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Free download in PDF Laser Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
Directionality property of laser can be used in
[A]
surveying
[B]
remote sensing
[C]
lidar
[D]
All Correct
(22)
Nd - YAG laser is a
[A]
two level laser
[B]
three level laser
[C]
four level laser
[D]
five level laser
(23)
In Nd-YAG laser, YAG means
[A]
Yttrium Aluminium Garnet
[B]
π3π΄οΏ½5π12
[C]
Yellow Aluminium Garnet
[D]
Both A and B
(24)
The pumping source in Nd:YAG laser is
[A]
chemical
[B]
optical
[C]
electrical
[D]
mechanical
(25)
The active medium in Nd:YAG laser is
[A]
Nd
[B]
YAG crystal
[C]
Y
[D]
AG
(26)
Example of solid state laser is
[A]
He-Ne Laser
[B]
πΆπ2 Laser
[C]
Nd:YAG Laser
[D]
Dye Laser
(27)
He-Ne laser is a
[A]
three level laser
[B]
four level laser
[C]
two level laser
[D]
five level laser
(28)
The pumping source in He-Ne laser
[A]
optical
[B]
electric discharge
[C]
chemical
[D]
mechancal
Answer: electric discharge
(29)
The ratio of He to Ne in He-Ne laser is
[A]
1:10
[B]
2:13
[C]
10:1
[D]
3:15
(30)
The active medium in He-Ne laser is
[A]
He
[B]
Ne
[C]
He-Ne
[D]
All correct
31
The role of He in He-Ne laser is
[A]
He is an active medium
[B]
population inversion takes place in He
[C]
Stimulated emission takes place in He
[D]
He atoms help in exciting Ne atoms
Answer: He atoms help in exciting Ne atoms
32
The reason for narrow tube in He-Ne laser
[A]
atomic collision with tube wall increases
[B]
atomic collision with tube wall decreases
[C]
there is no effect of narrow tube on He-Ne
[D]
atomic collision with tube wall constant Laser
Answer: atomic collision with tube wall increases
33
The image produced by holography is
[A]
1-dimensional
[B]
2-dimensional
[C]
3-dimensional
[D]
4-dimensional
34
A hologram contains information of the object about
[A]
amplitude only
[B]
phase only
[C]
amplitude and phase both
[D]
neither amplitude nor phase
Answer: amplitude and phase both
35
Hologram is the result of
[A]
Interference of object and reference beam
[B]
polarization of object and reference beam
[C]
diffraction of object and reference beam
[D]
both polarization and diffraction of object and reference beam
Answer: Interference of object and reference beam
36
The information carrying capacity of a hologram is
[A]
less than an ordinary photograph
[B]
more than an ordinary photograph
[C]
equal to an ordinary photograph
[D]
All option correct
Answer: more than an ordinary photograph
37
each part of hologram contains information about
[A]
entire object
[B]
particular part of the object
[C]
important part of the object
[D]
front side of the object
38
Zener diode has
[A]
constant breakdown voltage
[B]
sharp break down voltage
[C]
varying breakdown voltage
[D]
None
Answer: sharp break down voltage
39
Population inversion in laser means
[A]
number of atoms in ground state are more than number of atoms in excited state
[B]
number of atoms in ground state are less than number of atoms in excited state
[C]
number of atoms in ground state is equal to number of atoms in excited state
[D]
none
Answer: number of atoms in ground state are less than number of atoms in excited state
40
Which is correct about laser
[A]
monochromatic
[B]
white
[C]
bi-chromatic
[D]
none
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