Engineering Entrance Sample Papers

Wave Optics Questions

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Wave Optics Question Bank

Question 1
In Young's double slit experiment, if one of the slit is closed fully, then in the interference pattern
A
None of these
B
The bright fringes will become fainter
C
A bright slit will be observed, no interference pattern will exist
D
The bright fringes will become more bright
Question 2
Infrared radiation was discovered in 1800 by
A
William Herschel
B
Wilhelm Roentgen
C
William Wollaston
D
Thomas Young
Question 3
What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm?
A
0.01 rad
B
1 rad
C
0.001 rad
D
0.1 rad
Question 4
Assuming that universe is expanding, if the spectrum of light coming from a star which is going away from earth is tested, then in the wavelength of light
A
The spectrum will seems to shift to ultraviolet side
B
None of these
C
The spectrum will move to infrared region
D
There will be no change
Question 5
When a thin metal plate is placed in the path of one of the interfering beams of light

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A
Fringes becomes blurred
B
Fringe width increases
C
Fringes disappear
D
Fringes become brighter
Question 6
When a compact disc is illuminated by a source of white light. Coloured 'lanes' are observed. This is due to
A
Refraction
B
Interference
C
Dispersion
D
Diffraction
Question 7
Which of the following is not a property of light?
A
It has finite speed
B
It can travel through vacuum
C
It requires a material medium for propagation
D
It involves transportation of energy
Question 8
Biological importance of Ozone layer is

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A
It stops ultraviolet rays
B
Ozone rays reduce green house effect
C
Ozone layer reflects radio waves
D
Ozone layer controls Oxygen and Hydrogen radio in atmosphere
Question 9
In Fresnel’s biprism experiment, on increasing the prism angle, fringe width will

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A
Increase
B
Remain unchanged
C
Depend on the position of object
D
Decrease
Question 10
The sun is rotating about its own axis. The spectral lines emitted from the two ends of its equator, for an observer on the earth, will show
A
Shift towards red end
B
Shift towards red end by one line and towards violet end by other
C
Shift towards violet end
D
No shift
Question 11
If the shift of wavelength of light emitted by a star is towards violet, then this shows that star is
A
Information is incomplete
B
Moving away from earth
C
Stationary
D
Moving towards earth
Question 12
The apparent wavelength of the light from a star moving away from the earth is 0.01% more than its real wavelength. Then the velocity of star is
A
60 km/sec
B
15 km/sec
C
30 km/sec
D
150 km/sec
Question 13
A
Ionosphere
B
Troposphere
C
Mesosphere
D
Stratosphere
Question 14
In a Young's double slit experiment, the central point on the screen is
A
Dark
B
Bright
C
First dark and then bright
D
First bright and then dark
Question 15
In Young's double slit experiment, if the slit widths are in the ratio 1 : 9, then the ratio of the intensity at minima to that at maxima will be
A
1/4
B
1
C
1/3
D
1/9
Question 16
A single slit of width a is illuminated by violet light of wavelength 400 nm and the width of the diffraction pattern is measured as y. When half of the slit width is covered and illuminated by yellow light of wavelength 600 nm, the width of the diffraction pattern is
A
None of these
B
The pattern vanishes and the width is zero
C
y / 3
D
3y
Question 17
In case of linearly polarized light, the magnitude of the electric field vector:
A
Increases and decreases linearly with time
B
Does not change with time
C
Is parallel to the direction of propagation
D
Varies periodically with time
Question 18
In Young’s double slit experiment, the central bright fringe can be identified
A
As it is narrower than other bright fringes
B
As it has a greater intensity than the other bright fringes
C
As it is wider than other bright fringes
D
By using white light instead of monochromatic light
Question 19
Polarised glass is used in sun glasses because
A
It is cheaper
B
It reduces the light intensity to half an account of polarisation
C
It has good colour
D
It is fashionable
Question 20
The electromagnetic waves do not transport
A
Charge
B
Information
C
Momentum
D
Energy
Question 21
Doppler's effect in sound in addition to relative velocity between source and observer, also depends while source and observer or both are moving. Doppler effect in light depend only on the relative velocity of source and observer. The reason of this is
A
Photoelectric effect
B
Einstein theory of relativity
C
Einstein mass - energy relation
D
None of these
Question 22
If a source of light is moving away from a stationary observer, then the frequency of light wave appears to change because of
A
Diffraction
B
Interference
C
Doppler's effect
D
None of these
Question 23
A single slit of width 0.20 mm is illuminated with light of wavelength 500 nm. The observing screen is placed 80 cm from the slit. The width of the central bright fringe will be

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A
2 mm
B
5 mm
C
1 mm
D
4 mm
Question 24
Young's experiment establishes that
A
Light consists of neither particles nor waves
B
Light consists of waves
C
Light consists of particles
D
Light consists of both particles and waves
Question 25
In Young's double slit interference experiment, the slit separation is made 3 fold. The fringe width becomes
A
3 times
B
1/3 times
C
9 times
D
1/9 times
There are 25 questions to complete.
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