Class 7 Science MCQ App Download | All Around Sounds MCQ e-Book PDF
Class 7 Science MCQs (Grade 7) From Textbook

Class 7 Science MCQs – Certification Test 323

All Around Sounds MCQ (Question 323) – App & e-Book Download

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MCQ 323: Vibrations are caused due to:

  1. change of temperature of air
  2. change of pressure in air
  3. effect of humidity on air
  4. level of heat in air
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