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Environmental Engineering in CE

Environmental Engineering in CE
Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect?

CO₂
H₂
SO₃
N₂

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Environmental Engineering in CE
Insufficient washing of sand grains in a rapid sand filter causes

Expansion of filtering media
Mud balls
Shrinkage of filtering media
Air binding

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Environmental Engineering in CE
5-200 μm size particles are called

Dust
Smoke
Powder
Colloids or aerosols

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Environmental Engineering in CE
Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes

Fire hazards
Explosion hazards
Persistent foam
Depletion of dissolved oxygen

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

Dust
Grit
Smoke
Powder

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Environmental Engineering in CE
The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.

10
5
1
20

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