Computer Fundamentals Aptitude Test

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.

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.

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.

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