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Class 8 Science MCQ App Download - Pitch and Loudness Apps (Android & iOS)

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Pitch and Loudness MCQ App Download & e-Book - 33

MCQ: 33

Sound having frequencies above 20000Hz are called

  1. infrasound
  2. ultrasound
  3. mega sound
  4. micro sound

Class 8 Science App & e-Book Tests PDF Download

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