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

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27. Multiple choice question XXVII

1. The waves used in sonography as:

microwaves
ultra-violet waves
ultrasonic waves
sound waves

2. The crack of thunder is heard after few seconds the lightning flash, because:

crack of thunder and lightning are not produced at same time
light travels extremely fast as compared to sound
sound waves slow down on passing through air
none of the above

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