PHS CyberSchool

Computer Studies SG 

Last updated 12 Dec 2006

Theory examination November 2006 - 90 minutes - 75 marks - Answers

Question 1 - Multiple-choice questions - ˝ mark each - 10 marks

Select the answer to each question which you think is the correct or the best answer. Just write down the letter.

  1. C
  2. A
  3. C
  4. A
  5. C
  6. B
  7. C
  8. C
  9. B
  10. A
  11. C
  12. A
  13. D
  14. A
  15. A
  16. D
  17. C
  18. B
  19. D
  20. C

[10]

Question 2 - Computer architecture - 15 marks

Study the Annexure and answer the questions.

  1.  

    1. 40 GB (1)

    2. Write CD’s / CD-RW (1)

  2.  

    1. In a slot on the motherboard (1)

    2. Uses light instead of ball / Uses laser/infrared LIGHT instead of ball / Does not get dirty / (Do not accept laser/infrared connection) (1)

    3. PS/2 (1)

    4. Easy to plug in a peripheral / USB is hot swappable / 127 devices  (2)
    5. (16 MB AGP) video card, (15”) Monitor (2)

  3.  

    1. Able to connect to PC without rebooting (1) 

    2. Radio signals (1)

    3. Registers are used to hold the addresses of instructions and data in memory (1) that the CPU is currently working on (1) 

    4. Arithmetic Logic Unit and Control Unit. (2)

[15]

Question 3 - System software - 10 marks

Study the Annexure and answer the questions.

  1. Ms Office 2000 (1)
  2.  
    1. Quotation A (1)
    2. McAfee Antivirus (1)
  3.  
    1.  
      1. Shareware can be used free of charge for a trial period after which some form of payment is normally required. (1)
      2. Open Source:  Software that is freely available and where the source code of the program is available and anybody may edit/adjust it subject to the GPL.  (1)
    2. Basic Input and Output System (1)
    3.  
      1. Diagnostic Routines - tests all components 
      2. Initialiasing Routines- set up 
      3. BIOS functions - constructs interrupt sectors 
      4. Bootstrap Loader - obtains operating sytem from disk and loads into memory - needs 3 with explanations (3)
    4. Drivers allow the Operating system to access and control hardware not supported by the BIOS, acts as translator between device and program. (1) 

[10]

Question 4 - Data communication - 15 marks

  1.  
    1. looks like a circuit board/PC card - in notebook computers and on some motherboards the modem is in fact an integrated chip (1)
    2. Switch digital signals to analogue and analogue to digital signals in order to send and receive, Connects computers via a telephone line to the Internet (1)
    3. External modem can be switched off without switching off the computer.  Data communication is “visible” with lights flickering. It is easy to move it to another computer. Easier to instal/replace.  (1)
  2.  
    1. The layout of the network (1)
    2.  (4)
      1. bus
      2. ring
      3. star
      4. bus / star
  3.  
    1. Network interface card (not network card) (1) 
    2. share expensive hardware, save on capital expenses, centralisation of data, communications security (not cheaper) (2)
    3. Add new users, give rights, document network, install antivirus software  (2) 

    4. Fibre optic is faster, less interference, low attenuation,  reliable, longer distances, no EMI, no eavesdropping, no cross talk, thin and lightweight, (do not accept thinner)  (2)

[15]

Question 5 - Social implications and ethical issues - 10 marks

  1.  
    1. repetative jobs are being done by computers  (1)
    2. people have to maintain and service computers  (1)
  2.  
    1. https: (1)
    2. padlock (1)
    3. digital  (1)
    4. ATM cards, credit cards, debit card, internet banking, online shopping (2)
    5. fear, lack of computers, cost (1)
  3. Advantages - speed, reliability, simplicity: Disadvantages - needs a computer, can be misinterpreted, does not have personal touch (2)

[10]

Question 6 - Data communication and Social implications - 15 marks

  1. Edgars

    1. network
      • group of computers or computing devices (e.g. printers, faxes)
      • connected by some kind of communication media (1)
    2. expand
      • when a LAN uses modems, microwave, satellite, radio or fibre to
      • expand out of its campus or building, it may become big enough to cover a city.  (1)
    3. wire
      • When installing a WAN over long distances, companies like Edgars rent a service from Telkom
      •  who already has the communication infrastructure in place to allow communication around the country.(1)
    4. pay account
      • A mainframe is a large expensive and very powerful computer that can handle hundreds or thousands of connected users simultaneously, storing tremendous amount of data, instructions and information.
      • The mainframe(s) and the computers of all the Edgars branches are linked in one network. If the database on the mainframe(s) are being updated all the branches can retrieve the same information from the mainframe(s). (1)
    5. Pay account
      1. Most probably she uses Internet banking facilities to do a transfer from her bank account to the Edgars bank account. (1)
      2. Connection
        • A modem dial-up connection is not a permanent connection. You have to dial up using a phone line. The connection is only for the duration of the call. The maximum speed is 56 kbps.
        • ISDN connection is also a dial-up connection using regular copper telephone lines. The line however carries digital signals. The maximum speed is 64-128 kbps. 
        • ADSL is a permanent connection with an asymmetric digital subscriber line. No dialling up is necessary. With this line you can surf on the internet while at the same time talking on the phone or sending a fax. The maximum speed Upstream is 128-256 kbps and downstream 384-512 mkbps (3)
      3. Any connection and motivation. E.g. she is not a motivated surfer and will most properly need the Internet only for banking and email. The modem dial-up is good for home use and is cheap. (2)
      4. Connection
        • Internet browser is an application program that allows one to view and explore web pages on the internet e.g. Internet Explorer.
        • A modem converts an analog signal of a telephone line to a digital signal of the computer or vice versa. 
        • An ISP is a company that has a permanent, fast connection to the internet. They sell Internet access to individuals or organisations for a monthly fee e.g. MWEB  (3)
      5. VoIP
        • VoIP (Voice over Internet Protocol)
        • uses the internet, instead of the public switched telephone network, to connect a calling party and one or more calling parties.
        • Talking to her daughter in Germany using VoIP will be much cheaper than using the cellphone or switched line (2)

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