NEET Physics is the very imporatant paper in the Medical Entrance EXAM. So these NEET Physics MCQs with Answers for all Concepts as per the new syllabus. Practice daily with these NEET Physics objective questions on air pollution . NEET Physics Fibre Optics Multiple Choice Questions
MCQs on Fibre Optics :
1. 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
Answer: (C) Linear circuitry
2. 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
Answer: (A) Light collection
3. An optical fibre consists of a core μ1 surrounded by a cladding of μ＜ μ1. A beam of light enters from the air at an angle of α with the axis of the fibre. The highest α for which ray can be travelled through fibre is
(A) (cos ^{ -1 }{ sqrt { { mu }_{ 2 }^{ 2 }-{ mu }_{ 1 }^{ 2 } } } )
(B) (sin ^{ -1 }{ sqrt { { mu }_{ 1 }^{ 2 }-{ mu }_{ 2 }^{ 2 } } } )
(C) (tan ^{ -1 }{ sqrt { { mu }_{ 1 }^{ 2 }{ -mu }_{ 2 }^{ 2 } } } )
(D) (sec ^{ -1 }{ sqrt { { mu }_{ 1 }^{ 2 }-{ mu }_{ 2 }^{ 2 } } } )
Answer
Answer: (B) (sin ^{ -1 }{ sqrt { { mu }_{ 1 }^{ 2 }-{ mu }_{ 2 }^{ 2 } } } )
4. 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
Answer: (D) Recoding to match output standard
5. 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
Answer: (C) As an evanescent wave
6. 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
Answer: (B) Plastic fibre optic cable
7. 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
Answer: (D) Incident at an angle greater than the critical angle
8. 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
Answer: (D) Rainbow formation
9. 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
Answer: (A) Single-mode fibre
10. 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
Answer: (C) Ten times the core diameter