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# Form 3 Computer Studies Paper 1 End of Term 2 Exam 2021

Class: Form 3

Subject: Computer Studies

Level: High School

Exam Category: Form 3 End Term 2 Exams

Document Type: Pdf

## Exam Summary

COMPUTER STUDIES
PAPER 1 (Theory) 451/1
TIME: 2HRS END-TERM 2 FORM 3

SECTION A
Answer All questions in this section

1. Identify three advantages of using computers in banking (3mks)

2. List three facilities that will ensure proper ventilation in a computer lab (3mks)

3. Give two main functions of a computer input device. (2mks)

4. What are turnaround documents? (1mk)

5. Using examples, distinguished between:
(i) Primary and secondary storage (1mk)

(ii) Fixed and removable disks (1mk)

6. Ann connected new multimedia speakers to her computer and tried to play her favorite music CD, but no sound came out. Suggest two problems that might have occurred (2mks)

7. Explain the following considerations when purchasing software (2mks)
(i) Authenticity

(ii) Portability

8. Give three ways in which operating systems are classified into (3mks)

9. Peter tried to retrieve a document file following all the steps correctly. The filename did not appear in file list box. State three causes for this. (3mks)

10. State the use of the following objects in databases. (3mks)
i) Tables

ii) Forms

iii) Query

11. i. Explain the meaning of the following as used in computer programming. (2mks)
a. Syntax

b. Semantic

ii. List three ways in which data integrity can be compromised. (3mks)

12. i. Mobile phones have become common ICT devices. Explain some of the powerful capabilities that come with some of the latest embedded operating systems (3mks)

ii. List two disadvantages of fiber optic cable over twisted wires. (2mks)

13. Describe any two types of data processing methods. (2mks)

14. State two advantages of USB port over the parallel port (2mks)

15. Differentiate between the terms signal Attenuation and Noise as used in data communication. (2mks)

SECTION B
Answer question 16 and any other three questions in this section

16. a) State three advantages of low -level languages (3mks)

b) Give two differences between a compiler and an interpreter. (2mks)

c) i) Study this flowchart and use it to answer the questions that follow.

I. Give the expected output from the flowchart when the value of Y is:
(i) 48 (1 marks)

(ii) 9170 (2 marks)

(iii) – 800 (2 marks)

II. Write the pseudo code that can be used to create a program represented by the above Flowchart. (5 marks)

17. a. Use two complement to perform the following arithmetic operations
i) 15_10 -12_10 (4mks)

ii) 10111_2- 1011_2 (3mks)

b) 1011_2 is a ones complement binary representation of negative number using four bits work out the likely positive equivalent in base 10. (4mks)

c) Convert the decimal fraction 10.375_10 into its binary equivalent (3mks) Whole numbers

d) Assuming the existence of base five, list the numbers used in the number system (1mk)

18. a) Describe each of the following data processing methods and give an example of where used. (6mks)
(i) Online processing
(ii) Batch processing
(iii) Real-time

b) Differentiate between:- (6mks)
i. Logical file and physical file

ii. Master file and back-up file

iii. Random and indexed sequential file

c) An organization is facing threats to data integrity. Explain three of how the threats can be minimized. (3mks)

19. a) Explain why a computer is able to display the correct time and date when it has just been switched on. (2mks)

b) Discuss two types of special memories found in a Computer System. (4mks)

c) i) Define a Bus with reference to a computer system. (1mk)

ii) List two examples of buses. (2mks)

d) Distinguish between a power cable and interface cable. (2mks)

e) Differentiate between the different types of RAM. (4mks)

20. a) i) Define a system. (1mk)

ii) Explain system entropy. (2mks)

b) State three circumstances that can lead to development of information systems (3mks)

c) Distinguish parallel changes over from straight change over as used in system implementation. (2mks)

d) Discuss two fact finding methods. (4mks)

e) Differentiate an open system from a closed system. (2mks)

f) List two responsibilities of a system analyst. (2mks)