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11th Class Part 1 Physics Chapter 9 Test Online MCQs With Answers
Question # 1
Interplaner distance can be determined by
Choose an answer
Newton's rings
Bragg's law
Diffraction pattern
Interferometer
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Question # 2
When one mirror of a Michelson interferometer is moved a distance of 0.5 mm, 2000 fringes and observed, The wavelength of light used is.
Choose an answer
5000 m
50000 A
o
500 cm
2000 A
o
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Question # 3
Which of the following is evidence of wave nature of light
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Interference
Diffraction
Polarization
All of these
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Question # 4
Young in 1801 performed experiment for the first time about
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Interference
Diffraction
Polarization
Particle nature of light
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Question # 5
The distinguish between transverse and longitudinal wave_______ is used.
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Refraction
Interference
Diffraction
polarization
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Question # 6
Which is nooptically active
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Sugar
Tartaric acid
Water
Sodium chloride
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Question # 7
Sodium chloride in a flame gives
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Green light
White light
Red light
Yellow light
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Question # 8
An oil film on water surface shows colour due to.
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Diffraction
Interference
Polarization
Dispersion
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Question # 9
Oil film floating on water exhibits colours due to
Choose an answer
Interference
Diffraction
Polarization
All of these
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Question # 10
The fringe spacing increases if we use.
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Yellow light
Green lgiht
Blue light
Red light
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Question # 11
Bright fringes are also called as
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Minima
Maxima
Wave front
Ray of light
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Question # 12
In case of point source the shape of wave front is
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Circular
Spherical
Elliptical
Square
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Question # 13
Light waves emitted from a source spread in
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Specific direction
All direction
Upward direction
None of these
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Question # 14
Hygen's principle is used for.
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Explain polarization
Locate the wave front
Find the speed of light
Find the index of refraction
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Question # 15
Angle between ray of light and wave front is
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0
o
60
o
90
o
120
o
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Question # 16
When newton ring are seen through the transmitted light, then central spot is.
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Dark
Blue
Bright
Red
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Question # 17
In red light is used as compare to blue light then fringe spacing.
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Decreases
Remain same
Increases
Becomes zero
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Question # 18
Intensity of light depend on
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Wave length
Amplitude
Velocity
Frequency
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