Class 7 Science MCQs (Grade 7) From Textbook
Class 7 Science Quiz App | Sound Waves e-Book PDF Download
Class 7 Science MCQs – Practice Test 7 (Chapter 23)
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Singing and talking are the
In large empty rooms, even a click keeps on
Sounds of thunder and horn of lorries are known as
Sound is created by our vocal cord due to
The normal value of decibel that our ears can detect is
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