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

Data Communication (CS601)

Multiple Choice Questions (MCQs)

Objective Questions

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

    1. Yes
    2. No

  2. 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

  3. ________ category of coaxial cable is used for Cable TV.

    1. RG-58
    2. RG-59
    3. RG-11
    4. RG-47

  4. The logical connection between the peer layers is ________ connection.

    1. Physical
    2. Direct
    3. Indirect
    4. Tengible

  5. ________ is normally used where speed is priority in data transfer.

    1. Serial data transmission
    2. Hybrid data transmission
    3. Parallel data transmission
    4. Both parallel and serial data transmission

  6. In Pulse Code Modulation (PCM), the sampling is dependent on ________.

    1. Time
    2. Amplitude
    3. Frequency
    4. Signal Rate

  7. A fiber -optic cable transmit signals in the form of ________.

    1. Light
    2. Sound
    3. Wave
    4. None of the given

  8. There are ________ basic categories of multiplexing.

    1. 2
    2. 3
    3. 7
    4. 5

  9. ________ signal can take infinite levels of intensity over time.

    1. Digital
    2. Discrete
    3. Analog
    4. Logical

  10. ________ relatively measures the strength of two signals.

    1. Signal rate
    2. Bit rate
    3. Decibel
    4. Pulse Rate

  11. ________ is correct formula to determine the total number of ports needed for one system connected in a mesh network.

    1. N+1
    2. N-1
    3. N(N+1)
    4. NxN

  12. To calculate the data rate for noisy channel ________ formula is used.

    1. Shannon
    2. Nyquist
    3. Propagation
    4. Greedy

  13. In circuit switched networks we have low efficiency but minimal ________.

    1. Delay
    2. Speed
    3. Throughput
    4. Errors

  14. We can have ________ different groups with a 4 bit block.

    1. 4
    2. 8
    3. 16
    4. 32

  15. VCI address is ________ address in virtual circuit approach.

    1. Private
    2. Variable
    3. Local
    4. Global

  16. In ASK correct formula for calculating the bandwidth ia as ________.

    1. B=(1+d)S
    2. B=(1*d)S
    3. B=(d-1)S
    4. B=(d-5)S

  17. Guard bands are used in ________ multiplexing technique, to avoid overlapping of frequency bands assigned to each user.

    1. PDM
    2. CSMA
    3. TDM
    4. FDM

  18. Mr. Asif while sitting in Lahore is talking with his friend in Dubai through Skype is an example of ________.

    1. Local Area Network
    2. Metropolitan Area Network
    3. Wide Area Network
    4. Home Based Network

  19. WDM stands for ________.

    1. Wideband De-Modulation
    2. Worst Data Manipulation
    3. Wavelength Division Multiplexing
    4. None of the given

  20. Switch is a network device which operates on the ________ layer of the TCP/IP protocol suite.

    1. Application
    2. Transport
    3. Presentation
    4. Data link

  21. Signals travel through fiber optic cable are in the form of ________.

    1. Light
    2. Bits
    3. Electromagnetic
    4. Bytes

  22. ________ category of coaxial cable is used for thin Ethernet.

    1. RG-58
    2. RG-59
    3. RG-1
    4. RG-47

  23. In statistical time division multiplexing, number of slots in frame are less than ________.

    1. Output data rate
    2. Input lines
    3. Input frequency
    4. Multiplexed T lines

  24. Latency is made of ________ components.

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

  25. In TCP/IP protocol suite, the process of adding header at each layer on sending side is known as ________.

    1. Encapulation
    2. De-encapulation
    3. Packetizing
    4. Framing

  26. The most common type of connector used by coaxial cable is ________.

    1. BNC
    2. RJ-45
    3. RJ-11
    4. RJ-57

  27. Low pass channel has ________ bandwidth between two stations.

    1. Dedicated
    2. Shared
    3. Multiplexed
    4. Infinite

  28. ________ mode of serial transmission guarantees fixed rate of data.

    1. Synchronous
    2. Asynchronous
    3. Isochronous
    4. Metasochronous

  29. At the Application layer, object/information is in the form of ________.

    1. Message
    2. Packet
    3. Segment
    4. Frame

  30. Which of the following is not a characteristic of a sine wave?

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

  31. Quadrature Amplitude Modulation (QAM) is the combination of ________ and ________.

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

  32. ________ is sometimes called the bit rate.

    1. signal rate
    2. modulation rate
    3. Data rate
    4. pulse rate

  33. Time division multiplexing is used in ________ systems.

    1. Analog
    2. Hybrid
    3. Digital
    4. Automated

  34. The logical connection between the peer layers is ________ connection.

    1. Physical
    2. Direct
    3. Indirect
    4. Tangible

  35. If a digital signal has "L" number of levels. ________ is the number of bits required to represent each level.

    1. Log L
    2. Log Base 2 L
    3. L Square
    4. Log(2*L)

  36. In frequency shift keying, ________ remain(s) constant.

    1. Frequency
    2. Amplitude
    3. Both Amplitude and Phase
    4. Both Phase and Frequency

  37. In an analog hierarchy to carry voice channels, a group can carry ________ voice channels.

    1. 60
    2. 12
    3. 20
    4. 10

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

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

  39. 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

  40. 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

  41. 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

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

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

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

    1. true
    2. false

  44. 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

  45. Central Hub in a Tree is an ___________.

    1. Active hub
    2. passive hub

  46. ________ contains a repeater.

    1. Active hub
    2. Passive hub

  47. In ___________ a dedicated communication path is established between two stations through the nodes of the network

    1. Circuit switching
    2. Packet switching

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

    1. true
    2. false

  49. 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

  50. 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

  51. 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

  52. Which one is not the function of data link layer?

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

  53. Flow control is needed to prevent ________.

    1. Bit errors
    2. Overflow of the sender buffer
    3. Overflow of the receiver buffer
    4. Collision between sender and receiver

  54. Session layer is responsible for _________.

    1. Reassembly of data
    2. Maintaining the connection

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

    1. Transport Layer
    2. Session Layer

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

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

  57. 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

  58. Analog refers to something that is continuous in ___________.

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

  59. A sine wave is ___________.

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

  60. Digital signals are refered to be ___________.

    1. Continuous
    2. Discrete
    3. All of the given
    4. None of the given

  61. Human voice is example of ___________ signal.

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

  62. ________ is the rate of change with respect to time.

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

  63. Analog signals are refers to be ___________

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

  64. A sine wave is defined by ___________ characteristics.

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

  65. 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

  66. 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

  67. 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

  68. 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

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

    1. true
    2. false

  70. Time domain shows changes in ___________.

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

  71. 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

  72. 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

  73. ________ 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 the given

  74. 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

  75. 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 the given

  76. RZ stands for ___________.

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

  77. Digitizing an Analog Signal is called ___________.

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

  78. The level of signal is always positive in NRZ encoding.

    1. true
    2. false

  79. Radio is an example of _______ signal conversion.

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

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

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

  81. ________ encoding is almost obsolete today

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

  82. The inversion of the level at 1 bit is called as ________.

    1. NRZ-L
    2. NRZ-I
    3. RZ
    4. None of the given.

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

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

  84. 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

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

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

  86. Sampling means measuring ____________ of signal at equal intervals

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

  87. In analog transmission, the base signal is called the________.

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

  88. In ASK, Noise usually affects the ________.

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

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

    1. True
    2. False

  90. Which of the following is most affected by noise?

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

  91. Following characteristics fully describe ___________,
    Amplitude
    Period/Frequency
    Phase

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

  92. In ASK, both ______ and ________ remain constant.

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

  93. 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

  94. PSK is susceptible to the noise degradation.

    1. True
    2. False

  95. AM signal requires ___________ the BW of original signal

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

  96. 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

  97. Asynchronous transmission is ___________.

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

  98. There are _________ types of serial transmission.

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

  99. 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

  100. 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

  101. A ________ modem is used to connect two DTEs directly.

    1. 'NULL
    2. Cable
    3. DSL
    4. None of the given

Course Codes

Select a course code for Objective Questions:

ACC311 ACC501 BIF101 BIF401 BIF501 BIO101 BIO201 BIO202 BIO203 BIO204 BIO301 BIO302 BIO303 BIO401 BIO503 BNK603 BT101 BT201 BT301 BT302 BT401 BT402 BT403 BT404 BT405 BT406 BT501 BT504 BT505 BT604 CHE201 CHE301 CS001 CS101 CS201 CS202 CS204 CS301 CS302 CS304 CS311 CS401 CS402 CS403 CS408 CS501 CS502 CS504 CS506 CS508 CS601 CS602 CS604 CS605 CS607 CS609 CS610 CS614 CS707 CS710 ECO401 ECO402 ECO403 ECO404 EDU302 EDU401 EDU402 EDU501 EDU601 ENG101 ENG201 ENG301 ENG501 FIN611 FIN624 FIN625 ISL201 IT430 MCM101 MCM301 MGMT623 MGT101 MGT211 MGT301 MGT401 MGT402 MGT501 MGT502 MGT503 MGT510 MGT601 MGT603 MKT501 MKT610 MKT630 MTH101 MTH202 MTH302 MTH501 MTH601 MTH634 PAK301 PHY101 PHY301 PSY101 PSY403 PSY502 PSY512 SOC101 SOC301 SOC401 STA301 STA630 STA641 ZOO102 ZOO401 ZOO501 ZOO502 ZOO503 ZOO504 ZOO505 ZOO506 ZOO510 ZOO630

Select a course code for Subjective Questions:

ACC311 CS001 CS101 CS201 CS301 CS607 CS701 CS702 CS703 CS704 CS707 CS708 CS710 CS711 CS718 CS721 CS724 ECO401 ECO403 ENG101 ENG301 MGT703 MTH501 STA301

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