Question

dB is a standard abbreviation used for the quantitative expression of?
A.A particular pollutant
B.The dominant Bacillus in a culture
C.A certain pesticide
D.The density of bacteria in a medium.

Answer 1

The level of Sound should be maintained to normal which is important in our day to day life . Increase in sound causes noise. Noise can be calculated by various methods.

Complete answer:
1.dB stands for decibel. It is an atypical abbreviation used for the quantitative expression of sound level. It is used for measuring relative loudness of the sound.
2.It’s high levels correspond to noise pollution.
3.Noise is an unwanted sound which is unpleasant or disruptive.
4.Noise or pollutant sound features a value of 80 dB and above, it harms the hearing system.
5.The WHO has fixed 45 dB sound because of the safe background level for a community.
6.Some of the noise level with the example
Jet plane noise = 120 db.
Gun shot = 130 db.
Quiet place= 50 db.
7.Hence the correct answer is A because the sound and noise both vibrates through medium and the medium is a particular pollutant through which sounds pass. Greater the vibration through medium, greater Is the noise.
Additional information:
As we know sound is vibration that propagates as an acoustic wave via a transmission medium such as gas, liquid or solid.
It can also be defined as wave motion in air or other elastic media. It is something that can be viewed as an excitation factor of the hearing mechanism that causes perception of sound.

Hence the correct answer is option(A)

Note: Particulate pollutants - A particulate pollutant may be a macroscopic or microscopic liquid and solid particles present within the sort of the suspension within the air. Particulate matter is often released from differing types of human activities like vehicle emissions, smoke particles, dust particles, and ash from industries.