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Environmental Engineering in CE

Environmental Engineering in CE
Fresh sewage is __________ in nature.

Highly acidic
Neutral
Acidic
Alkaline

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Environmental Engineering in CE
The most commonly used chemical coagulant in water treatment is

Hydrazine
Lime
Ferrous sulphate
Alum

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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
Hydrogen
None of these
Ozone

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Environmental Engineering in CE
Maximum permissible turbidity in potable water is __________ ppm.

250
1000
10
1

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Environmental Engineering in CE
Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?

Troposphere
Thermosphere
None of these
Stratosphere

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Environmental Engineering in CE
Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million).

5000
2000
50
1000

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