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Physics ECAT Pre Engineering Chapter 9 Physical Optics Online Test MCQs With Answers
Question # 1
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 # 2
To sources are said to be coherent if they have:
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Same amplitude
Same wavelength
Definite phase relation with each other
None of them
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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
The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
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1
0.2
2
0.1
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Question # 5
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 # 6
Frequency of red color as compared to that of violet color is:
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Equal
Smaller
Greater
None of these
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Question # 7
A grating with high resolving power can distinguish _______ difference in wavelengths :
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Smaller
Larger
Zero
None of these
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Question # 8
The contrast in the fringes in an interference pattern depends upon
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Fringe width
Relative difference intensities of the two sources
Distance between the slits
Wavelength
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Question # 9
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 # 10
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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Question # 11
Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
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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 # 12
The appearance of the colour in the soap (oil) film results from:
Choose an answer
Dispersion
Interference
Reflection
Refraction
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Question # 13
The distance from eye to near point is taken as:
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10 cm
15 cm
20 cm
25 cm
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Question # 14
When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
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Greater, smaller
Smaller, smaller
Smaller, larger
Greater, larger
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Question # 15
Which one of the following can act approximately as a source of monochromatic light;
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Neon lamp
Fluorescent tube
Sodium lamp
None of these
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Question # 16
The locus of all the points in the same phase of vibration is called:
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Wave packet
Wave front
Wave number
None of them
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Question # 17
Light has:
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Wave nature
Particle nature
Dual nature
None of these
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Question # 18
With age, least distance of distinct vision:
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Increases
Decreases
Is not affected
None is correct
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