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Computer Studies Question Paper

Computer Studies

Course:Computer Studies

Exam Year:2010

NAME:……………………………………………… INDEX ……………… DATE……
SCHOOL:………………………………………………… SIGNATURE………………………

451/1
COMPUTER STUDIES
PAPER 1
(Theory)
JULY/AUG.2010
2 1/2 HOURS

BELGUT /AINAMOI DISTRICTS JOINT EXAMINATION
Kenya Certificate of Secondary Education 2010.

451/1
COMPUTER STUDIES
PAPER 1
(Theory)
JULY/AUG.2010
2 1/2 HOURS
INSTRUCTIONS TO CANDIDATES
• Write your name, Index number and Adm.No. in the spaces provided above.

• This paper consists of TWO sections A & 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 questions paper.

For Official Use Only
Section
Question
Candidate''s score

Total score

SECTION A : (40 marks)
Answer all the questions in this section in the spaces provided
l. (a) What is an embedded computer? (1mark)

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(b) State the main component that formed the basis for second generation computers.(1 mark)

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2.(a) Give one function of a main frame operating system which you would not expect to find in the operating system of a micro-computer. (1 marks)

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(b) Name four examples of application software. (2mks)

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3. List four of the fields which would be expected in a database file of information about school students. (2 marks)

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4.(a) Name four examples of document
readers. (2mks)
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(b) Give one application for each of the input methods in (4.(a). (2 marks)

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5. Subtract 010112 from 110012 ( 2mks )

6. Explain the following computer crimes, ( 2mks )
(i). Fraud…………………………………………………………………………………………….
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(ii). Alteration. ……………………………………………………………………………………… …………………………………………………………………………………………………………………

7. (a) Define
(i). Firewalls (1mk)
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(ii). Data encryption. (1mk)
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8. Identify three advantages of using modular programming in system development. (3 marks)
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9. Explain the following terms as used in computing cycle. (3 marks)
(i) Fetch phase…………………………………………………………………………………………
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(ii) Decode phase…………………………………………………………………………………….
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(iii) Execution phase……………………………………………………………………………………
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10.(a) Differentiate between Cache and Buffer memories. (2 marks)
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(b) List and give the functions of computer buses. (3 marks)
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11.(a) Explain any two factors that should be considered during output design (2marks)
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(b) Why is observation sometimes disadvantageous when used in fact finding? (1 mark)
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12. Outline two major functions of UPS in computer laboratory. (2 marks)
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13.(a) State the use of:
(i)

Light pen (1mk)
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(ii) Graphics table (1mk)

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(b) Name any advantage of solid-state memories over other storage media. (1 mark)

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14. Outline four data types that can be entered into a spreadsheet. (2 marks)

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15.(a) Define virtual reality. (1 mark)

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(b) List any two applications of virtual reality. (1 mark)

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SECTION B: (60 marks)
Answer question 16 and any other THREE questions from this section in the spaces provided.
16.(a) List two examples of:

(i) Third generation languages. (2mks)
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(ii) Object oriented languages. (2mks)
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(b) Define (2mks)
(i) Object code……………………………………………………………………………………………….
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(ii)Source code………………………………………………………………………………………………
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(c) Differentiate between a compiler and an interpreter. (2 marks)
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(d) A car rental firm leases its cars for Ksh.2500.00 per day. The manager giver a discount based on the number of days that the car is rented. If the rental period is greater than or equals to 7 days then a 25% discount is given. Write a peudocode to accept a car number and the rental period, and calculate the total amount earned by the company when a car is leased. (7marks)

17.(a) State any three duties of the following ICT personnel.
(i) Systems analyst. (3 marks)
…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
(ii) Database administrator. (3 marks)
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(iii) Web master (3 marks)
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(b) Name any three ICT courses offered in the Kenyan universities. (3 marks)
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(c) Outline three advantages of telecommuting. (3 marks)
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18.(a) Define artificial Intelligence. (1 mark)
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(b) Explain the application of artificial intelligence in the following areas. (6 marks)
(i) Natural language processing
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(ii) Robotics
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(iii) Expert systems
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(b) Give any three symptoms of the following computer work-related disorders and two of their methods of prevention.
(i) Computer vision syndrome. (4 marks)
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(ii) Repetitive strain injury. (4 marks)
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19.(a) Define the term ergonomics (1 mark)
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(b)(i) Give any three advantages of using a fibre optic cable in data transmission. (3 marks)
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(ii) Name two types of fiber optic. (1 mark)
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(c) State three advantages of wireless communication. (3 marks)
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(d) Explain the following terms. (3 marks)
(i) Multiplexing
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(ii) Bandwidth
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(iii) Base band signal
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(e) Explain the use of these communication devices. (4 marks)
(i) Routers
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(ii) Hub
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20.(a) Define Internet. (1 mark)
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(b) Describe the transmission of data over a telephone line (4 marks)
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( c) Outline the ‘line of sight’ principle in wireless transmission. (2marks)
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(d) The first column in the table below contains the formulae stored in cell F10 of a spreadsheet. Enter the formula as they would appear when copied to cell M20 of the same spreadsheet. (3marks)

(e) (i) Differentiate between multiprogramming and multiprocessing. (2marks)
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(ii) Give application areas of the following data processing modes. (3 marks)
(a) Batch
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(b) Real time
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(c) On line
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