Computer Studies Paper 1 Questions and Answers - Sukellemo Joint Pre Mock Exams 2022

Instructions to Candidates

• This paper consists of two sections.
• Answer ALL questions in section A
• Answer Question 16 and other THREE questions in section B.

QUESTION

SECTION A (40 MARKS)
ANSWER ALL QUESTIONS FROM THIS SECTION

1. Explain two ways in which computer can be used in the following areas. (2mks)
   1. Entertainment industries
   2. Banking
2. Write the following abbreviations in full. (2mks)
   1. POST
   2. SVGA
3. Suggest how in future the computer may be made user-friendly for persons who are visually challenged. (1mk)
4. Explain three advantages of an inkjet printer. (3mks)
5. Odhiambo a computer student at Lenana High School had the following problems.(2mks)
   1. Headache
   2. Backache
      Give the likely cause of the above problems and give the likely solution for each problem.
6.      
   1. Highlight four factor to consider when choosing an input device. (2mks)
   2. State and explain two types of computer files (2 mks)
7. Juma bought a computer with the following features.
   1. 4. 0 GB primary storage
   2. 500.0 GB SATT HDDC
   3. Dual core processor
   4. 190 TFT VDU
      What do you understand by the term dual core computer? (1mk)
8. Define a multimedia system and state two components of a multimedia system. (2mks)
9.        
   1. State the type of files which have the following file extensions and give an example for each (2mks)
      1. . BAT
      2. . XLS
   2. List four types of proof reading tools in a word process. (2mks)
10.   
    1. While Wekesa is editing a workbook data item, a # VALUE! Error occurred. Identify the cause of such error in the affected worksheet. (1mk)
    2. Distinguish between an embedded chart and a chart sheet. (2mks)
11. State four importance of the internet to the society. (2mks)
12. Draw a flowchart that can be used to find the area of a semi-circle. (4mks)
13. Define the following terms as used in desktop publishing (2mks)
    1. Master page
    2. Gutter
14. Use two complements to complete the value of Y in eight bit binary notation. (4mks)
    96₁₀+Y₁₀ = 124₁₀
15.      
    1. Natural disaster can cause loss of data and programs. State two ways of ensuring that data and programs are not lost if a disaster strikes. (2mks)
    2. State two advantages of using robots in industries. (2mks)

Section B (60 marks)
Answer Question 16 and any other three from this section.

16.        
    1. State three functions of an assembler. (3mks)
    2. Highlight three characteristics of a good flowchart. (3mks)
    3. Give two examples of a web scripting languages. (2mks)
    4. Nekta company give a discount of 16% for purchase worth sh. 10, 000 and above; 10% for purchase worth between sh. 5000 and 10,000 and none for purchase worth sh. 5,000 and below.
       Write a pseudo code for a program that would accept the value of a purchase, compute the discount, then display the new amount to be paid by a customer. (7mks)
17.  
    1. What is meant be each of the following terms as used in data security and controls. (2mks)
       1. Confidentiality
       2. Threats
    2. Jane a form four student was advised to partition a hard disk for her computer. Explain two reasons that may have necessitated this. (4mks)
    3. If one table in a database contains the fields: EMPLOYEE – ID, LAST – NAME, FIRST – NAME and HIRE – DATE and another contains the fields DEPARTMENT, EMPLOYEE – ID and SALARY, it is possible to establish a relationship between the two tables.
       1. Name the type of such a database. (1mk)
       2. What type of relationship can be established between the tables? (1mk)
       3. Provide the most appropriate data types for each of the fields. (3mks)
    4. A publishing firm designed the following publication using a DTP software.
       
       
       1. Give two reasons why the firm prefer using DTP instead of Word Processors. (2mks)
       2. Identify four formatting features used in the designing the publication. (2mks)
18.            
    1.        
       1. Give any TWO ways of representing a negative number in computer system. (2 marks)
       2. The following eight-bit pattern represents the two’s complement of an integer: 110001001. What is the decimal equivalent? (2 marks)
       3. Subtract the binary number 0011001 from 10110010. (2 marks)
    2. Describe the following types of errors in data processing, giving examples. (3mks)
       1. Truncated
       2. Transposition
       3. Transcription
    3. Give the mode of processing that can be used in the listed situations. Explain your answer. (6 marks)
       1. Generating student’s report forms at the end of the term.
       2. Railway ticket reservation.
       3. Point of sale terminal in a supermarket.
19.      
    1. Explain the meaning of the following system characteristics. (4Marks)
       1. Entropy
       2. Controls
    2. State the three functions of an information system. (3Marks)
    3. The Ministry of Education is changing the education system in Kenya from 8-4-4 to a Competency Based Curriculum (CBC) system by using a few schools to test the new system.
       1. Identify the type of change over system being used here. (1 mark)
       2. What would be the advantage of using this changeover strategy? (2 marks)
       3. State any three contents of a feasibility study report. (3 marks)
       4. State two ways in which ICT has been used in the horticulture industry. (2 marks)
20.          
    1. Describe three ways in which computers have positively impacted on education. (3 marks)
    2.     
       1. With aid of a diagram, describe a Star topology. (4 marks)
       2. State two advantages and two disadvantage of Star topology. (4 marks)
    3.     
       1. Define the term piconet. (1 mark)
       2. What is the function of a Repeater in networking? (1 mark)
    4. Explain two factors you would consider before enrolling for an ICT course in a College. (2mks)

MARKING SCHEME

1.         
   1.       
      1. Creating and playing computer games
      2. Record, synthesize, edit and ditsribute music
      3. Create animations and special effects in movies.
   2.           
      1. Processing of cheques
      2. Provision of electronic money transfer
      3. Preparation of payrolls
      4. Keep records of customers accounts
      5. Manage financial transactions by use of ATM to dispense and deposit money
2.         
   1. POST - POwer - On- Self _ test
   2. SVGA - Super Video Graphics Array
3.            
   1. Use of braille keyboard
   2. Speakers and voice inpute devices such as microphones
4.      
   • High quality printouts are produced with options of using colours
   • Relatively faster than dot matrix printers
   • Relatively cheaper compared to laser printers.
5.      
   

   Problem	Likely Cause	Solution
   Headache	Using a computer for a long period of time without taking breaks	Always take frequent breaks
   Backache	Poor sitting or use of substandard furniture	Sit in upright posture Use standard furniture/ Adjust furniture to level of comfort.

6.       
   1.    
      • Cost
      • Volume of data
      • Availability of market
      • Compatibility with your computer
      • Type of data entered
      • Speed.
   2.          
      • Master file - main file that con tains permanent as well as semi-permanent data
      • Transaction file - contains temporary data that is generated during processing - Used to update master file.
      • Sort file - Contains records arranged in pre-determined order.
      • Report file - Contains records generated after processing.
      • reference file - Contain data that is used to look up purposes.
      • Back up file - Contain copies of data./ information
7.    A computer whose motherboard has two processors.
8.      
   • Ability of a computer to process and output text, sound video and pictures
   • Components of a mutimedia system:
     • Speakers
     • CDs/DVDs
     • Sound card
     • SVGA monitor
     • Software that is able to play multimedia content.
9.         
   1.       
      1. .BAT - system file - eg, batch file used to process logfiles, run series of calculations
      2. .XLS - dta file, spreadsheet file eg Ms. Excel worksheets
   2.       
      • Spelling and grammar checker
      • Thesaurus
      • Autocomplete
      • Autocorrect
10.               
    1. Occurs when wrong type of arguement or opernad is used
    2.     
       • Embedded chart - A chart that is saved as part of the worksheet on which is created.
       • Chart sheet - A separate sheet within the workbook that contains the chart
11.            
    • Electronic mail (E-mail) has enabled faster communication.
    • E- banking has enabled esttablishment of branchless banks
    • It has enabled online shopping
    • It has enabled online/ distance learning
    • It has enabled use of social networking eg facebook, twitter etc.
12.     
    
13.      
    1. Master page- A page used in designing the general layout that is to be replicated in all othe rpages in a publication.
    2. Gutter - Blank space between two facing pages or Extra space allowance used to accomodate the binding in books and magazines
14.  Y10 = 12410 - 9610
    

    	96	Rem			124	Rem
    2 2 2 2 2 2 2	48 24 12 6 3 1 0	0 0 0 0 0 1 1		2 2 2 2 2 2 2	62 31 15 7 3 1 0	0 0 1 1 1 1 1
    = 11000002				=11111002

    →01111100₂ - 01100000₂
    1'C of 01100000 is 10011111
    2'C wil be 10011111 + 1 =
       01111100
    +10100000
    (1)000111002
    over flow bit (ignore)
    = 00011100₂
15.         
    1. Create replicates of backups in separate and remote environment.
    2.     
       • They are fast in performing tasks
       • They do not get bored of dong the same task
       • They can do tasks that are hazardous for human beings
       • They produce high quality products.
16.         
    1.           
       • Converts symbolic operations code (mnemonics) to an object code.
       • Allocates space in memory for the object code.
       • Identify errors and produce a list of all errors detected.
       • Produces a list of the source code and the object code.
       • Links the object code to the existing code libraries.
    2.             
       • Must have clear one starting point and one end point
       • Must flow ina  logical order
       • Must use the correct symbols
       • Should have short , clear and readable statements written inside the symbols.
    3.   HTML, XML, Javascript, Perl, Applescript, Coldfusion, VBscript, Python, PHP
    4. Start:
       Set x as the value of purchase
       Set d as the discount
       Set y as the new amount to be paid.
       Input x
       if x > = 10,000 then
       d= 0.16*x
       y = x -d
       Else if x > 5000 then
       d = 0.10 * x
       y = x - d
       Else
       y=x 
       end if 
       End if
       print y
       Stop
17.              
    1.            
       1. Confidentiality- sensitive data / info belonging to an organization or government should not be accessed or discussed to ujnauthorised people.
       2. Threats - Circumstances that hacve the potential to cause harm/ loss.
    2. If she wants to install two operating systems on one computer.
       To use one portion for backup purposes.
    3.       
       1. Relational database
       2. One - to - one
       3. EMPLOYEE ID - text
          LAST_NAME - text
          FIRST_NAME - text
          HIRE_DATE - Date/ time
          DEPARTMENT - text
          SALARY - currency
    4.      
       1. DTP provides wide range of templates
          Master pages are used to set common layouts
          Every item on a page is contained in a frame and can be edited and formatted independently.
       2. Bolding
          Underline
          Italicizing
          Drop cap
          Bullets
          Font(style, size and type)
          (accept for any correct formatting feature which can be identified in publicatioon above.
18.        
    1.           
       1. Sign it
          Ones complement
          Twos complement
       2. Its 1s complement is 001110110
          its 2s copmplement is 001110111
          119₁₀
       3. 10110010
          - 0011001
          10011001₂
    2.         
       1. Truncated - shortening or cutting off part of a number or a word.