Class 7 Science e-Book's MCQs - Complete
Sound Waves and Noise App Quiz & e-Book Download - 126
Apps:
MCQ:
Sound is measured by units that are called
- Hertz (Hz)
- Decibels (dB)
- Meters (m)
- Pascal (Pa)
b
Class 7 Science App & e-Book Tests PDF Download
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7th Grade Science MCQs eBook Download
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