PHS CyberSchool

Computer Studies SG Grade 12 - 2005

Last updated 29 May 2005

Theory examination May 2005 - 90 minutes - 98 marks - Answers

Question 1 - Multiple-choice questions - 1 mark each - 15 marks

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

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Question 2 - Short questions - 18 marks

1.  (3) 
   1. html.
   2. URL 
   3. hyperlink 
2.  (3) 
   1. circuit -line switching. 
   2. bps 
   3. bandwidth 
3. (4) 
   1. T 
   2. F 
   3. T
   4. T 
4. (4) 
   1. Microwave
   2. satellite
   3. Microwave
   4. radio
5. (4) 
   1. DIGINET
   2. ASDL
   3. Modem
   4. ISDN

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Question 3 - Social implications of computers - 20 marks

1. virus, warning about a virus (2)
2.  
   1. Artists make enough money through their sales any way; As a crime copying of CDs and DVDs is not nearly as bad as committing murder; If copying is that simple no-one would be able to keep you from doing it anyway. (2)
   2. It is against the law; Artists lose their royalties if their products are copied and distributed (2)
3. microchip with the value, an electronic purse (2)
4.  
   1. Versign, Digital Signature Trust (2)
   2. Check textbook ......... (2)
   3. serial number, expiry date, ......... (2)
5. pin number, password, SMS. (3)
6. memory sticks, mp3-players, handheld hard disk drives, laptop computers, digital cameras, cell phones and PDA’s (3)

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Question 4 - Data communication and networks - 45 marks    

1. network interface card (1) 
2. F - should be done daily (1) 
3. external - via ..........., internal - via ................... (1) 
4. where there is no line of sight connection (1) 
5. check textbook .................. (1) 
6. Communication with other countries via a telecommunications provider such as Telkom; Used by military for mobile high speed communications  (2) 
7. SMS - Short Messaging Services – being able to send short text messages via your cell phone.; - MMS – Multimedia Messaging Services – ability to add pictures to messages.; - EMS – Enhanced Messaging Services – allows sound, pictures and video to be linked to a message. (3) 
8. upper case, lower case, numbers (3) 
9. complex to install, requires high precision manafacturing, cannot be joined to other cable or devics, expensive  (3) 
10. easy to add another work station, easy to trouble shoot, a switch is able to detect a network fault. (3) 
11. traffic, connection capacity, ISP  (3) 
12.  
    1. WiFi provides wireless connectivity to an ISP or normal network. (1) 
    2. Wherever a connection is possible such as in coffee shops, hotels and airports. (1) 
13.  
    1. Normally on a file server – between the file server and the plug. (1) 
    2. It protects the file server from power failures as it gives enough time so the computer can be shut down correctly (3)
    3. Regular backups, RAID, virus protection. (3) 
    4. passwords, firewall, lockup access (3) 
14.  (3) 
    1. File Transmission Protocol - upload files to the Internet
    2. Simple Mail Transfer Protocol - transfer mail 
    3. Transmission Control Protocol/Internet Protocol - transfer files on a ntwork
15. 1. reasons (1) 
    2. reasons  (1) 
    3. reasons (1) 

1. B, C with reasons. (1) 
2. B  with reasons (1) 
3. B with reasons. (1) 
4. A with reasons  (1) 

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