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 SECTION A (40 marks) KCSE PREDICTION COMPUTER STUDIES P1

Answer ALL the questions in the section in the spaces provided.

1) Describe the following input/output terms as used in computer systems. Give an example for each                                                                                                                                                    (3marks)

  a) Read

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  b) Write

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2) Using relevant examples distinguish between a formula and function.                             (3marks)

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3) A publisher intends to use a desktop publishing programme to create a publication which is to have many graphics. State three ways in which the graphics may be acquired for this purpose.                        (3 marks)

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4. The management of an organisation intends to purchase a printer. State three factors that they should consider during the purchase                                                                                                              (3 marks)

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5. State three reasons why it is important to define data types of fields in a database correctly.       (3 marks)

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6. An engineering company requires a computer system to design roads and bridges.         (2 marks)

Explain one suitable choice for:

(i) output device;

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(ii) software. ​

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7. State three circumstances under which the use of wireless communication would be preferred in data communication.                                                                                                                       (3 marks)

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8. Headache, back and neck pain may result from the use of computers. State how each of them can be minimized                                                                                                                                           (2 marks)

(a)Headache

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(b) Back & Neck Pain

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9. Explain the importance of each of the following in word processing:

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(i)         tab stops;                                                                                                                     (2 marks)

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(ii)       Section breaks.                                                                                                            (2 marks)

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10. State three problems associated with using e-mail technology for communication         (3 marks)

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11. State two ways in which each of the following can be prevented

(a)        Software errors                                                                                                            (1 mark)

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(b) Computer fraud                                                                                                                 (1 mark)

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12. Differentiate between analogue data and digital data as used in computers                    (2 marks)

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13. State four properties that an operating system displays about a file                                (2 marks)

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14. State the functions of each of the following keys on the computer keyboard                  (2 marks)

(a)        backspace;

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(b)        insert (ins)

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15. Give three file organization methods in a computer                                                        (3 marks)

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SECTION B (60 Marks) KCSE PREDICTION COMPUTER STUDIES P1

Answer question 16 and any other THREE questions from this section in the spaces provided.

16.(a) State three ways in which a programmer can make program code easy to fol1ow                 (3 marks)

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(b)  Study the flowchart below and use it to answer the questions that follows;

(i) State the output of the above program flowchart for the inputs given below                   (3 Marks)

Amount = 15,000, 14,000 and 23,000 respectively

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(ii) State the purpose of the flowchart                                                                                        (1 Mark)

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(iii) Write a pseudocode for the flowchart in question (16. c) above                                     (8 Marks)

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17. (a) Interpret each of the following spreadsheet formula:

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​(i) = countif(A2:A9, “>=E7”)                                                                                                             (2 marks)

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​(ii) =sumif(B2 :B10, “WP”, D3 :D11)                                                                                               (2 marks)

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(b) The figure below shows relationships between tables in a database.

Identify two primary and two foreign keys used in the relationship.                                     (4 marks)

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…………………………………………………………………………………………………………………….(c)(i) Convert the hexadecimal number C7D16 to its equivalent decimal number                         (2 Marks)

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(ii) Using the twos compliment and 8-bit notation subtract 27 from 12 leaving your answer in binary notation                                                                                                                                   (5 Marks)

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18.       (a) Explain three circumstances under which observation method may be preferred during data

collection                                                                                                                     (6 marks)

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            (b) Describe each of the following types of maintenance

            (i) Perfective;                                                                                                              (2 marks)

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            (ii) Corrective;                                                                                                            (2 marks)

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            (iii) Adaptive.                                                                                                             (2 marks)

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            (c) Name three approaches that may be used to replace an old system with a new computerized system                                                                                                                                                (3 marks)

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19. (a) With the aid of a diagram, describe the time sharing mode in computer data processing (5 marks)

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(b) A company’s management has opted to use computers to process data. State four factors that the management needs to consider when selecting the company data processing mode.            (4 marks)

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(c) Describe each of the following validation checks as used in data processing

(i) Preserve check                                                                                                                   (2 marks)

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(ii) Data type check                                                                                                                 (2 marks)

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(iii) Check digit                                                                                                                      (2 marks)

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20. (a)State the function of each of the following

(a) Network Interface Card                                                                                                   (1mark)

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(b) Modem                                                                                                                              (1 mark)

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(c) Repeater                                                                                                                            (1 mark)

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(d) Crimping tool                                                                                                                    (1 mark)

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(b) State any two reasons why the fibre optic cable is preferred for data transmission over the other cables                                                                                                                                                 (2 marks)

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(c) State three functions of networking operating systems other than providing network security.  (3 marks)

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 (d) A company has three branches X, Y and Z where X is the headquarter. The local area network (LAN) at X is directly connected to the LAN at Y and directly to the LAN at Z. Explain two benefits of having the LAN at Y also directly connected to the LAN at Z.                                                                           (4 marks)

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(e) The figure below shows a network topology . use it to answer the questions that follows:

(i) What is the name of the topology?                                                                                    (1 mark)

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(ii) What is the work of the part labelled T.                                                                           (1 mark) ………………………………………………………………………………………………………………….

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