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EXPECTED RESPONSE
A computer diskette in drive A has folders for MEMOS for an administrator. Each of these folders is labelled according to the relevant months. The secretary created the folders for each month’s memo for each of access. Study the table below
A computer diskette in drive A has folders for MEMOS for an administrator. Each of these folders is labelled according to the relevant months. The secretary created the folders for each month’s memo for each of access. Study the table below
(a) Assuming that the secondary was working from the diskette, draw the corresponding tree structure (6mks)
(b) (i) The secretary wanted to create a folder to store a memo in Fraud folder. State the path for that folder. (2mks)
A:/MEMO2/Fraud
(ii) Suggest how the secretary can ensure that the work in that diskette is not spoilt. (1mk)
(iii) The content of the file is not viewed by any other person apart from her. (1mk)
use of password
(c) (i) List any two devices under the control of the operating system. (2mks)
(ii) Explain how each one of these devices are controlled by the OS - Operating System
Input/output devices and ports
In most cases, the operating system controls all data input and information output tasks. Because most input/output devices are slower than the processor, the operating system has to control the flow of data from the time of input to the time the user receives it as information. It ensures that the right data reaches the processor at the right time. The operating system also defines the various input/output ports found on the computer e.g. printer port.
The processor
The processor is a scarce resource. It executes tasks called processes. At any one time several tasks may require processing hence creating competition. The operating system arranges the tasks according to priority and has the ability to stop a particular task to allow the processor to service another one.
Main memory(RAM)
At any one given time so many tasks may require the memory so that they can be accessed and processed by the computer.However,because memory is also a scarce resource,the operating system determines which task will remain in memory awaiting for execution and which one will be sent back to secondary storage to wait. Because the operating system is large and very important, it is usually installed on the hard disk but must be loaded to RAM during the booting process. Not all the operating system can fit in RAM so a small special part that contains the most necessary commands and procedures called the kernel is the one that is loaded.
Secondary storage devices
The operating system manages the storage and retrieval of data on secondary storage devices. It also utilizes the free space on hard disks to enhance the performance of the computer by temporarily holding tasks on it that were in RAM ready for processing but have to wait for sometime.
Communication devices and ports
Communication in this case refers to how the various devices and programs in and out of the computer system send and receive messages from one another and from the processor. The operating system controls the overall communication process between various tasks and computers. External communication can be achieved by connecting an external device to a communication port using a communication medium like cables or even wireless communication.
List four factors to be considered when purchasing an operating system. (2mks)
How does an operating system manage computer memory (2mks)
List three uses of DVDs. (3mks)
Define portability as used in software selection. (1mk)
Portability refers to whether a program can be copied or installed in more than one computer
List four ways of acquiring software in an organization. (2mks)
State the function of the following keys on the computer key board (2mks)(a) Insert
Used to switch between the two typeover modes i.e.
(b) Delete
Delete characters from the cursor position from left to right
State two practices to be observed in order to ensure the safety of the computer user. (2mks)
Differentiate between a line printer and a page printer as used in computers. (2 marks)
A line printer is an impact printer that prints one entire line of text at a time
while a page printer is a non impact printer that prints a Whole page at a timer 
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
State two ways through which a computer user can minimise Repetitive Strain Injuries (RSI) associated with the use of a computer.
A computer technician has observed a lot of dust on computers in the computer laboratory.State three precautions that need to be put in place to avoid this.
Describe each of the following computer cables: Parallel cable and Serial cable;
Description of computer cables
a) Parallel cable
The management of an organisation intends to purchase a printer. State three factors that they should consider during the purchase
Factors to consider when purchasing a printer
State three characteristics of mainframe computers.
Characteristics of mainframe
State three features of fifth generation computers.
Features of fifth generation computers
Explain three ways in which an operating system provides data security in a computer system14/1/2021 Explain three ways in which an operating system provides data security in a computer system
Access control:
(b)State two instances where observation is not a viable method of gathering data during system analysis stage.
I. repeater
I. Identify the component labelled P.
Explain two health issues that could arise from the use of unsuitable computer desk.
(i)Name two devices that may be used for storing data for a long duration.
The C directory of a computer has folders named Form 1, Form 2,Form 3 and Form 4. Each class has students' folders named according to their admission number. The students created their own folder for subjects they are studying based on the table shown below:
(a) A form four student intends to create a folder named proj to store project documents.
State the path for the project folder.
(i) work is not lost in case the hard disk fails;
Headache, back and neck pain may result from the use of computers.
State how each of them can be minimised.
Headache
State the functions of each of the following keys on the computer keyboard:
(a) backspace;
State the hardware technological differences between the second generation and the third generation computers. (2 marks)
the honeywell 200 was an example of 2nd generation computer
State two ways of ensuring proper ventilation in a computer room. (2 marks)
 State the meaning of the term disk defragmentation as used in computers.
(a) generating receipts where carbon copies are required;
(b)an architectural drawing where precision is required; (c) producing document output for a visually impaired person.
(a)Carbon copies - impact printers e.g. dot matrix.
(b)Architectural design - plotter (c)Visual impairment - speakers/brailles 
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