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 ”.
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
6. UTP is popular in LAN technology due to its _______
- 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
11. The most popular connector used with _______ cable is the BNC.
- 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