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Railways PYQCBT 1 2016

RRB NTPC · Question 33

Echocardiogram is more closely related to A. Doppler effect B. Zeeman effect C. Photoelectric effect D. Magnetic effect

  1. D

  2. B

  3. C

  4. A

Show answer & explanation

Answer: (D) A

Explanation

An echocardiogram uses ultrasound to image the heart, and Doppler echocardiography uses the Doppler effect (the change in frequency of sound reflected from moving blood) to measure the speed and direction of blood flow through the heart.