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Free download in PDF Data Communication Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
21
In _______ transmission, the channel capacity is shared by both communicating devices at all times.
A
simplex
B
half-duplex
C
full-duplex
D
half-simplex
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22
________ is an idea or concept that is a precursor to an Internet standard.
A
RCF
B
ID
C
RFC
D
none of the above
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23
An unauthorized user is a network _______ issue.
A
Security
B
Reliability
C
Performance
D
All the above
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24
_______ refers to the structure or format of the data, meaning the order in which they are presented.
A
Semantics
B
Syntax
C
Timing
D
All of the above
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25
In a _______ connection, more than two devices can share a single link.
A
multipoint
B
point-to-point
C
primary
D
secondary
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26
The _______ is the physical path over which a message travels.
A
Protocol
B
Signal
C
Medium
D
All the above
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27
Which topology requires a central controller or hub?
A
Mesh
B
Bus
C
Star
D
Ring
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28
Communication between a computer and a keyboard involves ______________ transmission.
A
simplex
B
half-duplex
C
full-duplex
D
automatic
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29
In the original ARPANET, _______ were directly connected together.
A
routers
B
host computers
C
networks
D
IMPs
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30
Which organization has authority over interstate and international commerce in the communications field?
A
FCC
B
IEEE
C
ITU-T
D
ISOC
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31
In a ________ connection, three or more devices share a link.
A
point-to-point
B
multipoint
C
(a) and (b)
D
none of the above
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32
In a frequency-domain plot, the horizontal axis measures the ________.
A
phase
B
frequency
C
slope
D
peak amplitude
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33
For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate.
A
low-pass
B
bandpass
C
noisy
D
noiseless
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34
If the available channel is a ____ channel, we cannot send a digital signal directly to the channel.
A
low-pass
B
low rate
C
bandpass
D
high rate
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35
As frequency increases, the period ________.
A
increases
B
decreases
C
doubles
D
remains the same
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36
Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A.
A
one-half
B
twice
C
the same as
D
indeterminate from
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37
_______ describes the position of the waveform relative to time 0.
A
Amplitude
B
Phase
C
Frequency
D
Voltage
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38
________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.
A
Noise
B
Distortion
C
Attenuation
D
Decibel
View Answer
39
The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal.
A
period
B
bandwidth
C
frequency
D
amplitude
View Answer
40
A periodic signal completes one cycle in 0.001 s. What is the frequency?
A
1 Hz
B
100 Hz
C
1 KHz
D
1 MHz
View Answer
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