Class 7 Science MCQs - Chapter 23
Sound Waves Quiz Questions & Answers PDF Download - 19
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Sound Waves Exam Questions and Answers PDF Download: Test 19
Who discovered the 'Korotkoff' sounds?
- Isaac Newton
- Dr.Nikolai Korotkoff
- Michael Faraday
- Thomas Silva Edison
The parts of sound waves where air pressure is lesser, is known as
- compression
- rarefaction
- consolation
- expansion
The pleasant sound of music depends on its
- amplitude
- frequency
- wavelength
- volume
The lowest level of frequency a human ear can detect, is
- 2 Hz
- 20 Hz
- 20kHz
- 2kHz
We can hear the voice of alarm clock when there is
- vacuum in the jar
- air in the jar
- liquid in the jar
- space in the jar
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