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Environmental Engineering in CE

Environmental Engineering in CE
Maximum permissible residual chlorine in treated water should be __________ mg/litre.

0.001 to 0.01
02 to 0.3
2 to 3
5 to 10

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Environmental Engineering in CE
The concentration of water vapour in troposphere, which depends upon the altitude & temperature varies in the range of zero to __________ percent.

8
4
12
1

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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
5
20
1

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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.

Carbon dioxide
None of these
Hydrogen
Ozone

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Environmental Engineering in CE
Which is the most widely used coagulant for the treatment of turbid water?

Ferric chloride
Alum (aluminium sulphate)
Lime
Sodium aluminate

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Environmental Engineering in CE
The disinfection efficiency of chlorine increases by(i) Decreasing the time of contact(ii) Decreasing the temperature of water(iii) Increasing the temperature of water

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

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