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Download 8th Class Computer Science Notes (Unit-1) for Federal Board (FBISE) Islamabad

Download 8th Class Computer Science Notes (Unit-1) for Federal Board (FBISE) Islamabad

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Download 8th Class Computer Science Notes (Unit-1) for Federal Board (FBISE) Islamabad


Differentiate between the following
Client and Server:
  • A client computer uses the resources provided by the server.
  • A server holds all the resources to be shared on the network.
LAN and MAN:
  • LAN is group of computer joined together in a limited geographical distance or area.
  • MAN is spread over a larger area e.g. in a city.
GPS and Bluetooth:
  • GPS is a satellite based navigation system.
  • Bluetooth is wireless and short range technology that connects devices in nearby distances.
Sender and Receiver:
  • A device that sends or transmits the data over network is called Sender.
  • A device that received the data over network is called Receiver.
MAN and WAN:
  • MAN is spread over a larger area e.g. in a city.
  • WAN spread over area larger than that of MAN i.e. across cities or continents. A WAN can have many LANs and MANs connected to it.

Define the following:
Network Interface Card:
A Network Interface Card (NIC) is a computer hardware component that connects a computer to a network.
Transmission Medium:
A transmission medium is a path used to send and receive data from the communication device. It may be wired or wireless.
Physical Transmission Medium:
The wired path over which transmission of data takes place is called physical transmission media. Its types are: -
i)      Twisted pair cable
ii)     Co-axial cable
iii)    Fiber optic cable
Coaxial Cable:
It is an insulated copper cable used to carry high frequency data signals such as voice, images, videos and text.
Shielded Twisted Pair Cable:
It is oldest and still in use transmission medium. It consists of pairs of insulated copper wires twisted together.

Define Network Components.
The devices which are required to make up a network are called network components. i.e. Network Interface Card, Modem, Router, Switches & Cables etc.

What are advantages of LAN?
  • Implementation is simple.
  • Remote access and sharing.
  • Low cost.
  • Reliability and security.
  • Fast communication and data transmission.
  • Addition of new computer to network is easy.
State some disadvantages of WAN?
  • Setting WAN is expensive and complicated.
  • Security is real threat.
  • Protection from virus and hackers add more expense.
  • Its maintenance is a full time job which require budget and man power.
What is Computer Network?
When two or more computers are connected together so that they can exchange information and share resources, is called a Computer Network.

Write a short note on Bluetooth Technology.
Bluetooth is wireless and short range technology that connects devices in nearby distances. It creates personal area network. It is most common in mobile phone users.

What are different types of Computer Network? Explain any two of them.
Local Area Network (LAN):
·        It provide networking to computers in close distance. i.e. in an office, in school or in home.
·        LAN provides link among client computers.
·        It gives access to share resources like printers, files and internet etc.
Metropolitan Area Network (MAN)
·        It provide networking to computers over a town or city.
·        It is larger than LAN but smaller than WAN.
·        It can be used to connect several LAN networks.
·        Universities or Bank having multiple campuses or branches can use MAN network.
Wide Area Network (WAN)
·        A WAN spreads over a large geographical area.
·        WAN helps users in sharing information about sales, production, marketing etc.
·        It enables employees of different organizations to work from any location across the world.

Write a detailed note on Dial up Modem.
·        A modem is a device, that allows the computer to send and receive data over telephone lines by using a computer.
·        It receives digital data, convert it into analog form, and then transmit it over telephone lines.
·        Modem can be internal or external.
Explain satellite communication in detail.
·        It is an artificial satellite stationed in space for telecommunication.
·        It is launched by rocket and placed in specific orbit.
·        There are hundreds of satellites in operation around the world.
·        Communication satellite receives radio signals from one base station and transmits to the destination base station situated thousands miles away.

What do you understand by GPS? Explain.
·        It is satellite based navigational system.
·        GPS is used for finding paths.
·        It helps pilots in aviation to monitor their path.
·        GPS work in any weather condition.
·        GPS satellite revolves around the earth in specific orbit.
·        We also use GPS in cars for navigation.

Explain the function of cellular communication.
·        It is based on mobile phones for sending and receiving.
·        Cellular communication uses a large number of low power wireless transmitters to create cells.
·        It offers services to thousands of mobile users.
·        It works on radio technology with two way communication.
·        Using cellular communication, users can make phone calls or exchange data with other phones.



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Download Class Notes: Download 8th Class Computer Science Notes (Unit-1) for Federal Board (FBISE) Islamabad
Download 8th Class Computer Science Notes (Unit-1) for Federal Board (FBISE) Islamabad
Download 8th Class Computer Science Notes (Unit-1) for Federal Board (FBISE) Islamabad
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