Laser Objective Type Questions and Answers

Questions

21 Directionality property of laser can be used in

A surveying

B remote sensing

C lidar

D All Correct

View Answer

Answer: All Correct

22 Nd - YAG laser is a

A two level laser

B three level laser

C four level laser

D five level laser

View Answer

Answer: four level laser

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23 In Nd-YAG laser, YAG means

A Yttrium Aluminium Garnet

B 𝑌3𝐴�5𝑂12

C Yellow Aluminium Garnet

D Both A and B

View Answer

Answer: Both A and B

24 The pumping source in Nd:YAG laser is

A chemical

B optical

C electrical

D mechanical

View Answer

Answer: optical

25 The active medium in Nd:YAG laser is

A Nd

B YAG crystal

C Y

D AG

View Answer

Answer: Nd

26 Example of solid state laser is

A He-Ne Laser

B 𝐶𝑂2 Laser

C Nd:YAG Laser

D Dye Laser

View Answer

Answer: Nd:YAG Laser

27 He-Ne laser is a

A three level laser

B four level laser

C two level laser

D five level laser

View Answer

Answer: four level laser

28 The pumping source in He-Ne laser

A optical

B electric discharge

C chemical

D mechancal

View Answer

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

View Answer

Answer: 10:1

30 The active medium in He-Ne laser is

A He

B Ne

C He-Ne

D All correct

View Answer

Answer: Ne

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

View Answer

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

View Answer

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

View Answer

Answer: 3-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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: entire object

38 Zener diode has

A constant breakdown voltage

B sharp break down voltage

C varying breakdown voltage

D None

View Answer

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

View Answer

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

View Answer

Answer: monochromatic

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