Multiple choice

Which of the following is not a use of ultrasonic sound?

  1. To repel mosquitoes and other insects

  2. To scan and get images of inner body parts

  3. To detect cracks in metal blocks

  4. Drum beats for mass drill in a school

  5. In sonars used in ships
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Drum beats for mass drill in a school must be heard by all students. So, it is in the audible frequency range.

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