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Environmental Engineering in CE

Environmental Engineering in CE
Disinfection of water is done to remove

Foul odour
Bad taste
Color
Bacteria

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Environmental Engineering in CE
Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.

Organic
None of these
Inorganic
Radioactive

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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
Smog is not formed due to the presence of __________ in the atmosphere.

SO₂
Any of these
NOx
CO₂

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Environmental Engineering in CE
Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.

85
105
125
145

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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

None of these
Stratosphere
Troposphere
Ionosphere

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