Computer Science (New) - For Class IX - UNIT. 4 - Data Communication and Computer Networks - MCQs, Fill In The Blanks And Abbreviations

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Chapter No.4 - Data Communication and Computer Networks
MCQs And Fill In The Blanks

Multiple Choice Questions (MCQs)

A. Choose the right answer:
1. Wired Media is also called:
a) targeted media
b) directed media
c) guided media ✓
d) unguided media

2. Communication system is made up of
a) three components
b) four components
c) five components ✓
d) six components

3. Both Physical and Logical addresses are:
a) different
b) unique ✓
c) permanent
d) temporary

4. If you are an electrical or electronic engineer, you should join:
a) IEEE ✓
b) IETF
c) ITU
d) ANSI

5. The topology in which all computers are connected to a central device called hub is:
a) Bus
b) Star ✓
c) Ring
d) Tree

6. Change in the shape of signal between sender and receiver is called:
a) attenuation
b) interruption
c) noise
d) distortion ✓

7. Router determines data path to transfer data packets which is the:
a) shortest
b) longest
c) cheapest
d) optimal ✓

8. Converting digital signal to analog is called:
a) modulation ✓
b) modification
c) bandwidth
d) multiplexing

9. The number of bits used in an IPV 4 address are:
a) 16
b) 32 ✓
c) 64
d) 128

10. The loss of energy in transmission signal refers to.
a) Attenuation ✓
b) Distortion
c) Noise
d) Jitter

11. A conversation between two people is an example of _____.
a) data communication
b) communication ✓
c) electronic communication
d) data Transmission

12. Electronic communications, like emails and instant messages and phone calls are examples of ______.
a) data communications ✓
b) communication
c) data Transmission
d) Message

13. Collection of raw facts and figures is called _______.
a) information
b) communication
c) message
d) data ✓

14. The text, numbers, symbols, images, voice and video which are processed by computers and digital devices are called ______.
a) data ✓
b) bit
c) information
d) communication

15. _______ is the process of exchange of data and information between human and computing device.
a) data communications ✓
b) Digital Signals
c) data Transmission
d) Analog Signals

16. The _______ means emission of data in any direction via wireless or wired medium.
a) data communications
b) data Transmission ✓
c) data Rate
d) topology

17. The human voice is example of a / an _______ .
a) data signal
b) digital signal
c) analog signal ✓
d) electric signal

18. Signals used by computer are the ______.
a) data signals
b) digital signals ✓
c) analog signals
d) electric signals

19. Bit is the actual binary digit which is the basic unit of data _______.
a) transmission ✓
b) data rate
c) baud rate
d) Protocol

20. Which is the smaller value.
a) bps ✓
b) mbps
c) kbps
d) gbps

21. A communication system has _______ component.
a) three
b) four
c) five ✓
d) six

22. Twisted-pair cable, coaxial cable, radio waves, etc. are example of _______.
a) Sender
b) Receiver
c) Medium ✓
d) Protocol

23. A _______ is an agreement between two parties or venders, using communication devices.
a) protocol ✓
b) Medium
c) Transmission Medium
d) Communication

24. _______ is broadly classified into two groups guided and unguided.
a) Transmission Impairments
b) Transmission media ✓
c) Computer Network
d) Data communications

25. ______ Cable is made by putting two separate wires together in a twisted pattern.
a) fiber optic
b) Shielded Twisted Pair
c) Coaxial
d) Twisted Pair ✓

26. _________ is a type of cable consists of a special jacket to block external interference.
a) fiber optic
b) Shielded Twisted Pair (STP) ✓
c) Coaxial
d) Twisted Pair

27. ________ cable has an outer plastic covering containing two parallel conductors each having a separate insulated protection cover.
a) fiber optic
b) Shielded Twisted Pair (STP)
c) Coaxial ✓
d) Twisted Pair

28. In ______ cable data is transferred in the form of light.
a) fiber optic ✓
b) Shielded Twisted Pair (STP)
c) Coaxial
d) Twisted Pair

29. There are ____ common types of guided media used for the networks.
a) 2
b) 3 ✓
c) 4
d) 5

30. There are ____ types of twisted pair cables.
a) 2 ✓
b) 3
c) 4
d) 5

31. It is mostly used for telephonic applications.
a) Unshielded Twisted Pair (UTP) ✓
b) Shielded Twisted Pair (STP)
c) Coaxial
d) Twisted Pair

32. It is used in fast-data-rate ethernet and also in voice and data channels of telephone lines.
a) Unshielded Twisted Pair (UTP)
b) Shielded Twisted Pair (STP) ✓
c) Coaxial
d) Twisted Pair

33. Cable TVs and analog television networks widely use _____ cables.
a) Unshielded Twisted Pair (UTP)
b) Shielded Twisted Pair (STP)
c) Coaxial ✓
d) Twisted Pair

34. There are _______ major types of Unguided Media.
a) 2
b) 3 ✓
c) 4
d) 5

35. It is a device that connects two or more networks.
a) Switch
b) Modem
c) Router ✓
d) Microwaves

36. Continuously varying signals or waves that change with time period are called:
(a) data signals
(b) digital signals
(c) analog signals ✓
(d) electric signals

37. An electrical signal that is converted into a pattern of bits to represent a sequence of discrete values, at any given time is called:
(a) data signal
(b) digital signal ✓
(c) analog signal
(d) electric signal

38. It is the rate at which data is transferred and normally measured in bits per second.
(a) Data rate ✓
(b) Transfer rate
(c) Baud rate
(d) Transmission rate

39. It is the number of signals transmitted per second.
(a) Data rate
(b) Transfer rate
(c) Baud rate ✓
(d) Transmission rate

40. Signal-to-noise ratio is often expressed in:
(a) hertz
(b) bits / second
(c) baud / second
(d) decibels ✓

41. It is the channel or path through which the message is carried from sender to the receiver.
(a) Sender
(b) Receiver
(c) Medium ✓
(d) Protocol

42. The rules and procedures on which computers exchange data on network are called:
(a) Baud rate
(b) Data rate
(c) Medium
(d) Protocol ✓

43. It is a wireless or physical path between the sender and receiver through which data is sent and received from one place to another.
(a) Transmission
(b) Communication Channel
(c) Both `a" and 'b' ✓
(d) None of them

44. In this signals are transmitted in a narrow pathway by using physical links.
(a) Guided media ✓
(b) Unguided media
(c) Transmission Channel
(d) Media Channel

45. It is also called Wired or Bounded transmission media.
(a) Guided media ✓
(b) Unguided media
(c) Transmission Channel
(d) Media Channel

46. In optical fiber or fiber-optic cable data is transferred in the form of:
(a) electric signals
(b) light ✓
(c) sound
(d) analog signals

47. Radio-waves, microwaves and infrared are examples of:
(a) Guided media
(b) Unguided media ✓
(c) Transmission Channel
(d) Media Channel

48. For transmission, FM, AM radios, television and cordless phones use:
(a) microwaves
(b) infrared
(c) ultrasound
(d) radio waves ✓

49. Sometimes, signals traveling through transmission media lose their quality. This phenomenon is called:
(a) transmission errors
(b) transmission faults
(c) transmission impairments ✓
(d) transmission loss

50. Loss of signal energy is called:
(a) attenuation ✓
(b) distortion
(c) noise
(d) fault

51. It means change in the shape of the signal.
(a) attenuation
(b) distortion ✓
(c) noise
(d) fault

52. Unwanted signal that mixes up with the original signal during the transmission of data is called:
(a) attenuation
(b) distortion
(c) noise ✓
(d) None of these

53. It is a networking device that connects computers and other devices.
(a) Switch ✓
(b) Router
(c) Modem
(d) DSL Modem

54. It has the ability of sending and receiving signals that allows computers to share information with each other.
(a) Switch ✓
(b) Router
(c) Modem
(d) Interface card

55. It is a group of computer and peripheral devices which are connected in a limited area such as school, laboratory, home and office building.
(a) Internet
(b) WAN
(c) MAN
(d) LAN ✓

56. This computer network can spread across an entire city, college campus, or a small region.
(a) Internet
b) WAN
(c) MAN ✓
(d) LAN

57. It is used for long distance transmission of data and covers a larger geographical area like cities, provinces or even countries.
(a) Internet
(b) WAN ✓
(c) MAN
(d) LAN

58. The physical layout in which computers are connected is called:
(a) topology ✓
(b) internet
(c) network
(d) LAN

59. If computers and other devices are connected with a single cable, it is called:
(a) star topology
(b) ring topology
(c) bus topology ✓
(d) delta topology

60. This organization is responsible for endorsing and coordinating the functions of the other standards organizations.
(a) ISO ✓
(b) IEEE
(c) ITU
(d) ANSI

61. This organization is concerned with the development of internet architecture and smooth operation of the internet.
(a) IETF ✓
(b) IEEE
(c) ITU
(d) ANSI

62. This model divides a communication system into seven abstraction layers.
(a) ITU's model
(b) TCP Model
(c) IP Model
(d) ISO's OSI Model ✓

63. It is 48 bit MAC, permanent address.
(a) TCP address
(b) physical address ✓
(c) logical address
(d) IPV4

64. It is a 32 bit IP address. It is temporary.
(a) TCP address
(b) physical address
(c) logical addiess ✓
(d) IPV4

Fill In The blanks

1. Communication is the process of sharing a message.
2. Data communications refers to the sharing of a virtual message.

3. Data communication refers to the exchange of digital messages between two devices.
4. The word data is derived from Latin language and it is plural of Datum.
5. Data can be considered as unprocessed information.
6.Data rate refers to the rate at which data is transferred.
7. Data rate is normally measured in bits per second transferred.
8. Data rate is also called bit rate
9. The baud rate is the number of signals transmitted per second and one signal can represent one or more bits.
10. Signal to Noise Ratio is defined as the ratio of signal power to the noise power.
11. The effectiveness of a data communications system depends on the fundamental characteristics which include delivery, accuracy and timeliness.

12. In fiber-optic cable, the core is surrounded by a less dense glass or plastic covering called the cladding.
13. Radio waves are also called electromagnetic waves.
14. Radios, television and cordless phones use radio waves for transmission.
15. Radio waves are omnidirectional and propagated in all directions.
16. Microwave transmission is a line of sight transmission i.e. the sending and receiving antennas need to be properly aligned with each other.
17. Terrestrial and Satellite are two types of microwave transmissions.
18. Satellite works at remote places so it can be used in mobile devices.
19. Infrared light is transmitted generally line of sight (point to point).
20. Wireless infrared communications can be used to establish short range wireless links or wireless Local Area Network.
21. Transmission impairments are those defects that occur when data is transmitted.

22. There are three kinds of transmission impairment as attenuation, distortion and noise.
23. Attenuation means loss of energy or a weakened signal.
24. Influence signal that mixes up with the original signal during the transmission of data is called noise.
25. A switch or network switch is a networking device that connects computers and other devices like printers, scanners, and cameras of a computer network.
26. Modem is short for Modulator and Demodulator.
27. Modulation is the process of converting digital signals into analog signals.
28. Demodulation converts analog signals into digital signals.

29. Dialup modems use standard telephone lines to transmit and receive information.
30. Integrated Services Digital Network (ISDN) is a digital phone connection that can transmit data, voice and video over a normal telephone line at the same time.
31. Network cards also known as Network Interface Cards (NICs).
32. NICs are hardware devices that connect a computer with the network.
33. A computer network is a system of computers and related equipment connected by a communication links to share data and other resources.
34. Computer networks can be categorized by their size as well as their purpose.
35. There are three types of computer networks Local Area Network (LAN), Metropolitan Area Network (MAN) and Wide Area Network (WAN).
36. A Local Area Network (LAN) is a group of computer and peripheral devices which are connected in a limited area.
37. LAN are use in school, laboratory, home, and office building.
38. A Metropolitan Area Network or MAN consists of a computer network across an entire city, college campus, or a small region.
39. A Wide Area Network is used for long distance transmission of data.
40. WAN helps to cover a larger geographical area.
41. WAN may connect two or more countries.
42. Bus topology consists of a single cable by which all the computers and other devices of a network are connected.
43. In ring topology, computers are connected in a ring shape.
44. In a star topology, all the computers are connected to a central device called hub or switch.
45. Network standards define rules of communications among computing devices.
46. International Organization for Standardization (ISO) consists of members from the standards committees of various governments across the world.
47. IEEE, IETF, ITU and ANSI are examples of standard organizations with different goals and functions.
48. Network architecture is the design of a computer network.
49. The OSI is a conceptual model that characterizes and standardizes the communication functions of telecommunication and computing.
50. A network address is any logical or physical address that uniquely identifies itself from other addresses.
51. Physical address is a 48 bit MAC, permanent address.
52. Logical address is a 32 bit IP Address. It is temporary.
53. An IPV4 address is made up of 32 binary bits, which is divided into two parts, network and host.

Abbreviation

ANSI: American National Standards Institute
ASCII: American Standard Code for Information Interchange
bps: Bits per second
Cisco: Commercial and Industrial Security Corporation
DSL: Digital Subscriber Line
FTP: File Transfer Protocol
HTTP: Hypertext Transfer Protocol
IBM: International Business Machines
IEEE: Institute of Electrical and Electronic Engineering
IETF: International Engineering Task Force
IP: Internet Protocol
IPV4: Internet Protocol version 4
IR: Infrared
ISDN: Integrated Services Digital Network
ISO: International Organization for Standardization
ITU: International Telecommunication Union
kbps: kilo bits per second
LAN: Local Area Network
LED: Light-Emitting Diode
MAC: Macintosh
MAN: Metropolitan Area Network
mbps: megabits per second
NIC: Network Interface Card
OSI: Open Systems Interconnection
SNR or S/N: Signal-to-noise ratio
STP: Shielded Twisted Pair
TCP: Transmission Control Protocol
UDP: User Datagram Protocol
UTP: Unshielded Twisted Pair
WAN: Wide Area Network

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