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Railways PYQCBT 2 2017

RRB NTPC · Question 89

Speeds greater than the speed of sound in air are known as ______.

  1. Supersonic

  2. Solar

  3. Infrasonic

  4. Ultrasonic

Show answer & explanation

Answer: (A) Supersonic

Explanation

Speeds above the speed of sound (about 343 m/s in air) are supersonic. Ultrasonic and infrasonic refer to sound frequencies, not speeds.