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Environmental Engineering in CE

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

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

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Environmental Engineering in CE
'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the

Photochemical reaction in polluted atmosphere
Automobiles exhaust
Industrial chimney exhaust
Burning of domestic fuel

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

Carcinogens
Ozone
Metallic powders
Pesticides

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Environmental Engineering in CE
Ethanolamine is an absorbant used for the removal of __________ from air/gas.

H₂S
SO₂
HF
Both B & C

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Environmental Engineering in CE
Which of the following is the most severe air pollutant?

CO
SO₂
NOx
Hydrocarbons

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Environmental Engineering in CE
Tolerable limit of nitrogen oxides in air is __________ ppm.

5
1
25
0.1

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