JEE Questions for Physics Electromagnetic Waves Quiz 4 - MCQExams.com

The frequency of electromagnetic wave having wavelength 25mm is ____________ Hz

  • Physics-Electromagnetic Waves-69838.png
  • 2)
    Physics-Electromagnetic Waves-69839.png

  • Physics-Electromagnetic Waves-69840.png

  • Physics-Electromagnetic Waves-69841.png
Unit of energy density of electromagnetic wave is _____________

  • Physics-Electromagnetic Waves-69842.png
  • 2)
    Physics-Electromagnetic Waves-69843.png

  • Physics-Electromagnetic Waves-69844.png
  • None of these
What is the ratio of velocities of light rays of wavelengths 4000oA and 8000oA in vacuum ?
  • 1 : 2
  • 1 : 1
  • 2 : 1
  • cannot be determined
Which of the following rays are not electromagnetic waves?
  • α rays
  • γ rays
  • β rays
  • heat rays

Physics-Electromagnetic Waves-69845.png
  • 0.25
  • 0.5
  • 0.75
  • 1
Our eyes respond to wavelength ranging from
  • 400nm to 700nm
  • 2)
    Physics-Electromagnetic Waves-69846.png
  • 1mm to 700nm
  • 700nm to 800nm
In microwave oven, we use electromagnetic oscillators which produce electromagnetic waves in the wavelength range
  • 1mm to 10m
  • 0.7 μm to 1mm
  • 0.1 m to 1mm
  • 0.1 μm to 0.7 μm

Physics-Electromagnetic Waves-69847.png

  • Physics-Electromagnetic Waves-69848.png
  • 2)
    Physics-Electromagnetic Waves-69849.png
  • same as the direction of propagation of electromagnetic wave
  • none of these
The wavelength of x rays is of the order of
  • 1cm
  • 1m
  • 1micron
  • 1angstrom

Physics-Electromagnetic Waves-69850.png

  • Physics-Electromagnetic Waves-69851.png
  • 2)
    Physics-Electromagnetic Waves-69852.png

  • Physics-Electromagnetic Waves-69853.png

  • Physics-Electromagnetic Waves-69854.png

Physics-Electromagnetic Waves-69855.png

  • Physics-Electromagnetic Waves-69856.png
  • 2)
    Physics-Electromagnetic Waves-69857.png

  • Physics-Electromagnetic Waves-69858.png

  • Physics-Electromagnetic Waves-69859.png
Light with an energy flux of w/m3 or Wm–3 falls on a non-reflecting surface at normal to surface. If the surface has an area of 20m2. The average force exerted on the surface during 30 minutes is ______________

  • Physics-Electromagnetic Waves-69860.png
  • 2)
    Physics-Electromagnetic Waves-69861.png

  • Physics-Electromagnetic Waves-69862.png

  • Physics-Electromagnetic Waves-69863.png
Energy density of an electromagnetic wave of intensity 0.02 Wm–2 is ________________

  • Physics-Electromagnetic Waves-69864.png
  • 2)
    Physics-Electromagnetic Waves-69865.png

  • Physics-Electromagnetic Waves-69866.png
  • None of the above
The waves used in communication are generally called
  • γ rays
  • α rays
  • Microwaves
  • Radiowaves

Physics-Electromagnetic Waves-69867.png
  • 0
  • 2)
    Physics-Electromagnetic Waves-69868.png

  • Physics-Electromagnetic Waves-69869.png

  • Physics-Electromagnetic Waves-69870.png

Physics-Electromagnetic Waves-69871.png

  • Physics-Electromagnetic Waves-69872.png
  • 2)
    Physics-Electromagnetic Waves-69873.png

  • Physics-Electromagnetic Waves-69874.png

  • Physics-Electromagnetic Waves-69875.png
The electric and magnetic field of an electromagnetic wave are
  • in phase and perpendicular to each other
  • in phase and parallel to each other
  • in opposite phase and perpendicular to each other
  • in opposite phase and parallel to each other
The direction of electric and magnetic vector for an electromagnetic wave travelling along X-axis are shown in fig. A and B then
Physics-Electromagnetic Waves-69876.png
  • A is correct, B is wrong
  • B is correct, A is wrong
  • Both A and B are correct
  • Both A and B are wrong

Physics-Electromagnetic Waves-69877.png

  • Physics-Electromagnetic Waves-69878.png
  • 2)
    Physics-Electromagnetic Waves-69879.png

  • Physics-Electromagnetic Waves-69880.png

  • Physics-Electromagnetic Waves-69881.png

Physics-Electromagnetic Waves-69882.png

  • Physics-Electromagnetic Waves-69883.png
  • 2)
    Physics-Electromagnetic Waves-69884.png

  • Physics-Electromagnetic Waves-69885.png

  • Physics-Electromagnetic Waves-69886.png
The frequency of light wave of wavelength 5000o A is ________________Hz

  • Physics-Electromagnetic Waves-69887.png
  • 2)
    Physics-Electromagnetic Waves-69888.png
  • 1.5

  • Physics-Electromagnetic Waves-69889.png

Physics-Electromagnetic Waves-69890.png
  • Current
  • Resistance
  • Electric charge
  • Velocity
The amplitude of the magnetic field part of an electromagnetic wave in vacuum is Bm = 510 nT. Then the amplitude of the electric part of the wave is ____________

  • Physics-Electromagnetic Waves-69891.png
  • 2)
    Physics-Electromagnetic Waves-69892.png

  • Physics-Electromagnetic Waves-69893.png

  • Physics-Electromagnetic Waves-69894.png

Physics-Electromagnetic Waves-69895.png
  • along – ve Y direction
  • along + ve Y direction
  • along + ve X direction
  • along – ve X direction
Relation between amplitudes of electric and Magnetic field is..............

  • Physics-Electromagnetic Waves-69896.png
  • 2)
    Physics-Electromagnetic Waves-69897.png

  • Physics-Electromagnetic Waves-69898.png

  • Physics-Electromagnetic Waves-69899.png

Physics-Electromagnetic Waves-69900.png
  • 36.6m
  • 42.3m
  • 40.5m
  • 50.9m
The velocity of light in vacuum can be changed by changing _____________
  • Frequency
  • Wavelength
  • Amplitude
  • None of these

Physics-Electromagnetic Waves-69901.png

  • Physics-Electromagnetic Waves-69902.png
  • 2)
    Physics-Electromagnetic Waves-69903.png

  • Physics-Electromagnetic Waves-69904.png
  • None of these
If the wavelength of light is 4000o A then the number of waves in 1mm length will be _________
  • 2.5
  • 2500
  • 250
  • 25000
The SI unit of displacement current is ________
  • Coulomb
  • Henry
  • Ampere
  • Faraday
0:0:1


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