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CBSE-IX-Foundation of Information Technology .

04: Communication Technology

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    Foundation of Information Technology - Communication Technology
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    Section : A
    Very Short Answer Type Questions
  • Qstn #1
    Name the term defined by given below statement:
    “A group of computers connected to each other by a link.”
    Ans : Computer network is defined as a group of computers connected to each other by a link.
  • Qstn #2
    Two people, one knowing only English and other knowing only Chinese are talking to each other. Can we call it a communication?
    Ans : No, because only a meaningful exchange of information between two living beings is called communication.
  • Qstn #3
    Give few examples of communication technology.
    Ans : Telephones, mobiles, fax, Internet etc., are some examples of communication technology.
  • Qstn #4
    Write down the components of a computer network established between the two offices of a company across the cities.
    Ans : The five components will be involved in this computer network, since telephone lines will be used as communication channel.

    • Sender
    • Data communication device at sender’s end
    • Communication channel
    • Data communication device at receiver’s end
    • Receiver
  • Qstn #5
    What is the importance of communication channel?
    Ans : Communication channel is responsible for carrying data in the form of signals from sender to receiver.
  • Qstn #6
    List down the types of computer networks.
    Ans : Following are the three main types of computer networks, based upon the geographical area as follows:

    • Local Area Network (LAN)
    • Metropolitan Area Network (MAN)
    • Wide Area Network (WAN)
  • Qstn #7
    Which cable networks are used for LAN connections?
    Ans : Twisted pair and fibre optic cables are used for LAN connection.
  • Qstn #8
    Why Internet is called a network of networks?
    Ans : Internet is called a network of networks because it connects several large and all heterogeneous networks together into a bigger network.
  • Qstn #9
    Give one basic difference between guided and unguided transmission channels.
    Ans : In guided transmission media, cables (or wires) are used for communicating data while in unguided transmission, in place of cables, signals travel through air.
  • Qstn #10
    Why wires in twisted pair cable are twisted around each other?
    Ans : Wires are twisted to provide protection against crosstalk and noise.
  • Qstn #11
    When we transmit signal over a long distance, the intensity of the signal is reduced. What could be the solution for this problem?
    Ans : We can use a networking device called repeater, regenerates the feeble signal and transmit it.
  • Qstn #12
    Write down the name of communication channel used for telephone line and TV
    Ans : Communication channel for telephone line is twisted pair cable and for TV is co-axial cable.
  • Qstn #13
    Which guided media provide secure transmission amongst all of them?
    Ans : Optical fibre provides secure transmission as compared to twisted pair and co-axial cable. As, it is more immune to tapping than copper cables.
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