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RGPV Unit – 4 Optical Fiber MCQs
Q1. _________ is a technology related to transportation of optical energy in guiding media?
1. Laser
2. Fiber optics
3. Single-mode fiber
4. Multimode fiber
Answer:- 2) Fiber optics
Q2. The core is surrounded by _____
1. core
2. cladding
3. both 1 and 2
4. protective jacket
Answer:- 2) Cladding
Q3. The core diameter can vary from ____ to ____
1. 15um to 100um
2. 24um to 80um
3. 56um to 95um
4. 5um to 100um
Answer:- 4) 5um to 100um
Q4. The Cladding diameter is about ______
1. 155um
2. 135um
3. 125um
4. 115um
Answer:- 3) 125um
Q5. _____ refractive index is lower than _____
1. Core, cladding
2. Cladding, core
3. Jacket, cladding
4. Core, protective jacket
Answer:- 2) Cladding, core
Q6. Optical fibers are based on the principle of _____
1. total internal reflection
2. acceptance angle
3. acceptance cone
4. absorption of light
Answer:- 1) total internal reflection
Q7. Bundle of optical fiber is used for _____
1. optical signal transmission
2. single-mode fiber
3. multi-mode fiber
4. core and cladding
Answer:- 1) optical signal transmission
Q8. Classification of optical fiber-based on modes.
1. Core and Cladding
2. Single-mode fiber and Multimode fibre
3. Acceptance angle and Acceptance cone
4. Protective jacket
Answer:- 2) Single-mode fiber and Multimode fiber
Q9. In single-mode fiber, the core diameter is 5um and cladding diameter is _____
1. 75um
2. 35um
3. 70um
4. 40um
Answer:- 3) 70um
Q10. In multimode fiber, the core diameter is _____ and the Cladding diameter is 70um.
1. 30um
2. 45um
3. 70um
4. 40um
Answer:- 4) 40um
Q11. Classification of optical fiber-based on refractive index.
1. Core and Cladding
2. Single-mode fiber and Multimode fibre
3. Acceptance angle and Acceptance cone
4. Step index fiber and Graded index fiber
Answer:- 4) Step index fiber and Graded index fiber
Q12. In step-index fiber, the core and Cladding have ______ refractive index.
1. uniform
2. non-uniform
3. semi uniform
4. zero
Answer:- 1) uniform
Q13. The core has a non-uniform refractive index and Cladding has a uniform refractive index.
1. In the graded step fiber
2. Single-mode fiber and Multimode fiber
3. Acceptance angle and Acceptance cone
4. Step index fiber and Graded index fiber
Answer:- 1) In the graded step fiber
Q14. _________ determines the light gathering ability of the fiber.
1. Total internal reflection
2. Acceptance angle
3. Numerical aperture
4. Acceptance cone
Answer:- 3) Numerical aperture
Q15. _______ Is also called normalised frequency.
1. V-number
2. P-number
3. R-number
4. H-number
Answer:- 1) V-number
Q16. ________ determines the operating frequency which carry out total internal reflection.
1. V-number
2. P-number
3. R-number
4. H-number
Answer:- 1) V-number
Q17. The deformation in the pulse is called
1. pulse refraction
2. pulse dispersion
3. pulse refraction
4. waveguide dispersion
Answer:- 2) pulse dispersion
Q18. ________converts a non electrical message into an electrical signal.
1. Transducers
2. Message origin
3. Microphones
4. Power source
Answer:- 2) Message origin
Q19. Types of modulation are _______
1. one
2. three
3. five
4. two
Answer:- 4) two
Q20. On state represent a digital _______
1. one
2. three
3. five
4. two
Answer:- 1) one
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Q21. Off-state represent a digital _______
1. three
2. zero
3. five
4. two
Answer:- 2) zero
Q22. Full form of LED is ______
1. light-emitting diode
2. light-emitting device
3. light emitting display
4. light effecting diode
Answer:- 1) light-emitting diode
Q23. Information channel provides a path between transmitter and _____
1. receiver
2. perceiver
3. Recipient
4. transmitter
Answer:- 1) receiver
Q24. Optical fibers are _______
1. conductor
2. insulator
3. semiconductor
4. all of these
Answer:- 2) insulator
Q25. How are optical fibers classified?
1. two
2. three
3. zero
4. five
Answer:- 2) three
Q26. The diameter of core n1 is ___ n2 cladding.
1. greater than
2. less than
3. equal to
4. zero
Answer:- 1) greater than
Q27. Step index multimode fiber has ____ lifetime then the laser diode.
1. shorter
2. longer
3. equal
4. zero
Answer:- 2) longer
Q28. Graded index multimode fibre dispersion is ______
1. high
2. low
3. zero
4. middle
Answer:- 2) low
Q29. The numerical aperture is defined as the _____ of acceptance angle.
1. Sin
2. Cos
3. Sec
4. Cot
Answer:- 1) Sin
Q30. What is dispersion in optical fiber communication?
1. Compression of light pulses
2. Broadening of transmitted light pulses along the channel
3. of light pulses on compression
4. Absorption of light pulses
Answer:- 2) Broadening of transmitted light pulses along the channel
Q31. What does ISI stand for in optical fiber communication?
1. Invisible size interference
2. Infrared size interference
3. Inter-symbol interference
4. Inter-shape interference
Answer:- 3) Inter-symbol interference
Q32. 3dB optical bandwidth is always ____ the 3dB electrical bandwidth.
1. smaller than
2. larger than
3. negligible than
4. equal to
Answer:- 2) larger than
Q33. The small section of fiber that is coupled to the optical source is known as
1. fly lead
2. pigtail
3. both 1 and 2
4. none of the above
Answer:- 3) both 1 and 2
Q34. Which among the following characteristics of laser light specifies the precise movement of all individual light waves together through time and space?
1. Monochromatic
2. Directional
3. Coherent
4. Brightness
Answer:- 3) Coherent
Q35. In communication with fiber withstand extreme temperature before deteriorating then what will we do approaching leave glass fiber unaffected.
1. 800°C
2. 700°C
3. 600°C
4. 900°C
Answer:- 1) 800°C
Q36. Which of the following is known as fiber optic backbone?
1. Telecommunication
2. Cable television
3. Delay lines
4. Bus topology
Answer:- 4) Bus topology
Q37. Optical filter are made of ______
1. metallic conductor
2. plastic doped with metallic impurities
3. dielectric material
4. magnetic oxides
Answer:- 3) dielectric material
Q38. In an optical fiber, the relation between the refractive indices of core (n1) and cladding (n2) is ______
1. n1=n2
2. n1>n2
3. n1<n2
4. none of these
Answer:- 2) n1>n2
Q39. The numerical aperture of an optical fiber depends on _______
1. core refractive index
2. critical angle
3. both a & b
4. none of these
Answer:- 3) both 1 & 2
Q40. The angle of acceptance is maximum for a filter of ______
1. The critical angle is minimum
2. The critical angle is zero
3. The critical angle is maximum
4. The critical angle is negative
Answer:- 1) The critical angle is minimum
Q41. In an optical fiber, dispersion means
1. pulse distortion
2. narrowing
3. pulse broadening
4. pulse rise time
Answer:- 3) pulse broadening
Q42. Inner cylinder which is made of glass, called _______
1. core
2. cladding
3. both 1 and 2
4. protective jacket
Answer:- 1) core
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