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Lasers mcq. We covered all the Lasers mcq in this post for free so that you can practice well for the exam.
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mcq on Lasers for Students
What is the core characteristic of a single-mode optical fibre?
a. Narrow core diameter
b. Wide core diameter
c. Large cladding diameter
d. Options a and c
Option d – Options a and c
How much dispersion occurs in single-mode fibres?
a. High dispersion
b. Low dispersion
c. No dispersion
d. None of the above
Option c – No dispersion
What is the preferred use of single-mode fibres?
a. Suitable for long-distance data transmission
b. Suitable for short-distance connections
c. Both options a and c
d. Not used in Communication
Option a – Suitable for long-distance data transmission
Which of the following applies to multi-mode optical fibres?
a. Bigger core diameter compared to single-mode fibres
b. Smaller core diameter than single-mode fibres
c. Same core diameter as single-mode fibres
d. None of the above
Option a – Bigger core diameter compared to single-mode fibres
Which Light source is typically used to inject Light into multi-mode fibre?
a. Laser diode
b. P-N junction diode
c. LED Light source
d. None of the above
Option c – LED Light source
What type of Light rays travel through a step-index fibre?
a. Meridional rays
b. Skew rays
c. Helical rays
d. None of the above
Option a – Meridional rays
What is the standard cladding diameter in step-index fibres?
a. 50 μm
b. 200 μm
c. 110 μm
d. 150 μm
Option c – 110 μm
What kind of refractive index does the cladding in graded-index fibre possess?
a. Constant refractive index
b. Variable refractive index
c. Both a and b
d. None of the above
Option a – Constant refractive index
Which of the following is incorrect about graded-index optical fibres?
a. They support high bandwidth
b. Easy to couple with Light source
c. High cost
d. Have significant dispersion
Option d – Have significant dispersion
What type of output does a ruby laser produce?
a. Continuous output
b. Pulsed output
c. Low intensity beam
d. None of the above
Option b – Pulsed output
What serves as the active medium in gas lasers?
a. Xenon flash lamp
b. Fused silica tube
c. Radio frequency generator
d. Metal vapours
Option d – Metal vapours
On which principle does an optical fibre operate?
a. Interference
b. Diffraction
c. Total internal reflection
d. Polarisation
Option c – Total internal reflection
Which laser uses optical pumping?
a. Helium-Neon laser
b. CO₂ laser
c. Semiconductor laser
d. Ruby laser
Option d – Ruby laser
In which laser type is electric discharge pumping employed?
a. Helium-Neon laser
b. CO₂ laser
c. Semiconductor laser
d. Ruby laser
Option a – Helium-Neon laser
What is essential for laser emission to occur?
a. Higher Population inversion in metastable state
b. Higher Population inversion in ground state
c. Both a and b
d. None of the above
Option a – Higher Population inversion in metastable state
Which of the following can serve as laser active media?
a. Solids
b. Liquids
c. Gases
d. All of the above
Option d – All of the above
What is the excitation source in a ruby laser?
a. Ruby crystal itself
b. Xenon flash tube wound in a spiral shape
c. Glass cylinder
d. None of the above
Option b – Xenon flash tube wound in a spiral shape
What is the emitted wavelength of a ruby laser?
a. 6943 Å
b. 6493 Å
c. 6394 Å
d. 6934 Å
Option a – 6943 Å
What kind of source is a laser?
a. Coherent
b. Incoherent
c. Both a and b
d. None of the above
Option a – Coherent
Who invented the first laser?
a. Albert Einstein
b. Charles H. Townes
c. Theodore H. Maiman
d. Ali Javan
Option b – Charles H. Townes
How many photons result from a stimulated emission process?
a. One
b. Two
c. Three
d. Four
Option b – Two
What happens to amplitude in stimulated emission?
a. It increases
b. It decreases
c. It first increases, then decreases
d. None of the above
Option a – It increases
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