Chapter 24: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 24
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MCQ 141: The loudness of sound depends on
MCQ 142: Bats also use 'ultrasound' to prevent
MCQ 143: The louder the sound is, the more the amplitude it
MCQ 144: The full name of ultrasound is
MCQ 145: The melting of a metal with the help of ultrasounds is known as
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