Forouzan Chapter 7 MCQ

Question 1

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

Answer 1

equal to

Question 2

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

Answer 2

physical

Question 3

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

Answer 3

Coaxial

Question 4

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

Answer 4

Coaxial

Question 5

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

Answer 5

Coaxial; twisted-pair

Question 6

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

Answer 6

Microwaves

Question 7

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

Answer 7

glass or plastic

Question 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
B) inner conductor D) outer conductor

Answer 8

outer conductor

Question 9

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

Answer 9

ground

Question 10

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

Answer 10

denser than

Question 11

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

Answer 11

Twisted-pair

Question 12

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

Answer 12

light

Question 13

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

Answer 13

line-of-sight

Question 14

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

Answer 14

unidirectional

Question 15

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

Answer 15

guided

Question 16

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

Answer 16

Twisted-pair

Question 17

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

Answer 17

sky

Question 18

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

Answer 18

guided or unguided

Question 19

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

Answer 19

Infrared waves

Question 20

. _________ media transport electromagnetic waves without the use of a physical conductor.
A) Guided C) Either (a) or (b)
B) Unguided D) None of the above

Answer 20

Unguided

Question 21

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

Answer 21

Fiber-optic

Question 22

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

Answer 22

local telephone system

Question 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 C) criticism
B) reflection D) incidence

Answer 23

reflection

Question 24

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

Answer 24

atmosphere

Question 25

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

Answer 25

unidirectional

Question 26

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

Answer 26

Fiber-optic

Question 27

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

Answer 27

omnidirectional

Question 28

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

Answer 28

reflection