CBSE  /  Class 12  /  Physics  /  Electromagnetic Waves

  • 1. 
    The dimensional formula of \(\vec{E}\) is:

  • [MLT-2A-1]
  • [MLT-3A-1]
  • [MLT-2A-2]
  • None of these

  • 2. 
    The dimensional formula of is:

  • [MLT-2A-1]
  • [ML0T-2A-1]
  • [ML0T-3A-1]
  • None of these

  • 3. 
    Which of the following has the dimensions of current?

  • ε0 \(\vec{E}\).\(\vec{dt}\)
  • µ0 \(\vec{E}\).\(\vec{dt}\)
  • \(\frac{\vec{B}.\vec{dl}}{µ_0}\)
  • \(\frac{\vec{B}.\vec{dl}}{ε_0}\)

  • 4. 
    Which of the following has the dimensions of charge?

  • \(\frac{ε_0\vec{E}}{\vec{ds}}\)
  • µ0 [latex]\vec{E}\).\(\vec{ds}\)
  • \(\frac{ε_0}{µ_0}\) \(\vec{E}\).\(\vec{ds}\)
  • \(\frac{µ_0}{ε_0}\) \(\vec{E}\).\(\vec{ds}\)

  • 5. 
    Maxwell's equation involving \(\frac{d}{dt}\) \(\vec{B}\) is obtained-from:

  • Ampere's law
  • Gauss's law
  • Faraday's law
  • Biot-Savart's law

  • 6. 
    The dimensions of \(\vec{E}\), \(\vec{dl}\) are identical to that of:

  • potential
  • charge
  • current
  • None of these

  • 7. 
    Which of the following laws was modified by Maxwell by introducing the displacement current?

  • Gauss's law
  • Ampere's law
  • Biot-Savart's law
  • None of these

  • 8. 
    Choose the wave relevant to telecommunication :

  • ultraviolet
  • infrared
  • microwave
  • visible light

  • 9. 
    Electromagnetic waves have a speed of

  • 3 × 105 kms-1
  • 3 × 106 kms-1
  • 3 × 107 kms-1
  • 3 × 108 kms-1

  • 10. 
    Which of the following EMW has highest wavelength?

  • X-ray
  • ultraviolet rays
  • infrared rays
  • microwaves
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