Name two other input/output devices used at the POS terminal apart from keyboard and barcode reader and give a use for each device.
device: beeper/loud speaker
use: to indicate barcode correctly read/error in reading barcode
device: (LCD) screen/monitor
use: to show prices and other information about goods
device: touch screen
use: to show prices and other information about goods/to select items that need to be
weighed/identified
device: weighing machine
use: to find weight of loose items (e.g. fruit) to enable pricing
device: (magnetic) card reader/CHIP and PIN reader
use: to read customer’s debit/credit card/enable customer to pay for goods using a
credit or debit card
device: printer
use: to print receipts
Describe the principles of operation of laser printers and describe how they are applied in real-life scenarios
Steps
Describe one task that is commonly undertaken during the first phase of system development life cycle
Many organisations provide free public access to a wireless network.
Explain three ethical, legal or data privacy issues that an organisation should be aware of when allowing this access
State three different methods that allow people to communicate using the Internet. In each case, give a different benefit for the stated method.
emails: – fast delivery of messages (to recipient’s mail box)
– able to send attachments
– can store messages for later use
– auto-translation no language problems
– can open email at a convenient time
video conferencing/calling/chat:
– removes need to travel (saves time and money)
– allows face to face discussions
– works in real time (only allow once)
VoIP: – much cheaper than normal international calls
– direct communication between people
– works in real time (only allow once)
chat rooms/instant messaging:
– instantaneous reply
– anyone can join in
social networking:
– can ensure only your “friends” are in communication
– usually free to join and use
– talk to (multiple) friends at the same time
State the characteristics of each of the following network topologies (KCSE COMPUTER STUDIES 2021 )
i) Mesh Topology (2mks)
(ii) Ring Topology (2mks)
State the characteristics of each of the following network topologies (KCSE COMPUTER STUDIES 2021 )
i) Mesh Topology (2mks)
(ii) Ring Topology (2mks)
Maranda 2024 Mock CRE Paper 2
1. a) Based on Deutro-Isaiah, describe the Messiah. (7mks)
The Messiah would be despised/ rejected
The Messiah would be treated harshly/ arrested/sentenced to death
The Messiah would be reconciling people through His suffering
The death of the Messiah would bring forgiveness of sins of humankind
The Messiah would endure suffering/humiliation without complaining/ would suffer innocently
The Messiah would have nothing attractive
The Messiah would be humble/simple
The Messiah would be highly honored
The Messiah would succeed in His work
He would be despised, rejected, wounded oppressed and afflicted
He endured pain and suffering which would have been ours.
Because of our sins he was wounded
We are healed by the punishment he suffered He was treated harshly but he never said a word
He was put in the grave with the wicked
He was buried with the rich even though he did not commit a crime
He took the place of many sinners and prayed that they might be forgiven.
When data is transmitted it is subject to corruption. Explain how a parity check could be used to determine whether corruption has taken place.
What is an Operating System?
Describe why fibre optic cable would be used for the backbone of the network. (2 marks)
Describe how the firewalls can ensure the security of the EmergWA network.
Describe a transmission media that would work better in remote areas
The volunteers assisting in an emergency all wear personal protection equipment (PPE) that has an RFID tag sewn into the collar so that they can be tracked if they become lost in a remote location. Identify what RFID is and outline how it works. (3 marks)
Describe the difference between a barcode and A quick Response code (QR code)
Distinguish between a file and a folder
A file is a collection of related data given a unique name while a folder is named storage location on a storage media that contains related files
What is a backup?
A backup is a copy of data that can be used if the original data is lost.
State a circumstance under which dry-run testing is performed when developing a program (2mks)
What is a utility software?
The following are some of the possible definitions:
It is system software designed to help the users to analyse, configure, optimize, or maintain a computer
System software that helps maintain the proper and smooth functioning of a computer system
Examples include antivirus software, Disk clean-up tools, disk defragmenters, backup software, etc
Explain why a software developer should be responsible for addressing ergonomic issues in software design.
Responsibilities of the software developer is to ensure that the ergonomics focuses on making software user-friendly, reduces repetitive motions or eyestrain and enables movements of users to promote comfort and efficiency.
Software can be designed with adjustable text sizes and screen brightness settings to prevent eye strain, offering users a way to customise their visual experience for better comfort during prolonged use.
Lucy wrote: “I should validate the input into my database by typing in the same data twice”.Why was her statement incorrect?
Computer Studies KCSE 2006 Paper 1
SECTION A (40 MARKS)
1.What is meant by
a)Analogue data
b)Digital data (4 mks)
2. Distinguish between transcription and transposition types of errors and give an example of each (4mks)
3. a)What are peripheral devices? (1mk)
b)Give two examples of peripheral devices (1mk)
4a)What meant by the term user-friendly as used in software development? (1mk)
b)Distinguish between the terms single-tasking and multi-user as used in operating systems (2mks)
5.What actions should be taken in case of a fire outbreak in the computer laboratory? (4mks)
6a) What is an Internet Service Provider? (1mk)
b) An employee in a business company is charged with the responsibility of putting the company advertisements on the Internet.
i) State the professional title of the employee. (1mk)
ii) Give an example of software used by this employee to carry out the above task. (1mk)
7.Differentiate between COM ports and LPT ports (2mks)
8.Explain two ways in which ICT can enhance commerce. (2mks)
9. Explain the following software terms:
a) Portability (1 mk)
b) Modularity (1 mk)
10. a) State two application areas of desktop publishing software. (2mks)
b) Explain the following graphic terms:
i) Rotate (1 mk)
ii) Crop (1mk)
12. a)List two arithmetic operations that can be performed on a row of numeric data in a word processing table. (1 mk)
b) In each case of (a) above, write the expression used. (2mks)
13. List two methods of gathering information during the system development process (2mks)
14.Name three types of optical disks.(3mks)
15.The diagram below shows a formatted plate surface of a storage disk.
Shade and label:
a) one sector ( 1mk)
b) One block (1mk)
SECTION B (60 MKS)
Answer question 16 and any other three questions from this section in the space provided
16 a) List two examples of:
i) Third generation languages (2mks)
ii) Object oriented languages (2 mks)
b) Draw a flowchart to compare three non-equal numeric values A, B, C and prints the largest of the three. (11 mks)
17 a) One of the functions of an operating system is job scheduling. Explain what is meant by job scheduling. (1mk)
b)List and explain three types of user interfaces. (6 mks)
c)Describe the following categories of software:
i) Firmware (1mk)
ii) Proprietary software (1mk)
d) a new company XYZ intends to go into the business of desktop publishing. Advise the company on three computer hardware system specification features to consider as a measure of enhancing performance. (6 mks)
18. a) distinguish between the following sets of terms as used in spreadsheets. (2mks)
i)Worksheet and workbook
ii) Filtering and sorting
b) State one way in which a user may reverse the last action taken in a spreadsheet package. (1 mk)
c)The following is a sample of a payroll. The worksheet row and column headings are marked 1, 2, 3, . and A, B, C. respectively
What precautions would you take in a computer room in case a user complains of backache after long periods of using the computer?
Ergonomic Chair: Ensure that each user has an ergonomic chair that provides proper lumbar support. The chair should be adjustable in terms of height and backrest angle.
Adjustable Desk: Provide adjustable desks or workstations that can accommodate different user heights and allow for proper positioning of the keyboard, mouse, and monitor.
Monitor Placement: Ensure that the computer monitors are positioned at eye level or slightly below to prevent users from straining their necks and shoulders. Consider using monitor stands or adjustable monitor arms for better positioning.
Keyboard and Mouse: Encourage the use of ergonomic keyboards and mice that are designed to minimize strain on the wrists and hands. Provide wrist rests if needed.
Proper Lighting: Ensure that the computer room is well-lit, with appropriate lighting levels to reduce eye strain. Avoid glare on the computer screens by using adjustable blinds or curtains.
Regular Breaks: Encourage users to take regular breaks from prolonged computer use. Suggest the 20-20-20 rule: Every 20 minutes, look away from the screen at an object 20 feet away for at least 20 seconds.
Stretching Exercises: Promote stretching exercises for the neck, shoulders, and back to help alleviate muscle tension and improve blood circulation. Display posters or provide resources on desk stretches and exercises.
Correct Posture: Educate users about proper sitting posture, emphasizing the importance of maintaining a neutral spine position. Provide visual aids or ergonomic training materials to demonstrate the correct posture.
Desk Organization: Encourage users to keep their workstations organized to minimize the need for reaching or straining. This includes keeping frequently used items within easy reach and arranging cables to prevent trip hazards.
Individual Assessments: If the backache issue persists, consider offering individual ergonomic assessments for users. A specialist can evaluate the user's workstation setup and suggest personalized recommendations.
a) What is an operating system? (1 mark)
b) Briefly explain any four functions of an operating system. (8 marks)
c) Describe each of the following data processing methods: [6 marks]
a) What is an operating system? (1 mark)
b) Briefly explain any four functions of an operating system. (8 marks)
Interrupt handling - When an interrupt occurs, the current state of the CPU is saved & the OS handles the request, after which the OS restores the previous state of the CPU & resumes the interrupted process.
Process scheduling - OS decides which process runs next & for how long.
Memory management - Ensures that each process has enough memory allocated to execute without interfering with other processes.
Error handling - OS provides a mechanism to detect & respond to errors such as segmentation faults, hardware failures, or invalid instructions.