In the name of ALLAH, the most beneficient, the most merciful

Data Communication (CS601)

Multiple Choice Questions (MCQs)

 

Objective Questions

Question

Asynchronous TDM is efficient only when the size of the time slot is kept relatively ________

  1. Large
  2. Small
  3. Medium
  4. Zero

Answer: 1 Chapter No. 30 

Question

WDM stands for _________.

  1. Wave Division Multiplexing
  2. Wrong Division Multiplexing
  3. Well Division Multiplexing
  4. West Division Multiplexing

Answer: 1 Chapter No. 29 

Question

In Synchronous TDM, Time slots are not same in number as input devices.

  1. True
  2. False

Answer: 2 Chapter No. 29 

Question

dB is negative if a signal is __________.

  1. Attenuated
  2. Distorted
  3. Amplified
  4. Noisy

Answer: 1 Chapter No. 28 

Question

A broadcast signal is received by the orbiting satellites which rebroadcasts __________.

  1. to the resender
  2. to the sender
  3. to the atmosphere
  4. none of the given

Answer: 4 Chapter No. 26 

Question

In _________, a signal is directed straight from antenna to antenna.

  1. Line of sight propagation
  2. Ground propagation
  3. Space propagation
  4. Tropospheric propagation

Answer: 1 Chapter No. 26 

Question

Radio wave transmission utilizes ___________ different types of propagation.

  1. Two
  2. Three
  3. Four
  4. Five

Answer: 4 Chapter No. 26 

Question

TROPOSHERE is the layer of atmosphere above the troposhere but below space

  1. True
  2. False

Answer: 2 Chapter No. 26 

Question

STP is more expensive than UTP and is less susceptible to noise.

  1. True
  2. False

Answer: 1 Chapter No. 25 

Question

There are __________types of guided media.

  1. 2
  2. 3
  3. 4
  4. 5

Answer: 2 Chapter No. 24 

Question

Data is transmitted using light through a __________ cable.

  1. twisted pair
  2. fiber-optic
  3. coaxial
  4. microwave

Answer: 2 Chapter No. 24 

Question

Following characteristics fully describe ____________.
Amplitude
Period/Frequency
Phase

  1. Sine Waves
  2. Digital Signals
  3. Aperiodic Signals
  4. None of the given

Answer: 1 Chapter No. 17 

Question

In analog transmission, the base signal is called the________.

  1. Carrier Signal
  2. Analog signal
  3. Digital signal
  4. Modulated signal

Answer: 1 Chapter No. 17 

Question

In ASK, Noise usually affects the ________.

  1. Amplitude
  2. Phase
  3. Sample
  4. Frequency

Answer: 1 Chapter No. 17 

Question

In ASK, both ______ and ________ remain constant.

  1. Amplitude, Frequency
  2. Amplitude, phase
  3. Frequency, Phase
  4. Amplitude, Samples

Answer: 3 Chapter No. 17 

Question

Quantization is a method of assigning ________ values in a specific range to sampled instances.

  1. Negative
  2. Positive
  3. Binary
  4. Integral

Answer: 4 Chapter No. 16 

Question

Which of the following statement is correct?

  1. Digital signals are less prone to Noise
  2. Digital signals are highly prone to Noise
  3. Analog Signals are less prone to Noise
  4. Digital signals are not affected by Noise

Answer: 1 Chapter No. 16 

Question

In the encoding where positive to negative transition is one and vice versa is zero?

  1. Manchester
  2. Differential Manchester
  3. All of above
  4. None of given

Answer: 4 Chapter No. 15 

Question

Encoding digital data into digital signals is called _____________.

  1. Analog-to-Digital Conversion
  2. Digital-to-Digital Conversion
  3. Digital-to-Analog Conversion
  4. None of above

Answer: 2 Chapter No. 14 

Question

RZ stands for ____________.

  1. Return to Z
  2. Retire a Zero
  3. Return ot Zero
  4. None of above

Answer: 3 Chapter No. 14 

Question

Digitizing an Analog Signal is called ___________.

  1. Analog-to-Digital Conversion
  2. Digital-to-Digital Conversion
  3. Digital-to-Analog Conversion
  4. None of above

Answer: 1 Chapter No. 14 

Question

The level of signal is always positive in NRZ encoding.

  1. true
  2. false

Answer: 2 Chapter No. 14 

Question

The inversion of the level represents a 1 bit in ______ encoding

  1. NRZ-I
  2. NRZ-L
  3. RZ
  4. Manchester

Answer: 1 Chapter No. 14 

Question

________ encoding is almost obsolete today

  1. Bipolar
  2. Unipolar
  3. Polar
  4. None of the given

Answer: 2 Chapter No. 14 

Question

What is the Bandwidth of a periodic signal if it is decomposed into 4 sine waves with frequencies 300, 600, 900 and 1200?

  1. 100
  2. 900
  3. 300
  4. 600

Answer: 2 Chapter No. 13 

Question

__________ of a signal is the collection of all the component frequencies it contains

  1. Time domain
  2. Frequency domain
  3. Frequency spectrum
  4. None of above

Answer: 3 Chapter No. 13 

Question

What is the Bandwidth of a periodic signal if it is decomposed into 4 sine waves with frequencies 200, 400, 600 and 800?

  1. 100
  2. 500
  3. 300
  4. 600

Answer: 4 Chapter No. 13 

Question

What is the period of a Sine wave having frequency of 10 Hz?

  1. 0.2
  2. 0.1
  3. 0.5
  4. 0.3

Answer: 2 Chapter No. 12 

Question

What is the period of a Sine wave having frequency of 5 Hz.

  1. 0.2
  2. 0.1
  3. 0.5
  4. 0.3

Answer: 1 Chapter No. 12 

Question

What is the frequency of a sine wave if it completes one cycle in 2 seconds?

  1. 0.5
  2. 0.6
  3. 0.3
  4. 0.2

Answer: 1 Chapter No. 12 

Question

What is the period of a Sine wave having frequency of 2 Hz.

  1. 0.2
  2. 0.1
  3. 0.5
  4. 0.3

Answer: 3 Chapter No. 12 

Question

Time domain shows changes in __________.

  1. time w.r.t signal amplitude
  2. signal amplitude w.r.t time
  3. time
  4. All of above

Answer: 2 Chapter No. 12 

Question

Time domain plot show changes in signal phase with respect to time.

  1. true
  2. false

Answer: 2 Chapter No. 12 

Question

What is the frequency of a sine wave if it completes one cycle in 5 seconds?

  1. 0.5
  2. 0.6
  3. 0.3
  4. 0.2

Answer: 4 Chapter No. 12 

Question

Digital signals are refers to be _____________.

  1. Continuous
  2. Discrete
  3. All of above
  4. None

Answer: 2 Chapter No. 11 

Question

Human voice is example of _________ signal.

  1. Digital
  2. Analog
  3. Discrete
  4. None of the given

Answer: 2 Chapter No. 11 

Question

Analog refers to something that is continuous in _________.

  1. Time
  2. Space
  3. Frequency
  4. None of the given

Answer: 1 Chapter No. 11 

Question

A sine wave is ________.

  1. periodic and discrete
  2. aperiodic and discrete
  3. periodic and continuous
  4. aperiodic and continuous

Answer: 3 Chapter No. 11 

Question

________ is the rate of change with respect to time.

  1. Voltage
  2. Time
  3. Frequency
  4. Amplitude

Answer: 4 Chapter No. 11 

Question

Analog signals are refers to be

  1. Continuous
  2. Discrete
  3. Periodic
  4. Aperiodic

Answer: 1 Chapter No. 11 

Question

Each computer on the Internet has a unique numeric address called a(n)

  1. domain address
  2. protocol address
  3. IP address
  4. Web address

Answer: 3 Chapter No. 10 

Question

Like Data link layer, ________ is also responsible for Flow control.

  1. Transport Layer
  2. Session Layer

Answer: 1 Chapter No. 9 

Question

Which layer is concerned with the syntax and semantics of info exchange between two systems?

  1. Physical
  2. Application
  3. Session
  4. Presentation

Answer: 4 Chapter No. 9 

Question

Session layer is responsible for _________.

  1. Reassembly of data
  2. Maintaining the connection

Answer: 2 Chapter No. 9 

Question

Which level of the TCP/IP reference model routes data/information across a network channel?

  1. Application Layer
  2. Data Link Layer
  3. Transport Layer
  4. Network Layer

Answer: 4 Chapter No. 8 

Question

In OSI model headers are added at layer _________.

  1. 1,2,3 only
  2. 6,5,7 only
  3. 5,4,3 only
  4. 6,5,4,3,2 only

Answer: 4 Chapter No. 7 

Question

The Internet is __________________.

  1. software for sending e-mail around the world
  2. a government-owned agency that links computers
  3. a global network of computers networks
  4. a specialised form of local area network

Answer: 3 Chapter No. 7 

Question

In __________ a dedicated communication path is established between two stations through the nodes of the network

  1. Circuit switching
  2. Packet switching

Answer: 1 Chapter No. 6 

Question

Traditionally MANs have been implemented using one of the 2 technologies, Circuit Switching and Packet Switching

  1. true
  2. false

Answer: 2 Chapter No. 6 

Question

Central Hub in a Tree is an ________.

  1. Active hub
  2. passive hub

Answer: 1 Chapter No. 5 

Question

________ contains a repeater.

  1. Active hub
  2. Passive hub

Answer: 1 Chapter No. 5 

Question

There are three types of Hubs that exist. Which of the following options correctly describes these three?

  1. Passive, dormant, special
  2. Active , dormant , passive
  3. Passive, Active, Turbo
  4. Passive, Active, Intelligent

Answer: 4 Chapter No. 5 

Question

A portion of the path that carries TX between a given pair of devices is known as ___________.

  1. Direct Point
  2. Bridge
  3. Channel
  4. Access Point

Answer: 3 Chapter No. 4 

Question

Line Configuration refers to the way two or more devices attach to a __________.

  1. Path
  2. Circuit
  3. Link
  4. Router

Answer: 3 Chapter No. 4 

Question

If users must take turns using the link, then it is called Spatial Sharing.

  1. true
  2. false

Answer: 2 Chapter No. 4 

Question

By using ________ system, change in the file contents during file transmission can be avoided.

  1. Routing
  2. Flow Control
  3. Error Detection and Correction
  4. Congestion Control

Answer: 3 Chapter No. 3 

Question

To make sure that source does not overwhelm destination by sending data faster than it can be handled and processed is called?

  1. Addressing & Routing
  2. Exchange Management
  3. Flow Control
  4. Recovery

Answer: 3 Chapter No. 3 

Question

The transmission medium that carries the message is referred to as the __________.

  1. send and receive device
  2. communication channel
  3. protocol
  4. gateways

Answer: 2 Chapter No. 2 

Question

Two or more computers connected so that they can communicate with each other and share information is called a

  1. satellite
  2. protocol
  3. broadcast
  4. network

Answer: 4 Chapter No. 1 

Question

Is there any difference between Data communication and telecommunication are network?

  1. Yes
  2. No

Answer: 2 Chapter No. 1 

Question

A ______________ modem is used to connect two DTEs directly.

  1. Cable
  2. DSL
  3. None of the given

Answer: Chapter No.  

Question

A sine wave is defined by _______ characteristics.

  1. 2
  2. 3
  3. 4
  4. 5

Answer: 2 Chapter No.  

Question

AM signal requires __________ the BW of original signal

  1. Twice
  2. Half
  3. Same
  4. Three Times

Answer: 1 Chapter No.  

Question

Analog To Analog Conversion Methods include __________.

  1. AM, PM and FM
  2. AM, FSK and PM
  3. AM, PM and QAM
  4. None of the given

Answer: Chapter No.  

Question

Asynchronous transmission is ___________

  1. Slow
  2. Fast
  3. Costly
  4. None effective

Answer: 1 Chapter No.  

Question

At the CRC checker, ________ means that the data unit is damaged.

  1. A string of 0s
  2. A string of 1s
  3. A string of alternating 1s and 0s
  4. A nonzero remainder

Answer: Chapter No.  

Question

At the CRC generator, ___________ added to the data unit before the divisional process.

  1. 0s are
  2. 1s are
  3. a polynomial is
  4. a CRC remainder is

Answer: Chapter No.  

Question

Baud rate is greater than or equal to the bit rate.

  1. True
  2. False

Answer: Chapter No.  

Question

BSC supports _____________ transmission using ______________ flow control.

  1. Full-duplex, Stop and wait ARQ
  2. Half-duplex, Selective reject ARQ
  3. Full-duplex, Selective reject ARQ
  4. Half-duplex, Stop and wait ARQ

Answer: 4 Chapter No.  

Question

Human voice is example of _________ signal.

  1. Digital
  2. Analog
  3. Discrete
  4. None of the given

Answer: Chapter No.  

Question

If the window size is 63 in go-back N ARQ then what is the range of sequence number?

  1. 0 to 63
  2. 0 to 64
  3. 1 to 63
  4. 1 to 64

Answer: Chapter No.  

Question

In ____________, both peak amplitude and frequency remains constant as the phase changes.

  1. PSK
  2. QAM
  3. Both PSK & QAM
  4. None of the given

Answer: 1 Chapter No.  

Question

In CRC there is no error if the remainder at the receiver is _______.

  1. Equal to the remainder at the sender
  2. Zero
  3. Nonzero
  4. The quotient at the sender

Answer: Chapter No.  

Question

Line Configuration refers to the way two or more devices attach to a __________.

  1. Path
  2. Circuit
  3. Link
  4. Router

Answer: 3 Chapter No.  

Question

PSK is susceptible to the noise degradation.

  1. True
  2. False

Answer: Chapter No.  

Question

Radio is an example of _______ signal conversion.

  1. Analog to analog
  2. Analog to digital
  3. Digital to Digital
  4. Digital to analog

Answer: 1 Chapter No.  

Question

Sampling means measuring ____________ of signal at equal intervals

  1. Amplitudes
  2. Frequencies
  3. Phases
  4. None of the given

Answer: Chapter No.  

Question

Terminal, microprocessor, computer, printer or any other device that generates or consumes digital data is known as ___________

  1. DCE
  2. DTE
  3. DCE & DTE
  4. None of the given

Answer: 2 Chapter No.  

Question

The __________ generates the data and passes it along with any control information to a __________.

  1. DTE, DCE
  2. DCE, DTE
  3. DTE, DTE
  4. DCE, DCE

Answer: Chapter No.  

Question

The term _______means that only one bit of a given data unit is changed from 1 to 0 or from 0 to 1.

  1. Packet Error.
  2. Burst Error
  3. Single Bit Error
  4. Character Error

Answer: Chapter No.  

Question

There are _________ types of serial transmission.

  1. 3
  2. 4
  3. 2
  4. None of the given

Answer: Chapter No.  

Question

Which error detection method consists of a parity bit for each unit as well as an entire data unit of parity bits?

  1. Checksum
  2. Cyclic Redundancy Check (CRC)
  3. Longitudinal Red Check (LRC)
  4. Vertical Redundancy Check (VRC)

Answer: Chapter No.  

Question

Which error detection method uses one's complement arithmetic.

  1. Cyclic Redundancy Check (CRC)
  2. Longitudinal Red Check (LRC)
  3. Checksum
  4. Simple Parity Check

Answer: Chapter No.  

Question

Which of the following consist of just one redundant bit per data unit?

  1. Two dimentional Parity check.
  2. CRC
  3. Simple Parity Check
  4. Checksum

Answer: Chapter No.  

Question

Which of the following is most affected by noise?

  1. PSK
  2. ASK
  3. FSK
  4. QAM

Answer: Chapter No.  

Question

Which one is not the function of data link layer?

  1. Line discipline
  2. Flow control
  3. Error control
  4. Network control

Answer: Chapter No.