Home PYQs UPPSC UPPSC MCQs Prelims 2012 (GS Paper I)

Question

Ultrasonics are sound waves of frequency:

  1. Greater than 20, 000 Hz
  2. Less than 10, 000 Hz
  3. Equal to 1000 Hz
  4. None of these

Answer:

Option A: Greater than 20, 000 Hz

Detailed Solution:

The correct answer is “Greater than 20, 000 Hz”.

Ultrasonic sound waves have frequencies above 20,000 hertz (Hz), or 20 kilohertz (kHz), which is the upper limit of human hearing.