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Environmental Engineering in CE

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

N₂
CO
CH₄
CO₂

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Environmental Engineering in CE
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by

Neither A nor B
Both A & B
Photosynthetic action of algae
Natural aeration of water stream

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Environmental Engineering in CE
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.

1
0.05
6.5
15

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Environmental Engineering in CE
Hardy cross method of analysis of distribution system(i) Involves successive trials(ii) Takes economic aspects into account(iii) Is time consuming

Only (i)
(i) and (ii)
All are correct
(i) and (iii)

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Environmental Engineering in CE
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

Ultraviolet light for irradiation of water
Ozone and iodine
All of these
Chlorine or its compounds

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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.

1
4
12
8

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