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Online Tests
Physics ECAT Pre Engineering Chapter 10 Optical Instruments Online Test MCQs With Answers
Question # 1
Light waves are
Choose an answer
Mechanical waves
Electromagnetic waves
Any of above
None of above
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Question # 2
Huygen principle is used to determine
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Speed of light
Location of wavefront
About polarized and unpolarized light
None of them
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Question # 3
Wavelength of light, on the average, is given by
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10
-14
m
10
-10
m
10
-6
m
10
-4
m
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Question # 4
The locus of all the points in the same phase of vibration is called
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Wave pocket
Wavefront
Wave number
None of these
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Question # 5
Speed of light in vacuum depends upon
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Frequency
Wavelength
Amplitude
None of these
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Question # 6
Wavelength of red colour as compared to that of violet colour is
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Smaller
Longer
Equal
None of these
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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
Angle between ray of light and the corresponding wavefront is
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0
0
60
0
90
0
120
0
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Question # 9
In case of destructive interference of two waves, the amplitude of the resultant wave will be __________ either of the waves.
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Greater than
Smaller than
Equal to
None of these
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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
When the source of light is at very large distance, the shape of wavefront is
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Spherical
Cylindrical
Plane
None of these
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Question # 12
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 # 13
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 # 14
Laws of reflection and refraction can also be explained by
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Particle nature of light
Quantum nature of light
Wave nature of light
Complex nature of light
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Question # 15
The wave nature of light was proposed by
Choose an answer
Newton
Thomas Young
Huygen
None of these
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