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Computer Studies SG 

Last updated 15 Nov 2005

Theory examination November 2004 - 90 minutes - 73 marks - Answers

Question 1 - Multiple-choice questions - 1 mark each - 20 marks

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

[20]

Question 2 - Computer architecture - 15 marks

  1. A
  2. F
  3. E
  4. G/H
  5. H/G
  6. B
  7. Registers are used to hold the addresses of instructions and data in memory (1) that the CPU is currently working on (1) 

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

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

  10. Radio signals (1)

  11.  

    1. LPT = A

    2. COM = C

    3. USB =B

 

[15]

Question 3 - System software - 10 marks

  1. Basic Input and Output System  (1)
  2. ROM, primary memory (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) 
  5. A virus is a program which can be replicated  (1) and it causes damage.  (2) 
  6. Opening infected email attachments, connecting to infected files on a networks, using infected stiffies, downloading programs from the Internet (2)

[10]

Question 4 - Data communication - 15 marks

  1. share expensive hardware, sace on capital expenses, centralisation of data, communications security (not cheaper) (2)
  2. All the data could be stored on the server, pupils could then use different computers (2) 
  3. Network interface card (not network card)  (1) 
  4. The layout of the network (1)
  5.  (4)
    1. bus 
    2. ring 
    3. star 
    4. bus / star 
  6. A device where all the cables come together (1) so that the computers on the network can communicate  (1) 
  7. Add new users, give rights, document network, install antivirus software ( (2) 
  8. Immune to eavesdropping, high transmission rates, reliable and secure  (1)

[15]

Question 5 - Social implications and ethical issues - 10 marks

  1.  
    1. advantages -Quick; Easy to use; Business transactions quicker; Saves paper; Neat and legible; Send mail to a number of people at once; Cheaper to send
    2. disadvantages - Not private; Information may get lost; Info may be intercepted; Send Viruses; E-mail bombs; Unwanted junk mail (SPAM); Loss of character. Not personal; Need to be connected to Internet to send e- mail; Many people still don’t have email addresses (4)
  2. Digital code attached to an electronically transmitted message that uniquely identifies the sender . (2)
  3. ATMs, Internet banking, cell phone banking  (2)

[10]

Question 6 - Utilities and Operating System - 5 marks -  ½ each.

  1. Backup  - J - Way to protect important data
  2. Defrag - I - Stores files in a continuous block of sectors 
  3. Explorer - D - Gives access to files and drives
  4. Format - A - Creates files structures on a disk 
  5. Operating system - E - Linux 
  6. Recycle bin - H - Storage area for files that have been deleted
  7. Registry - B - Database that contains information on the system
  8. Restore - G - Restores files that were deleted or lost 
  9. Scandisk - C - Diagnoses the state of disks 
  10. Utilities - F - Relates to system management

[5]

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