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Environmental Engineering in CE

Environmental Engineering in CE
The principal gas evolved from sludge digestion tank is

CO
CO₂
CH₄
N₂

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Environmental Engineering in CE
Which of the following fine dust removal equipments is the most efficient?

Scrubber
Electrostatic precipitator
Cyclone separator
Bag filter

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Environmental Engineering in CE
The lowest layer of atmosphere is known as the

Stratosphere
Ionosphere
Troposphere
None of these

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Environmental Engineering in CE
Average human body contains about __________ percent water by weight.

20
40
85
70

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Environmental Engineering in CE
If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is(i) Presumptive coli-form test(ii) Confirmed coli-form test(iii) Completed coli-form test

Both (i) and (iii)
Both (i) and (ii)
All (i), (ii) and (iii)
Only (i)

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Environmental Engineering in CE
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

90
120
105
60

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