Environmental Engineering in CE A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it. Carbon dioxide Hydrogen Ozone None of these Carbon dioxide Hydrogen Ozone None of these ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream? Sedimentation tank Mechanical flocculation Circular clarifier Chemical coagulation Sedimentation tank Mechanical flocculation Circular clarifier Chemical coagulation ANSWER DOWNLOAD EXAMIANS APP
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). 1 3 7 20 1 3 7 20 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Noise level inside a jet air liner in normal flight is about __________ decibels. 125 100 145 80 125 100 145 80 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Fine grit present in sewage is removed in the __________ during sewage treatment. Grit chamber Skimming tank Trickling filter Detritus tank Grit chamber Skimming tank Trickling filter Detritus tank ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE The lowest layer of atmosphere is known as the Ionosphere Stratosphere None of these Troposphere Ionosphere Stratosphere None of these Troposphere ANSWER DOWNLOAD EXAMIANS APP
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