1. State the meaning of each of the following terms as used in computers: 

(a) Data   (1mk) 

Refers to raw facts with little or no meaning to the user 

Data refers to raw, unorganized facts or values that lack context or meaning. 

Refer to raw facts that are not meaningful to the user

(b) Byte (1mk) 

A group of eight bits 

2. List four peripherals devices that may get powered from computer ports (2mks)

• Mouse 
• Keyboard 
• Flash disk 
• Wireless modem 
• External hard disk drive 

3. State three requirements that a computer system must have in order to be used for video conferencing (3mks) 

• Webcam 
• Microphone 
• monitor 
• Speakers 
• Sound card 
• Video card/video graphic adapter/graphics card/GPU 

4. Explain the following terms as used in computer display unit 

(a) Pixel – picture element 

The smallest unit of a digital image or graphic that can be displayed and represented on a digital display device. 

Are dots on the screen that form characters and images

The smallest element of an image on a computer display 

The smallest unit of a digital image or display that can be individually controlled to display a specific color or intensity 

(b) Resolution – the number of pixels in a display screen Alternative:  The number of pixels used to make up a picture

DPI is a resolution measurement used by printers (dots per inch). 

Is the number of distinct pixels in each dimension 

Other display terminologies include:

Colour depth: the number of possible colours used to make a pixel

5. A company purchased computer software. State three reasons why the company should be provided with the software documentation during the purchase (3 mks) 

Give details on how to troubleshoot software errors 

Give details on how to use the software 

It shows the genuineness and authenticity of the software 

If in-house/customized software, it may provide for future modification by computer programmers 

Provides details on how to install the software 

6. State three reasons why computers in operations require reliable power supply (3mks) 

To avoiding losing work in case of blackout 

To avoid damage to computers parts 

7. State two uses of computer simulation in education (2mks) 

experiments which would otherwise not be done in a science can be simulated and shown to students through computer screen 

processes that would take long to occur may be simulated within a shorter time 

Safe Experimentation: Simulations can provide a safe environment for students to experiment with things that would be impractical, expensive, or even dangerous in the real world. For example, students can dissect a virtual frog in biology class or run a simulated business in economics. 

Visualization: Complex concepts can be difficult to grasp from textbooks alone. Simulations can bring these concepts to life with visualizations, animations, and 3D models, making them easier for students to understand. 

Boosting Motivation: Interactive simulations can be more engaging than traditional lectures or textbooks. This can help to improve student motivation and make learning more enjoyable.  

Develop Critical Skills: Many simulations are designed to help students develop critical thinking, problem-solving, and decision-making skills. By working through the simulation, students can learn to analyze information, make choices, and adapt to changing circumstances. 

8. State two database objects that may be used to modify a record in a database (2 marks) 

Query 

Form 

9. Differentiate between menu-driven interface and graphical user interface in respect to operating system 

Menu-driven interface is where a user interacts with the computer by selecting commands from a set of options while graphical user interface is where a user interacts with the computer by use of menus, icons, pointer and windows 

10. State three differences between impact and a non-impact printer (3 marks) 

Impact printers produce a lot of noise while printing whereas non-impact printers prince quietly 

Impact printers can print multiple copies/ carbon copies at a go, while non-impact printer cannot produce carbon copies 

Impact printers are monochrome printers while non-impact printer can print coloured document 

Impact printers can only print one font face while non-impact printer can print all font faces 

11. Explain the circumstances that may lead to use of crop tool in a word processing document.(2mks) 

When some parts of an image  are unwanted 

To resize the image to fit in a specified area 

When there is need to change orientation 

To change the aspect ratio 

12. State three benefits of distributed operating system 

Increased reliability and fault tolerance 

When one of the nodes fails, other nodes continue to work. 

Improved performance due to use of parallel processing where tasks are executed simultaneously on multiple nodes 

Distributed systems can be easily scaled by adding more nodes to the network. 

13. The emergence of COVID-19 pandemic led to many organizations in Kenya to embrace teleworking approach 

a) State the meaning of the term teleworking 

Note that teleworking is also known as telecommuting or remote work refers to a work arrangement in which employees perform their job tasks from home or a location outside the traditional office environment using a computer connected to the workplace network 

b) State two benefits that the organization gained by using this approach 

• reduces travel expenses 
• reduces stress due to commuting inconveniences e.g. traffic jams 
• reduces risk of contracting communicable diseases, e.g. COVID-19 

14. State two advantages of using templates when creating documents in word processing (2 marks) 

It saves time since all steps of creating a document is guided 

Formatting is already done, thus can be used even with those having little knowledge of word processing to produce professionally looking documents 

15. Explain circumstances that may lead to the occurrences of the following errors during data processing : 

(a) Truncation error   (2mks) 

Occurs when a large number is reduced to fit a data type

Arises when real numbers possess a significant fractional part that exceeds the available memory space and is chopped off, leading to the loss of precision. 

(b) Rounding error   (2mks) 

Occurs when a real number with more precision than the system can represent is approximated or rounded to fit within the available precision. 

16. (a) State two common features of the fourth generation programming languages 

The use of English-like words and phrases 

Use of graphical icons .eg drag and drop graphical user interface features 

Examples are Structured Query Language (SQL), 

Have code generators and rich libraries 

Contain the ability to add 3GL-level code to introduce specific system logic into the 4GL program. 

(b) A student was advised to design a program before coding. State four reasons for this advice 

The program design acts a blue print thus providing a roadmap for its implementation 

Through the design process, developers gain a deeper understanding of the project requirements. This clarity helps ensure that the final product meets the needs of the end-users. 

The design will enable the student to find and fix errors early.  Addressing these issues at the design stage is typically less costly and time-consuming than fixing them during or after coding.  

It encourages teamwork/collaboration. It ensures that everyone involved in the project shares a common understanding of the software's structure and functionality. 

To speed up code generation 

A good design allows program modification over time. 

Effective design is crucial for building a system that meets the requirements, is scalable, maintainable, and aligns with the goals of the organization 

(c) In a computer game, a player is required to guess a winning number. If the number guessed is 10, the player is declared a winner and the game ends. If the number guessed is not 10 the player is notified to try again. When the number of trials exceeds 4, the player is notified and the game is terminated. Draw a flowchart to represent the algorithm of this game (9 marks) 

Sub Game()
    Dim i As Integer
    Dim n As Integer

    For i = 1 To 4
        ' Input a number n
        n = InputBox("Enter a number")

        If n = 10 Then
            MsgBox "You are the winner"
            Exit For
        Else
            MsgBox "Continue playing"
        End If

        

        If i = 4 Then
            MsgBox "Number of trials exceeded"
            Exit For
        End If
    Next i

    Stop
End Sub