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Mr. Dubey • 100.64K Points
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Q. Ultrasonic testing is:

  • (A) Mechanical energy with a speed of propagation faster than the speed of sound
  • (B) Sound which has a frequency or pitch above the range of the human ear
  • (C) The science of discontinuity detection using ultrasonic sound
  • (D) Mechanical vibrations below the frequency of human hearing
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