Quiz  /  MCQ On Electromagnetic Wave With Answers

  • 1. 
    Electromagnetic waves are produced by

  • Electromagnetic waves are transverse in nature. The electric and magnetic field are perpendicular to each other.
  • Accelerated charges produce electromagnetic waves.
  • These waves travel at a constant velocity of 3 x 10
  • m/s in a vacuum.
  • Electromagnetic waves do not require a medium to travel.
  • The frequency of the wave remains unchanged but wavelength changes when it travels from one medium to another.
  • It follows the law of superposition.
  • The oscillating electric and magnetic fields are in phase and their magnitudes have a constant ratio.
  • The electric energy is equal to the magnetic energy in electromagnetic waves.
  • The Poynting vector represents the energy transferred by electromagnetic waves per unit area.

  • 2. 
    The direction in which electromagnetic waves propagate is the same as that of

  • A static charge
  • An accelerated charge
  • A moving charge
  • Charged particles

  • 3. 
    In an electromagnetic wave in free space, the root mean square value of the electric field is 6 V/m. The peak value of the magnetic field is

  • zero
  • π/2
  • π
  • π/3

  • 4. 
    Which of the following can be used to produce a propagating electromagnetic wave?

  • 2.83 x 10
  • T
  • 1.51 x 10
  • T
  • 0.80 x 10
  • T
  • 4 x 10
  • T

  • 5. 
    To which part of the spectrum does EM waves belong if the energy of the wave is of the order of 15 KeV.

  • Charge moving at a constant speed
  • Chargeless particle
  • Stationary charge
  • An accelerating charge

  • 6. 
    The ratio of the amplitude of the magnetic field to the amplitude of the electric field for electromagnetic wave propagation in a vacuum is equal to

  • X rays
  • Infrared rays
  • Ultraviolet rays
  • Gamma rays

  • 7. 
    Which properties amount the following is false about electromagnetic waves?

  • Unity
  • Speed of light in vacuum
  • Reciprocal of the speed of light in vacuum
  • The ratio of magnetic permeability to electrical susceptibility in a vacuum.

  • 8. 
    Which of the following rays are not electromagnetic waves?

  • The energy in an electromagnetic wave is divided equally between electric and magnetic vectors.
  • Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave.
  • These waves do not require any material medium for propagation
  • Both electric and magnetic field vectors attain the maxima and minima at the same place and the same time
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