Chapter-wise Computer Networks Objective Questions and Answers

Questions

11 The loss of power a signal suffers as it travels from the transmitting computer to a receiving computer is :

A echo

B jitter

C spiking

D attenuation

View Answer Comment

Answer: Option [D]

Attenuation refers to the loss of signal strength during transmission.

12 An effective way to prevent attenuation is :

A adding repeaters or amplifiers to a circuit

B compressing a circuit

C shielding wires

D none of these above

View Answer Comment

Answer: Option [A]

Attenuation can be prevented by adding amplifiers or repeaters at approximately spaced points.

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13 Baud rate is :

A number of signal changes per second

B number of bits per second

C number of bytes per seconde

D number of ASCII characters per second

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Answer: Option [A]

Baud rate refers to the number of signal changes per second.

14 The maximum data rate that a medium of 10 KHz and signal to noise ratio of 30dB is roughly

A 10Kbps

B 30Kbps

C 100Kbps

D 3Kbps

View Answer Comment

Answer: Option [B]

Using channel capacity formula of Shannon : we get

C = W * log₂(1 + S/N)

30 dB S/N = 1000 S/N

C = 3000*log₂(1 + 1000)

C = 30 Kbps

15 Which of the following medium does not use metallic conductor for transmission ?

A Twisted pair

B Coaxial cable

C Optical fiber

D None of these above

View Answer Comment

Answer: Option [C]

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