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: Noise standards in India (IS:4954–1964).
The Bureau of Indian Standards (IS:4954–1964) provides guidelines for acceptable ambient noise levels in different areas: - Industrial areas: 75–95 dB
- Commercial areas: 55–65 dB
- Residential areas: 35–45 dB
- Silence zones: below 40 dB

Step 2: Match with options.
For urban residential areas, the prescribed range = 35–45 dB.

Step 3: Eliminate wrong options.
- (B) 65–75 → Too high, applies to industrial. ✗
- (C) 20–30 → Too low, not practical for urban areas. ✗
- (D) 15–25 → Silent library standards, not residential. ✗

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