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Environmental Engineering in CE

Environmental Engineering in CE
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.

10 to 20
4000 to 5000
100 to 200
1500 to 2500

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Environmental Engineering in CE
Presence of nitrates in water in excess of 50 ppm causes

Tooth decay
Gastroentetitis
Asphyxiation
Mathenoglobenemia

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

Fermentation
Oxidation
Reduction
Dehydration

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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.

4
1
12
8

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Environmental Engineering in CE
Photochemical smog is formed from automobile exhaust

All of these
By reaction of hydrocarbon & nitric oxide in presence of sunlight
Is harmful for crops and trees also besides causing eye irritation & asthma
Appears only on sunny days

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Environmental Engineering in CE
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).

15-20
43961
43832
25-30

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