A) 50 dB
B) 70 dB
C) 20 dB
D) 40 dB
Correct Answer: A
Solution :
Human ear can hear a frequency of 500 to 5000 Hertz, sound energy is measured in terms of untis called decibel (dB). Sound in our city homes (silent zone) during day time averages 40-50 dB, but street noise average 70-80 dB. Sounds upto 80 dB are considered bearable by -an, but higher sound intensity are hazardous, musing nervous stress, irritability, increased blood pressure etc.
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