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Environmental Engineering in CE

Environmental Engineering in CE
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).

1
7
3
20

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Environmental Engineering in CE
Ionisation potential employed in the industrial electrostatic precipitator is of the order of

30 to 70 kV DC
30 to 70 kV AC
230 V DC
230 V AC

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Environmental Engineering in CE
Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect?

SO₃
N₂
H₂
CO₂

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Environmental Engineering in CE
The lowest layer of atmosphere is known as the

Troposphere
None of these
Ionosphere
Stratosphere

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Environmental Engineering in CE
Which of the following is not an air pollutant?

Metallic powders
Carcinogens
Ozone
Pesticides

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Environmental Engineering in CE
Ozone is

Impervious to ultra-violet rays
A primary pollutant
Both B & C
A secondary pollutant

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