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Online Tests
Physics ECAT Pre Engineering Chapter 9 Physical Optics Online Test MCQs With Answers
Question # 1
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 # 2
The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called
Choose an answer
Diffraction
Interference
Polarization
Dispersion
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Question # 3
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 # 4
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 # 5
The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
Choose an answer
1
0.2
2
0.1
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Question # 6
A grating with high resolving power can distinguish _______ difference in wavelengths :
Choose an answer
Smaller
Larger
Zero
None of these
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Question # 7
Monochromatic light means waves of:
Choose an answer
Same frequency
Same colour
Same wavelength
All of them
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Question # 8
Light has:
Choose an answer
Wave nature
Particle nature
Dual nature
None of these
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Question # 9
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 # 10
If the object is situated at focus of a convex lens, then its image is formed at:
Choose an answer
F
2F
Infinity
None of these
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Question # 11
According to Huygen's principle
Choose an answer
light travels in straight line
Light is a transvers wave
Light has dual nature
All points on the primary wave-front are the sources of secondary wavelets
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Question # 12
Huygen's theory cannot explain
Choose an answer
Diffraction
Interference
Polarization
Photoelectric effect
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Question # 13
Speed of light in vacuum depends upon:
Choose an answer
Frequency
Wavelength
Amplitude
None of these
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Question # 14
If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity
Choose an answer
Fringe width will decrease
Fringe width will increase
Fringe width will remain unchanged
Fringe will become less intense
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Question # 15
When the object lies between F and 2F, the image formed by is formed at:
Choose an answer
Real
Virtual
Diminished
Erect
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