Railways PYQCBT 1 2020

RRB NTPC · Question 36

Through which of the following mediums sound CANNOT travel?

  1. Vacuum

  2. Milk

  3. Air

  4. Steel

Show answer & explanation

Answer: (A) Vacuum

Explanation

Sound is a mechanical wave and needs a medium of particles; it cannot travel through a vacuum. It travels through solids, liquids and gases.