Computer Fundamentals Questions and Answers – Modulation Techniques

This set of Computer Fundamentals Questions and Answers for Aptitude test focuses on “Modulation Techniques”.

1. A coaxial cable has a bandwidth of _________ of megahertz.
a) 100
b) 150
c) 1000
d) 10000
View Answer

Answer: a
Explanation: A coaxial cable has a bandwidth of 100’s of Mhz. Baseband speed is in a few KHz. Multiplexing improves channel bandwidth utilization.

2. In TDM, the samples occupy adjacent time slots.
a) True
b) False
View Answer

Answer: a
Explanation: The statement is true. The TDM technique is based on sampling and they occupy adjacent slots and are transmitted in a sequence.

3. The carrier wave is a _________
a) tan wave
b) cosec wave
c) sine wave
d) cot wave
View Answer

Answer: c
Explanation: The carrier wave is generally a sine wave. Carrier wave is used to transfer the signal from source to destination.
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4. Controlling the phase is referred as __________
a) modulation
b) half modulation
c) amplitude modulation
d) phase modulation
View Answer

Answer: d
Explanation: It is referred to as phase modulation. When there is a change in amplitude, it is referred to as amplitude modulation.

5. A transmission mode that can transmit data in both the directions but transmits in only one direction at a time.
a) simplex
b) half duplex
c) full duplex
d) semi-duplex
View Answer

Answer: b
Explanation: The half duplex mode supports two way traffic but only in one direction at a time.
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6. A multiplexing technique based on sampling.
a) FDM
b) TDM
c) SDM
d) FM
View Answer

Answer: b
Explanation: TDM which stands for Time division multiplexing is based on sampling which is a modulation technique.

7. An example of FDM:
a) broadcast radio
b) telephone
c) machines
d) semi-duplex
View Answer

Answer: a
Explanation: Broadcast radio is an example of FDM. This allows several messages to be translated from baseband.
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8. FDM stands for?
a) Frequency Division Multiplexing
b) Frequency Dependent Multiplexing
c) Frequency Diverged Multiplexing
d) Frequency Derived Multiplexing
View Answer

Answer: a
Explanation: FDM stands for Frequency Division Multiplexing. This allows several messages to be translated from baseband, where they are all in the same frequency.

9. A modulation technique that improves channel bandwidth utilization.
a) direct
b) modulation
c) demodulation
d) multiplexing
View Answer

Answer: d
Explanation: Multiplexing is a modulation technique that improves channel bandwidth utilization.
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10. The purpose of communication system is to transfer information from _______ to the destination.
a) user
b) source
c) system
d) station
View Answer

Answer: b
Explanation: The answer is source. A communication system transfers information from source to the destination.

Sanfoundry Global Education & Learning Series – Computer Fundamentals.

To practice all areas of Computer Fundamentals for Aptitude test, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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