Class 7 Science MCQs (Grade 7) From Textbook
Free Class 7 Science Quiz App Download | Sound Waves e-Book PDF
Class 7 Science MCQs – Practice Test 31 (Chapter 23)
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The medical use of ultrasound is to detect
The exact speed of sound depends upon
The wave with compressions and rarefactions is known as
Ships use echolocation to measure the
An example of 'percussion' is
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