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Physics ECAT Pre Engineering Chapter 9 Physical Optics Online Test MCQs With Answers
Question # 1
If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:
Choose an answer
Double the size
Same size
Half the size
None of these
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Question # 2
Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
Choose an answer
Refraction
Reflection
Diffraction
Formation of spectrum
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Question # 3
How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:
Choose an answer
The upper half of the image is cut off
The brightness of the image is reduced
The brightness of the image is increased
No effect at all
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Question # 4
To see the minor details of the object by microscope, it should have:
Choose an answer
High magnifying power
High resolving power
Am objective of larger focal length
None of these
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Question # 5
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 # 6
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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Question # 7
The locus of all points in a medium having same phase of vibration is called
Choose an answer
Crest
Trough
Wavelength
Wave-front
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Question # 8
The property of light which does not change with the nature of the medium is:
Choose an answer
Frequency
Amplitude
Wavelength
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:
Choose an answer
Monochromatic
Phase coherent
Both of above
None of above
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Question # 10
A ray passing through optical center of a lens, after refraction:
Choose an answer
Passes through focus
Go deviated
Retraces its path
Both B and C
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Question # 11
The least distance of distinct vision is:
Choose an answer
10 cm
25 cm
50 cm
100 cm
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Question # 12
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 # 13
Which one of the following 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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Question # 14
Least distance of distinct vision of an old man possibly becomes:
Choose an answer
A little less than 25 cm
A little more than 25 cm
Much less than 25 cm
None of these
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Question # 15
If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:
Choose an answer
5 cm
10 cm
20 cm
25 cm
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