PUMPA - SMART LEARNING

எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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25. Multiple choice question XXV

1. A bullet is moving at a speed, more than the speed of sound. It is said to be moving at:

supersonic speed
ultrasonic speed
infrasonic speed
sonic speed

2. Naval ships called "destroyers" can detect submarines in the sea. The device used by these ships is called:

ultra sonometer
sonar
ultrasonograph
none of the above

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