Question

The maximum level of tolerable noise pollution for human being is
A. 60 decibels
B. 70 decibels
C. 80 decibels
D. 100 decibels

Answer 1

Hint: Any unwanted sound that causes annoyance, irritation, and pain to the human ear is termed as noise. Noise is measured in dB unit which indicates the loudness of the sound. Noise level refers to the decibel levels of noise that is produced by any appliance or machine.

Step by step answer:The strength of noise called decibel units (dB) we can measure noise levels with a sound level meter. A logarithmic scale is used to express sound levels meaningfully in numbers that are more manageable, using 10 as the base, rather than a linear one. The decibel scale is called this scale. A whisper is about 30 dB, regular talk is about 60 dB, and it is about 95 dB for a motorcycle engine to run. Noise over 70 dB can start to damage hearing over a sustained period of time. Loud noise above 120 dB will damage ears instantly. So, sound above 80 dB is harmful to the human ear.
Hence, the correct answer is Option C
Additional Information: The allowable noise level in India has been set by the CPCB for various areas. The acceptable maximum in industrial areas is 75 dB during the daytime and 70 dB at night. It is 65 dB and 55 dB in commercial areas, while it is 55 dB and 45 dB in residential neighborhoods during daytime and night, respectively. In addition, there is a category called 'silent zone' that covers areas within 100 meters of schools, colleges, hospitals and courts' premises. In this region, the allowable noise limit is 5.

Note: On the decibel scale, the quietest audible sound (perceived near-absolute silence) is 0 dB. On the decibel scale, the quietest audible sound (perceived near total silence) is 0 dB. A sound 10 times more powerful is 10 dB and so on.