Green house gases blanket/block the infrared radiation from earth’s surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ?

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High noise levels produced during operation of fans and compressors can be reduced by using__________________?

A. Mufflers (silencers) B. Acoustic absorbent C. Lagging of noisy duct D. None of these...

Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters ?

A. I-131 B. Sr-90 C. Au-198 D. Ra-226...

Presence of bacteria in potable (drinking) water causes_________________?

A. Turbidity B. Disease C. Bad odour D. Bad taste & colour...

Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes_________________?

A. Paralysis of muscles & loss of appetite B. Nervous depression C. Gastritis and diarrhea D. All A., B. and C....

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

A. Food industry B. Municipal sewage treatment C. Petroleum refinery D. Iron & steel plant...