NABTEB GCE 2025 COMPUTER CRAFT ANSWERS (OBJ & ESSAY TYPE B)

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COMPUTER CRAFT (TYPE B)
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COMPUTER CRAFT ANSWERS (TYPE B)

INSTRUCTIONS: ANSWER FIVE QUESTIONS ONLY.

(1ai)
Hardware refers to the physical components of a computer system that can be seen and touched, such as the monitor, keyboard, mouse, CPU, printer, and storage devices.

(1aii)
Software refers to the set of instructions, programs, or applications that tell the computer how to perform specific tasks. It is intangible and includes operating systems, applications, and utility programs.

(1b)
(i) Monitor
(ii) Printer
(iii) Speaker
(iv) Projector

(1c)
(i) Hardware is tangible, while software is intangible.
(ii) Hardware can wear out physically, while software does not wear out but can become outdated or corrupted.
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(2a)
A graphic package is a software application used for creating, editing, and manipulating images, drawings, and visual illustrations.

(2bi)
Presentation packages:
(i) Microsoft PowerPoint
(ii) Google Slides
(iii) LibreOffice Impress

(2bii)
Graphic packages:
(i) CorelDRAW
(ii) Adobe Photoshop
(iii) Adobe Illustrator

(2c)
=Advantages of AutoCAD=
(i) Produces accurate and precise technical drawings.
(ii) Allows easy modification and editing of designs.
(iii) Improves productivity and saves time in drafting.

=Disadvantages of AutoCAD=
(i) It is expensive to purchase and maintain.
(ii) Requires technical skills and training to use efficiently.
(iii) Needs a high-performance computer to run optimally.
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(3a)
Data transmission is the process of sending data or information from one device or location to another through a communication medium such as cables, radio waves, or wireless networks. It involves the movement of digital or analog signals between computers or other electronic devices.

(3bi)
Table: A table in Microsoft Access is a structured collection of related data organized into rows and columns. Each table stores information about a specific subject, such as students, products, or employees. A table is the foundation of a database because it holds the actual data, with each row representing a record and each column representing a field.

(3bii)
Record: A record is a complete set of related data items stored in a single row of a table. It represents one individual entry or instance within the table. For example, in a student table, one record may contain a single student’s name, age, class, and ID number.

(3biii)
Field: A field is a single category of information stored in a column of a table. It defines the type of data that can be stored, such as text, numbers, dates, or currencies. For example, in a staff table, fields may include Name, Department, Salary, or Phone Number.

(3c)
(i) Click on the File tab.
(ii) Select Save As from the menu.
(iii) Choose the location where you want to save the document.
(iv) Type a file name for the document.
(v) Click the Save button.
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(4a)
A computer network is a collection of two or more computers and other devices that are connected together to share resources, such as data, software, and hardware, and to communicate with each other.

(4b)
(i) LAN (Local Area Network)
(ii) WAN (Wide Area Network)
(iii) MAN (Metropolitan Area Network)
(iv) PAN (Personal Area Network)

=EXPLANATION=
(i) LAN (Local Area Network): A network that covers a small geographical area, such as a home, school, or office building. It allows connected devices to share resources like files and printers efficiently.
(ii) WAN (Wide Area Network): A network that covers a large geographical area, often connecting multiple LANs over cities, countries, or continents, usually via the internet or leased communication lines.

(4c)
(i) Resource sharing: Allows multiple users to share hardware devices like printers and software applications.
(ii) Communication: Enables easy and fast communication through emails, messaging, and video calls.
(iii) Data sharing: Makes it easier to share and access files and information among users.
(iv) Cost efficiency: Reduces costs by sharing resources and eliminating the need for duplicate hardware and software.
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(5ai)
Programming is the process of writing instructions in a programming language that a computer can understand and execute to perform specific tasks or solve problems.

(5aii)
Program development is the process of designing, coding, testing, and maintaining a computer program to ensure it performs the required tasks correctly and efficiently.

(5b)
(i) Correctness
(ii) Efficiency
(iii) Readability
(iv) Maintainability

(5c)
(i) Correctness: The program should produce accurate and expected results for all possible inputs. It must solve the intended problem without errors.
(ii) Efficiency: The program should use minimal resources, such as memory and processing time, while performing its tasks. Efficient programs run faster and are less resource-intensive.
(iii) Readability: The program should be written clearly and logically so that other programmers can easily understand the code, making debugging and future modifications easier.
(iv) Maintainability: The program should be easy to modify, update, or enhance after its initial development without introducing new errors. This ensures it remains useful over time.

(5d)
(i) Define the problem to be solved.
(ii) Analyze the problem and plan a solution.
(iii) Design the program using flowcharts or pseudocode.
(iv) Write the program code in a chosen programming language.
(v) Test the program to identify and correct errors (debugging).
(vi) Document the program for future reference and maintenance.
(vii) Maintain and update the program as needed.
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(6a)
Data validation is the process of checking and ensuring that the data entered into a system is accurate, complete, and meets the required format or rules before it is processed or stored.

(6b)
Data verification is the process of checking that the data entered matches the original source or intended values, while data validation ensures that the data meets the required format, type, or constraints before it is accepted by the system.

(6c)
=ADVANTAGES OF MICROWAVE SYSTEM=
(i) High-speed data transmission: Microwaves can carry large amounts of data quickly over long distances.
(ii) Line-of-sight communication: Suitable for remote or difficult-to-reach areas without the need for cables.

=DISADVANTAGES OF MICROWAVE SYSTEM=
(i) Line-of-sight limitation: Microwaves require unobstructed paths between the transmitting and receiving antennas, which can be blocked by buildings or natural obstacles.
(ii) Weather sensitivity: Microwave signals can be affected by rain, fog, or atmospheric conditions, reducing reliability.
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(7i)
Layer: A layer in AutoCAD is a way to organize and manage different types of objects in a drawing. Each layer can have its own color, line type, and visibility, making it easier to edit or hide specific parts of the drawing.

(7ii)
Base point: The base point is a reference point used in AutoCAD as a starting point for moving, copying, rotating, or scaling objects within a drawing.

(7iii)
Cutting edge: The cutting edge refers to the part of a tool or object that removes material or interacts directly with other objects during a drafting or machining process. In AutoCAD, it can also represent the sharp edge or line used in technical drawings to indicate cuts.

(7iv)
Command line: The command line is a text interface in AutoCAD where users can type commands, options, or input values to execute drawing and editing functions.

(7v)
Drawing limit: Drawing limits define the working area or boundary of a drawing in AutoCAD. It sets the maximum extents within which objects are created and displayed.

(7vi)
Mirror: The mirror command in AutoCAD is used to create a reflected copy of selected objects across a specified axis or line, producing a symmetrical image of the original objects.
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