Physics MCQs for Competitive Exams Part 1

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Question:

Which of the following is not an electromagnetic wave.

  1. X-rays

  2. Alpha-rays

  3. Gamma-rays

  4. Light rays

Question:

Electromagnetic waves of wave length ranging from come under.

  1. X-rays

  2. UV region

  3. Visible region

  4. Infra-red region

Question:

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.

Question:

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

Question:

The electromagnetic waves travel with velocity of

  1. Sound

  2. Light

  3. Greater than that of light

  4. Greater than that of sound

Question:

The existence of EM waves were experimentally confirmed by

  1. Maxwell

  2. Faraday

  3. Hertz

  4. Tesla

Question:

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.

Question

AC measuring instrument measures

  1. Peak value

  2. Rms value

  3. Any value

  4. Average value

Question:

The Q-factor of a resonant circuit is equal to

  1. 1CWR

  2. 1WL

  3. CWR

  4. fCW