PHS CyberSchool

Computer Studies SG Grade 12 - 2006

Last updated 12 Dec 2006

Theory examination September 2006 - 90 minutes - 75 marks

Question 1 - Multiple-choice questions - ½ mark each - 10 marks

1.  b
2. d
3. d
4. a
5. a
6. a
7. b
8. c
9. a
10. a
11. b check
12. a
13. b
14. c
15. b
16. a
17. d
18. b
19. c
20. b

[10]

Question 2 - System software and operating system - 1 each - 10 marks

1. G
2. D
3. A
4. E
5. J
6. F
7. C
8. I
9. H
10. B

[10]

Question 3 - Computer architecture - 10 marks

1. Hot plugging - Devices can be plugged in and out without switching off or rebooting PC    (1)
2. Pipeline processing
   • Method of processing
   • Provides two or more processing paths. (2)

3. Three components of the CPU

   • Control unit – NB and in charge of the entire process – repeats machine cycle, is responsible for fetching and decoding instructions from memory and then carrying out the instructions.
   • Arithmetic logic unit – responsible for all the mathematical and logical aspects.
   • Registers – storage area within the CPU – used to hold the addresses of instructions and data in memory  (3)
4. Virtual memory
   • Used when computer run out of memory
   • Type of means utilised to free hard drive space to allow the operating system to fool the computer and the user into thinking that there is more RAM available.
   • O/S divides a large program into parts. Stores these parts on a secondary storage device, usually the hard drive. 
   • File created is called a SWAP FILE . (4)

[10]

Question 4 - Data communication and Social implications- 45 marks

1. Edgars

   1. network
      • group of computers or computing devices (e.g. printers, faxes)
      • connected by some kind of communication media (2)
   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.  (2)
   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.(2)
   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). (2)
   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. services
         • Checking balances
         • Transfers
         • Ordering of check books  (3)
      6. 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 (3)
      7. Benefits
         • She can do internet shopping or bye her favourite novels over the internet
         • Do some online bookings for shows, flights, movies. Send and receive email, She can chat or participate in a discussion groups
         • Do download of her famous videos, music, pictures or games.  (3)
2.  Advanced cellphone
   1. Position
      • GPS has an earth based receiver that analyze signals
      • sent by at least 3 satellites in order to determine its geographic location. (2)
   2. Border
      1. email
         • GPRS
         • You pay for the packets of data you send and receive (2)
      2. MTN (1)
      3. Web mail
         • Web mail is the ability to access an email through a web browser at any location that has internet access
         •  e.g. hotmail, yahoomail, webmail and Google (gmail) (2)
   3. snake
      1. amount of data that can be moved via a communication path in a fixed period.  (1)
      2. kbps
      3. Kilo bits per second  (1)
   4. look the exchange rate up on the internet.(1)
   5. photos
      • Bluetooth
      • radio communication. (2)
   6. online games
      1. It means it has a wireless adapter that can give connectivity to a normal network/ISP. (1)
      2. Area with the capability of wireless internet connection due to a wireless access point (1)
      3. Use the cellphone as a modem (1)
3. Responsibilities
   1. license agreements
      1. Responsibility gov
         • It introduces a number of risks into the software market.
         • It increases the chance of spreading viruses
         •  Drives up the price of software for all users.  (2)
      2. Responsibilies individual
   • install the software on a network, such as a school computer lab.
   • Give copies to a friend or colleague, while continuing to use the software
   • Export the software
   • Rent or lease the software . (2)
   2. Responsibility self
      1. RSI -repetitive strain injury
      2. Tendonitis or CTS-Carpal tunnel syndrome (inflammation of the nerve)
      3. CVS – Computer vision syndrome
      4. Obesity – heart and other organs suffersInternet addiction has an influence on your social life (10

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