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Environmental Engineering in CE

Environmental Engineering in CE
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.

15 to 20
1 to 2
9 to 10
4 to 5

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Environmental Engineering in CE
Presence of __________ in water stream are deleterious to aquatic life.

Heavy metals and cynides
All of these
Soluble and toxic organics
Suspended solids

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Environmental Engineering in CE
Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?

Ra-226
Au-198
Sr-90
I-131

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Environmental Engineering in CE
Which of the following industries discharge mercury as a pollutant?

Chloro-alkali industry
Phosphoric acid plant
Tanneries
Beverage plant

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Environmental Engineering in CE
A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the

Green house
Global warming
Atmospheric effect
Ionosphere

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Environmental Engineering in CE
Which of the following is a manmade source of air pollution?

Forest fire
All of these
Bacterial action in soil and swamp areas
Automobile exhaust

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