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PHS CyberSchool

Computer Studies SG Grade 12 - 2005

Last updated 29 May 2005

Theory examination May 2005 - 90 minutes - 100 marks

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

Select the best answer to each question.

  1. To have a mobile office you need a ... 
    1. landline and laptop 
    2. landline and PDA 
    3. laptop and cell phone 
    4. PDA 
  2. Two examples of ... are cable television lines and telephone lines. 
    1. communication channels 
    2. communication devices 
    3. receiving devices 
    4. sending devices 
  3. The term cybercrime refers to ... 
    1. any illegal activity involving a computer 
    2. destructive events or pranks 
    3. events that damage computer hardware 
    4. Internet-based illegal acts 
  4. An online meeting allows users to ... 
    1. determine the receiver's geographic location 
    2. leave voice messages for one or two people 
    3. print to a web address that is associated to a particular printer 
    4. share documents with others in real time 
  5. Software that collects information about a user without his consensus: 
    1. Phising 
    2. Sniffer program 
    3. Social engineering 
    4. Spyware 
  6. What communication channel transfers data as pulses of light? 
    1. Fiber-optic cable 
    2. Microwave 
    3. Satellite 
    4. Telephone line 
  7. A program that is used to translate that which is sent, such as a confidential document, into gibberish by applying a certain formula or algorithm: 
    1. Digital certificate 
    2. Digital signature 
    3. Encryption 
    4. SSL 
  8. Rules for exchanging data on a network: 
    1. Asynchronous transmission 
    2. Configuration 
    3. Protocol 
    4. Serial transmission 
  9. ... is a technique used by criminals to win the trust of an individual and then get them to provide them with personal information. 
    1. Phising 
    2. Social engineering 
    3. Using a sniffer program 
    4. Using spyware 
  10. The device used in a data communication network to perform the conversion between analogue and digital signals, is called a ... 
    1. front end processor 
    2. modem 
    3. decoder 
    4. multiplexer 
  11. A company publishes all their clients' details on their web site without the clients' permission. This is an example of ...
    1. identity theft 
    2. invasion of privacy 
    3. software piracy 
    4. violation of privacy 
  12. Which of the following configurations always uses a central server? 
    1. bus 
    2. ring 
    3. star 
    4. All of the above. 
  13. A technique used to prevent unauthorised use of sensitive information is ... 
    1. blocking 
    2. decryption 
    3. encryption 
    4. hashing 
  14. A dedicated channel or circuit is established connecting the sender and receiver by a single path for the duration of the call: 
    1. Cell switching 
    2. Line switching 
    3. Message switching 
    4. Packet switching 
  15. The most popular LAN architecture today is ... 
    1. ArcNet 
    2. CSMA/CD 
    3. Ethernet 
    4. Token passing 

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Question 2 - Short questions - 20 marks

  1. Write down the missing word in each of the following descriptions: (3) 
    1. ... is the authoring language used to create documents on the World Wide Web. 
    2. Each web page has a unique address, called the ... 
    3. A ... is a built-in connection to another web page or web site and is usually indicated as text underlined in blue, or with a graphic usually with a blue outline. 
  2. What is the correct term for the following descriptions? (3) 
    1. Provides users with a dedicated continuous connection between two points. 
    2. The unit used to measure the amount of data that can be transmitted in a second. 
    3. Total data handling capacity of a communication medium. 
  3. Are the following statements from the South African Electronic Communications and Transactions Act (No 25 of 2002) True or False? (4) 
    1. A person who gained unauthorized access to a computer can be prosecuted even though no damage was done. 
    2. It is not illegal to spread viruses. 
    3. The consumer is protected by a 10-day cooling off period where he/she can cancel a purchase made via the Internet.
    4. ISPs must be able to intercept an email if the state deems it necessary. 
  4. Choose the correct term: Microwave, radio, satellite  (4) 
    1. ... can be used to communicate for a company with offices across the road. 
    2. ... is used to establish communication links to remote locations or over long distances. 
    3. ... systems look like the DSTV antennas that you see on many houses around the country. 
    4. Cellular, Wi-Fi and Bluetooth are all examples of ... communications. 
  5. Choose the correct method of connecting to the Internet: ASDL, DIGINET, ISDN, Modem  (4) 
    1. A company wants their 150 employees to have permanent Internet connectivity. 
    2. A family runs a small business from home and would be using their Internet for banking, email and e-commerce. They need a permanent connection for the one computer that they use for their business. 
    3. A family wants to connect to the Internet for email and a small amount of surfing. 
    4. A small company will be using the Internet for less than 2.5 hours a day, mainly to be able to email their clients and to do banking. It is however, important for them to have a fast Internet connection. 

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Question 3 - Social implications of computers - 20 marks

  1. Name two ways in which the Internet can be overloaded thus causing delayed access to web pages. (2)
  2. Copying
    1. Give two reasons used by some people to justify the copying of CDs and DVDs. (2)
    2. Give two reasons why it should not be allowed. (2)
  3. A person wins a Truworths gift voucher for, she is told valued at R500. The gift voucher is a hard plastic card with advertising but no mention of the amount of money on it!  What is it and how can it be a gift voucher? Explain. (2)
  4. Doing business via the Internet has been made less risky by the use of digital certificates. 
    1. Name two firms which supply digital certificates. (2)
    2. Name two things that a digital certificate verifies or does. (2)
    3. Name two things that must be found on a digital certificate. (2)
  5. Describe the measures banks and their clients take to prevent unlawful access to Internet bank accounts. (3)
  6. Name three devices which will allow you to carry large amounts of information around with you. (3)

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Question 4 - Data communication and networks - 45 marks    

  1. What piece of hardware is found on a computer in a LAN but not in a stand-alone computer? (1) 
  2. Consider the following statement: "Companies should back up their data at least once a month." Is this true or false? Discuss and motivate your answer. (1) 
  3. How and where is a modem attached to a computer? Indicate the type of modem when you discuss the answer. (1) 
  4. When would a satellite be used to transmit information instead of microwave? (1) 
  5. What is the difference between an active hub and a switch? (1) 
  6. Name two practical uses of satellite communication. (2) 
  7. Distinguish between SMS, MMS and EMS. (3) 
  8. Describe the features of a good password. (3) 
  9. Fully explain three disadvantages of using fibre optic cabling. (3) 
  10. Fully explain three advantages of using a star topology. (3) 
  11. Explain in detail three factors that influence the speed of access to the Internet. (3) 
  12. A business person has a laptop with WiFi connectivity. 
    1. What does it mean for a laptop to have WiFi connectivity?  Explain. (1) 
    2. Where would you be able to connect to the Internet using WiFi connectivity?  (1) 
  13. A UPS is used when one wants to protect data. 
    1. Where is a UPS installed?  (1) 
    2. Describe the way in which a UPS protects data. (3) 
    3. Name and shortly describe three other ways in order to protect data against an accident. (This is technical.) (3) 
    4. Name and shortly describe three ways in which to secure data. (This is more social.) (3) 
  14. The TCP/IP protocol suite consists of the following protocols. Write down the meaning of each of the following abbreviations and indicate when, where and/or how they are used. (3) 
    1. FTP 
    2. SMTP 
    3. TCP/IP 
  15. The network in a computer centre in a poorly resourced school is set up so that it is possible to log on to the Internet.
    1. Describe one advantage of the Internet for such a school. (1) 
    2. Describe one non-technical problem a school must consider when using the Internet. (1) 
    3. Describe one technical problem a school must consider when using the Internet. (1) 
  16. Consider the following networks: 
    1. Network A - A set of dumb terminals connected to a file server. 
    2. Network B - A set of microcomputers each with 8 MB RAM and colour VDU but without hard disks, connected to a file server forming a client-server network. 
    3. Network C - A set of microcomputers each with 8 MB RAM, colour VDU and small hard disks connected together to form a peer-to-peer network. 

Using the networks described, state with reasons, which network is best suited to each of the following applications: 

  1. A computer system for a school where learners are developing their own programs. (1) 
  2. A computer system at a company for recording sales. (1) 
  3. An information retrieval system at a library, where users look up the catalogues of books on the computer system. (1) 
  4. A computer system in a large company using a text-based word processor. (1) 

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This work may be freely copied for non-commercial use only. Copyright © Pam Miller.