Chapter 24: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 24
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MCQ 146: The louder the sound, the more
MCQ 147: Unwanted or unpleasant sounds are known as
MCQ 148: Some whales produce songs that travel for about
MCQ 149: In air, the speed of sound is
MCQ 150: Bats use ultrasound to find its
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