Physics MCQs for Punjab PSC Exam Part 1

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Which of the following is not an electromagnetic wave.

  1. X-rays
  2. Alpha-rays
  3. Gamma-rays
  4. Light rays


Electromagnetic waves of wave length ranging from come under.

  1. X-rays
  2. UV region
  3. Visible region
  4. Infra-red region


Electromagnetic theory suggests that the light consists of

  1. Magnetic vector alone.
  2. Electric vector alone.
  3. Electric and magnetic vectors perpendicular to each other.
  4. Parallel electric and magnetic vector.


The frequency of radio waves corresponding to a wave length of 10 m is


The electromagnetic waves travel with velocity of

  1. Sound
  2. Light
  3. Greater than that of light
  4. Greater than that of sound


The existence of EM waves were experimentally confirmed by

  1. Maxwell
  2. Faraday
  3. Hertz
  4. Tesla


The back emf in a DC motor is maximum when

  1. The motor has picked up maximum speed.
  2. The motor has just started moving.
  3. The speed of motor is still on increase.
  4. The motor has just been switched off.


AC measuring instrument measures

  1. Peak value
  2. Rms value
  3. Any value
  4. Average value


The Q-factor of a resonant circuit is equal to

  1. 1CWR
  2. 1WL
  3. CWR
  4. fCW

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