Class 7 Science MCQs (Grade 7) From Textbook
Sound Waves Quiz App Free Download | Class 7 Science e-Book PDF
Class 7 Science Certification MCQs – Practice Test 3 (Chapter 23)
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Like light, sound cannot
A drum makes sound of
An example of longitudinal wave is
20 dB has hundred times more energy than
'Eardrum' bursts at
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