Discussion
Match List-I and List-II containing different areas/zones and ambient levels of noise in night time :
| List I (Category of Area/Zone) | List II (Night time Noise Limits in db) |
|---|---|
| (a) Commercial Area | (i) 40 |
| (b) Industrial Area | (ii) 45 |
| (c) Silent Zone | (iii) 55 |
| (d) Residential Zone | (iv) 70 |
Choose the correct answer from the options given below :
Answer: C
The correct match is a-iii, b-iv, c-i, d-ii.
The Noise Pollution (Regulation and Control) Rules, 2000 set ambient limits in dB(A) Leq for day and night:
| Zone | Day | Night |
|---|---|---|
| Industrial | 75 | 70 |
| Commercial | 65 | 55 |
| Residential | 55 | 45 |
| Silence zone | 50 | 40 |
So commercial is 55 (iii), industrial 70 (iv), silent zone 40 (i) and residential 45 (ii). The option with silent zone 45 and residential 40 swaps the two quietest zones. The options giving commercial areas 70 confuse them with industrial areas.
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