This set of Data communication and Networking Multiple Choice Questions and Answers (MCQs) focuses on “Transmission Media – Guided Media – Twisted Pair Cable, Coaxial Cable, Fiber-Optic Cable ”.

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1. The frequency range of visible light is _______ than the frequency range used in radio communication

  • lower
  • higher
  • the same as
  • depends on the medium

2. Which of the following is usually not classified as a guided medium?

  • twisted-pair cable
  • fiber-optic cable
  • coaxial cable
  • troposphere

3. _______ consists of 2 conductors twisted round each other.

  • twisted-pair cable
  • fiber-optic cable
  • coaxial cable
  • microwave cable

4. _______ has an inner conductor and an outer conductor separated by insulation

  • twisted-pair cable
  • fiber-optic cable
  • coaxial cable
  • all of the above

5. Category 5 UTP cables _______ Category 1 cables.

  • transmit data at lower rates than
  • transmit data at higher rates than
  • are unsuitable for voice transmission compared to
  • have less twists per foot than
  • flexibility
  • low cost
  • ease of installation
  • all of the above

7. The most frequently used UTP connector is _______.

  • category 5 connector
  • EIA 232
  • RJ45
  • JR45

8. One of the benefits of encasing a twisted-pair cable in a metal foil covering is the _______

  • reduction of crosstalk
  • increase of crosstalk
  • increase in flexibility
  • decrease in costs

9. _______ cable carries signals of higher frequency ranges than _______ cable.

  • Twisted-pair; coaxial
  • Twisted-pair; fiber-optic
  • Coaxial; twisted-pair
  • none of the above

10. The outer metallic sheath in coaxial cable functions as _______.

  • a connector
  • a second conductor
  • a shield against noise
  • b and c
  • twisted-pair
  • shielded twisted-pair
  • coaxial
  • fiber-optic

12. A _______ is a device that prevents the signal at the end of a bus backbone from echoing back on to the line

  • repeater
  • horn antenna
  • T-connector
  • terminator

13. The core of an optical fiber is _______

  • glass
  • plastic
  • metal
  • a or b

14. Light travels at _______ in a vacuum.

  • 300,000 km/s
  • 300,000 miles/s
  • 300,000 m/s
  • 186,000 m/s

15. Light travels at _______ in the atmosphere.

  • less than 186,000 miles/s
  • greater than 186,000 miles/s
  • 186,000 miles/s
  • 186,000 m/s

16. As a beam of light goes from the air into a body of water, its speed _______.

  • increases
  • decreases
  • remains the same
  • doubles

17. The angle of _______ is measured with respect to the vertical axis.

  • incidence
  • reflection
  • refraction
  • all of the above

18. When the angle of _______ is 90 degrees the angle of _______ is equal to the critical angle.

  • incidence; refraction
  • refraction; incidence
  • refraction; reflection
  • reflection; refraction

19. There is no reflection until the angle of incidence is greater than the _______ angle

  • critical
  • refractive
  • horizontal
  • vertical

20. When a light beam is reflected back into the medium, the angle of _______ equals the angle of _______.

  • incidence; reflection
  • incidence; refraction
  • reflection; refraction
  • refraction; recursion

21. In which propagation mode does the light source move through the core in different paths?

  • multimode step-index
  • multimode graded-index
  • single mode
  • a and b

22. In which propagation mode is the core a uniform single density?

  • multimode step-index
  • multimode graded-index
  • single mode
  • a and c

23. In which propagation mode is the core of varying density?

  • multimode step-index
  • multimode graded-index
  • single mode
  • a and b

24. A beam of light is least distorted in a _______ fiber

  • multimode step-index
  • multimode graded-index
  • single mode step-index
  • a and b

25. The _______ surrounds the _______ in a fiber-optic cable.

  • fiber; cladding
  • core; fiber
  • core; cladding
  • cladding; core

26. An _______ provides a light source that can be focused to a very narrow range allowing control over the angle of incidence

  • ILD
  • LED
  • IED
  • EFF

27. As a light source for fiber-optic cable, _______ though inexpensive, can only be used for short-distance use

  • ILD
  • LED
  • IED
  • EFF

28. _______ cable is not susceptible to most noise that is electrical in nature.

  • Twisted-pair
  • Shielded twisted-pair
  • Coaxial
  • Fiber-optic

29. For refraction to occur, the _______ must be of a lower density than the _______

  • cladding; core
  • core; cladding
  • cladding; jacket
  • core; Teflon coating

30. The transmission of a signal through fiber-optic cable is most affected by _______.

  • electric motors
  • heat
  • lightning
  • external light

31. Which factor makes twisted-pair cable superior to fiber-optic cable?

  • signal attenuation
  • noise resistance
  • bandwidth range
  • cost

32. Which factor makes fiber-optic cable superior to twisted-pair cable?

  • cost
  • maintenance
  • robustness
  • bandwidth range
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