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ECAT Physics Chapter 9 Physical Optics Online Test MCQs With Answers
Question # 1
Huygen's principles states that:
Choose an answer
Light travels in straigth line
Light has dual nature
Either of these
None of these
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Question # 2
The magnifier forms a virtual image of the object at:
Choose an answer
Least distance of distinct vision
Much farther than the least distance
Both A and B are correct
None of these
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Question # 3
Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
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Gamma rays, micro waves, visible light
Radio waves, ultraviolet waves, X-rays
Ultraviolet rays, infrared rays, micro waves
Visible light, gamma rays, radio waves
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Question # 4
Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
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Refraction
Reflection
Diffraction
Formation of spectrum
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Question # 5
If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:
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5 cm
10 cm
15 cm
20 cm
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Question # 6
A prism splits a beam of white light into seven component colors. This is so because
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Phase of different colors is different
Amplitude of different colors is different
Wavelength of different colors is different
Velocity of different colors is different
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Question # 7
The wave nature of light was proposed by:
Choose an answer
Newton
Thomas Young
Huygen
None of these
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Question # 8
Monochromatic light means waves of:
Choose an answer
Same frequency
Same colour
Same wavelength
All of them
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Question # 9
Huygen's theory cannot explain
Choose an answer
Diffraction
Interference
Polarization
Photoelectric effect
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Question # 10
Wave length 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
To observe interference of light, the condition, which must be met with is that the sources must be:
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Monochromatic
Phase coherent
Both of above
None of above
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Question # 12
Resolving power in mth order diffraction for grating is given by:
Choose an answer
R = N/m
R = m/N
R = N x m
None of these
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Question # 13
In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.
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Bright
Dark
Any of A and B
None of these
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Question # 14
Huygen principle is used to determine:
Choose an answer
Speed of light
Location of wavefront
About polarized or unpolarized light
None of them
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Question # 15
The velocity of light in vacuum can be changed by changing
Choose an answer
Frequency
Amplitude
Wavelength
None of these
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Question # 16
Laws of reflection and refraction can also be explained by:
Choose an answer
Particle nature of light
Quantum nature of light
Wave nature of light
Complex nature of light
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