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Welcome to the Physical Layer MCQs Page

Dive deep into the fascinating world of Physical Layer with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Physical Layer, a crucial aspect of Networking. In this section, you will encounter a diverse range of MCQs that cover various aspects of Physical Layer, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Networking.

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Check out the MCQs below to embark on an enriching journey through Physical Layer. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Networking.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Physical Layer. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Physical Layer MCQs | Page 7 of 24

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Q61.
___________ conversion involves three techniques: line coding, block coding, and scrambling.

a.

Analog-to-digital

b.

Digital-to-analog

c.

Analog-to-analog

d.

Digital-to-digital

Discuss
Answer: (d).Digital-to-digital
Q62.
________ is the process of converting digital data to a digital signal.

a.

Block coding

b.

Line coding

c.

Scrambling

d.

None of the above

Discuss
Answer: (b).Line coding
Q63.
_______ provides redundancy to ensure synchronization and inherent error detection.

a.

Block coding

b.

Line coding

c.

Scrambling

d.

None of the above

Discuss
Answer: (a).Block coding
Q64.
________ is normally referred to as mB/nB coding; it replaces each m-bit group with an n-bit group.

a.

Block coding

b.

Line coding

c.

Scrambling

d.

None of the above

Discuss
Answer: (a).Block coding
Q65.
________ provides synchronization without increasing the number of bits.

a.

Scrambling encoding

b.

Line coding

c.

Block coding

d.

None of the above

Discuss
Answer: (b).Scrambling
Q66.
Two common scrambling techniques are ________.

a.

NRZ and RZ

b.

AMI and NRZ

c.

B8ZS and HDB3

d.

Manchester and differential Manchester

Discuss
Answer: (c).B8ZS and HDB3
Q67.
The most common technique to change an analog signal to digital data is called __________.

a.

PAL

b.

PCM

c.

sampling

d.

none of the above

Discuss
Answer: (b).PCM
Q68.
The first step in PCM is ________.

a.

quantization

b.

modulation

c.

sampling

d.

none of the above

Discuss
Answer: (c).sampling
Q69.
There are three sampling methods: __________.

a.

quantized, sampled, and ideal

b.

ideal, sampled, and flat-top

c.

ideal, natural, and flat-top

d.

none of the above

Discuss
Answer: (c).ideal, natural, and flat-top
Q70.
______ finds the value of the signal amplitude for each sample; ____ finds the change from the previous sample.

a.

DM; PCM

b.

PCM; DM

c.

DM; CM

d.

none of the above

Discuss
Answer: (b).PCM; DM
Page 7 of 24

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