Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. When the angle of incidence is ____________ the critical angle, the light beam bends along the interface.
A) less than
B) equal to
C) more than
D) none of the above
Answer: Option B
Solution:
2. Transmission media lie below the __________ layer.
A) application
B) transport
C) network
D) physical
Answer: Option D
Solution:
3. _________ cable consists of an inner copper core and a second conducting outer sheath.
A) Twisted-pair
B) Shielded twisted-pair
C) Coaxial
D) Fiber-optic
Answer: Option C
Solution:
4. __________ consists of a central conductor and a shield.
A) Twisted-pair
B) Coaxial
C) Fiber-optic
D) none of the above
Answer: Option B
Solution:
5. _______ cable can carry signals of higher frequency ranges than _______ cable.
A) Coaxial; twisted-pair
B) Twisted-pair; fiber-optic
C) Coaxial; fiber-optic
D) none of the above
Answer: Option A
Solution:
6. _________ are used for cellular phone, satellite, and wireless LAN communications.
A) Radio waves
B) Infrared waves
C) Microwaves
D) none of the above
Answer: Option C
Solution:
7. The inner core of an optical fiber is _________ in composition.
A) copper
B) glass or plastic
C) bimetallic
D) liquid
Answer: Option B
Solution:
8. What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair cable?
A) insulating material
C) diameter of cable
Answer: Option D
Solution:
9. Signals with a frequency below 2 MHz use _______ propagation.
A) line-of-sight
B) sky
C) ground
D) none of the above
Answer: Option C
Solution:
10. In an optical fiber, the inner core is _________ the cladding.
A) less dense than
B) denser than
C) the same density as
D) another name for
Answer: Option B
Solution:
11. ________ cable consists of two insulated copper wires twisted together.
A) Twisted-pair
B) Coaxial
C) Fiber-optic
D) none of the above
Answer: Option A
Solution:
12. In fiber optics, the signal is __________ waves.
A) radio
B) light
C) infrared
D) very low-frequency
Answer: Option B
Solution:
13. Signals with a frequency above 30 MHz use _______propagation.
A) line-of-sight
B) sky
C) ground
D) none of the above
Answer: Option A
Solution:
14. A parabolic dish antenna is a(n) ___________ antenna.
A) unidirectional
B) bidirectional
C) omnidirectional
D) horn
Answer: Option A
Solution:
15. A(n) _______ medium provides a physical conduit from one device to another.
A) unguided
B) guided
C) either (a) or (b)
D) none of the above
Answer: Option B
Solution:
16. ________ cable is used for voice and data communications.
A) Twisted-pair
B) Coaxial
C) Fiber-optic
D) none of the above
Answer: Option A
Solution:
17. Signals with a frequency between 2 MHz and 30 MHz use _______ propagation.
A) ground
B) line-of-sight
C) sky
D) none of the above
Answer: Option C
Solution:
18. Transmission media are usually categorized as ___________.
A) determinate or indeterminate
B) fixed or unfixed
C) guided or unguided
D) metallic or nonmetallic
Answer: Option C
Solution:
19. ________ are used for short-range communications such as those between a PC and a peripheral device.
A) Radio waves
B) Infrared waves
C) Microwaves
D) none of the above
Answer: Option B
Solution:
20. _________ media transport electromagnetic waves without the use of a physical conductor.
A) Guided
B) Unguided
C) Either (a) or (b)
D) None of the above
Answer: Option B
Solution:
21. ________ cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outside jacket.
A) Twisted-pair
B) Coaxial
C) Fiber-optic
D) none of the above
Answer: Option C
Solution:
22. Which of the following primarily uses guided media?
C) local telephone system
Answer: Option C
Solution:
23. When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, _______ occurs.
A) refraction
B) reflection
C) criticism
D) incidence
Answer: Option B
Solution:
24. Which of the following is not a guided medium?
A) fiber-optic cable
C) twisted-pair cable
D) atmosphere
Answer: Option D
Solution:
25. Microwaves are _________.
A) omnidirectional
B) bidirectional
C) unidirectional
D) none of the above
Answer: Option C
Solution:
26. ________ cables carry data signals in the form of light.
A) Twisted-pair
B) Coaxial
C) Fiber-optic
D) none of the above
Answer: Option C
Solution:
27. Radio waves are _________.
A) unidirectional
B) omnidirectional
C) bidirectional
D) none of the above
Answer: Option B
Solution:
28. In a fiber-optic cable, the signal is propagated along the inner core by __________.
A) refraction
B) reflection
C) modulation
D) none of the above
Answer: Option B
Solution:
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Complete List of Chapter Quiz in Data Communications and Networking
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