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Q:

The maximum limit in decibels of sound intensity above which a person cannot hear—

  • 1
    50 db
  • 2
    70 db
  • 3
    85 db
  • 4
    120 dB
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Answer : 4. "120 dB"
Explanation :

For short durations of time, sounds up to a 120 dB are bearable and also considered safe by the world health organization, but again, listening to sounds at such high frequencies at regular intervals of stretched time durations is totally unsafe and makes the ears vulnerable to permanent hearing loss.

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