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Q: Man cannot tolerate very high sound, what is the highest sound level that human cannot hear-
  • A. 100dB
  • B. 80dB
  • C. 40 dB
  • D. 115 dB
Correct Answer: Option B - 80 dB is considered the highest safe exposure level for human. The permissible time for safe listening decrease as sound level increase.
B. 80 dB is considered the highest safe exposure level for human. The permissible time for safe listening decrease as sound level increase.

Explanations:

80 dB is considered the highest safe exposure level for human. The permissible time for safe listening decrease as sound level increase.