Is it true that the defects in a metal block can be detected using ultrasound?

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False

True

answer is A.

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Detailed Solution

The above statement is true.
A detector is installed at one end of the metal, and ultrasound is passed through the other. When the metal is perfect, the ultrasonic waves travel as expected and are thus detected at the other end. When a metal has a flaw, the waves are reflected and thus do not reach the other end. When no detection is received, it is possible to conclude that the metal has a flaw.

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