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JEE Questions for Physics Electromagnetic Waves Quiz 4 - MCQExams.com
JEE
Physics
Electromagnetic Waves
Quiz 4
The frequency of electromagnetic wave having wavelength 25mm is ____________ Hz
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0%
0%
2)
0%
0%
Unit of energy density of electromagnetic wave is _____________
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0%
0%
2)
0%
0%
None of these
What is the ratio of velocities of light rays of wavelengths 4000
o
A and 8000
o
A in vacuum ?
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1 : 2
0%
1 : 1
0%
2 : 1
0%
cannot be determined
Which of the following rays are not electromagnetic waves?
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α rays
0%
γ rays
0%
β rays
0%
heat rays
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0%
0.25
0%
0.5
0%
0.75
0%
1
Our eyes respond to wavelength ranging from
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400nm to 700nm
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2)
0%
1mm to 700nm
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700nm to 800nm
In microwave oven, we use electromagnetic oscillators which produce electromagnetic waves in the wavelength range
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1mm to 10m
0%
0.7 μm to 1mm
0%
0.1 m to 1mm
0%
0.1 μm to 0.7 μm
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0%
0%
2)
0%
same as the direction of propagation of electromagnetic wave
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none of these
The wavelength of x rays is of the order of
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1cm
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1m
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1micron
0%
1angstrom
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0%
2)
0%
0%
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0%
0%
2)
0%
0%
Light with an energy flux of w/m
3
or Wm
–3
falls on a non-reflecting surface at normal to surface. If the surface has an area of 20m
2
. The average force exerted on the surface during 30 minutes is ______________
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0%
2)
0%
0%
Energy density of an electromagnetic wave of intensity 0.02 Wm
–2
is ________________
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0%
2)
0%
0%
None of the above
The waves used in communication are generally called
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γ rays
0%
α rays
0%
Microwaves
0%
Radiowaves
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0
0%
2)
0%
0%
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0%
0%
2)
0%
0%
The electric and magnetic field of an electromagnetic wave are
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in phase and perpendicular to each other
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in phase and parallel to each other
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in opposite phase and perpendicular to each other
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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
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A is correct, B is wrong
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B is correct, A is wrong
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Both A and B are correct
0%
Both A and B are wrong
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0%
2)
0%
0%
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0%
2)
0%
0%
The frequency of light wave of wavelength 5000
o
A is ________________Hz
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0%
0%
2)
0%
1.5
0%
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Current
0%
Resistance
0%
Electric charge
0%
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 ____________
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0%
0%
2)
0%
0%
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along – ve Y direction
0%
along + ve Y direction
0%
along + ve X direction
0%
along – ve X direction
Relation between amplitudes of electric and Magnetic field is..............
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0%
0%
2)
0%
0%
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36.6m
0%
42.3m
0%
40.5m
0%
50.9m
The velocity of light in vacuum can be changed by changing _____________
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Frequency
0%
Wavelength
0%
Amplitude
0%
None of these
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0%
0%
2)
0%
0%
None of these
If the wavelength of light is 4000
o
A then the number of waves in 1mm length will be _________
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2.5
0%
2500
0%
250
0%
25000
The SI unit of displacement current is ________
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0%
Coulomb
0%
Henry
0%
Ampere
0%
Faraday
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