Chapter 24: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 24
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MCQ 91: Who discovered the 'Korotkoff' sounds?
MCQ 92: The parts of sound waves where air pressure is lesser, is known as
MCQ 93: The pleasant sound of music depends on its
MCQ 94: The lowest level of frequency a human ear can detect, is
MCQ 95: We can hear the voice of alarm clock when there is
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