Class 8 Science MCQs (Grade 8) From Textbook

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Class 8 Science MCQs – Certification Test 33

Pitch and Loudness Trivia (Question 33) – App & e-Book Download

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MCQ: 33

Sound having frequencies above 20000Hz are called

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

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