1.

dN is a standard abbreviation used for the quantitative expression ofA. the density of bacteria in a mediumB. a particular pollutantC. the dominant Bacillus in a cultureD. a certain pesticide

Answer» Correct Answer - B
Noise pollution is a physical form of pollution that affects the receiver directly affecting the nervous system which result into various disorders in humans. dB (decibel) is a standard abbreviation used for the quantitative expression of noise. Noise or pollutant sound has a value of 80 dB and above, it harms hearing system. The WHO has fixed 45 dB as the safe noise level for a city.


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