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NEET MCQ’s On Fibre Optics [ TOP 10 SOLVED]

Posted on September 9, 2022

Fibre Optics MCQs

Q: Data signal with minimum error is generated by which among the following

a) Signal processing circuits
b) Photodiode
c) Linear circuitry
d) None of the above

Answer: (c) Linear circuitry

Q: Which among the following is described by the concept of numerical aperture in an optical fibre?

a) Light collection
b) Light scattering
c) Light dispersion
d) Light polarisation

Answer: (a) Light collection

Q: In an optical fibre communication system, which among the following is not a typical transmitter function?

a) Coding for error protection
b) Decoding of input data
c) Electrical to optical conversion
d) Recoding to match output standard

Answer: (d) Recoding to match output standard

Q: In a single-mode fibre, how does the fraction of energy travelling through bound mode appear in the cladding?

a) As a crescent wave
b) As a gibbous wave
c) As an evanescent wave
d) All the above

Answer: (c) As an evanescent wave

Q: Which among the following fibre optic cables have a core of size 480 μm to 980 μm and made up of polymethylmethacrylate?

a) Glass fibre optic cable
b) Plastic fibre optic cable
c) Plastic clad silica fibre optic cable
d) All of the above

Answer: (b) Plastic fibre optic cable

Q: A ray of light will undergo total internal reflection if it

a) Goes from rarer medium to denser medium
b) Incident at an angle less than the critical angle
c) Strikes the interface normally
d) Incident at an angle greater than the critical angle

Answer: (d) Incident at an angle greater than the critical angle

Q: Which of the following is not due to total internal reflection of light?

a) Brilliance of diamond
b) Mirage formation
c) Optical fibre working
d) Rainbow formation

Answer: (d) Rainbow formation

Q: The fibres not used nowadays for optical fibre communication system are

a) Single-mode fibre
b) Multimode fibre
c) Coaxial cable
d) Multimode graded-index fibres

Answer: (a) Single-mode fibre

Q: In single-mode fibres, the cladding diameter must be at least

a) Five times the core diameter
b) Thrice the core diameter
c) Ten times the core diameter
d) Twice the core diameter

Answer: (c) Ten times the core diameter

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