Chapter 24: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 24
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MCQ 116: In water the speed of sound is
MCQ 117: An example of 'percussion' is
MCQ 118: The number of sound waves sent per second is known as
MCQ 119: Sound travels faster in liquids than air because
MCQ 120: Echoes are useful for bats because through it bats can detect
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