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Online Tests
Physics ECAT Pre Engineering Chapter 10 Optical Instruments Online Test MCQs With Answers
Question # 1
Speed of light in vacuum depends upon
Choose an answer
Frequency
Wavelength
Amplitude
None of these
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Question # 2
Angle between ray of light and the corresponding wavefront is
Choose an answer
0
0
60
0
90
0
120
0
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Question # 3
Monochromatic light means wave of
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Same frequency
Same colour
Same Wavelength
All of them
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Question # 4
Which one of the followings can act approximately as a source of monochromatic light
Choose an answer
Neon lamp
Fluorescent tube
Sodium lamp
None of these
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Question # 5
Frequency of red colour as compared to that of violet colour is
Choose an answer
Equal
Smaller
Greater
None of these
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Question # 6
Huygen's principle states that
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Light travels in straight line
Light has dual nature
Either of these
None of these
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Question # 7
Two sources are said to be coherent if they have
Choose an answer
Same amplitude
Same wavelength
Definite phase relation with each other
None of them
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Question # 8
The wave nature of light was proposed by
Choose an answer
Newton
Thomas Young
Huygen
None of these
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Question # 9
In an interference pattern of Young's Double Slit (YDS) experiment
Choose an answer
Bright fringes are wider than dark fringes
Dark fringes are wider than bright fringes
Both dark and bright fringes are of equal width
Central fringes are wider than the outer fringes
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Question # 10
A line which represents the direction of travel of a wave is known as
Choose an answer
Spherical wavefront
Locus
Ray
Either B or C
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Question # 11
The terms phase difference and path difference are
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Same
Different
Equal
none of these
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Question # 12
When the source of light is at very large distance, the shape of wavefront is
Choose an answer
Spherical
Cylindrical
Plane
None of these
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Question # 13
The speed of the secondary wavelets as mentioned in Huygen's principle is ________ the speed of propagation of the wave itself
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Equal to
Greater than
Smaller than
None of these
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Question # 14
In case of point source of light, shape of wavefront is
Choose an answer
Spherical
Cylindrical
Plane
None of above
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Question # 15
Electromagnetic waves transport
Choose an answer
Energy only
Momentum only
Both A and B
None is correct
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