Class 7 Science MCQs - Chapter 23
Sound Waves Multiple Choice Questions (MCQs) PDF Download - 9
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The MCQ: Measure of decibel starts from; "Sound Waves" App Download (Free) with answers: 20, 0, 20000, and 10 to study distance learning courses. Solve Sound Waves and Noise MCQ Questions, download Google eBook (Free Sample) for online school classes.
Sound Waves MCQs with Answers PDF Download: Quiz 9
Measure of decibel starts from
- 0
- 20
- 20000
- 10
The mixture of high and low sounds is called a
- rhythm
- bass effect
- beat effect
- wow effect
Echoes are formed when sound
- strikes a wall and reflects back
- strikes a wall and is absorbed
- hits the eardrum repeatedly
- breaks
The use of echo to measure distance is known as
- echo destination
- echolocation
- echo displacement
- echo dictation
In a flute, the length of air cutting through the holes is changed by
- changing length
- changing valves
- fingers
- sealers
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