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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?

Bog iron (iron oxide)
Active carbon
Pulverised limestone
Silica gel

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Environmental Engineering in CE
Maximum permissible turbidity in potable water is __________ ppm.

1000
10
1
250

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Environmental Engineering in CE
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called

Grit
Powder
Smoke
Dust

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Environmental Engineering in CE
Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?

SO₂
CFC (chloro fluoro carbons)
NOx
CO

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Environmental Engineering in CE
Main pollutant present in automobile exhaust is

CO
NO
CO₂
Hydrocarbons

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Environmental Engineering in CE
80% less than 200 mesh size particles are called

Powder
Aggregates
Smoke
Grit

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