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Environmental Engineering in CE

Environmental Engineering in CE
Carbonaceous particles having size less than 1 μm are called

Smoke
Aerosols
Grit
Aggregates

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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.

2000
500
5
1000

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

None of these
Stratosphere
Troposphere
Ionosphere

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Environmental Engineering in CE
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.

100 to 200
10 to 20
4000 to 5000
1500 to 2500

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Environmental Engineering in CE
Algae growth in water is controlled by

Deoxidation
Aeration
Chlorination
Bleaching

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Environmental Engineering in CE
Fresh domestic sewage is __________ in color.

Grey
Black
Dark brown
Red

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