COMPUTER STUDIES Marking Scheme - Form 1 End of Term 1 2019 Examinations

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    1. Define a computer (2mks)
      • A computer is an electronic device that operates (works) under the control of programs stored in its own memory unit
      • An electronic device that accepts data, as input and transforms it under the influence of a set of special instructions called programs, to produce the desired output (referred to as information)
    2. Give TWO reason why a computer is refered to as an electronic device (2mks)
      • It uses electrical signals to process data
      • It is made up of electronic components and uses electric energy to operate
  1. Explain the following terms as used in computer science (6mks)
    1. Data
      • A collection of raw facts, figures or instructions that do not have much meaning to the user
    2. Data processing
      • It is the process of collecting all terms of data together & converting them into information
    3. Information
      • Data which has been refined summarized & manipulated in the way you want it, or into a more meaningful form for decision- making
  2. State four different parts that make up a computer                         (2 mks)
    • System unit
    • Monitor
    • Keyboard
    • Mouse
    • Printer
    • Modem
    • Scanner
    • Speakers
    • Graph plotters
    1. Explain the term system Unit (1mk)
      • This is the casing that houses the internal components of the computer such as the CPU and storage devices
    2. List four devices located under the cover of the system unit (2mks)
      • Central processing Unit (CPU
      • Motherboar
      • Power supply unit
      • Main memory
      • Hard disk
      • Disk drives
      • Battery
      • Buses
      • Input/ output ports
      • Video card
      • Expansion slots
  4. List any 4 characteristics of the first generation of computers. (4mks)
    • Large in physical size
    • Relied on thermionic valves (vacuum tubes) to process and store data
    • Consumed a lot of power
    • Produced a lot of heat
    • The computers constantly broke down due to the excessive heat generated; hence were short- lived, and were not very reliable
    • Their internal memory capacity/ size was low
    • Processing speed was very slow
    • Very costly
    • Used magnetic drum memory
  5. State four factors used to classify computers (4mks)
    • Physical size & processing power
    • Power
    • Functionality (mode/ method of operation)
    • Type of processor (CPU)
  6. State the differences between desktop computers and laptop computers (2mks)
    • Desktop is designed to be used when placed on a desk in an office environment. A laptop can be used comfortably when placed on the User’s lap
    • A laptop is small & portable; desktop computers are not portable
    1. Give three reasons why a mobile phone is regarded to be a computer (3mks)
      • It is electronic * uses electric energy to operate
      • It has a display unit (screen)
      • It has a keypad
      • It has a memory for storage
      • It is programmable
    2. Give four example of special – purpose computers (2mks)
      • Robots
      • Mobile phones used for communication only
      • Calculators that carry out calculations only
      • Computers used in digital watches & in petrol pumps
      • Computers used in petrol pumps
      • Computers used in washing machines
      • An automatic pilot
      • A word processor
    1. Define a microcomputer ( 1 mk)
      • A computer who’s CPU (processor) has been implemented with a microprocessor
    2.  List three factors to be considered when purchasing a microcomputer (3 mks)
      • Type of processor
      • Processing speed
      • Amount of main memory (RAM)
      • Storage capacity of the hard disk
      •  Cost of the computer
      • Speed of output devices
      • Number of users who can access the computers at the same time

  9. Identify and explain five areas where computers are used to process data(10 mks)
    • For stock control i.e. records of what is in store, what has been sold, and what is out of stock
    • For calculating customer’s change
    • For production of receipts
    • It can be used as a barcode reader
    • Manage financial transactions through the use of special cash dispensing machines called ATMs used for cash deposit & withdrawal services
    • Processing of cheques
    • For preparation of payrolls
    • Better record keeping & processing of documents
    • Provide electronic money transfer facilities
    • Entertainment e.g. watching movies, playing music, playing computer games
    • For storing personal information/ documents
    • For calculating & keeping home budgets
    • To monitor and control industries processes through the use of robots
    • For management control, i.e. to keep track of elders, bills and transactions
    • For advertisement purposes, which enable an industry to attack more customers
      Police stations
    • Matching, analyzing & keeping databases of fingerprints
    • For taking photographs & other identification details
    • For record keeping
    • For face recognition, scene monitoring & analysis which help the police carry out criminal investigations speedily
      Transport industry
    • Airports; to control the movement of aircrafts, their take off & landing using radar equipment
    • For making reservations (booking purposes)
    • Storing flight information
    • Automobile traffic control; to monitor vehicle traffic in busy towns
    • In Railways corporations; to coordinate the movement of goods & wagons
    • In shipping control, for efficient management of fleets, cargo handling & communication Offices
    • For receiving & sending of information through e- mails, fax, etc
    • Production of documents
    • Keeping of records
    1. Define the term ‘ computer laboratory’ (2 mks)
      • A computer laboratory is a room that has been specially prepared to facilitate installation of computers, and provide a safe conducive environment for teaching & learning of Computer studies.
    2. Give two factors to be considered when preparing a computer laboratory(2 mks)
      • Security of computers
      • Reliability of the source of power
      • Number of computers to be installed and the amount of space available
      • The maximum number of users that the laboratory can accommodate
  11. Why must foods and beverages be kept out of the computer room? (2mks)
    • Food particles may fall into the moving parts of the computer and damage them.
  12. State two methods of minimizing dust in a computer laboratory(2mks)
    • Fit the computer room with special curtains to reduce entry of dust particles
    • Cover the floor with carpets in order to absorb dust
    • Regular cleaning of the laboratory
    • Cover the computer devices with dust covers when cleaning the room
    1. Explain three ways that computer technology could make office more efficient       (3 mks)
      • There is easier & faster retrieval of data, i.e. they reduce the time and effort needed to access and retrieve informatio
      • Increased accuracy of data
      • Better presentation of data
      • Ensure faster processing of data
      • Ensures economic use of storage space
    2. Outline three reasons why it is important to first shut down the computer before turning it off (3mks)
      • To avoid damaging storage devices that may still be in use
      • To avoid damaging system and application files
      • To avoid loss of data and information                                               
    1. Briefly explain the term “computer booting”. (2mks)
      • Booting refers to the starting up of a computer. It is the entire process that makes the computer ready for use.
    2. Give and explain two types of booting (4mks)
      • Cold booting:
        It happens when a computer which was originally off is switched on by pressing the power button on the systems unit
        The Computer starts by checking all its components to determine whether they are functioning properly
      • Warm Booting
        This happens when a computer that was originally on is forced to restart by pressing the restart button on the system unit or by pressing a combination of keys on the keyboard (CTRL + ALT + DEL)
    1. What is a computer keyboard (2mks)
      • An input device that lets the user enter commands into the computer for execution by typing
    2. List four types of keys found on a computer keyboard, giving an example of each  ( 4 mks)
      • Function/ command keys  (F1- F12)
      • Alphanumeric keys (a-z) (0-9)
      • Special keys e.g. delete, backspace
      • Arrow keys e.g. up, down, left and right arrows
      • Navigation keys- end, home, page up, page down, insert and delete
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