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Multiple Choice Quiz
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Please answer all questions.

1

Transmission media are usually categorized as _______.
A)fixed or unfixed
B)guided or unguided
C)determinate or indeterminate
D)metallic or nonmetallic
2

Transmission media lie below the _______ layer.
A)physical
B)network
C)transport
D)application
3

_______ cable consists of an inner copper core and a second conducting outer sheath.
A)Twisted-pair
B)Coaxial
C)Fiber-optic
D)Shielded twisted-pair
4

In fiber optics, the signal is _______ waves.
A)light
B)radio
C)infrared
D)very low-frequency
5

Which of the following primarily uses guided media?
A)cellular telephone system
B)local telephone system
C)satellite communications
D)radio broadcasting
6

Which of the following is not a guided medium?
A)twisted-pair cable
B)coaxial cable
C)fiber-optic cable
D)atmosphere
7

What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair cable?
A)inner conductor
B)diameter of cable
C)outer conductor
D)insulating material
8

In an optical fiber, the inner core is _______ the cladding.
A)denser than
B)less dense than
C)the same density as
D)another name for
9

The inner core of an optical fiber is _______ in composition.
A)glass or plastic
B)copper
C)bimetallic
D)liquid
10

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)reflection
B)refraction
C)incidence
D)criticism
11

When the angle of incidence is _______ the critical angle, the light beam bends along the interface.
A)more than
B)less than
C)equal to
D)none of the above
12

Signals with a frequency below 2 MHz use _______ propagation.
A)ground
B)sky
C)line-of-sight
D)none of the above
13

Signals with a frequency between 2 MHz and 30 MHz use ______ propagation.
A)ground
B)sky
C)line-of-sight
D)none of the above
14

Signals with a frequency above 30 MHz use _______propagation.
A)ground
B)sky
C)line-of-sight
D)none of the above
15

A parabolic dish antenna is a(n) _______ antenna.
A)omnidirectional
B)bidirectional
C)unidirectional
D)horn
16

A(n) _____ medium provides a physical conduit from one device to another.
A)guided
B)unguided
C)either (a) or (b)
D)none of the above
17

________ cable consists of two insulated copper wires twisted together.
A)Coaxial
B)Fiber-optic
C)Twisted-pair
D)none of the above
18

_______ cable is used for voice and data communications.
A)Coaxial
B)Fiber-optic
C)Twisted-pair
D)none of the above
19

__________ consists of a central conductor and a shield.
A)Coaxial
B)Fiber-optic
C)Twisted-pair
D)none of the above
20

_____ cable can carry signals of higher frequency ranges than _____ cable.
A)Twisted-pair; fiber-optic
B)Coaxial; fiber-optic
C)Coaxial; twisted-pair
D)none of the above
21

______ cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outside jacket.
A)Coaxial
B)Fiber-optic
C)Twisted-pair
D)none of the above
22

______ cables carry data signals in the form of light.
A)Coaxial
B)Fiber-optic
C)Twisted-pair
D)none of the above
23

In a fiber-optic cable, the signal is propagated along the inner core by _______.
A)reflection
B)refraction
C)modulation
D)none of the above
24

_________ 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
25

Radio waves are _________.
A)omnidirectional
B)unidirectional
C)bidirectional
D)none of the above
26

Microwaves are _________.
A)omnidirectional
B)unidirectional
C)bidirectional
D)none of the above
27

_______ are used for cellular phone, satellite, and wireless LAN communications.
A)Radio waves
B)Microwaves
C)Infrared waves
D)none of the above
28

________ are used for short-range communications such as those between a PC and a peripheral device.
A)Radio waves
B)Microwaves
C)Infrared waves
D)none of the above





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