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451/1 Computer Studies Question Paper

451/1 Computer Studies

Course:Computer Studies

Institution: Form 4 Mock question papers

Exam Year:2010

NAME ………………………………………………. INDEX NO……………..…… DATE………………...
SCHOOL ……………………………………………… CANDIDATES SIGNATURE……………………...

451/1
COMPUTER STUDIES
PAPER 1
(THEORY)
JULY/AUGUST 2008
TIME 2 ½ HOURS

LAICOMET 2010
Kenya Certificate of Secondary Education

451/1
COMPUTER STUDIES
PAPER 1
JULY /AUGUST 2008

INSTRUCTIONS TO CANDIDATES:

? Write your name and Index number in the spaces provided above.
? 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 answer should be written in the spaces provided

SECTION QUESTIONS CANDIDATE’S SCORE
A 1-15

B 16
17
18
19
20
TOTAL SCORE

SECTION A (40MARKS)
Answer All questions from this section
1. What is peripheral device? (1mk)
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2. Highlight the use of find and replace features in word processors. (2mks)
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3. List three factors to be considered when purchasing a microcomputer. (3mks)
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4. Identify two proper sitting postures while using computer. (2mks)
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5. Distinguish between cold booting and warm booting. (2mks)
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6. Computer system are built from three type of physical components: processor , memories and input/output devices
(i) State two tasks of processor. (2mks)
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(ii) List any four examples of computer output devices. (2mks)
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7. Give two advantages of a Digital Versatile Disk over a normal compact disk. (2mks)
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8. State two health issues that may result from prolonged use of computers. (2mks)
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9. Describe the role of an operating system in. (4mks)
(i) Memory management.
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(ii) Job scheduling.
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(iii) Error handling.
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(iv) Resource control.
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10. Explain why Two’s compliment is preferred to one’s complement in computing. (1mk)
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11. List three factors to be considered when choosing an electronic data processing method. (3mk)
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12. a) List two disadvantages of using computers. (2mks)
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b) Give two factors that should be considered before enrolling for an ICTcourse in a
college. (2mks)
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13. What is meant by the term Dry running as used in program development? (2mks)
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14. Computers have evolved through a number of generations. List any three characteristics of the First generation of computers.
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15. A worksheet contains the data as shown below
A B C D E F G
1 5 10
2 7 15
3 10 17
4
5
6
7
8
9
10
a) The formula = COUNTIF (C1:C3, “>10”) was entered at G1.Writedow the value that was displayed. (1mk)
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b) Write down the formula that would be entered at cell B7 to sum the values in column A whose values are greater or equal to 5. (2mks)
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c) The formula = $C2 + C$3 is entered in cell C5 and then copied to D10. Write down the formula as it appears in the destination cell. (2mks)
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SECTION B (60MARKS)
Answer question 16 and any other 2 questions from this section
16. a) State the three basic types of program control structures. (3mks)
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b) Draw a flowchart which will simulate the processing of student’s report. The simulation should be such that the user repeatedly inputs marks per subject for six subjects using a looping control structure. The computer processes the total marks and mean score of the student.
Note. 1. It is assumed that the student does six subjects
2. The output required is; average score and total marks. (7mks)

c) Differentiate between Analogue and Digital data. (2mks)
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d) Outline three advantages of using computer for data processing over other types of
office and business equipment. (3mks)
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17. a) (i) State the purpose of registers in computer system. (1mk)
(ii) Give two types of register in a computer system. (2mks)
b) Describe the structure of hard disk in reference to cylinders, tracks and sectors. 3mks)
c) Highlight four factors one should consider when purchasing a printer. (4mks)
d) Give two advantages of using electronic point-of-sale terminal as opposed to
manual entry at a supermarket checkout counter. (2mks)
e) A school board of governors intends to put up a computer laboratory. Suggest three
factors to be considered in accomplishing the above task. (3mks)
18. a) Your school decides to replace its control system. The current system was implemented ten years ago but has restricted reporting facilities and has a text-based interface.The school intends to replace the old system with a new computerized system, and is now considering both ‘parallel running’ and ‘direct changeover’.
i) Briefly explain the term parallel running and direct changeover as used in system
implementation. (2mks)
ii) Give two disadvantages of direct changeover over parallel running. (1mk)
iii) Identify two main risks of direct changeover during system implementation. (2mks)
iv) Mention any two advantages of running both his manual system and the
computerized system simultaneously. (2mks)
b) Name the three components of a spreadsheet. (3mks)
c) (i) What is a Website? (2mrks)
(ii) Name three facilities that are needed to connect to the internet. (3mks)
19. A computer user may interact with a computer either through Graphical User Interface. (GUI) or through typed commands.
a) (i) State two feature of a graphical user interface. (2mks)
(ii) Give two advantages of using GUI based operating systems over a command line
Interface. (2mks)
(iii) Some computer systems still use Command line interfaces. State one advantage
of command line interface. (1mk)
b) Explain the use of any two buttons found in a spell-check dialog box. (2mks)
c) Explain the meaning of each of the following with reference to computer crime.(4mks)
i) Tapping
ii) Piracy
iii) Trespass
iv) Fraud
d) Explain four methods of classifying computers. (4mks)
20. Differentiate between the following terms as used in computer networking. (4mks)
i) Modulation and demodulation.
ii) Multiplexing and demultiplexing.
b) State four ways in which the feasibility of a system is assessed. (4mks)
c) Explain how the following data security threats can be controlled. (4mks)
i) Viruses.
ii) Theft.
iii) Computer errors and accidental eraser.
iv) Unauthorized access.
d) Highlight three advantages of database systems. (3mks)

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451/1 Computer Studies Question Paper

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