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Environmental Engineering in CE

Environmental Engineering in CE
Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm.

400
200
100
20

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Environmental Engineering in CE
There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?

Aluminium
Lead
Mercury
Arsenic

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

Stratosphere
None of these
Troposphere
Ionosphere

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Environmental Engineering in CE
White smoke coming out of the chimney of a furnace indicates the use of

Low excess air
Gaseous fuel in the furnace
Liquid fuel in the furnace
Very high excess air

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Environmental Engineering in CE
The pH value of potable water should be between

1 to 1.5
13 to 14
6.5 to 8
4 to 5

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Environmental Engineering in CE
Most of the bacteria in sewage are

Parasitic
None of these
Saprophytic
Anerobic

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