A) Above 120 dB
B) Above 80 dB
C) Below 30 dB
D) Above 150 dB
Correct Answer: B
Solution :
Unwanted sound is called noise. Above 80 (decibel) dB, sound is considered hazardous noise pollution. Above 150 dB, sound causes damage to hearing, which may be traumatic, Above 120 dB, sound causes irreversible damage. Below 30 dB, sound is quiet.
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