COMPUTER STUDIES PAPER 1 Marking Scheme - 2017 MURANG'A MOCK EXAMINATION

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SECTION A 40 marks

  1.  
    • Computer room should be well lit to avoid eye strain
    • avoid over bright wall paints that reflect too mush light causing eye strain
    • adjust brightness of the computer monitor until the eyes feel comfortable before using the computer
    • use/fit the monitor with radiation filter screens
    • avoid using flickering monitor
    • seat for the user must be comfortable and have a straight backrest that allows someone to sit upright
    • take frequent breaks while working with a computer
  2.  
    1. insert
      • helps the user to insert or replace a character at the cursor position
    2. Delete
      • delete characters from the cursor position from left to right
  1.  
    • setup a computer network
    • maintain and enforce security measures on the network
    • monitor the use of network resources
    • maintain and trouble shoot network related problems
  1.  
    • be careful about body language, sitting arrangement, closeness etc
    • avoid personal biases in your questions and perceptions
    • interviewee must be informed in good time and topic communicated earlier
  1.  
    1. Portability refers to whether a program can be copied or installed in more than one computer
    2.  
      • in-house developed programs
      • Venue at the-shelf software purchase through a vendor
      • Open source
  1.  
    1. 10100­2 
    2. 1100.0012 
    3. 326.4488
  1.  
    • Entertainment – e.g. music, movie
    • Distribution of software
    • Archival storage
  1.  
    1. NIC – a device that creates a physical link to the computer and the transmission media
    2.  
      • length
      • Modem converts a signal from digital to analog form for the purpose of transmission over the analog media
    3. receives a signal from one section of a network, clean it to remove any distortion, boosts it and sends it to another section
  1.  
    • organize the main memory into blocks of sizes called partitions
    • assigns main memory storage partitions to data and instruction
    • Access to data is given using addressing the partition
  1.  
    • hardware configuration
    • Basic design of the computer e.g. IBM, APPLE
    • Applications intended for the computer
    • User friendliness or HCI
  1. Start                                       start
    Input                                      input
    pie = 3.14                               area = 3.14 *r*r
    area = pie*r*r                         print r, area
    print area                                     stop
    end
    p1ans 11.PNG 
  1.  
    1.  
      • one – to – one
      • one – to – many
      • many – to – many
    2.  
      • relationship based on primary and foreign keys
      • a feature that governs the nature of records in a one – to – many relationship between tables in database
  1.  
    1.  
      • inbuilt fonts – extra fonts
      • prepare at work in commercial circles
      • a typesetter can create and edit very complex text and graphical objects
      • superior image handling capabilities such as brightness, cropping and resolution
    2. Cards, certificate, newspapers, magazines, pamphlets, newsletters, books, calendars
  1.  
    1.  
      • creation
      • Transmission
      • Preparation
      • Media conversion
      • input validation
      • sorting
    2.  
      1. reference file – used for reference or lookup purposes that is required during processing
      2. Report file – used to store permanent records extracted from the master file or generated after processing operation
  1.  
    1. Fraud – use of computer to conceal information or cheat other people with the intention of gaining money or information
    2. Alteration – the legal charging of data or information with the intention of misinforming authorized users or gaining
  1.  
    1.  
      p1 ans 16a.PNG
    2.  
      • selection
      • sequence
    3. error detection methods
      • desk checking (dry-run) – going through the program while still on paper
      • using debugging utilities – enter the program editor where syntax errors are detected during translation
      • using test date – carries out trial runs
      • various data variations and extreme including good and bad data are entered to see how the program would handle them
    1. Advantages
      • immune to electro magnetic interference and ear dropping
      • fast and supports high band width
      • large distance can be covered because it has low attenuation
      • can be used in hazardous environment
      • smaller and lighter than copper

        disadvantages
      • connecting devices are expensive
      • installation is difficult
      • complex to configure
      • expensive/ difficult to repair
    2. Analog
      • made up of continuous varied wave form.
      • it is transmitted over telephone line.
      • a codec converts an analog signal to digital for transmission via a digital medium

        Digital signal
      • made up of non continuous discrete wave form
      • computers
      • a modem converts a digital signal to analog for transmission over the analog media
    3.  
      • thin net
      • Thick net
    4.  
      1. Microwave transmission consists of point to point transmissions meaning a signal is divided through a focused beam from transmitter to receiver while satellite is usually launched into speck
      2. Example of internet protocol 
        • ICPIP
        • TCP
        • IP






  1.  
    1.  
      p1 ans 19a.PNG
    2.  
      1. A:/MEMO2/Fraud
      2.  
        • do not drop the diskette down
        • don’t put heavy objects on top
        • don’t put near magnets
        • don’t remove from drive when still being read/written
      3. use of password
    3.  
      • I/O 
      • CPU
      • memory
      • secondary storage
      • communication & ports
  1.  
    1. Direct approach
      • user simply stops using old system and starts using the new one

        Parallel approach
      • old and new system are operated side by side until the new system has shown it is reliable

        Phased approach
      • parts of a new system are phased in separately either at different times or all at one in groups

        Pilot approach
      • entire system is tried out but only by some users
    2.  
      1. Private data – belongs to an individual and must be accessed through direct permission from the owner Confidential data – held by government or organization about people but can be seen by authorized people only.
      2.  
        • fit strong metallic grills and locks to doors
        • don’t welcome strangers into the lab
        • install alarms
        • employ guards
        • burglar proof
    3.  
      1.  
        • output specification
        • input specification
        • file /data/tables
        • hard ware/soft ware
      2.  
        • cost benefit analysis
        • schedule 
        • Users
        • environment
        • technology
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