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Computer Studies SG Grade 12 - 2005

Last updated 01 Sep 2005

Theory examination September 2005 - 90 minutes - 100 marks - Answers

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

  1. C
  2. D
  3. C
  4. C
  5. A
  6. D
  7. A
  8. C
  9. D
  10. B

[10]

Question 2 - Matching columns - 1 each - 10 marks

  1. S
  2. B
  3. J or V
  4. T
  5. M
  6. H
  7. L
  8. P
  9. E
  10. O

[10]

Question 3 - Hardware, computer architecture and software - 35 marks

  1.  
    1. Save on purchasing film, film developing, and extra copies of photos, Can immediately view the photo, Can edit the photos yourself and add special effects to the photos, Image can be saved on your computer, Can add the photos to a word processing file, e-mail or web page  (1)
    2. picture element (1)
    3. The greater the number of pixels, the better the quality of the camera (1)
    4. Stiffy disk, PC card, memory stick, mini-CD (1) [4]
  2. A video camera whose output displays on a web page. The attraction is in the fact that the images change regularly.  [2]
  3. Trackball, Touchpad, Pointing stick, Joystick, Touch screen, Stylus   [2]
  4.  
    1. High quality print, Fast printing, Low running costs (2)
    2. The message probably mean that the printer's driver is not installed yet. A printer has its own specialized set of commands and thus requires a printer driver to communicate and accept commands from the operating system and application software. (1)
    3. Draft printing normally of a slightly lesser quality than best or normal printing and therefore use less ink; Under properties in the print dialog box, you can select draft printing (2) [5]
  5.  
    1. Storage capacity, Access time (2)
    2.  
      1. The CPU Interprets and carries out the basic instructions that operates a computer; Manages most of the computer's operations; Most of the devices connected to the computer communicates with the CPU; The Control Unit and the Arithmetic / logic unit perform the processing operations  (1)
      2. Control Unit, Arithmetic / Logic Unit, System Clock (2)
    3.  
      1. RAM stores the operating system and other system software while the computer is running; As additional programs and data are requested they also load from storage into memory. (1)
      2. 128+ (1)
      3. The memory in a video card stores information about each pixel on the monitor. (1)
      4. When your computer is slow, When new software requires more RAM(1)
      5. Use software that requires better quality graphics, Make displaying of picture on the monitor faster  (1)
    4. Make the computer operate faster by installing more RAM, Need more storage capacity on hard disk, Make it faster by installing a new CPU (2)  [12]
  6.  
    1. A backup is a duplicate of a file, or disk that can be used if the original is lost, damaged or destroyed.   (1)
    2. You will simply have to use too many stiffies. (1)
    3. Make a copy on a CD using a CD-writer. Use Nero (2) [4]
  7.  
    1. Defragmenting the disk reorganizes it so the files are stored in contiguous sectors.  (1)
    2. So the operating system can access data more quickly and programs can run faster. (1) [2]
  8. A boot disk is a disk which contains containing operating system commands that will contain enough of the system files and parameters to be able to boot the computer from the stiffy drive. It is used when one is if unable to boot from the hard disk as operating system may have been corrupted and/or have had files deleted which are required for booting. [2]
  9. Delete temp files, Uninstall unnecessary application software, Zip large files, Backup files that you seldom use onto a CD  [2]

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Question 4 - Networking and data communications - 22 marks

  1. A communications device that enables computers to communicate via telephone lines. A computer's digital signals must be converted to analogue signals. [2]
  2.  
    1. Twisted-pair cable, coaxial cable, fiber-optic cable (1)
    2. Broadcast radio, cellular radio, microwave radio, communications satellite, infrared  (1) [2]
  3.  
    1. Use numbers and letters, at least 5 letters long, change regular basis, keep secret, use a mixture of caps and small letters.  (2)
    2. Access to particular files only.  Level depends on position.  (2) [4]
  4.  
    1. Share expensive hardware like laser printers. Share information and data. Share software and programs by loading one copy on a server for all users. Communication across a network with other users. (2)
    2. Configuration or physical arrangement of the devices in a network. (2)
    3. Star network, bus network, ring network, mesh network (3)
    4. So many. (2)
    5. Restricting physical access. Passwords/logon-names. Set access rights per group/user. Set file/folder rights. Logout accounts after a significant number of attempts to enter a password. Force passwords to be reset on a regular basis. Restricting hours. Use a firewall (3) [12]
  5. An Intranet is an internal network using Internet and Web technologies within an organisation and for their exclusive use.  An Extranet is an Intranet that extends its use to (authorised) users outside of the organisation or company.  [2]

[22]

Question 5 - Social implications and careers - 23 marks

  1.  
    1. A smart card is a storage medium, about the size as a credit card, that stores data on a thin microprocessor embedded in the card. When inserted into a specialised card reader the information can be updated. A normal ATM or credit card does not contain a microprocessor and therefore the information can only be stored and not updated. (2)
    2. Hotels issues smart cards instead of keys. Store prepaid amounts for a prepaid telephone calling card. Storing patient records and health care information. Prepaid amounts for electronic money. (2) [4]
  2.  
    1. Strange characters appearing or moving on the screen. System frequently freezing without any reason. Data disappears without any reason. Data gets corrupted. No more space on hard drive or in memory. Computer becomes very slow, especially when booting. Some virus code will display a message letting you know that the virus has done its damage. CMOS altered. (2)
    2.  A worm is a malicious program that copies itself repeatedly in memory or on a disk drive until no memory or disk space remains. When no memory or disk space remains, the computer stops working. (2)
    3. A virus hoax is an e-mail message that warns you of a non-existent virus. (2)
    4. Russia (1) [7]
  3. An IP address is a number that uniquely identifies each computer or device connected to the Internet. It is an all-numeric address. A domain name is the text version of an IP address. [2]
  4.  
    1. Downloading is the process of receiving information onto your computer from a server on the Internet. (2)
    2. Get a faster modem Download zip files Turn off the graphics and display only text. (2) [4]
  5. A cookie is a small file that a web server stores on your computer. The next time you visit the web site, your browser retrieves the cookie from your hard disk and sends the data to the web site Cookies files typically contain data about you, such as your user name or viewing preferences. Cookies are used to identify users. [2]
  6. Restrict access to certain material by using a rating system. If content at the web site goes beyond the rating limits set in the web browser, a user cannot access the web site. Use web filtering software that can restrict access to specific web sites. [2]
  7. Digital divide is a phrase used to describe the idea that people of the world can be divided into two distinct groups: those that have access to technology and with the ability to use it and those who do not have access to technology or are without the ability to use it. The less fortunate people are therefore not able to take advantage of the technology that makes the rest of society prosper and grow. [2]

[23]

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