Data Communications - Physical Layer

48 Questions | Total Attempts: 232

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Data Communications - Physical Layer - Quiz

This quiz is all about Physical Layer.


Questions and Answers
  • 1. 
    The type of coaxial cable which uses a dielectric material to separate conductors is called __________________.
  • 2. 
    The type of coaxial cable which uses a solid dielectric material to separate conductors is called _______________.
  • 3. 
    Signals propagating down an unguided transmission medium are available to anyone who has a device capable of receiving them. TRUE or FALSE?
  • 4. 
    The band of frequencies that are too low to be seen by the human eye.
  • 5. 
      Physical layer is the lowest layer of the OSI protocol hierarchy which also means the ______________________ .
    • A. 

      Computer

    • B. 

      Modem

    • C. 

      Transmission medium

    • D. 

      Conductors

  • 6. 
    The  displacement of ____________ waves is in the direction of propagation.
    • A. 

      Transverse

    • B. 

      Longitudinal

    • C. 

      Electromagnetic

    • D. 

      Sound waves

  • 7. 
      The displacement of ____________ waves is perpendicular to the direction of propagation
    • A. 

      Transverse

    • B. 

      Longitudinal

    • C. 

      Sound waves

    • D. 

      Surface wave of water

  • 8. 
     A transverse wave is an  ____________ motion.
    • A. 

      Irregular interval

    • B. 

      Interrupted rhythm.

    • C. 

      Oscillatory

    • D. 

      See-saw

  • 9. 
     Electromagnetic waves are produced by the acceleration of  _________________.
    • A. 

      An electric charge

    • B. 

      A magnetic field

    • C. 

      Irregular interval motion

    • D. 

      Oscillatory motion

  • 10. 
     Electromagnetic waves that travel along a transmission line from the source to the load are _____________ .
    • A. 

      Reflected waves

    • B. 

      Space quadrature

    • C. 

      Longitudinal waves

    • D. 

      Incident waves

  • 11. 
     Electromagnetic waves that travel from the load back toward the source are called _________________.
    • A. 

      Reflected waves.

    • B. 

      Space quadrature

    • C. 

      Longitudinal waves

    • D. 

      Incident waves

  • 12. 
     The distance of one cycle occurring in space is ____________.
    • A. 

      Wave velocity

    • B. 

      Frequency

    • C. 

      Wavelength

    • D. 

      Period

  • 13. 
     ___________________ is periodic and repetitive oscillations of electromagnetic wave
    • A. 

      Wave velocity

    • B. 

      Frequency

    • C. 

      Wavelength

    • D. 

      Period

  • 14. 
    It is defined as waves travel at various speed, depending on the type of wave and the characteristics of the propagation medium
    • A. 

      Wave velocity

    • B. 

      Frequency

    • C. 

      Wavelength

    • D. 

      Period

  • 15. 
    It comprised of two or more metallic conductors separated by a nonconductive insulating material.
    • A. 

      Open-wire

    • B. 

      Twin-lead

    • C. 

      Twisted pair

    • D. 

      Coaxial cable

  • 16. 
    It comprised of two or more metallic conductors   separated by the spacers with a continuous solid dielectric that ensures uniform spacing along the entire cable.
    • A. 

      Open-wire

    • B. 

      Twin-lead

    • C. 

      Twisted pair

    • D. 

      Coaxial cable

  • 17. 
    It is formed by twisting two insulated conductors around each other.
    • A. 

      Open-wire

    • B. 

      Twin-lead

    • C. 

      Twisted pair

    • D. 

      Coaxial cable

  • 18. 
    This cable consists of two copper wires where each wire is separately encapsulated in polyvinyl chloride insulation.
    • A. 

      Shielded twisted-pair

    • B. 

      Unshielded twisted-pair

    • C. 

      Coaxial cable

    • D. 

      Fiber optics

  • 19. 
    From the selection below, identify the disadvantage of using optical fiber technology.
    • A. 

      Fiber optic transmitters and receivers are still relatively expensive compared to electrical interfaces.

    • B. 

      Fiber optic networks operate at high speeds - up into the gigabits with large carrying capacity.

    • C. 

      Fiber optic cables costs much less to maintain.

    • D. 

      Fiber optics are immune to electromagnetic interference.

  • 20. 
    Which of the following is TRUE?
    • A. 

      The information on the conductor are more secured than optical fiber.

    • B. 

      Fiber optic cables sometimes produce sparks since they do have leakage current.

    • C. 

      There are no radiated magnetic fields around optical fibers; the electromagnetic fields are confined within the fiber.

    • D. 

      There is no loss of data when fiber optic cable is bent.

  • 21. 
    Thin glass center of the fiber where the light travels is ________________.
    • A. 

      Core

    • B. 

      Cladding

    • C. 

      Jacket

    • D. 

      Sheath

  • 22. 
    The outer optical material surrounding the thin glass center of the fiber that reflects the light back into this thin glass is __________________.
    • A. 

      Core

    • B. 

      Cladding

    • C. 

      Jacket

    • D. 

      Sheath

  • 23. 
    Plastic coating that protects the fiber from damage and moisture is ____________.
    • A. 

      Core

    • B. 

      Cladding

    • C. 

      Jacket

    • D. 

      Sheath

  • 24. 
    The bundles of 2 or more fiber cables are protected by the cable's outer covering, called ________________.
    • A. 

      Core

    • B. 

      Cladding

    • C. 

      Jacket

    • D. 

      Sheath

  • 25. 
    The transfer of information over a distance without the use of electrical conductors is through ___________________.
    • A. 

      Computer

    • B. 

      Coaxial cable

    • C. 

      Fiber optics

    • D. 

      Wireless transmission

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