Transmission Media Questions

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1.

Transmission media are usually categorized as _______.

A

fixed or unfixed

B

guided or unguided

C

determinate or indeterminate

D

metallic or nonmetallic

Correct Answer: B

None.

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2.

Transmission media lie below the _______ layer.

A

physical

B

network

C

transport

D

application

Correct Answer: A

None.

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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

Correct Answer: B

None.

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4.

In fiber optics, the signal is _______ waves.

A

light

B

radio

C

infrared

D

very low-frequency

Correct Answer: A

None.

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5.

Which of the following primarily uses guided media?

A

cellular telephone system

B

local telephone system

C

satellite communications

D

radio broadcasting

Correct Answer: B

None.

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6.

Which of the following is not a guided medium?

A

twisted-pair cable

B

coaxial cable

C

fiber-optic cable

D

atmosphere

Correct Answer: D

None.

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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

Correct Answer: C

None.

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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

Correct Answer: A

None.

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9.

The inner core of an optical fiber is _______ in composition.

A

glass or plastic

B

copper

C

bimetallic

D

liquid

Correct Answer: A

None.

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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

Correct Answer: A

None.

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