(a) Explain why the following controls should be implemented for computer based systems (2mks)
(b) For each of the following give one reason why they are not allowed in a computer laboratory.
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Explain the following terms as used in word processing (3mks)
Distinguish between Real, Integer and Character data types as used in programming ( 3mks)
 Related Searches(a) Subtract 01112 from 10012 (2 mks)00102 (b) Using two’s compliment, subtract 7 from 4 and give the answer in decimal notation (4mks)7 = 1112 4 = 1002 -4 in two’s compliment is 100 111 100 + (1)011 The resulting answer is 011 since the overflow is ignored. In decimal notation this is 310 (c) Convert(i) 91B16 to octal
(a) Name and explain the function of the keyboard keys represented by the following symbols (2mks)
(b) Simulation is one of the application areas of computers(a) Explain what the following DOS commands will do when executed
(i) A: \copy ** B
(b) (i) With the aid of a diagram, explain hierarchical (tree) network topology
A network topology that, from a purely topologies viewpoint, resembles an interconnection of star networks in that individual peripheral nodes are required to transmit to and receive from one other node only, toward a central node, and are not required to act as repeaters or regenerators.
(a) List three paragraph formatting activities in word processing(3 mks)
(a) State the stage of program development in which:
(i) A flowchart would be drawn
(b) State the output of the following flowchart segment
State two health issues that may result from prolonged use of computers
 State two health issues that may result from prolonged use of computers Arrange the following data units in ascending order of size (2mks)BYTE, FILE, BIT, NIBBLE
BIT, NIBBLE, BYTE, FILE (a) explain Binary Coded Decimal code of data representation (1mk)
(b) Write the number 45110 in BCD notation (1mk)
Outline two ways in which computer can be used in hotels (2mks)
 Name two types of relationships that can be applied in database design (2mks)
Define the term artificial intelligence (2 mks) Artificial intelligence can be defined as the field of study concerned with using computer hardware and software to simulate human thought processes such as imagination and intuition.  Consider the linear arrays:
 (a) Name the control structure depicted by the flowchart below
(b) Explain the following terms as used in program implementation (2mks)
(a) A serial file comprises of records placed in positions 1 to 10. State the position of the end of file marker (1 mk)
 (b) State the purpose of each of the following (2mks)(i) File server software
(a) State the purpose of registers in a computer system (1mk)To hold data and instructions temporarily as they are being processed in the CPU ( 2mks) (b) Name two multi-programming operating systems (2mks)Windows 9X, Linux, Windows 2000, and Windows NT  The cells K3 to K10 of a worksheet contain remarks on student’s performance such as very good, good, fair and fail depending on the average mark. Write a formula that can be used to count all students who have the remark “very good” (3mks)
(a) What is a disk formatting? (1mk)
To prepare storage medium by defining tracks and sectors where data will be placed in compliance with specific operating system requirements.
(b) Indicate whether the following devices are used for input or output (2mks)
Distinguish between the following pairs of terms
(i) Data verification and data validation
Data Validation
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