A) 75 dB
B) 55 dB
C) 65 dB
D) 45 dB
Correct Answer: B
Solution :
Noise is the most dangerous pollutant of mans environment. The unit of sound level is decibel. In a residential areas during day time 55 dB of sound is permissible through noise pollution control low. 45 dB of sound is permissible in residential area during night 75 dB of sound is permissible in industrial zone during day time 65 dB of sound is permissible in commercial zone during day time.
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