When ultrasonic waves are passed through a solid metal block, it is received fully by the ultrasonic detectors placed at the other end of the block, it implies that -

Metal block is defective

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Metal block is free from cracks

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Metal block is having higher density

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Metal block does not reflect sound

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Solution

The correct option is B Metal block is free from cracks

Ultrasonic waves are reflected from a part of the block. So, this metal block is defective.

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