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 None of these Ozone Hydrogen Carbon dioxide None of these Ozone Hydrogen ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE What are the methods of treatment & disposal of radioactive wastes? Biological methods & adsorption in ion exchange materials Evaporation & chemical precipitation All of these Fixing into a solid mass with cement and sinking deep in the sea Biological methods & adsorption in ion exchange materials Evaporation & chemical precipitation All of these Fixing into a solid mass with cement and sinking deep in the sea ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan Of increased diameter With greater number of blades Neither A nor B Both A & B Of increased diameter With greater number of blades Neither A nor B Both A & B ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Shouting by a man at his full voice corresponds to a voice level of about __________ decibels. 25 80 50 120 25 80 50 120 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas? Hydrogen Carbon monoxide Acetylene Ammonia Hydrogen Carbon monoxide Acetylene Ammonia ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated. Decreases Increases May increase or decrease ; depends on the chemical characteristics of polluted water Remains constant Decreases Increases May increase or decrease ; depends on the chemical characteristics of polluted water Remains constant ANSWER DOWNLOAD EXAMIANS APP
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