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
In single-mode fibre, it has
1. Small core diameter
2. High core diameter
3. High cladding diameter
4. (1) and (3)
Option 4 – (1) and (3)
Dispersion in single-mode fibre is
1. High
2. Less
3. No dispersion
4. None
Option 3 – No dispersion
Single-mode fibres are more suitable for
1. Long-distance communications
2. Small-distance communications
3. (1) and (3)
4. Not for communications
Option 1 – Long-distance communications
Multi-mode fibre has
1. Large core diameter than single-mode fibre
2. Small core diameter than single-mode fibre
3. Equal core diameter as single-mode fibre
4. None
Option 1 – Large core diameter than single-mode fibre
The light ray is entered into the multi-mode fibre using
1. Laser diode
2. P-N junction diode
3. LED source
4. None
Option 3 – LED source
The light rays propagate through step-index optical fibre are
1. Meridional rays
2. Skew rays
3. Helical rays
4. None
Option 1 – Meridional rays
The diameter of cladding in step-index optical fibre is
1. 50 μm
2. 200 µm
3. 110 µm
4. 150 μm
Option 3 – 110 µm
The cladding in the Graded-index optical fibre has
1. Uniform refractive index
2. Non-uniform refractive index
3. (1) and (2)
4. None
Option 1 – Uniform refractive index
The wrong statement about Graded index optical fibre was
1. Greater bandwidth
2. Easy to couple with an optical source
3. Expensive
4. High dispersion
Option 4 – High dispersion
The Ruby-laser output is
1. Continuous
2. Not continuous
3. Less intense
4. None
Option 2 – Not continuous
The active media in gas lasers are
1. A helical xenon flash tube
2. Fused quartz tube
3. R.F generator
4. Vapours of metals
Option 4 – Vapours of metals
The optical fibres are based on the principle of
1. Interference
2. Diffraction
3. Total internal reflection
4. Polarisation
Option 3 – Total internal reflection
Optical pumping used in
1. He-Ne laser
2. CO₂ laser
3. Semiconductor laser
4. Ruby laser
Option 4 – Ruby laser
Electric discharge pumping method used in
1. He-Ne laser
2. CO₂ laser
3. Semiconductor laser
4. Ruby laser
Option 1 – He-Ne laser
The basic requirement for the laser action is
1. Population inversion of metastable state should be high
2. Population inversion of ground state should be high
3. (1) and (2)
4. None
Option 1 – Population inversion of metastable state should be high
Active medium in lasers maybe
1. Solid
2. Liquid
3. Gas
4. All the above
Option 4 – All the above
The exciting system in Ruby laser was
1. Ruby crystal
2. A helical xenon flash tube
3. Glass tube
4. None
Option 2 – A helical xenon flash tube
The wavelength of the Ruby laser
1. 6943 A
2. 6493 A
3. 6394 A
4. 6934 A
Option 1 – 6943 A
lasers are
1. Coherent sources
2. incoherent sources
3. (1) and (2)
4. None
Option 1 – Coherent sources
The first laser was developed by
1. Einstein
2. C.H. Townes
3. T.H. Maiman
4. A.Javan
Option 2 – C.H. Townes
The number of photons emitted in stimulated emission is
1. 1
2. 2
3. 3
4. 4
Option 2 – 2
In stimulated emission, the amplitude
1. increases
2. decreases
3. increases then decreases
4. None
Option 1 – increases
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