Multiple Choice Quiz (See related pages) 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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