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

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

ANSWER DOWNLOAD EXAMIANS APP

Environmental Engineering in CE
Smoke is produced due to

Poor quality of fuel and improper mixing of fuel & combustion air
Poor design & overloading of furnace
Insufficient supply of combustion air and insufficient time for combustion
All of these

ANSWER DOWNLOAD EXAMIANS APP

Environmental Engineering in CE
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

Coagulation and flocculation of colloids
All of these
Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate
Oxidation of carbonaceous matter to CO₂

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Environmental Engineering in CE