Class 7 Science MCQs (Grade 7) From Textbook
Free Class 7 Science Trivia App Download | Sound Waves e-Book PDF
Class 7 Science MCQs – Practice Test 16 (Chapter 23)
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Sound travels more fast in
Sound cannot travel in vacuum because
Sound created by musical instruments is amplified by
The length of air cutting is changed by
An example of stringed instruments is
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