Q25 of 199 Page 206

Name the principle on which a soundboard works.

The principle on which a soundboard works is reflection of sound.


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23

What is the name if the device which is used to find the depth of sea (or ocean) by using ultrasonic sound waves?

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Write the full name of ‘SONAR’.

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Name the device which is used to address a small gathering of people.

 27

Name the device used by doctors to listen to our heartbeats.