Computer Studies Paper 1 Questions with No Answers - Maseno Mock Exams 2020/2021

Kenya Certificate of Secondary Education
451/1 - COMPUTER STUDIES  - Paper 1
(THEORY)
2 ½ hours

INSTRUCTIONS TO CANDIDATES

1. This paper consists of TWO sections A and B.
2. Answer ALL questions in section A.
3. Answer question 16 and any the THREE questions from section B
4. ALL answers should be written on spaces provided on the question paper

SECTION A (40 MARKS)

Answer ALL the questions in this section

1. Explain the following input/ output terms as used in computer systems. Give an example for each (4marks)
   1. Read
   2. Write
2. Brian uses a browser to research information for her business Give three functions of a browser. (3marks)
3. List down three types of computer viruses (3marks)
4. Define the following terms as used in disk management
   1. Partitioning (1mark)
   2. Defragmenting (1mark)
5. Leonard has a new laser printer to print letters for his business. Leonard connects his printer to his computer using the USB port. Give three benefits of using the USB port to connect the printer to the computer.(3marks)
6. State Three ways in which your school librarian can use a computer (3marks)
7. Distinguish between simulation and virtual reality (2marks)
8. Give the denary value of each of the three 12-bit binary values. (3marks)
   1. 000000001100
   2. 000011000110
   3. 010011000001
9.  
   1. One of the challenges that computer organizations face is unauthorized access to computer systems. Distinguish between logical access and physical access. (2marks)
   2. State One way in which each of the types of unauthorized access to computersystems can be controlled. (2marks)
10. Give Two possible ways of fitting the document in one page (2marks)
11. Differentiate between real time processing and batch processing giving examples where each could be used (2marks)
12. Give Two advantages of an electronic spreadsheet over traditional analysis ledger sheet (2marks)
13. List Four E-mail services (2marks)
14. Clive has a laptop computer that he uses for his business. He enters a username and password to log in to his laptop. Clive is worried about spyware being used to find out his username and password. Describe how spyware could be used to find out Clive’s username and password. (3marks)
15. Suggest Two possible causes of data and program loss in computer (2marks)

SECTION B

Answer question 16 (compulsory) and any other three questions from this section

16. Glen is a landlord and she rents houses for Ksh.5500 per month. A customer is awarded a 5% discount if he/she pays rent for over six months in advance. Currently, Glen has ten rental houses which are fully occupied.
    1. Develop a pseudo code that can capture the rent payment for all the ten tenants and calculates the total amount paid and the total discount awarded. (7marks)
    2. Draw a flowchart for the above algorithms (5marks)
    3.  Program documentation is writing of support materials explaining the program.
       State Three types of program documentation (3marks)
17.  
    1. Six hardware devices are shown.Tick (✓) to show if each hardware device is an Input, Output or Storage device. (3 marks)
       

       Hardware device	Input  (✓)	Output  (✓)	Storage  (✓)
       Solid state drive (SSD)
       Sensor
       Headphones
       Microphone
       USB flash drive
       Actuator

       Solid state drive (SSD)
       Sensor
       Headphones
       Microphone
       USB flash drive
       Actuator
    2. Genevieve writes a paragraph about a barcode reader. Using the list given, complete the paragraph. Not all terms in the list need to be used.
       
       • actuators
       • binary
       • black
       • input
       • microprocessors
       • output
       • sensors
       • storage
       • white
       
       A barcode reader is an............................................... device. It shines a light at the barcode and the light is reflected back. The............................................... bars in the barcode reflect less light than the............................................... bars................................................ are used to capture the amount of reflected light and the different reflections are converted to ............................................... values.
    3. Differentiate between the following terms as used in operating system. (4marks)
       1. Interrupt handling
       2. Error handling
    4. Identify the following interfaces (2marks)
       1.  
          
       2.  
          
    5. Which of above cables is faster? (1mark) 
18.  
    1. State and explain the following types of relationship as used in database design
       1.  
          
       2.  
          
       3.   
          
    2.  
       1. Explain the difference between primary key, foreign key and an index key as used in database application (3 marks)
       2. What is referential integrity (2 marks)
    3. Explain the following features of a report layout in design view
       1. Report header (2 marks)
       2. Detail (2 marks)
19. Study the diagram below and answer the questions that follow.
    
    
    1.  
       1. Name the above cable as used in data communication media (1mk)
       2. Name the parts labeled X, Yand Z (3marks)
          X ……………………………………………….
          Y……………………………………………….
          Z……………………………………………….
       3. Highlight any three advantages of the above cable. (3marks)
    2.  
       1. Explain the VSAT technology (2marks)
       2. Explain the differences between the Ethernet topology and token ring topology. (2marks)
    3. Explain the four main components of satellite communication systems (4marks)
20.  
    1.  
       1. What is system entropy? (1 mark)
       2.  Explain four factors to consider when designing a file during requirement specification (4marks)
    2. Explain the following types of systems maintenance (4marks)
       1. Perfective maintenance
       2. Adaptive maintenance
    3. State the advantages of questionnaire as mode of information gathering (3 marks)
    4. State three benefits of system prototyping (3 marks)