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Sound — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceSound1 Mark
MCQ
There are some sounds which cannot be heard by human ear. These sounds have frequency, either more than $20\ kHz$ or less than $20Hz$ The sound whose frequency is less than the $20Hz$ is called $...........$
  • A
    Ultrasonic sound
  • ✓
    Infrasonic sound
  • C
    Plane sound
  • D
    Sonic boom
✓

Answer

Correct option: B.
Infrasonic sound

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