Quiz  /  Optical communication Bank PO MCQ Questions With Answers

  • 1. 
    Optical fibers suffer radiation losses at bends or curves on their paths. State true or false.

  • True
  • False

  • 2. 
    Range of optical communication

  • 700 nm to 1700 nm
  • 800 nm to 1700 nm
  • 800 nm to 1200 nm
  • 800mm to 1600 mm

  • 3. 
    The wavelength region used in second window

  • 800 to 900 nm
  • 1100 to 1350nm
  • 1500 to 1650nm
  • 1200 nm to 1400 nm

  • 4. 
    Which communication gives larger repeater spacing ?

  • Coaxial cable
  • Twisted pair cable
  • Microwave communication system

  • 5. 
    Fiber optics provide data security.

  • True
  • False

  • 6. 
    The light sources used in fibre optics communication are :

  • a) LED’s and Lasers
  • b) Phototransistors
  • c) Xenon lights
  • d) Incandescent

  • 7. 
    Define - Acceptance Angle

  • maximum angle that a light ray can have relative to the axis of the fiber and propagate down the fiber.
  • minimum angle that a light ray can have relative to the axis of the fiber and propagate down the fiber.
  • Right angle that a light ray can have relative to the axis of the fiber and propagate down the fiber.
  • None of the above

  • 8. 
    The type of attenuation shown is

  • Absorption Loss
  • Scattering Loss
  • Radiation Loss
  • Adsorption Loss

  • 9. 
    Helium-Neon LASER is a:

  • Gas LASER
  • Liquid LASER
  • Solid LASER
  • Plasma Laser

  • 10. 
    Which Physicist paved the idea that we can guide light.

  • John Tyndal
  • John Mathews
  • Johnson
  • Jerry Pinto

  • 11. 
    A device which converts electrical energy in the form of a current into optical energy is called as

  • a) Optical source
  • b) Optical coupler
  • c) Optical isolator
  • d) Circulator

  • 12. 
    What are fibre optics?

  • thin, flexible fibres of glass/plastic
  • flexible fibers of copper
  • strands of rubber
  • those glow toys

  • 13. 
    The ratio of speed of light in air to the speed of light in another medium is called as_________

  • a) Speed factor
  • b) Dielectric constant
  • c) Reflection index
  • d) Refraction index

  • 14. 
    Optical fibers work on the principle of

  • total internal refraction
  • total internal absorption
  • total internal reflection
  • total internal flow

  • 15. 
    Which of these types of optical fibers is almost impossible to manufacture?

  • Single mode, step index OFC
  • MUlti mode, Step index OFC
  • Single mode, graded index OFC
  • Multi mode, graded index OFC

  • 16. 
    Compared to the core, the index of refraction of the cladding must be:

  • a. the same
  • b. greater
  • c. less
  • d. doesn’t have an index of refraction

  • 17. 
    The condition for propagation of light in optical fibers is

  • Sinθi
  • Sinθi>NASin\theta_i>NASinθi​>NA
  • Sinθi=NASin\theta_i=NASinθi​=NA
  • Sinθi=0.5Sin\theta_i=0.5Sinθi​=0.5
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