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Environmental Engineering in CE

Environmental Engineering in CE
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.

19
1
82
7

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Environmental Engineering in CE
A standard test for determination of hardness in water is termed as __________ test.

EDTA
Electometric
Total count
Presumptive

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Environmental Engineering in CE
The Killer gas which caused Bhopal gas tragedy in 1984 was

Sulphur dioxide
Phosgene
Carbon monoxide
Methyl iso-cynate (MIC)

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Environmental Engineering in CE
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

In sedimentation tanks equipped with mechanical scrapper
In clarifiers
In vacuum filter
By chemical coagulation

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Environmental Engineering in CE
Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes

Nervous depression
All of these
Gastritis & diarrhea
Paralysis of muscles & loss of appetite

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Environmental Engineering in CE
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

None of these
Ozone
Carbon dioxide
Hydrogen

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