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Railways PYQCBT 1 2016

RRB NTPC · Question 3

What is the unit of measurement of sound? A. Newton B. Decibel C. Sones D. Phons

  1. B

  2. A

  3. D

  4. C

Show answer & explanation

Answer: (A) B

Explanation

The loudness (sound intensity level) of sound is measured in decibels (dB), named after Alexander Graham Bell.