Question

To comply with Noise Pollution (Regulation and Control) Rules 2000, the standards for noise for day and night time are given. Which of the given area codes have correct limits?

• A. A and D
• B. B Only
• C. A and C
• D. C Only

Hint:

Important noise limits: Industrial \(75/70\), Commercial \(65/55\), Residential \(55/45\), Silence zone \(50/40\) for day/night.

Answer 1

The Correct Option is C

Concept: Noise standards are different for industrial, commercial, residential, and silence zones. The permissible noise level is generally higher during daytime and lower during nighttime.

Step 1: Recall the correct noise limits.
For industrial area, the correct standard is: \[ 75 \text{ dB during day}, \quad 70 \text{ dB during night} \] For residential area, the correct standard is: \[ 55 \text{ dB during day}, \quad 45 \text{ dB during night} \]

Step 2: Check area code A.
Area code A represents industrial area with 75 dB in daytime and 70 dB at night. \[ A = \text{Correct} \]

Step 3: Check area code C.
Area code C represents residential area with 55 dB in daytime and 45 dB at night. \[ C = \text{Correct} \]

Step 4: Identify incorrect entries.
The commercial and silence zone values given in the table are not correct according to standard limits. Therefore, the correct answer is A and C.