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.
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List four factors to be considered when purchasing an operating system. (2mks)
How does an operating system manage computer memory (2mks)
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
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;
State the meaning of the term disk defragmentation as used in computers.
State the purpose of disk defragmentation.
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
A computer technician found it necessary to disable a firewall when working on a computer system. State two reasons that may have necessitated disabling of the firewall.
When firewall is disabled
List six file manipulation activities that may be carried out using an operating system.
File manipulation activities- creation of files/folders
A) Explain three features of a graphical user interface as used in computers. (6 marks)
B) State the function of each of the following computer keyboard keys:
(i) Caps Lock (1 mark)
(ii) Shift (1 mark) (iii) Home (1 mark)
(i) Function of Caps lock
- It’s a toggle key when ON, the characters typed are in uppercase when OFF, the characters typed are in lower case. (ii) Shift key - Used to enable uppercase letter to be printed when alphanumeric keys are pressed. - Used with other keys to modify behavior/function key. (iii) Home key - Used to take the cursor to the beginning of the line in a word processor. - Evidence of movement of the cursor. C) Using two complement notation, determine the value of the operation 2510 — 2910 (6 marks)
​State three factors to consider when selecting an operating system to install in a computer.7/1/2021 State three factors to consider when selecting an operating system to install in a computer. (3 marks)
 Give two differences between a Graphical User Interface (GUI) and a Commandline Interface.
A computer is idle but the hard disk light is blinking, indicating some activity. State two possible causes of this.
Explain the importance of disk partitioning.
Importance of disk partitioning.
Differentiate between pull-down menu and pop-up menu as used in Graphical User Interface (GUI) operating systems.
Difference between pull-down and pop-up menus
What is meant by disk defragmentation?
(b) State the purpose of disk defragmentation.
Distinguish between real-time operating system and distributed operating system. (3 marks)
 State three Ways in which an operating System Secures a Computer System.
Ways in which an OS secures computer system:
Computer network technicians prefer to use command line based operating system when configuring networks. State three reasons for the preference. (3 marks)
Reasons for the use of command — line interface OS
Identify three hardware considerations to be made before installing an operating system.
A secretary saved a document in a computer. After some time, she could not remember the name and the location of the file. State four file details that are assigned a file by the operating system which can assist in tracing the file.Give two causes of such response.
A secretary saved a document in a computer. After some time, she could not remember the name and the location of the file. State four file details that are assigned a file by the operating system which can assist in tracing the file.
State four functions which are specific to Network Operating Systems.
(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) 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)
A school magazine organizes its works in directories. The directory WP contains the files CATS, EXAMS and ASSIGNMENTS. The directory Sp contains the spreadsheet files and the DB directory contains the database files. The directory PROG is contained in the others directory. The directory WP is contained the PERSONAL directory. Given that the directory student contains directories SP, WP, and OTHERS.
(a) Draw the directory tree structure with C as the root
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