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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.

2000
5
1000
500

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

Ionosphere
None of these
Troposphere
Stratosphere

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Environmental Engineering in CE
The resistance of water to the passage of light through it is a measure of the

Dissolved gases
Turbidity
Hardness
Color

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Environmental Engineering in CE
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in

Petroleum refinery
Iron & steel plant
Food industry
Municipal sewage treatment

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Environmental Engineering in CE
COD of raw municipal sewage may be in the range of about __________ mg/litre.

1500-2500
5-10
90-120
1-2

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Environmental Engineering in CE
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.

100-1000
100-200
10-100

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