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Describe virtual reality as used in computers. (2 marks)
Virtual Reality is the computer generated simulation of a three-dimensional
image or environment that can be interacted with in a seemingly real or physical way by a person using a specialized electronic head gear, 
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A school has been advised to employ a database administrator. State three responsibilities of this personnel in the school.
(b) Explain two ways in which computers can be used in the transport industry.
(c) Mary was advised to partition a hard disk for her computer. Explain two reasons that may have necessitated this. (d) Explain a reason for conducting each of the following studies in systems development: (i) Schedule feasibility; (ii) Technical feasibility.
RESPONSES
a) Possible responsibilities of a database admin in a school
Distinguish between a microwave transmission and a radio transmission.
(b) Figure 1 shows a computer, network topology. Use it to answer the questions that follow.
(i)Identify the type of topology.
(ii) State the function of each of the parts labelled A and B. (c) A computer laboratory experiences power supply problems. Describe three power related problems that should be addressed.
RESPONSES
b) (i) Bus topology
(ii) A - The Bus cable
c) Problems related to power that should be addressed
Describe three arithmetic errors that may occur during computerised data processing.
(b) Arnold a programmer intends to create a user input interface screen for a system. State three factors that he should consider.
(c)With the aid of an example in each case describe the following types of maintenance. (i) adaptive; (ii) perfective; (iii) corrective.
RESPONSES
a) Arithmetic errors
Truncation error
(i) Adaptive
A school intends to install wireless media in their communication system. State three advantages of this mode of communication media.
List two career opportunities directly associated with computer networking.
Explain why an intranet is a more secure way to share files within an organisation compared to the Internet.
Students of a school intend to elect their school captain by secret ballot. State three ways in which computers can be used to improve the election process.
Explain two ways in which the use of Internet could make reporting of corruption easier.
Interactiveness:
Explain two ways in which the use of internet could make reporting of corruption easier
(b) Explain two circumstances under which the use of wireless communication would be preferred in data communication.
(c) Figure 2 is an extract of a spreadsheet showing what the students had targeted to score and the actual score in a computer remedial class. 
A performance factor is obtained by subtracting the target score from the actual score and dividing the difference by the target score.
Write a formula that uses cell references only that would be entered in cell: (i) D2 to compute the performance factor. (ii) E2 to display the statement ‘more remedials’ if the performance factor is less than zero, ‘exempted’ if the factor is greater than zero and ‘optional remedials’ if otherwise. (iii) D8 to display the best performance factor.
RESPONSES
(a) Ways ¡n which internet makes reporting of corruption easier.
State three functions of networking operating systems other than providing network security.10/1/2021 State three functions of networking operating systems other than providing network security.
(b) Explain three ways in which an operating system provides data security in a computer system.
(c) Explain three circumstances under which observation method may be preferred during data collection.
(a) Functions of network operating systems
Distinguish between a systems administrator and a database administrator as used in computers.10/1/2021 Distinguish between a systems administrator and a database administrator as used in computers.
Distinguish between systems administrator and database administrator
State two advantages of making payments through a mobile phone.
Advantages of mobile phone in payments
State the role of each of the following data communication devices:repeater and router
(b) Figure 3 shows a network based on the bus topology.
(i) Identify the component labelled P. (ii) State the function of the component labelled P. (c) Students of Neema Secondary School formed an environmental club with a goal of taking part in environmental conservation activities. Outline three ways in which they can use the internet to achieve this goal. (d) (i) A company has three branches A, B and C where A is the headquarter. The local area network (LAN) at A is directly connected to the LAN at B and directly to the LAN at C. Explain two benefits of having the LAN at B also directly connected to the LAN at C. (4 marks) (ii) State three ways in which a company can protect its computer network from hackers.
(a) (i) Repeater
(ii) Terminator in a backbone is used to prevent data signal from bouncing back/absorb signals. (c) Use of internet in environmental conservation club
State three ways in which mobile phones have affected money transactions in the country.
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