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ENVIRONMENTAL ENGINEERING IN CE

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
1000
2000
5

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Environmental Engineering in CE
In sewage treatment, its sedimentation is speeded up by commonly adding

Copper sulphate
Hydrochloric acid
Lime
Sodium sulphate

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Environmental Engineering in CE
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called

Stratosphere
Mesosphere
Thermosphere
Troposphere

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Environmental Engineering in CE
Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.

120
95
140
75

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Environmental Engineering in CE
Out of the following, TLV of __________ is the minimum (about 0.02 ppm).

Phosgene
MIC (methyl iso-cynate)
Bromine
Ozone

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