Download Class 7 Science Quiz App Download | Sound Waves e-Book PDF
Class 7 Science Study Material: Practice Test 15 (Chapter 23)
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Tiny lumps of solid matter grew in kidney are known as
A device for viewing oscillations by a display on the screen of a cathode ray tube is called
Sound is carried to our ears through
Light travels
One of the three things that affects the sound produced by vibration of string is
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