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Question

Decibel (db) is used for the quantitative expression of

A
the density of bacteria in a medium
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B
intensity of noise
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C
the dominant Bacillus in a culture
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D
a ceratin pesticide
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Solution

The correct option is B intensity of noise
According to the World Health Organization, sound levels less than 70 dB are not damaging to living organisms, regardless of how long or consistent the exposure is. Noise above 70 dB is considered a pollutant. So decibel is a standard abbreviation used for the quantitative expression of noise pollution.

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