Magnetostriction Effect and Magnetostriction Generator

6.	What is the other name for ultrasonic flaw detector?

	A.	Destructive testing
	B.	Magnetostrictive testing
	C.	Non-destructive testing
	D.	Echo testing

7.	An ultrasound pulse sent by a source in sea is reflected by a submerged target at a distance 597.50m and reaches the source after 0.83seconds. Find the velocity of sound in sea water.

	A.	495.925m/s
	B.	719.879m/s
	C.	110m/s
	D.	1439.75m/s

	Answer: Option C


	Explanation:
	Whenever there is a change in medium, then the ultrasonic waves will be reflected. Thus, from the intensity of the reflected echoes, the flaws are detected without destroying the material and hence this method is known as a non-destructive testing method.
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	Tutorial Link:

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