What is the maximum permissible limit of daily exposure to noise level without causing damage to hearing?: (A) 80 dB, (B) 85 dB, (C) 90 dB, (D) 95 dB
Answer is B. Exposure to noise above 160 dB cause ruptures of the tympanic membrane. dB is unit of intensity of sound. For frequency unit is Hz Ref : Park 23rd edition Pgno : 742