EDUCATION (CBSE/UGC NET)

Detailed explanation-1: -In industrial areas, the permissible limit is 75 dB for daytime and 70 dB at night. In commercial areas, it is 65 dB and 55 dB, while in residential areas it is 55 dB and 45 dB during daytime and night respectively.

Detailed explanation-2: -Hence, the correct answer is ‘55/45 dB’.

Detailed explanation-3: -According to the Committee on Noise Pollution Control, the noise pollution decibel limit permitted in residential areas is 45 dB at night and 55 dB during the day. Daytime is defined as 6:00 AM to 10:00 PM. Nighttime is defined as 10:00 PM to 6:00 AM.

Detailed explanation-4: -The permissible maximum sound level limit for the silent zone is 50 decibels during the daytime. The acceptable limit for night hours is 40 decibels. So, the correct answer is, ‘50 dB’. Note: The allowable noise level in India has been set by the CPCB for various areas.

Detailed explanation-5: -The permissible levels for noise exposure for work zone area have been prescribed under the Model Rules of the Factories Act, 1948, as given in the Tables below. : 1.No exposure in excess of 140 dB peak sound pressure level is permitted.