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Environmental Engineering in CE

Environmental Engineering in CE
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.

19
82
1
7

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Environmental Engineering in CE
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).

1
20
3
7

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Environmental Engineering in CE
Presence of high concentration of ozone and smog in atmospheric air causes the

Cracking of rubber products
Damage of electrical insulator on high tension power line
Fading of dye on textiles
Embrittlement & decrease of folding resistance of paper

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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

Stratosphere
Ionosphere
None of these
Troposphere

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Environmental Engineering in CE
Inorganic impurities causing water pollution is

Carbohydrates
Protein
Fats
Salts of metals

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Environmental Engineering in CE
Presence of a certain minimum quantity of flourine is desirable in potable water to prevent

Dental cavities
Scale formation
Water-borne disease
Corrosion

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