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Environmental Engineering in CE

Environmental Engineering in CE
Pick out the wrong statement pertaining to 'green house' for the plants.

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Environmental Engineering in CE
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.

500
2000
1000
5

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Environmental Engineering in CE
Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage?

Carbon monoxide
Smog & ozone
Hydrogen fluoride & nitrogen oxides
Sulphur dioxide & spray of weed killers

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Environmental Engineering in CE
Which of the following is a secondary air pollutant?

Photochemical smog
Nitrogen dioxide
Dust particles
Sulphur dioxide

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Environmental Engineering in CE
The resistance of water to the passage of light through it is a measure of the

Hardness
Dissolved gases
Turbidity
Color

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Environmental Engineering in CE
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.

10000 to 100000
1000 to 2000
6000 to 9000
3000 to 6000

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