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
Ionosphere
Troposphere
Stratosphere

ANSWER DOWNLOAD EXAMIANS APP

Environmental Engineering in CE
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

Diluted with fresh water to reduce its acidity
None of these
Left as such without any treatment
Neutralised by alkali treatment

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Environmental Engineering in CE