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Physics ECAT Pre Engineering Chapter 9 Physical Optics Online Test MCQs With Answers
Question # 1
Frequency of red color as compared to that of violet color is:
Choose an answer
Equal
Smaller
Greater
None of these
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Question # 2
In order to get interference using two light rays
Choose an answer
The sources should be monochromatic and coherent
The sources should have the same frequency
Superposition should be linear
All of these
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Question # 3
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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Question # 4
Electromagnetic waves transport:
Choose an answer
Energy only
Momentum only
Both A and B are correct
None of is correct
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Question # 5
Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
Choose an answer
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 # 6
The focal length of convex lens having magnifying power of 5.55 is:
Choose an answer
5.5 cm
5 cm
4.5 cm
6 cm
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Question # 7
In the formula R = N x m for diffraction grating, N denotes:
Choose an answer
No. of lines/cm
No. of lines/meter
Total number of lines
None of above
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Question # 8
Stars twinkle due to
Choose an answer
The fact that they do not emit light continuously
The refractive index of earth's atmosphere fluctuates
The Star's atmosphere absorbs its light intermittently
None of these
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Question # 9
The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
Choose an answer
Greater than
Less than
Equal to
None of these
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Question # 10
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:
Choose an answer
5 cm
10 cm
15 cm
20 cm
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Question # 11
The contrast in the fringes in an interference pattern depends upon
Choose an answer
Fringe width
Relative difference intensities of the two sources
Distance between the slits
Wavelength
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Question # 12
When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
Choose an answer
Greater, smaller
Smaller, smaller
Smaller, larger
Greater, larger
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Question # 13
The terms phase difference and path difference are:
Choose an answer
Same
Different
Equal
None of these
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Question # 14
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 # 15
The locus of all the points in the same phase of vibration is called:
Choose an answer
Wave packet
Wave front
Wave number
None of them
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