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Railways PYQCBT 1 2016

RRB NTPC · Question 11

What is the noise level of normal conversation? A. About 60 dB B. About 70 dB C. About 80 dB D. About 90 dB

  1. C

  2. A

  3. B

  4. D

Show answer & explanation

Answer: (B) A

Explanation

Normal conversation between two people is about 60 decibels (dB). For comparison, a whisper is about 30 dB, heavy traffic about 85 dB, and sounds above 85 dB can damage hearing with long exposure.