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Railways PYQCBT 1 2016

RRB NTPC · Question 24

Sound waves cannot travel in: A. Air B. Water C. Vacuum D. Steel

  1. B

  2. A

  3. C

  4. D

Show answer & explanation

Answer: (C) C

Explanation

Sound is a mechanical wave and needs a medium (solid, liquid or gas). It cannot travel through a vacuum.