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Computer Studies Question Paper

Computer Studies

Course:Computer Studies

Institution: Form 4 Mock question papers

Exam Year:2015

NAME: ………………………………………………….. INDEX NO: …………………………………...
SCHOOL: ………………………………………………. CANDIDATE SIGN: ………………………….
DATE: ………………………………………...

451/1
COMPUTER STUDIES
PAPER 1
(Theory)
JULY/ AUGUST-2015

TIME: 2 ½ HOURS

SUBA- MBITA JOINT EVALUATION TEST-2015
Kenya Certificate of Secondary Education (KCSE)

451/1
COMPUTER STUDIES
PAPER 1
(Theory)
JULY/ AUGUST-2015

TIME: 2 ½ HOURS

INSTRUCTIONS TO CANDIDATE:
• Write your name and index number in the spaces provided.
• This paper consist of two sections.
• Answer ALL the questions in section A.
• Answer question 16 (compulsory) and any other three questions from section B.
• All answer MUST be written in the spaces provided in this question paper.

SECTION QUESTION ACTUAL SCORE
A 1 – 15
B 16
17
18
19
20
TOTAL SCORE

This paper consist of 12 printed pages.
Candidate should check the question paper to ascertain all pages are printed as indicated
And no questions are missing.

SECTION A (40 MARKS)
Answer ALL questions from this section

1. Computers are useful in libraries. State two ways. (2 marks)
……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
2. a) Explain why an impact printer is suitable for printing of multiple copies. (2 marks) ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
b) State two advantages of a laser printer over inkjet printers. (2 marks)
……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
3. One of the scripting languages used to create web pages is Hypertext Mark up Language (HTML). State two limitations of HTML. (2 marks)
……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
4. One of the functions of an operating system is to prevent deadlock situations. Explain one situation that can cause a deadlock to occur. (2 marks)
……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
5. Using well labelled diagrams, explain the two types of data signals. (3 marks) ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….

6. Study the sample Microsoft document below and answer questions that follow.

By citing examples, identify four formatting features used in the above passage. (4 marks)
……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………
7. a) One of the challenges that computer organizations face is unauthorized access. Distinguish between logical access and physical access. (2 marks)
……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….

b) State one way in which each of the above types of unauthorized access to computer systems can be controlled. (2 marks)
……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
8. Dr. Kithome would like to demonstrate a concept using a computer program on his laptop to members of his village health committee. Give two reasons why he would prefer a laptop to his desktop computer. (2 mark)
……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
9. State two features of a fifth generation computer that distinguishes it from a fourth generation
computer. (2 marks)
……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….

10. State two ways in which computer users can minimize Repetitive Stress Injury (RST). (2 marks)
……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
11. a) Name any two types of non printable guides in DTP. (1 mark)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
b) Explain the functions of each of non printable guides named in (a) above. (2 marks)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
12. Define the term gutter in relation to column setting in DTP. (1 mark) ……………………………………………………………………………………………………………………………………………………………………………………………………………….
13. State the function of the following commands on web browsers software. (3 marks)
i) Refresh button
……………………………………………………………………………………………………………………………………………………………………………………………………………….
ii) Home button
……………………………………………………………………………………………………………………………………………………………………………………………………………….
iii) History button
………………………………………………………………………………………………………………………………………………………………………………………………………………
14. a) Differentiate between absolute and relative cell referencing. (2 marks)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
b) The formula $A$4 +C$5 is typed in cell D4 and copied to cell H6. Write down the formula as it would appear in cell H6. (2 marks)
………………………………………………………………………………………………………………………………………………………………………………………………………………
15. Distinguish between data verification and data validation. (2 marks)
………………………………………………………………………………………………………………………………………………………………………………………………………………
SECTION B (60 MARKS)
Answer Question 16 (compulsory) and any other THREE questions from this section.
16. A company rents houses for Kshs. 25,000.00 a month. The manager gives a discount based on how many months of rent are paid in advance. If the payment is for 18 months or more, a 5 % discount is given. Read a house number and the rental period for which payment has been made and calculate the total amount earned by the company after discounts. The total number of houses is not known in advance and the process is terminated by house number 0. Print the number of houses and total amount earned after discounts.
a) Design a pseudo code for the above problem. (7 marks)

b) Draw a flow chart for the pseudo code in 16(a) above. (4 marks)

c) A programmer is asked to modify a program that has been in use by a company for a few years. However, there is no technical documentation for the program. List two problems that might result from this. (2 marks)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
d) Distinguish between procedural and non-procedural programming languages. (2 marks)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
17. a) Explain the role of problem identification in system development. (2 marks).
………………………………………………………………………………………………………………………………………………………………………………………………………………b) Distinguish between a primary key and a foreign key as used in DBMS. (2 marks)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………c) i) State two characteristics of a good database/file design. (2 marks) ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… ii) Differentiate between phased and parallel implementation methods. (2 marks) ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
d) i) Using appropriate examples, differentiate between distributed and centralized processing modes. (3 marks)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

ii) State two advantages and two disadvantages of each of the processing modes in 17(d) (i) above. (4 marks)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
18. a) State and explain three coding schemes used in computing. (6 marks)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………b) Using one’s and two’s complement work out 910 - 410. (4 marks)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………c) Convert 3.7510 to binary. (3 marks) ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………d) State four number systems used in computing. (2 marks) ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

19. Figure 1 Network Structure

i) Name the devices labelled: (3 marks)
A…………………………………………………………………………………………………..
B……………………………………………………………………………………………………
C……………………………………………………………………………………………………
ii) State two functions of each of the devices mentioned in (a) (1) above. (6 marks)
A……………………………………………………………………………………………………………………………………………………………………………………………………………
B………………………………………………………………………………………………………………………………………………………………………………………………………….
C…………………………………………………………………………………………………………………………………………………………………………………………………………….
b) i) Identify the network topology in the figure 1 above. (1 mark) ………………………………………………………………………………………………………
ii) State three advantages and two disadvantages of the network topology in figure above.
(5 marks) ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
20. a) Teresia a form four student out of curiosity loads three programs namely Yahoo messenger,
MS Word and windows Multi media player. She realizes that she can use the three programs simultaneously i.e. typing her notes, listening to her favourite song and answering incoming chat messages. She does not understand how a computer can perform such magic. She approaches you for an explanation. Explain to her how the computer does this. (3marks) ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
b) i) Define an expert system. (1 marks) ………………………………………………………………………………………………………………………………………………………………………………………………………………
ii) Describe the three components of an expert system. (6 marks) ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
c) State two advantages and one disadvantage of using an expert system in passing judgment in courts of law. (3 marks) ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
d) State two advantages of command line interface operating system over graphical user interface user interface operating system. (2 marks) ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

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