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 Multiple Choice QuestionsMultiple Choice Questions

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1.

The electric field associated with an electromagnetic wave in vacuum is given by E=i 40 cos (kz-6x108t), where E, z= and t are in volt/m, metre and second respectively. The value of wave vector k is

  • 2 m-1

  • 0.5 m-1

  • 6 m-1

  • 6 m-1

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2.

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is

  • the frequency of the microwave must match the resonant frequency of the water molecules

  • the frequency of the microwave has no relation  with natural frequency of water molecules

  • microwave are heat waves, so always produce heating 

  • microwave are heat waves, so always produce heating 

673 Views

3.

The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is

  • gamma rays, ultraviolet, infrared, microwaves

  • microwaves, gamma rays, infrared, ultraviolet

  • infrared, microwave, ultraviolet, gamma rays.

  • infrared, microwave, ultraviolet, gamma rays.

519 Views

4.

The energy of the EM waves is of the order of 15 keV. To which part of the spectrum does it belong?

  • X - rays

  • infrared rays

  • Ultraviolet rays

  • Ultraviolet rays

810 Views

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5.

The velocity of electromagnetic radiation in a medium of permittivity straight epsilon subscript straight o and permeability straight mu subscript straight o is given by

  • square root of epsilon subscript o over mu subscript o end root
  • square root of straight mu subscript straight o straight epsilon subscript straight o end root
  • fraction numerator 1 over denominator square root of straight mu subscript straight o straight epsilon subscript straight o end root end fraction
  • fraction numerator 1 over denominator square root of straight mu subscript straight o straight epsilon subscript straight o end root end fraction
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6.

The electric and magnetic field of an electromagnetic wave are:

  • in phase and parallel to each other

  • in opposite phase and perpendicular to each other

  • in opposite phase and parallel to each other

  • in opposite phase and parallel to each other

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7.

X-rays are

  • electromagnetic radiation

  • stream of electron

  • stream of proton

  • stream of uncharged particle


8.

Who discovered X-rays?

  • Roentgen

  • Madam Curie

  • Rutherford

  •  All of these


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9.

If  λν,  λx and  λmrepresent the wavelengths of visible light, X-rays and microwaves respectively, then

  • λ m > λ x >  λ ν

  • λv >λm > λx

  • λm> λv > λx

  • λv >  λx >  λm


10.

In gamma ray emission from a nucleus

  • both the neutron number and the proton number change

  • there is no change in the proton number and the neutron number

  • only the neutron number changes

  • only the proton number changes


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