Computer Studies Paper 1 Questions and Answers - KCSE 2022 Mock Exams Set 1

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INSTRUCTION TO CANDIDATES

  • Write your name and index number in the spaces provided above
  • This paper consists of Two sections A and B
  • Answer ALL questions in section A
  • Answer question16 and any other THREE questions from section B
  • All answers should be written in the spaces provided on the question paper

FOR EXAMINER’S USE ONLY

SECTION

QUSTIONS

CANDIDATE’S SCORE

A

1 -15

 

B

16

 

17

 

18

 

19

 

20

 

 

TOTAL SCORE

 

QUESTIONS

SECTION A (40 MARKS)
Answer ALL the questions in SECTION

  1. Mention two devices that can connected to the computer via HDMI cable (2marks)
  2. State three ways in which ICT can be used to enhance customer service delivery in a supermarket (3marks)
  3. Describe two roles of a Web designer (2marks)
  4. Mr. Kamau is a teacher at Chianda High School used Ms-Excel to process the marks obtained by his student during the term. The table below shows the details entered in the Ms-Excel worksheet
     

    A

    B

    C

    D

    E

    F

    G

    H

    I

    1

    Name

    CAT1

    CAT2

    CAT TOTAL

    EXAM

    TOTAL MARKS

    POSITION

    GRADE

    REMARK

    2

    Mark Jama

    14

    06

    20

    56

    76

    1

     

     

    3

    Caleb Wekeza

    13

    08

    21

    34

    55

    6

     

     

    4

    Kanini Mulue

    10

    04

    14

    59

    73

    3

     

     

    5

    Justine Melanie

    11

    07

    18

    57

    75

    2

     

     

    6

    Julia Wahome

    06

    09

    15

    48

    63

    5

     

     

    7

    Austin Kilome

    08

    07

    15

    50

    65

    4

     

     

    Hints
    CAT1is out 15, CAT2 is out 15 and Exam is out 70
    1. Give the formula used to calculate the Total Marks for Julia Wahome (1mark)
    2. Write a function that give each student his position in class based on the performance (2marks)
    3. Write a logical function that will display the following remarks in column I (2marks)

      Total Marks

      Remark

      0 - 49

      Fail

      50 - 59

      Above Average

      60 - 69

      Fair

      70 - 79

      Good

      80 - 100

      Excellent

  5. Give two reasons to justify why SATA cables are used in modern computers to connect the hard disk to the motherboard (2marks)
  6. Give three file systems supported by windows operating system (3marks)
  7. Describe the use of the following keys found on a standard keyboard (2marks)
    1. Esc
    2. Prt sc
  8. Explain the following terms with references to algorithm
    1. Definiteness (2marks)
    2. Finiteness (2marks)
  9. Mention two ICT related courses offered in Kenyan universities at undergraduate level (2marks)
  10. What is flaming (2marks)
  11. A computer operator was working with a computer using windows operating system. After sometimes he started experiencing the following problems
    • Abnormal restarting
    • Computer failing to load the operating system
    • Computer hangs
    • Computer displaying Fatal Exception error on the screen
      State three possible causes of the problems mentioned above (3marks)
  12. Identify two limitations of traditional approach to system development (2marks)
  13. Use flowchart to demonstrate how IF THEN and REPEAT...... UNTIL can be implemented (2marks)
  14. State three functions of Repeater stations in data communication (3marks)
  15. Describe three layout guides available in DTP that assist a user to place an object in a preferred position (3marks)

SECTION B (60 MARKS)

  1.                            
    1. State three features of a compiler (3marks)
    2. When writing a computer program programmers are always advised to use approaches and techniques that makes the program easy to follow and maintain. List four ways in which a programmer can make program code easy to follow (4marks)
    3. Study the flowchart below and use it to answer the questions that follow
      16 assS
      1. Given that the user keyed in 3 as the value of a and 1 as the value of b get the final output of the flowchart (3marks)
      2. Use a pseudo code to represent the flowchart in (c) (5marks )
  2.                            
    1. Briefly describe the three main coding schemes (3marks)
    2. Convert the following numbers to binary number
      1. B2.AAH (3marks)
      2. 13/64 base 10 (3marks)
    3. The table below was created using Ms-Access use it to answer the questions that follow
      Table Name: Product

      Product ID

      Product Name

      Unit Cost

      Quantity

      Total

      P00101

      Milk

      120

      34

      4080

      P00201

      Bread

      100

      56

      5600

      P00301

      Beans

      150

      45

      6750

      1. State the most appropriate data type for Product ID and Total (2marks)
      2. Suggest how you would set the input mask for the Product Name so that the data entered in that field appear the way they are in the table (2marks)
      3. Represent the dynaset shown below in a SQL form given that the table Name is product (2marks)

        Product ID

        Product Name

        Unit Cost

        Quantity

        Total

        P00101

        Milk

        120

        34

        4080

  3.                              
    1. Describe four services available in the internet that support communication only (4marks)
    2. Modern computing have embraced the use of drop box, google drive and OneDrive. These platforms are hosted by the internet and many computer users prefer backing up their data using these facilities. Give three reasons to justify this phenomenon (3marks)
    3. Janetitle a computer student from Maranda High school launched the browser to access the internet , the browser displayed an error message Server Not Found on the screen this didn’t allow Janetitle to access the internet. State three possible causes of this anomaly (3marks)
    4. Briefly describe the following features of word processor (2marks)
      1. Subscript
      2. Drop cap
    5. State two arithmetic operation that can be performed on a row of a numeric data in a word processor table (1mak)
    6. In each case of (e) above give the expression used (2marks)
  4.                                
    1. Enumerate four breakthrough in health care instigated by ICT (4marks)
    2. Mention four application areas of Artificial Intelligence (3marks)
    3. List three scanning devices available at Electronic Point Sale Terminal (3marks)
    4. Describe two ways of preventing eavesdropping (2marks)
    5. System failure is considered as threat to data security. Describe three measures an organization should put in place to guard against system failure (3marks)
  5.                      
    1. Identify modes of data communication represented in (i), (ii), (iii) and (iv) below (4marks)
      1. Principal Addressing students in assembly using public address system
      2. WhatsApp chat
      3. Phone conversation
      4. Walkie talkie conversation
    2. List three challenges experienced by computer networks that are set up using twisted pair cables (3marks)
    3. Study the diagram below and use it to answer the questions that follow
      20 dadada
      1. Identify the parts labelled A, B and C in the diagram above (3marks)
      2. State function of the part labelled A (2marks)
    4. Name any three components of virtual reality (3marks)

MARKING SCHEME

  1. Mention two devices that can connected to the computer via HDMI cable
    • Projector
    • Digital camera/camcorder
    • Monitor
    • DVD , Blu-ray and Ultra HD player
    • Game consoles
      Award 1 mark each max 2
  2. State three ways in which ICT can be used to enhance customer service delivery in a supermarket
    • Through ecommerce customers can easily placing orders without visiting the supermarkets
    • Electronic payment platforms can be used to settle bills which is safe and efficient
    • Electronic points of sale terminal help in serving the customers very fast and also generate very accurate bills
    • Supermarket websites contain information which customers can easily access through the internet which help in creating customer awareness
      Award 1 mark each max 3
  3. Describe two roles of a Web designer
    • Develop and test websites
    • Enforce security measure in a website
    • Update and modify the content of the website to ensure that it contains the most current information
      Award 1 mark each max 2
  4. Mr. Kamau is a teacher at Chianda High School used Ms-Excel to process the marks obtained by his student during the term. The table below shows the details entered in the Ms-Excel worksheet
     

    A

    B

    C

    D

    E

    F

    G

    H

    I

    1

    Name

    CAT1

    CAT2

    CAT TOTAL

    EXAM

    TOTAL MARKS

    POSITION

    GRADE

    REMARK

    2

    Mark Jama

    14

    06

    20

    56

    76

    1

     

     

    3

    Caleb Wekeza

    13

    08

    21

    34

    55

    6

     

     

    4

    Kanini Mulue

    10

    04

    14

    59

    73

    3

     

     

    5

    Justine Melanie

    11

    07

    18

    57

    75

    2

     

     

    6

    Julia Wahome

    06

    09

    15

    48

    63

    5

     

     

    7

    Austin Kilome

    08

    07

    15

    50

    65

    4

     

     

    Hints
    CAT1is out 15, CAT2 is out 15 and Exam is out 70
    1. Give the formula used to calculate the Total Marks for Julia Wahome
      • =D6+E6
      • = B6+C6+E6
      • =Sum(B6,C6,E6)
        Award 1 mark max 1
    2. Write a function that give each student his position in class based on the performance
      • =Rank(F2, $F$2:$F$7,0)
        Award 1 mark for Function, Bracket to Bracket 1 mark
    3. Write a logical function that will display the following remarks in column I

      Total Marks

      Remark

      0 - 49

      Fail

      50 - 59

      Above Average

      60 - 69

      Fair

      70 - 79

      Good

      80 - 100

      Excellent

      • =IF(F2>=80, “Excellent”, IF(F2>=70,”Good”,IF(F2>=60,”Fair”, IF(F2>50, “Above average”, “Fail”))))
        Award 1 mark for function, Bracket to bracket 1
  5. Give two reasons to justify why SATA cables are used in modern computers to connect the hard disk to the motherboard
    • SATA support fast data transmission
    • Small in size
    • Support multiple drives
      Award 1 mark each max 2
  6. Give three file systems supported by windows operating system
    • File Allocation Table (FAT32)
    • New Technology File System (NTFS)
    • Extended File Allocation Table (extFAT)
      Award 1 mark each max 3
  7. Describe the use of the following keys found on a standard keyboard
    1. Esc
      • Interrupt or cancel the current process or running programs or to close a pop-up window
    2. Prt sc
      • Send a current screen image to the clipboard /take current screenshot
        Award 1 mark each max 2
  8. Explain the following terms with references to algorithm
    1. Definiteness
      • Steps or statement in the algorithm must convey one meaning
    2. Finiteness
      • An algorithm must start at one point and also terminates after a number of logical steps
        Award 2 marks each max 4
  9. Mention two ICT related courses offered in Kenyan universities at undergraduate level
    • Bachelors of Computer Science
    • Bachelors of Information Technology
    • Bachelors of Business Information Technology
    • Bachelors of Computer Security and Forensic Studies
    • Bachelors of Computer Technology
    • Bachelors of Software Engineering
      Award 1 mark each max 2
  10. What is flaming
    • Refer to write on-line messages that use derogatory , obscene or dirty language
      Award 2 marks max 2
  11.                                
    1. A computer operator was working with a computer using windows operating system. After sometimes he started experiencing the following problems
      • Abnormal restarting
      • Computer failing to load the operating system
      • Computer hangs
      • Computer displaying Fatal Exception error on the screen
    2. State three possible causes of the problems mentioned above
      • Hardware conflicts
      • Missing system failures due to improper installation of the operating system
      • Insufficient memory
      • Corrupt system registry/ Virus infection
      • Due to interrupt request conflicts
        Award 1 mark each max 3
  12. Identify two limitations of traditional approach to system development
    • No formal documented methodology
    • May take a longer period to deliver a system
    • It difficult to make decision especially where some many people are involve in the development process
      Award 1 mark each max 2
  13. Use flowchart to demonstrate how IF THEN and REPEAT...... UNTIL can be implemented
    13 fafafa
    Note that the flowchart symbols must correct and well labelled
    Award 1 mark each max 2
  14. State three functions of Repeater stations in data communication
    • Clean the signals
    • Amplify the signals
    • Retransmit signals
      Award 1 mark each max 3
  15. Describe three layout guides available in DTP that assist a user to place an object in a preferred position
    • Ruler guides: a ruler on the edges of the page that guides a user to position objects and resize them
    • Margin guides: used to define page margins so that the user will be prevented from placing objects in non-printable areas of the page
    • Column guides: Vertical lines used to divide a page into two or more columns
    • Row guides: Lines used to divide a publication page into two or more section to help structure the layout
    • Snap points: Positions on the screen where the object is stuck on
  16.                      
    1. State three features of a compiler
      • Convert the entire source into machine
      • Store the object code
      • Report all the error in a source code
        Award 1 mark each max 3
    2. When writing a computer program programmers are always advised to use approaches and techniques that makes the program easy to follow and maintain. List four ways in which a programmer can make program code easy to follow
      • Internal documentation/ Use of comments
      • Code indentation
      • Correct use of reserved words/Keywords
      • Proper punctuation
        Award 1 mark each max 4
    3. Study the flowchart below and use it to answer the questions that follow
      flow fafafa
      1. Given that the user keyed in 3 as the value of a and 1 as the value of b get the final output of the flowchart

        A

        B

        T

        3

        1

        10

        4

        2

        20

        5

        3

        34

        6

        4

        52

        7

        5

        74

        8

        6

        100

        Award ½ mark for each step max 3
      2. Use a pseudo code to represent the flowchart in (c)
        START
                    Input a, b
                    Repeat
                                T=a2 +b2
                                a = a +1
                                b = b +1
                    Until T > 90
                    Print a, b
        STOP
  17.                          
    1. Briefly describe the three main coding schemes
      • Binary Coded Decimal- This a 4 bit coding scheme that represent numeric characters only. It can represent up to a maximum of 16 characters
      • Extended Binary Coded Decimal Interchange Code- It is 8 bit coding scheme used to represent both numeric and non-numeric characters. Can represent up to a maximum of 256 characters
      • American Standard Code for Information Interchange – It is a 7 bit coding scheme representing both numeric and non-numeric characters. It can represent up to a maximum of 128 characters
        Award 1 mark each max 3
    2. Convert the following numbers to binary number
      1. B2.AAH
        A = 1010
        B = 1011 ...................................................... I mark
        2 = 0010
        Whole Number Part 10110010. .......................... ½ mark
        Fraction part.
        0. 1010102 ................................................................................................................... ½ mark
        10110010.1010102 ..................................................................... 1mark
      2. 13/64 base 10

        13/64 Is the same as 0.203125 .............................................. 1mark

        0.203125 x 2  =

        0.40625

        0.40625 x2  =

        0.8125

        0.8125 x2 =

        1.625

        0.625 x2=

        1.25

         0.25 x 2=

        0.5

        0.5  x 2

        1.0

        0.0011012 ......................................................... 1mark

    3. The table below was created using Ms-Access use it to answer the questions that follow
      Table Name: Product

      Product ID

      Product Name

      Unit Cost

      Quantity

      Total

      P00101

      Milk

      120

      34

      4080

      P00201

      Bread

      100

      56

      5600

      P00301

      Beans

      150

      45

      6750

      1. State the most appropriate data type for Product ID and Total
        • Product ID – Short Text/Text
        • Total – Calculated
          Award 1mark each max 2
      2. Suggest how you would set the input mask for the Product Name so that the data entered in that field appear the way they are in the table
        • Type >L<?????????????
          Award 2 marks max 2
      3. Represent the dynaset shown below in a SQL form given that the table Name is product (2marks)

        Product ID

        Product Name

        Unit Cost

        Quantity

        Total

        P00101

        Milk

        120

        34

        4080

        SELECT Product [ProuctID], Product.[Product Name],Product.[Unit Cost], Product.[Quantity]. Product.[Total]
        FROM Product
        WHERE (((Product.[Product Name])="Milk"));
        Award Select ½ mark
        From 1mark
        Where 1 mark
  18.                              
    1. Describe four services available in the internet that support communication only
      • Email- it is a message transmitted electronically over the internet. The message can be text, video, audio or picture based
      • www. – Virtual storage in the internet where information is stored and made available to users. The information in a www can be accessed from anywhere provided there internet connectivity
      • Social media. - Web based site that allow people with common interest to share information, interest, activities and multimedia contents. They include Whattapps, Tweeter, Facebook etc.
      • instance messaging- Messaging service that allow two or more people to communicate directly
      • Fax – Involves the use of computer to send fax messages
        Award 1 mark max 4
    2. Modern computing have embraced the use of drop box, google drive and OneDrive. These platforms are hosted by the internet and many computer users prefer backing up their data using these facilities. Give three reasons to justify this phenomenon
      • Flexible in that it can be accessed from any point provided there is internet connectivity
      • Mass storage
      • Secure
      • Back up and restoration
      • Enhance collaboration and sharing of data
      • Low maintenance cost
        Award 1 mark each max 3
    3. Janetitle a computer student from Maranda High school launched the browser to access the internet , the browser displayed an error message Server Not Found on the screen this didn’t allow Janetitle to access the internet. State three possible causes of this anomaly
      • Bad internet connection
      • Wrongly configured network settings
      • Compatibility issues with app and antivirus
        Award 1 mark each max 3
    4. Briefly describe the following features of word processor
      1. Subscript
        • This feature allow the user to type a line of text slightly below the normal typing line Example CH4
      2. Drop cap
        • This feature is used to make the first character of a paragraph bigger than other characters in paragraph so as to capture the attention of the reader
          Janetitle a computer student from Maranda High school launched the browser to access the internet , the browser displayed an error message Server Not Found on the screen this didn’t allow Janetitle to access the internet. State three possible causes of this anomaly
          Award 1 mark each max 2
    5. State two arithmetic operation that can be performed on a row of a numeric data in a word processor table
      • Addition
      • Multiplication
      • Counting
        Award ½ mark each max 1
    6. In each case of (e) above give the expression used
      • =Sum (left)
      • =Product (left)
      • =Count (left)
        Award 1 mark each max 2
  19.                                  
    1. Enumerate four breakthrough in health care instigated by ICT
      • Telemedicine
      • Laser surgery
      • MRI
      • CitiSCAN
        Award 1 mark each max 4
    2. Mention four application areas of Artificial Intelligence
      • Expert System
      • Artificial Neutron Network
      • Natural Language Processing
      • Robotics
        Award 1 mark each max 4
    3. List three scanning devices available at Electronic Point Sale Terminal
      • Finger print scanner
      • Card reader
      • Optical Barcode Reader
      • QR Scanner
        Award 1 mark each max 3
    4. Describe two ways of preventing eavesdropping
      • Encryption and decryption –Data that is on transit is changed in a form that cannot easily be read or interpreted. The conversion is done that the sending and receiving point
      • Firewalls filters data and information exchange between different networks by enforcing network access control policy
        Award 1 mark each max 2
    5. System failure is considered as threat to data security. Describe three measures an organization should put in place to guard against system failure
      • Regular system backup
      • Protect the computer from unstable power
      • Incorporate fault tolerant systems
        Award 1mark each max 3
  20.                      
    1. Identify modes of data communication represented in (i), (ii), (iii) and (iv) below
      1. Principal Addressing students in assembly using public address system
        • Simplex
      2. WhatsApp chat
        • Duplex
      3. Phone conversation
        • Full Duplex
      4. Walkie talkie conversation
        • Duplex
          Award 1 mark each max 4
    2. List three challenges experienced by computer networks that are set up using twisted pair cables
      • Suffer from high attenuation
      • Sensitive to electromagnetic interference and eavesdropping
      • It has low data transmission rates
        Award 1 mark each max 3
    3. Study the diagram below and use it to answer the questions that follow
      1. Identify the parts labelled A, B and C in the diagram above
        • A - Satellite
        • B – Receiving Earth Station
        • C—Uplink Communication
          Award 1 mark each max 3
      2. State function of the part labelled A
        • Receives , amplify and retransmit the signals to the receiver earth station
          Award 2 marks max 2
    4. Name any three components of virtual reality
      • Headgear
      • Glove
      • Body suit
      • Virtual reality software
        Award 1 mark each max 2

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