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Environmental Engineering in CE

Environmental Engineering in CE
Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).

Extremely
Very extremely
Moderately
Highly

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Environmental Engineering in CE
Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage?

Sulphur dioxide & spray of weed killers
Smog & ozone
Carbon monoxide
Hydrogen fluoride & nitrogen oxides

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Environmental Engineering in CE
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the

Troposphere
None of these
Stratosphere
Ionosphere

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Environmental Engineering in CE
Noise level during normal conversation among men is about __________ decibles.

10
45
115
90

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Environmental Engineering in CE
'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the

Burning of domestic fuel
Industrial chimney exhaust
Photochemical reaction in polluted atmosphere
Automobiles exhaust

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Environmental Engineering in CE
Which of the following is the most major constituents of air pollutants?

Hydrogen sulphide
Oxides of nitrogen
Carbon monoxide
Oxides of sulphur

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