Correct Answer is : Sound waves of frequency greater than 20kHz

sound waves of frequency less than 20 {kHz}

Sound waves of frequency greater than 20 {kHz}

Sound waves of frequency between 20 {Hz} and 20 {KHz}

None of the above/More than one of the above

BPSC 65th Re Prelims Exam 17 Feb 2020 Solved Paper

Question : 10 of 150

Marks: +1, -0

Ultrasonic waves are

Solution:

Ultrasonic wave is defined as "inaudible sound with high frequency for human" the frequency of which generally exceeds

20 {kHz}

. Sound wave which is not intended to be heard is also called ultrasonic wave.

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