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Online Tests
ECAT Pre General Science Physics Chapter 9 Physical Optics Online Test MCQs With Answers
Question # 1
To sources are said to be coherent if they have:
Choose an answer
Same amplitude
Same wavelength
Definite phase relation with each other
None of them
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Question # 2
The appearance of the colour in the soap (oil) film results from:
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Dispersion
Interference
Reflection
Refraction
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Question # 3
Conventionally, all the distance p, q, f are measured from _____ of the lens:
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Focus
Optical center
Edges
None of these
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Question # 4
The terms phase difference and path difference are:
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Same
Different
Equal
None of these
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Question # 5
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 # 6
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 # 7
With age, least distance of distinct vision:
Choose an answer
Increases
Decreases
Is not affected
None is correct
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Question # 8
In the formula R = N x m for diffraction grating, N denotes:
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No. of lines/cm
No. of lines/meter
Total number of lines
None of above
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Question # 9
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 # 10
Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:
Choose an answer
6 x 10
-5
rad
7 x 10
-5
rad
8 x 10
-5
rad
None of these
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Question # 11
Monochromatic light means waves of:
Choose an answer
Same frequency
Same colour
Same wavelength
All of them
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Question # 12
Light appears to travel in straight line because
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It is not absorbed by the atmosphere
It is refracted by the atmosphere
Its wavelength is very small
Its velocity is very large
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Question # 13
The focal length of convex lens having magnifying power of 5.55 is:
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5.5 cm
5 cm
4.5 cm
6 cm
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Question # 14
Angle between the ray of light and the corresponding wavefront is:
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0
°
60
°
90
°
120
°
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Question # 15
The ratio of the size of the image to that of object is called:
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Focal length
Aperture
Linear magnification
Principal axis
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Question # 16
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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