Q41 / 200 · NEET 2010 (Screening) · Botany

$d B$ is a standard abbreviation used for the quantitative expression of

  • A
    the density of bacteria in a medium
  • Correct answer
    B
    a particular pollutant
  • C
    the dominant Bacillus in a culture
  • D
    a certain pesticide

Solution

Noise pollution is a physical form of pollution that affects the receiver directly. $\mathrm{dB}$ (decibel) is a standard abbreviation used for the quantitative expression of noise. Noise or pollutant sound has a value of $80 \mathrm{~dB}$ and above, it harms hearing system. The WHO has fixed $45 \mathrm{~dB}$ as the safe noise level for a city.

Hence, the correct answer is option: 'B'.

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