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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following processes is involved in the biochemical treatment of sewage effluents?

Oxidation
Reduction
Dehydration
Fermentation

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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
15
6.5
0.05

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Environmental Engineering in CE
Disinfection of water is done to remove

Color
Foul odour
Bacteria
Bad taste

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Environmental Engineering in CE
As compared to rapid sand filters, slow sand filters give
(i) Slower filtration rate
(ii) Higher filtration rate
(iii) Lesser efficiency in removal of bacteria
(iv) Higher efficiency in removal of bacteria
The correct answer is

(ii) and (iii)
(i) and (iv)
(ii) and (iv)
(i) and (ii)

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Environmental Engineering in CE
Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.

85
145
125
105

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Environmental Engineering in CE
In water chemical treatment plant, use of chloramines ensures

Weed control in reservoirs
Disinfection
Taste & odour control
Removal of permanent hardness

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MORE MCQ ON Environmental Engineering in CE

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