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Environmental Engineering in CE

Environmental Engineering in CE
__________ substances present in sewage are removed in grit chamber during sewage treatment.

Organic
Dissolved
Fatty
Inorganic

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Environmental Engineering in CE
Presence of __________ hardness is responsible for the temporary hardness in water.

Calcium
Carbonate
Sulphate
Choride

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

Extremely
Highly
Very extremely
Moderately

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

Ionosphere
Troposphere
None of these
Stratosphere

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Environmental Engineering in CE
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by

Biological oxygen pond
Lagoons
Filtration
Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)

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Environmental Engineering in CE
Noise level inside a jet air liner in normal flight is about __________ decibels.

100
125
80
145

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