Class 7 Science MCQs (Grade 7) From Textbook

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Class 7 Science Learning Guide: Certification Test 1502

Musical Instruments MCQs App & e-Book: MCQ 1502

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MCQ: 1502

Wind instruments make sound by allowing air to

  1. cut through the tubes
  2. vibrate through the tubes at different lengths
  3. increase the frequency
  4. decrease the frequency
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