Computer Studies Paper 1 - Alliance High School Pre-Trial Examination 2018

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COMPUTER STUDIES
THEORY
Paper 1
Time: 2¹/₂ Hours

ALLIANCE HIGH SCHOOL
PRE-TRIAL 2018

INSTRUCTIONS TO CANDIDATES

• This paper consists of two sections A and B
• Answer all questions in section A
• Answer question 16 is Compulsory and other three questions from this section B

SECTION A (40MKS)
ANSWER ALL QUESTIONS IN THIS SECTION

1. Give any two differences between first and second computer generations (2 mks)
2. Distinguish between the deletion of characters using overtype and delete keys (3mks)
3. Describe the process of cold booting a computer (2mk)
4. Give two advantages of using a Graphical User Interface Operating System. (2 mks)
5. List two ways by which a software can be acquired. (2mks)
6.  
   1. Define a computer memory (1 mk)
   2. Give three examples of special purpose memories (1 ¹/₂ mk)
   3. Explain the difference between logical and physical files (2mks)
7. Perform the blowing binary operations giving your answer in decimal
   1. 11011.11 + 10101.11 (2mks)
   2. 1111.11 - 1101.01 (2 mks)
8. Mention three types of language translators (1 ¹/₂ mks)
9. List the six stages of program development in the correct order. (3 mks)
10. Explain three major elements of a computer file. ( 3 mks)
11. State the application areas of
    1. CAM (1 mk)
    2. CAD (1 mk)
12. Give three functions of a Database Management System. (3 mks)
13. Differentiate between sorting and filtering of data as applied in spreadsheets (2 mk)
14. Give three demerits of using fibre optic cables (3 mks)
15. Give three dangerous areas or industries where the use of computer simulations would be better than carrying out the real experiment. (3 mks)

SECTION B (6OMKS)
ANSWER QUESTION 16, IS COMPULSORY AND ANY OTHER THREE QUESTIONS FROM THIS SECTION

16.  
    1. Golden Well High School uses the following grading system to grade the performance of the students. Students who score below 40 are asked whether they want to continue or go home. If they want to continue, they see the principal otherwise they go home. Draw a flowchart for this program. (9 mks)
       
       

       Marks	Grade
       70-100	A
       60-69	B
       50-59	C
       40-49	D
       Below 40	E

       
       
       
    2. State three functions of a compiler, (3 mks)
    3. List three advantages of a compiler. (3mks)
17.  
    1. Define the term logical topology as used in networking (1 mk)
    2. Describe any three factors that would determine the type of network topology a firm is to adopt. (6mks)
    3. Using appropriate diagrams describe the following network topologies giving one advantage of each (8 mks)
       1. Hierarchical
       2. Star
18.  
    1. Draw a well labelled diagrammatic representation of the data processing cycle. (3 mks)
    2. Explain five types of computer processing files. (5 mks)
    3. State two advantages of these file access methods. (4mks)
       1. Random
       2. Indexed sequential
19. Use ones compliment to perform the following arithmetic operations
    1. 15₁₀-12₁₀ (4 mks)
    2. 10111₂-1011₂ (4 mks)
    3. 1101₂ is a binary representation of a negative number. Work out the three likely positive equivalents in base ten (6mks)
    4. Workout: FF₁₆-151₁₀ (2 mks)
20. 1. Define the term data control. (2 mks)
    2. Explain four data security practices that can be carried out in an organization. (8 mks)
    3.  
       1. Define the term computer fraud. (1 mk)
       2. Give an example of computer fraud. (1 mk)
    4. Differentiate between the terms eavesdropping and tapping as used in data security. (1 mk)
    5. Define the term cyberterrorism and give two examples. (2mks)