# 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.

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 24 of 24

Q231.
A digitized voice channel is made by digitizing a 4-kHz bandwidth analog voice signal. We need to sample the signal at twice the highest frequency (two samples per hertz). We assume that each sample requires 8 bits. What is the required bit rate?
Q232.
What is the bit rate for high-definition TV (HDTV)?
Q233.
A device is sending out data at the rate of 1000 bps. How long does it take to send a file of 100,000 characters?
Q234.
A file contains 2 million bytes. How long does it take to download this file using a 56-Kbps channel?
Q235.
We need to send 265 kbps over a noiseless channel with a bandwidth of 20 kHz. How many signal levels do we need?
Q236.
Calculate the theoretical highest bit rate of a regular telephone line. The signal-to-noise ratio is usually 3162.
Q237.
Calculate the theoretical channel capacity. If SNR(dB) = 36 and the channel bandwidth is 2 MHz.
Q238.
A channel has a 1-MHz bandwidth. The SNR for this channel is 63. What is the appropriate bit rate?
Q239.
A channel has a 1-MHz bandwidth. The SNR for this channel is 63. What is the appropriate signel level?

a.

2

b.

8

c.

4

d.

16

Page 24 of 24

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