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Environmental Engineering in CE

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

20
85
70
40

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

Dehydration
Reduction
Oxidation
Fermentation

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Environmental Engineering in CE
Which of the following sources is responsible for maximum air pollution?

Industrial chimney exhaust
Forest fire
Automobiles exhaust
Photochemical oxidation of organic matter

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Environmental Engineering in CE
Tri-sodium phosphate is used in boiler water treatment to reduce

Caustic embrittlement
Suspended silica
Dissolved oxygen
Turbidity

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Environmental Engineering in CE
For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.

5
500
10000
1000

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

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

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