What is the principle behind ultrasonic flaw detection in metal blocks?

Type: MCQ • Marks: 1

A. Ultrasound reflects back from internal cracks or defects, showing discontinuities on a cathode ray screen

B. X-ray fluorescence

C. Magnetic resonance

D. Color change

Explanation

Discontinuities reflect ultrasonic pulses prematurely, revealing structural flaws.

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Class 9th Science (MCQ)

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