A) the density of bacteria in a medium
B) a particular pollutant
C) the dominant Bacillus in a culture
D) a certain pesticide
Correct Answer: B
Solution :
Noise pollution is a physical form of pollution that affects the receiver directly 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.
You need to login to perform this action.
You will be redirected in
3 sec
