Environmental Engineering in CE Which of the following is not a secondary air pollutant? All of these Sulphur dioxide Photochemical smog Ozone All of these Sulphur dioxide Photochemical smog Ozone ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Lagoons used for purification of polluted water Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds Use micro-organisms/bacteria in presence of dissolved oxygen Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre All of these Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds Use micro-organisms/bacteria in presence of dissolved oxygen Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre All of these ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Noise level during normal conversation among men is about __________ decibles. 10 45 115 90 10 45 115 90 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE When the concentration of SO₂ in air is greater than __________ ppm, it gives a pungent smell. 1 4 0.1 0.01 1 4 0.1 0.01 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Lagooning process is mainly a means of the None of these Reduction of excessive flow in sewers Sludge disposal Biological treatment of wastes None of these Reduction of excessive flow in sewers Sludge disposal Biological treatment of wastes ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Maximum permissible residual chlorine in treated water should be __________ mg/litre. 2 to 3 02 to 0.3 0.001 to 0.01 5 to 10 2 to 3 02 to 0.3 0.001 to 0.01 5 to 10 ANSWER DOWNLOAD EXAMIANS APP
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