CE
The function of skimming tank in sewage treatment is to remove __________ substances.

Oil & fatty
Dissolved solid
Gritty & inorganic
Suspended solid

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Environmental Engineering in CE
There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?

Lead
Aluminium
Arsenic
Mercury

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