Class 7 Science Online Tests
Sound Waves and Noise MCQ (Multiple Choice Questions) PDF Download
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Sound Waves and Noise MCQs: Questions and Answers PDF Download
Sound is measured by units that are called
- Hertz (Hz)
- Decibels (dB)
- Meters (m)
- Pascal (Pa)
20 dB has hundred times more energy than
- 10 dB
- 0 dB
- 5 dB
- 2 dB
'Eardrum' bursts at
- 40 dB
- 80 dB
- 160 dB
- 320 dB
The level of sound of normal conversation is
- 10 dB
- 20 dB
- 50 dB
- 60 dB
Loud noise can
- damage our ears
- make us ill
- disturb our sleep
- interrupt conversation
Class 7 Science Practice Tests
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