PHS CyberSchool

Computer Studies SG Grade 11 - 2003

Last updated 09 November 2004

Theory examination November 2003 - 90 minutes - 100 marks - answers

Section A - Multiple-choice questions - 20 marks

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

Section B - Computer Architecture - 16 marks

1.  
   1. A bus is an electronic pathway along which signals can be sent from one part of a computer to another (1)
   2. .
      1. Data bus - data and instructions moved between CPU and memory (2) 
      2. Address bus - memory address moved between CPU and memory (2) 
      3. Control bus - controls signals (read/write) between CPU and memory (2) 
2. Registers are used to hold the addresses of instructions and data in memory (1) that the CPU is currently working on (1) 
3. Diagram showing tracks and sectors (4) 
4. .
   1. LPT  (1)
   2. USB  (1)
   3. COM (1)

Section C - System Software and Operating Systems - 18 marks

1. .
   1. Basic Input and Output System  (1)
   2. ROM  (1)
   3. .
      1. Diagnostic Routines - tests all components (6)
      2. Initialiasing Routines- set up 
      3. BIOS functions - constructs interrupt sectors 
      4. Bootstrap Loader - obtains operating sytem from disk and loads into memory 
2. .
   1. Drivers allow the Operating system to access and control hardware not supported by the BIOS, acts as translator between device and program. (1) 
   2. All hardware needs a driver, the Windows CD may have the necessary drivers or you can try download from the Internet. (3) 
3. .
   1. A virus is a program which can be replicated  (1) and it causes damage. (1)  
   2. Email, Networks, Infected stiffies, the Internet (3) 
4. Linux Red Hat / Unix (1)

Section D - Data Communication - 20 marks

1. Capital expense, centralisation of data, communications security (not cheaper)  (3)
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. Carrier sense multiple access with collision detection  - Listen to see if network is quiet. Sends data If a collision occurs, resends data (3)
7. A device where all the cables come together so that the computers on the network can communicate (2)
8. Add new users, give rights, document network, install antivirus software (2)
9. Immune to eavesdropping, high transmission rates, reliable and secure (2)

Section E - Social and Ethical Issues - 10 marks

1. Micro processor uses less electricity  / Micro processors hard disks and monitor slip into sleep mode - when they have not been used for a certain period of time / Flat screen uses less energy / Manufacture have reduced harmful chemicals. (2)
2. Video, Sound, Special effects, Free products and adverts, Colour, Active elements. (2)
3. Digital code attached to an electronically transmitted message that uniquely identifies the sender . (2)
4. no queues, 24 hour banking, safer doing it for the security of home (2)
5. web could be slow, cannot physically draw cash, need web access, no personal contact (2)

Section F - Applications Skills - 16 marks 

1. .
   1. name, date of birth (not age), date of employment, current job, qualifications, past jobs (4)
   2. . (2)
      1. < Lower case
      2. > Upper case
2. Format / Cell / Number / Currency (1)
3. # (1)
4. Use Function Upper case? (1)
5. 1  (1)
6. 4 (1)
7. 3 (1)
8. 1 (1)
9. 4 (1)
10. 1 (1)
11. C3/C1*100 should read C3/$C$1*100 (1)