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Q: Which of the following is NOT electromagnetic wave?
  • A. Radio
  • B. Infra-red
  • C. Microwave
  • D. Ultrasound
Correct Answer: Option D - Electromagnetic spectrum consists of radio waves, microwaves, infrared waves, visible spectrum, ultraviolet waves, X-rays and Gamma rays. It does not include ultrasound. Sound wave is not an electromagnetic wave. It is a mechanical wave. When sound wave propagates, particles of the medium oscillate along the direction of propagation of the wave.
D. Electromagnetic spectrum consists of radio waves, microwaves, infrared waves, visible spectrum, ultraviolet waves, X-rays and Gamma rays. It does not include ultrasound. Sound wave is not an electromagnetic wave. It is a mechanical wave. When sound wave propagates, particles of the medium oscillate along the direction of propagation of the wave.

Explanations:

Electromagnetic spectrum consists of radio waves, microwaves, infrared waves, visible spectrum, ultraviolet waves, X-rays and Gamma rays. It does not include ultrasound. Sound wave is not an electromagnetic wave. It is a mechanical wave. When sound wave propagates, particles of the medium oscillate along the direction of propagation of the wave.