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ECAT Physics 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
Electromagnetic waves transport
Choose an answer
Energy only
Momentum only
Both A and B
None is correct
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Question # 3
Light waves are
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Mechanical waves
Electromagnetic waves
Any of above
None of above
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Question # 4
The terms phase difference and path difference are
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Same
Different
Equal
none of these
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Question # 5
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 # 6
In an interference pattern of Young's Double Slit (YDS) experiment
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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 # 7
The appearance of colours in the soap (or oil) film results from
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Dispersion
Interference
Reflection
Refraction
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Question # 8
In YDS experiment, fringe spacing means the distance between two consecutive _________ fringes
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Bright
Dark
Any of A or B
None of these
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Question # 9
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 # 10
Wavelength of light, on the average, is given by
Choose an answer
10
-14
m
10
-10
m
10
-6
m
10
-4
m
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Question # 11
Huygen principle is used to determine
Choose an answer
Speed of light
Location of wavefront
About polarized and unpolarized light
None of them
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Question # 12
In case of constructive interference of two waves, the amplitude of the resultant wave is __________ either of the waves
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Greater than
Equal to
Smaller than
None of these
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Question # 13
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 # 14
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 # 15
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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