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Physics ECAT Pre Engineering Chapter 9 Physical Optics Online Test MCQs With Answers
Question # 1
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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Question # 2
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 # 3
The magnifier forms a virtual image of the object at:
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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 # 4
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 # 5
The property of light which does not change with the nature of the medium is:
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Frequency
Amplitude
Wavelength
None of these
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Question # 6
A virtual image is formed when object is placed:
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Within focal length of a convex lens
Near the focal point of a concave lens
Both A and B
Away from 2F of a convex lens
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Question # 7
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 # 8
The least distance of distinct vision is:
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10 cm
25 cm
50 cm
100 cm
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Question # 9
In case of point, source of light shape of wavefront is:
Choose an answer
Spherical
Cylindrical
Plane
None of these
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Question # 10
The size of the image is maximum when its distance from the magnifying glass is:
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0.10 m
0.15 m
0.20 m
0.25 m
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Question # 11
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 # 12
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 # 13
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 # 14
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 # 15
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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