Fiber Optic Communication MCQs

By: Prof. Dr. Fazal Rehman Shamil | Last updated: December 12, 2024

1. What is the primary advantage of fiber optic communication over traditional copper cables?

  • A) Higher signal attenuation
  • B) Greater bandwidth and faster data transmission
  • C) Easier to install and maintain
  • D) Increased electromagnetic interference

Answer: B) Greater bandwidth and faster data transmission


2. What is the core of an optical fiber made of?

  • A) Plastic or metal
  • B) Copper
  • C) Glass or plastic
  • D) Carbon

Answer: C) Glass or plastic


3. What is the principle behind fiber optic communication?

  • A) Total internal reflection of light
  • B) Diffusion of light waves
  • C) Reflection of radio waves
  • D) Electrical signal conduction

Answer: A) Total internal reflection of light


4. Which type of optical fiber has a core diameter of approximately 8-10 microns?

  • A) Single-mode fiber
  • B) Multi-mode fiber
  • C) Step-index fiber
  • D) Graded-index fiber

Answer: A) Single-mode fiber


5. What is the primary cause of signal loss in optical fibers?

  • A) Electromagnetic interference
  • B) Attenuation and dispersion
  • C) Signal reflection
  • D) Heat generation

Answer: B) Attenuation and dispersion


6. What is the purpose of the cladding in an optical fiber?

  • A) To conduct light signals
  • B) To provide mechanical strength
  • C) To reflect light back into the core
  • D) To absorb stray light

Answer: C) To reflect light back into the core


7. Which light source is commonly used in fiber optic communication?

  • A) Fluorescent lamp
  • B) Light Emitting Diode (LED)
  • C) Laser Diode
  • D) Halogen lamp

Answer: C) Laser Diode


8. What is the typical wavelength of light used in fiber optic communication?

  • A) 400-500 nm
  • B) 600-700 nm
  • C) 850 nm, 1310 nm, and 1550 nm
  • D) 2000 nm

Answer: C) 850 nm, 1310 nm, and 1550 nm


9. What is dispersion in fiber optic communication?

  • A) The scattering of light
  • B) The spreading of light pulses over time
  • C) The reflection of light signals
  • D) The loss of signal intensity

Answer: B) The spreading of light pulses over time


10. Which component converts electrical signals into light signals in fiber optic systems?

  • A) Transceiver
  • B) Photodetector
  • C) Optical transmitter
  • D) Optical coupler

Answer: C) Optical transmitter


11. Which of the following is NOT a common material used in fiber optic cables?

  • A) Plastic
  • B) Glass
  • C) Copper
  • D) Kevlar

Answer: C) Copper


12. What does WDM stand for in fiber optic communication?

  • A) Wide Data Modulation
  • B) Wavelength Division Multiplexing
  • C) Wireless Data Management
  • D) Waveform Displacement Modulation

Answer: B) Wavelength Division Multiplexing


13. What is the role of an Optical Amplifier in fiber optic communication?

  • A) To convert optical signals to electrical signals
  • B) To increase the strength of optical signals without conversion
  • C) To decrease signal attenuation
  • D) To split optical signals into multiple channels

Answer: B) To increase the strength of optical signals without conversion


14. Which of the following is a disadvantage of fiber optic communication?

  • A) High bandwidth
  • B) Immunity to electromagnetic interference
  • C) High initial installation cost
  • D) Low signal attenuation

Answer: C) High initial installation cost


15. What is the term for the bending of light away from its path in fiber optics due to impurities?

  • A) Scattering
  • B) Dispersion
  • C) Reflection
  • D) Refraction

Answer: A) Scattering