Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in___________________?

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Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate ?

A. CO B. SO2 C. NOx D. CFC (chloro fluoro carbons)...

Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas ?

A. Packed scrubber B. Gravity settling chamber C. Electrostatic precipitator D. Hydrocyclone...

Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause___________________?

A. Explosion B. Non biodegradable foam C. Undesirable plant growth D. Corrosion...

Maximum permissible residual chlorine in treated water should be ____________ mg/litre?

A. 0.001 to 0.01 B. 0.2 to 0.3 C. 2 to 3 D. 5 to 10...

Pick out the wrong statement ?

A. The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in ozone B. Mesosphere is characterised by very low atmospheric pressure and low temperature C. Troposphere is a dusty zone containing water vapor and clouds D. The radio waves used in the long distance radio communication are reflected back to earth … Pick out the wrong statement ?Read More...