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). 7 3 1 20 7 3 1 20 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Which of the following sources is responsible for maximum air pollution? Automobiles exhaust Photochemical oxidation of organic matter Industrial chimney exhaust Forest fire Automobiles exhaust Photochemical oxidation of organic matter Industrial chimney exhaust Forest fire ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU). 750 230 20 1500 750 230 20 1500 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm). Highly Very extremely Moderately Extremely Highly Very extremely Moderately Extremely ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels. 120 60 90 105 120 60 90 105 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Which of the following is the most widely used disinfectant in water treatment? Chlorine Coagulation Cation exchanger Irradiation of water by ultraviolet light Chlorine Coagulation Cation exchanger Irradiation of water by ultraviolet light ANSWER DOWNLOAD EXAMIANS APP
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