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NEET 2010
Exam
NEET
Year
2010
Subject
Botany
Chapter
Environmental Issues

NEET 2010 · Botany · Environmental Issues

d B is a standard abbreviation used for the quantitative expression...

dBd B is a standard abbreviation used for the quantitative expression of

Options

  1. Athe density of bacteria in a medium
  2. Ba particular pollutant
  3. Cthe dominant Bacillus in a culture
  4. Da certain pesticide

Correct answer

B. a particular pollutant

Step-by-step solution

Noise pollution is a physical form of pollution that affects the receiver directly. dB\mathrm{dB} (decibel) is a standard abbreviation used for the quantitative expression of noise. Noise or pollutant sound has a value of 80 dB80 \mathrm{~dB} and above, it harms hearing system. The WHO has fixed 45 dB45 \mathrm{~dB} as the safe noise level for a city.
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