Class 7 Science e-Book's MCQs - Complete
Sound Absorption MCQs App & e-Book Download - 69
Apps:
MCQ:
In concert halls, soft materials and carpets are used to
- increase sound waves
- absorb sound waves
- retract sound waves
- refract sound waves
b
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Sound Absorption Learning App: Free Download Android & iOS
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7th Grade Science MCQs eBook Download
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