Acceptable noise level for residential and business urban areas as per IS: 4954-1968 is
- A25-35 dB
- B40-50 dBCorrect
- C50-60 dB
- D70-80 dB
Solution
Concept
Acceptable urban noise levels per Indian standard
Formula
NONE
Step-by-step solution
1. Indian Standard IS: 4954-1968 gives recommendations for noise abatement in town planning. 2. The standard specifies acceptable ambient noise levels based on functional land use. 3. For residential and business urban areas, the recommended acceptable noise level is 40-50 dB. Answer: B
Explanation
Indian Standard IS 4954-1968 specifies guidelines for urban noise control to prevent environmental disturbance in populated zones. For mixed urban areas containing both residences and business establishments, the acceptable outdoor noise limit is designated between 40 and 50 decibels.
Why the other options are wrong
A) 25-35 dB is the acceptable noise level for quiet locations like broadcasting studios and auditoriums. C) 50-60 dB represents commercial area noise levels, exceeding residential limits. D) 70-80 dB corresponds to industrial zones or excessively noisy urban locations.
Shortcut
Acceptable noise level for residential and business urban areas = 40-50 dB.
Common mistake
Confusing urban residential and business noise limits with rural or strictly residential noise standards.
Correct answer: B) 40-50 dB