Q: Which one of the following statements with regard to ultrasonic waves is NOT correct?
(a)Ultrasonic waves have frequency above 20 kHz
(b)Ultrasonic waves are longitudinal waves
(c)Ultrasonic waves can travel through water
(d)Ultrasonic waves can travel through vacuum
Correct Answer: (d)
The correct answer is (d) 'Ultrasonic waves can travel through vacuum'. This question from the General Studies domain tests knowledge of Miscellaneous.