2. Sample Papers
  3. Railways

Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-30

  • question_answer
    Ultrasonic waves are produced by

    A)  Peltier's effect   

    B)  Piezoelectric effect

    C)  Doppler's effect

    D)  Coulomb's law

    Correct Answer: B

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