Quick Quiz ( Mobile Recommended )
Lasers mcq. We covered all the Lasers mcq in this post for free so that you can practice well for the exam.
Install our MCQTUBE Android App from the Google Play Store and prepare for any competitive government exams for free.
These types of competitive mcqs appear in exams like SSC CGL, CHSL, JE, MTS, Stenographer, CPO, Railway Group-D, NTPC, ALP, JE, RPF, Tech, Bank, Delhi Police Constable, UP Lekhpal, dsssb, DDA ASO, BPSC Teaching, Defence, UPSSSC, UPSC (Pre), UPP, SI, UPTET, UPPCS, BPSC, BSSC, SBI, IBPS, LIC, State PCS, CDS, NDA, Assistant Commandant, and other Competitive Examinations, etc.
We created all the competitive exam mcqs into several small posts on our website for your convenience.
You will get their respective links in the related posts section provided below.
Related Posts:
- Best Online Coaching for CSIR NET Physical Science
- MCQ on X Ray Diffraction
- Best Study Material for CSIR NET Life Sciences
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
We covered all the lasers mcq above in this post for free so that you can practice well for the exam.
Check out the latest mcq content by visiting our mcqtube website homepage.
Also, check out:
