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FORM 3

Name :…………………………………Adm. No :……..…………………………...

Class :……………………………………….

Date ……………………………................Student’s Signature…………………..

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COMPUTER STUDIES

FORM 3

PAPER 1

(THEORY)

TIME: 2 HRS

INSTRUCTIONS TO STUDENTS

This paper consists of TWO sections; A and B.

Answer all the questions in section A.

Answer question 16 and any other THREE questions from section B.

ALL answers should be written in the spaces provided on the question paper.

For official use only

|Section |Question |Score |

|A |1-15 | |

|B |16 | |

| |17 | |

| |18 | |

| |19 | |

| |20 | |

|TOTAL MARKS | |

SECTION A

1. Define a computer. (1 mark)

2. Distinguish between safety precautions and safety practices in the computer laboratory.(2 marks)

3. a) What is a peripheral device? (1 mark)

b) Name two examples of peripheral devices (2 marks)

4. Differentiate between the hardware and software components of a computer giving an example

of each. (3 marks)

5. Give 3 reasons why an IT manager would reject a request by a database administrator to replace

his desktop with a laptop? (3 marks)

6. Give 2 reasons why a computer system needs memory management. (2 marks)

7. a) What is a computer generation. (1 mark)

b)State four characteristics of the first generation computers (2 marks)

8. a) What is a directory? (1 mark)

b) Use a diagram to show the essential elements of a computer file. (3 marks)

9. a) What is the purpose of a section break? (1 mark)

b) What is a thesaurus? (1 mark)

c) What is italic? (1 mark)

10. How can a spreadsheet be used for scientific application? (2 marks)

11. Speech or voice input is rapidly developing means pf input to a computer.

List two advantages and two disadvantages of speech input technology. (4 marks)

12. Distinguish between a 4th generation language and scripting language (2 marks)

13. Worksheet cells are referenced using the column letter and row number e.g. D2 is cell in column D and row 2.

Use the sample worksheet provided to answer the questions below.

| |A |B |C |D |E |F |

|1 |Month |Jan. |Feb. |Mar. |April. |Total |

|2 |Fees |460 |460 |460 |460 | |

|3 |Food |300 |350 |305 |270 | |

|4 |Electricity |100 |100 |100 |100 | |

|5 |Fuel |150 |150 |150 |150 | |

|6 |Transport |380 |270 |150 |300 | |

|7 |Total | | | | | |

a) Write down the data type that is stored in cell C5. (1 mark)

b) What cell contains the data item representing transport for the month of February?(1 mark)

c) Write down the formula that may be used to compute the total in cell F6. (1 mark)

14. Give 2 ways in which irrelevance can corrupt the integrity of data. (2 marks)

15. Give 3 purposes of an Information System. (3 marks)

SECTION B – Answer Question 16 and any other THREE questions in this Section.

16.a) What is a flowchart as used in programming? (2 marks)

b) Define the following terms as used in programming, and draw a program

flowchart representing each. (6 marks)

i) Iteration

ii) Sequence

c) Write a program in a High level language to read any amount of dollars and convert it into Kenya Shillings. The output must be in Kenya Shillings.

Assume the variables, dollars, exchange rate and shillings as real numbers. (7marks)

17. a) Using ones complement, work out 84-34. (4 marks)

b) Express the result in hexadecimal. (2 marks)

c) Express the result in octal. (2 marks)

d) Express the result in Binary. (2 marks)

e) i) State one area where computers are used. (1 mark)

ii) Give any two advantages of using computers in this area. (4 marks)

18.A multinational organisation has offered to donate computers to your school.

The Board of Governors has requested you to advise on the operating system to be used by providing answers to the following questions.

a) What is an operating system? (1 mark)

b) State and briefly explain any two types of operating systems. (6 marks)

c) Briefly explain any four functions of an operating system. (8 marks)

19. a) State any three reasons why people may resist the introduction of computers at their place of

work. (3 marks)

b) Explain the difference between data privacy and data security. (4 marks)

c) State two operational methods of an organisation ensuring the security of data. (2 marks)

d) Explain the use of computers in health care. (6 marks)

20. a) How can a spreadsheet be used for data management? (2 mark)

b) Distinguish between a label and a value cell in a spreadsheet. (2 marks)

c) Distinguish between partitioning and formatting of a disk. (2 marks)

d) List 4 types of file organisation methods. (4 marks)

e) Explain the difference between source code and object code. (2 marks)

f) List any three possible causes of loss of programs and data. (3 marks)

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