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KCSE CLUSTER TESTS 24

Computer Studies Paper 1

SECTION A (40 Marks)

Answer all the question in this section in the spaces provided
1.
  1. a)Why should one connect a computer on a network (2 mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..………………………………………

5 marks

2.
  1. The CPU consists of control unit and arithmetic logic unit. State the functions of the two units (2 mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

5 marks

3.
  1. Name and explain the two types of Monitors (3 mks)

5 marks

4.
  1. State the functions keys in a computer key board
  1. Enter keys (1 mk)
    • Page up-page down keys (1mk)

    ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

    5 marks

    5.
    1. (i) Explain the importance of network software in a computer (2 mks)

      ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

      5 marks

      6.
      1. Give two advantages of using Winchester(Hard disk driver)Over compact discs

      (2 mks)

      ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

      2 marks

      7.
      1. Outline two areas were computers are used (2 mks)

      2 marks

      8.
      1. One stage of system development is system testing. Outline the advantages of this stage before implementation (1 mk)

      ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….…………

      2 marks

      9.
      1. (a)Convert 101.111102 to decimal notation (2 mks)

      ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… (b)State one advantage of using binary number system in computers(1 mk)

        2 marks

        10.

        State one function of each of the following terms (3 mks)

        (i) System unit

        …………………………………………………………………………………………………… ……………………………………………………………………………………………………

        ………………………………………………………………………...

        (ii) Ram

        …………………………………………………………………………………………………… ……………………………………………………………………………………………………

        …………………………………………..……………………………

        (iii) Modem

        …………………………………………………………………………………………………… ……………………………………………………………………………………………………

        ………………………………………………………………………...

        3 marks

        11.

        . Explain any two factors that should be put into consideration when putting up a computer laboratory. (2 marks)
        …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… ……………………………………………………………………………………………………

        2 marks

        12.

        i)Define the term graphic and give two examples (2 mks)
        …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………

        ii)List any two sources of graphic that can be used in Microsoft word (1 mk) …………………………………………………………………………………………………… ……………………………………………………………………………………………………

        …………………………………………………………………………

        3 marks

        13.

        State the functions of the following tools used in excel (3 mks)
        (a) Undo……………………………………………………………………………………………… ……………………
        (b) Insert chart……………………………………………………………………………………………………… …

        (c) Copy and paste…………………………………………………………………………………………………
        (i) Why would one prefer to use a form for data input rather entering data directly into
        a table (2 mks)
        …………………………………………………………………………………………………… ……………………………………………………………………………………………………

        …………………………………………………………..…………………
        (ii)When using wizard to create a form,list four forms layout that you can use (2 mks)
        …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… ……………………………………………………………………………………………………

        7 marks

        14.

        Give two advantages and disadvantages of impact printers (4 mks)
        …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… ……………………………………………………………………………………………………

        …………………………………………………………

        4 marks

        15.

        (a) Define the following terms
        (i)Amplitute(A)

        ……………………………………………………………………………

        …..………(1mk)

        (ii)Frequency (f)

        …………………………………………………….......................................................

        ……………………………………………………………………………………………

        …….…………….(1 mk)

        (iii)Periodic time (t)

        ………………………………………………………………………………………….. ……………………………………………………………………………………………

        ……………..……(1 mk)

        b)Distinguish between Modulation and demodulation (2 mks)

        ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………..

        ……………

        (c) Explain the concept of data representation in digital circuits (6 mks) ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………………

        ………………………………………………………………

        (d) Explain the following terms (4 mks)

        a) Bit

        ………………………………………………………………………………………

        ………………………………

        b) Bytes

        ……………………………………………………………………………………

        …………………………..

        c) Word

        ……………………………………………………………………………………

        …………………………..

        d) Anibble

        …………………………………………………………………………………

        ……………………………

        15 marks

        16.

        (a)Define the following computer crimes (1mk)
        (i) Piracy

        ……………………………………………………………………………………………

        ………………
        (ii) Industrial espionage
        …………………………………………………………………………………………………

        ……………………………………
        (

        b) Explain two ways of protecting data and information against unauthorized
        Access (4 mks)

        ………………………………………………………………………………………………… …………………………………………………………………………………………………

        …………………………………………………………………………
        (c) Explain two tasks performed by the operating system (4 mks)
        ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………………

        …………………………………………………
        (d) Differentiate between a hardware and orgware (2 mks)
        ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………………

        …………………………………………………
        (e) List down three duties of a computer trainer (3 mks)
        ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ……………………………………………………………………..…………………………

        ……………

        15 marks

        17.

        (a) Identify the human computer Interface below (2 mks)

        15 marks

        18.

        The Interim Independent Electoral Commission of Kenya introduced the use of ICT in voter Registration during 2013 general elections in Kenya.
        a) Give one way on how the use of ICT can be improved in Kenya. (1mk) ……………………………………………………………………………………………

        …………………………………

        b) Name two types of output and two types of input devices they used during that period. (4mks) ……………………………………………………………………………………………

        ………………………………… ……………………………………………………………………………………………

        ………………………………… ……………………………………………………………………………………………

        …………………………………

        c) Name two secondary storage devices that were used to store information at that time. (2mks) ……………………………………………………………………………………………

        ………………………………… ……………………………………………………………………………………………

        …………………………………

        d) Explain four disadvantages of using computers at that period. (8mks) ……………………………………………………………………………………………

        …………………………………

        ……………………………………………………………………………………………

        …………………………………

        ……………………………………………………………………………………………

        …………………………………

        ……………………………………………………………………………………………

        …………………………………

        ……………………………………………………………………………………………

        …………………………………

        ……………………………………………………………………………………………

        …………………………………

        ……………………………………………………………………………………………

        ………………………………….

        ……………………………………………………………………………………………

        ………………………………….

        15 marks

        SECTION B (60 Marks)

        V
        19.

        (a) Distinguish between the following
        (i) Sequential and serial file organization methods (2 mks)
        ………………………………………………………………………………………………… …………………………………………………………………………………………………

        …………………………………………………………………………

        (ii) Random and indexed sequential file organization methods (2 mks)
        ………………………………………………………………………………………………… …………………………………………………………………………………………………

        …………………………………………………………………………

        b) Explain the following types of data processing modes
        (i) Batch processing (2 mks)
        ………………………………………………………………………………………………… …………………………………………………………………………………………………

        ……………………………..………………………………………...
        (ii) Real time processing (2 mks)
        ………………………………………………………………………………………………… …………………………………………………………………………………………………

        …………………………………………………………………………
        (c) Define the following terms
        (i)Undo (1 mk)
        ………………………………………………………………………………………………… …………………………………………………………………………………………………

        …………………………………………………………………………
        (ii)Redo (1 mk)
        ………………………………………………………………………………………………… …………………………………………………………………………………………………

        ………………………………………………………………………...
        (d) State three ways how the internet has led to moral decay . (3 mks)
        ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………………

        ……………
        (c) List any two functions of Computer (2 mks)
        ………………………………………………………………………………………………… …………………………………………………………………………………………………

        ………………………………..………………………………………

        15 marks

        20.

        (a) Draw a diagram showing;
        (i) Digital signal (2 mks)


        (ii) Analogue signal (2 mks)


        (b) Differentiate between the following terms
        i) Data Accuracy and data timeless (2 mks)
        ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ……………………………………………………………………………..…………………

        …………………………………………………
        ii) Rounding errors and Transcriptions errors (2 mks)
        ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………………

        ………………………………………………
        c) Explain the Four stages of data processing cycle (8 mks)
        ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………………

        ………………
        ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………………

        ………………………………………………………………………………………………… ……………

        15 marks

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