Question

As per IS:4954 – 1964, the acceptable noise level (in dB) for urban residential areas is \underline{\hspace{2cm}}.

• A. 35–45
• B. 65–75
• C. 20–30
• D. 15–25

Hint:

Always remember: Residential = 35–45 dB, Commercial = ~55–65 dB, Industrial = 75+ dB.

Answer 1

The Correct Option is A

Step 1: Indian Noise Standards (IS:4954–1964).
The Bureau of Indian Standards, per IS:4954–1964, specifies acceptable ambient noise levels for various zones: - Industrial areas: 75–95 dB
- Commercial areas: 55–65 dB
- Residential areas: 35–45 dB
- Silence zones: below 40 dB

Step 2: Compare with options.
The established range for urban residential areas is 35–45 dB.

Step 3: Eliminate incorrect options.
- (B) 65–75 dB → Excessive for residential; applicable to industrial zones. ✗
- (C) 20–30 dB → Impractically low for urban environments. ✗
- (D) 15–25 dB → Represents silent library conditions, not residential. ✗

Final Answer: \[\boxed{35–45 \; \text{dB}}\]