JAMB UTME - Computer Studies - 2025

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Computers are often classified by their physical size, processing power, and intended use. Some categories, such as supercomputers, mini computers, and file servers, are built for large-scale, stationary tasks and are not designed with portability in mind.

A laptop is a compact, battery-powered, foldable computer that integrates the screen, keyboard, and processing hardware into a single lightweight unit that can be closed and carried easily. This design specifically targets users who need to work while travelling or moving between locations, since a laptop can run without a constant power connection and fits into a bag.

Supercomputers are extremely large, powerful machines used for massive scientific or industrial calculations, housed in dedicated facilities rather than carried around. Mini computers are mid-sized systems used for multi-user business processing, and file servers are dedicated machines that store and share files across a network; both are typically fixed in place in an office or data centre rather than being convenient for travel.

Exam tip: when a question emphasises "portable" or "convenient for travel," it is pointing to laptops (or, more broadly, notebook computers), since portability is their defining design feature compared with servers or large-scale computers.

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Computers connected on a network often play different roles, and one common arrangement is for one machine to centrally hold resources that other machines can access.

A server is a computer specifically set up to store and manage resources, such as files, applications, databases, or printers, and to make those resources available to other computers, called clients, that connect to it over a network. This central role, providing hardware, software, or data resources to multiple connected clients, is exactly what defines a server in a network.

The other options describe computers with different roles. A workstation is a powerful computer used by an individual for demanding tasks such as graphic design or engineering work, not for centrally serving other machines. A mainframe is a very large, high-capacity computer used mainly by big organisations for bulk data processing, but its defining feature is raw processing capacity, not specifically serving client requests over a network. A supercomputer is built for extremely fast, large-scale scientific or numerical computation, again not for the client-server resource-sharing role described.

When a question describes a machine acting as a "central repository" that provides resources to "multiple clients" over a network, that specific client-server relationship identifies a server.

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The term "booting" comes from the phrase "pulling yourself up by your bootstraps", describing how a computer, on power-up, must load its own operating system into memory before it can do anything else, without any operating system already running to help it.

Booting therefore refers specifically to the process of starting a computer: the system runs its initial hardware checks, then loads the operating system from storage into memory so that the machine becomes ready for use. This is the meaning that matches the everyday word "starting".

"Restarting" describes shutting down and booting again, which is a related but more specific event than the general act of starting up. "Loading" and "running" are broader terms that can apply to any program, not specifically to the unique process of bringing a computer to life from a powered-off state.

Examination reminder: reserve "booting" for the very first startup sequence of a computer, and use "rebooting" only when specifically describing a restart after the system was already running.

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Programs written by humans in a high-level language (such as Python or Java) are not directly understood by a computer's processor, which can only execute instructions in machine code (binary). A special program called a language translator converts the human-written code into a simpler form the machine can run.

A compiler is one such translator. It takes the entire source program written in a high-level language and translates it, all at once, into machine code (or another lower-level form) that the computer can execute directly. Because it converts the whole program from a complex, human-readable language down into the simple binary instructions the hardware executes, it fits the description of translating a program into a simpler language the computer can run.

An interpreter also translates code but does so line by line as the program runs, rather than producing a complete translated program beforehand; while related, this distinguishes its mode of operation. A processor is the hardware component that executes instructions rather than a translation program itself, and an algorithm is simply a step-by-step procedure for solving a problem, not a translation tool at all.

Exam reminder: compilers and interpreters are both language translators, but a compiler translates the entire program in one pass before execution, which matches the description of converting a full program into a simpler executable form.

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Protecting sensitive data from being read by unauthorised people who should not have access means preventing them from making sense of the content even if they manage to view or copy the file. This is achieved by scrambling the data into an unreadable form that can only be reversed with the correct key.

This technique is encryption. It converts readable data (plaintext) into unreadable data (ciphertext), so that anyone viewing the file without the decryption key sees only meaningless characters. File permissions and file locks control who is allowed to open or edit a file, and passwords control access to a system or account, but none of these stop the content from being read if the underlying protection is bypassed. Encryption protects the data itself, which directly matches the idea of hiding content from prying eyes.

Exam takeaway: separate access control (permissions, locks, passwords, which decide who may open a file) from content protection (encryption, which hides what the file actually contains even if it is opened).

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In three-tier client-server architecture, an application is split into three separate layers: the presentation tier, the application (logic) tier, and the data tier. Each layer has a distinct role and only ever talks to the layer directly above or below it.

The presentation tier is the layer that end users see and interact with directly, it is made up of the screens, forms, buttons and menus that display information and collect input. Since ordinary users never see or touch the underlying business rules or the database, they operate entirely within this presentation layer, entering data and viewing results through it.

The application tier processes business logic behind the scenes, and the data tier stores and retrieves data, but neither is directly accessible to the end user, they are reached only through requests passed on from the presentation tier.

Exam tip: when a question asks which tier the user interacts with, think of it as "the layer you can see on the screen", that is always the presentation tier.

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Different Microsoft Office applications are built for different kinds of tasks: one is optimised for text documents, another for slide-based presentations, and another for working with numbers arranged in rows and columns.

Microsoft Excel is a spreadsheet program, and its primary purpose is to solve problems involving numbers. It organises data into cells arranged in rows and columns, and provides built-in formulas and functions, for example \( \text{SUM} \) and \( \text{AVERAGE} \), that let a user perform calculations, build budgets, analyse data, and create charts from numeric information.

Writing essays is the role of Microsoft Word, and showing a slide presentation is the role of Microsoft PowerPoint, so those choices describe the wrong application entirely. Keeping students updated on Microsoft's latest products is not a function of any Office application; it is not something the software is designed to do.

When identifying the purpose of an Office application, match the type of content it is designed to handle, text, slides, or numbers, to the correct program name.

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Before a storage disk can be used to save files, it must be prepared with a specific physical and logical structure that tells the operating system how to organise data on its surface.

The process that divides a disk into tracks, concentric circular paths, and sectors, small arcs within each track, is called formatting. Formatting also typically sets up a file system, which the operating system then uses to record where each file's data is physically stored on the disk.

"Tracking" is not a standard term for this preparation process, "crashing" describes a system failure, and "allotting" is a general word for assigning something, none of which specifically describe the structured division of a disk's surface into tracks and sectors.

Remember formatting as a two-part idea: it creates the physical tracks-and-sectors layout, and it installs the logical file system the operating system needs to store and retrieve files.

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This question tests the ability to derive a Boolean output expression from a combinational logic circuit built from standard gates.

The circuit contains three inputs: A, B, and C. Two AND gates are present. The first AND gate receives inputs A and B, producing the product AB. The second AND gate receives inputs B and C, producing the product BC. The outputs of both AND gates are then fed into a single OR gate, which combines them to produce the final output.

Applying the rules of Boolean algebra to this arrangement:

• First AND gate output: \( A \cdot B = AB \)
• Second AND gate output: \( B \cdot C = BC \)
• OR gate combines both: \( AB + BC \)

The overall output expression is therefore \( AB + BC \). This is a sum-of-products (SOP) expression, where each AND gate produces a product term and the OR gate sums them.

This expression can also be factored as \( B(A + C) \), showing that the output is HIGH whenever B is HIGH and at least one of A or C is also HIGH. However, the unfactored SOP form AB + BC directly mirrors the gate-level structure of the circuit.

When reading output expressions from logic circuits, trace each path from the inputs through every gate to the final output. AND gates multiply their inputs (product), OR gates add them (sum), and NOT gates invert (complement). The final expression reflects the exact gate arrangement.

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Computer data is measured in units built from the bit, the smallest unit of digital information, which can be either 0 or 1. Larger units are formed by grouping bits together: a byte is made of \(8\) bits, and a nibble is defined as exactly half of a byte.

Since a byte contains \(8\) bits, half of that amount is\[\frac{8}{2} = 4\]bits. A nibble is therefore made up of \(4\) bits, which is enough to represent a single hexadecimal digit, one reason the nibble is a useful unit in computing.

Keep the size chain in mind: \(4\) bits make a nibble, \(8\) bits (two nibbles) make a byte, and multiples of bytes build up to kilobytes, megabytes, and beyond.

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On a graphical computer or phone screen, each installed application is represented visually by a small picture with a label so the user can identify and open it with a tap or click. This small picture is an icon.

A cursor only marks a position on the screen and does not represent an application. The home screen and the app drawer are containers, the areas where icons are arranged and displayed, but it is the icon itself that stands for and represents the individual application. Asking what displays applications on a screen is asking what visual symbol is used for each one, and that symbol is the icon.

Exam takeaway: keep the container (home screen, app drawer) separate from the symbol placed inside it (icon); an application is represented by its icon wherever it appears.

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Many networking terms are abbreviations built from words that describe exactly what the underlying technology does. Breaking the abbreviation into its component words, and checking that the resulting phrase matches a real, standard protocol, is the safest way to answer this kind of question.

TCP stands for Transmission Control Protocol. It is a core internet protocol that governs how data is broken into packets, sent across a network, and reassembled correctly and in order at the destination, with error-checking to make sure no data is lost or corrupted along the way.

"Transmission Communication Protocol" and "Transformation Control Protocol" swap in words that sound similar but are not the accepted expansion of the letters in this abbreviation, and "Transmission Central Pass" does not correspond to any recognised networking term at all.

TCP is frequently mentioned alongside IP as "TCP/IP", the foundational protocol suite of the Internet; remembering that pairing helps confirm "Control" is the correct middle word.

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Logic gates produce an output based on fixed rules applied to their inputs. An AND gate only outputs HIGH when every input is HIGH, a NOT gate simply inverts a single input, and a NOR gate outputs HIGH only when all of its inputs are LOW, the opposite behaviour of what is being described.

The gate that produces a HIGH output whenever at least one of its inputs is HIGH is the OR gate. Its truth table shows that the only way to get a LOW output is for every single input to be LOW at the same time; as soon as one or more inputs become HIGH, the output switches to HIGH.

Remember the OR gate by the phrase "any one is enough": if any single input is HIGH, the output is HIGH.

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Every hardware component connected to a computer, such as a printer, graphics card, or mouse, communicates using its own particular signals and commands. The operating system cannot understand these signals directly, so it needs a piece of system software, called a device driver, written specifically for that hardware device.

A device driver translates the general instructions the operating system sends into the exact commands the specific hardware understands, and it translates the responses from the hardware back into a form the operating system can use. This is what allows the operating system to detect, configure, and control a wide range of different hardware devices without needing to know the internal engineering details of each one. Running application programs is the role of the operating system working together with application software, not the specific role of a device driver, and device drivers do not provide internet security; that function belongs to security software such as firewalls or antivirus programs.

Examination reminder: whenever a question ties a piece of software to controlling or enabling a specific piece of hardware, the expected answer is a device driver.

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Getting online at home or on a mobile device requires a company that provides the actual connection to the wider internet. This is a distinct service from searching for information or securing a connection, so terms describing search or security functions do not fit what ISP identifies.

ISP stands for Internet Service Provider, a company that supplies individuals and organisations with access to the internet, typically through technologies such as fibre, mobile data, or satellite links, often alongside related services like email hosting or a modem or router. Examples in Nigeria include companies that sell data bundles and broadband subscriptions specifically to connect customers to the internet.

A helpful distinction: an Internet Service Provider connects a user to the internet, while a search engine, which some students confuse it with, only helps a user find information once that connection already exists.

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In any positional number system with base \(x\), every digit used in a number must be strictly less than the base itself. A base \(x\) system only has the digits \(0\) through \(x-1\) available, so a digit equal to or greater than the base can never legally appear.

The number \(235_x\) contains the digit \(5\), which means the base must satisfy \(x > 5\), or equivalently \(x \geq 6\). Testing the possible bases given: base \(3\) only allows digits \(0\), \(1\), and \(2\); base \(4\) only allows digits \(0\) to \(3\); and base \(5\) only allows digits \(0\) to \(4\). None of these can contain a digit \(5\), so all three are invalid. Base \(6\) allows digits \(0\) through \(5\), which comfortably accommodates every digit in \(235_x\), making it the only valid choice.

Whenever a number is written with an unknown base and contains a specific digit, the base must always be greater than the largest digit present; use this check first to eliminate impossible bases quickly.

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A computer virus is a malicious program deliberately written to attach itself to files or programs and spread from one computer to another, often without the user's knowledge. Once active, a virus can slow down the system, corrupt or delete files, consume storage and memory, and generally reduce how effectively the computer performs its normal functions.

This matches the description of "a programme that affects the effectiveness of a computer system," because a virus is itself a self-contained, executable program with the specific purpose of interfering with normal computer operation.

A bug, by contrast, is not a standalone program at all; it is an unintentional error or flaw within the code of a legitimate program, caused by a mistake during development rather than by a deliberately written harmful program. Antivirus software does the opposite of what the question describes, since it is designed to detect and remove threats and therefore protects the effectiveness of a system rather than harming it.

Exam tip: distinguish "bug" (an accidental coding error inside a program) from "virus" (a deliberately created harmful program that spreads and damages performance); only the virus fits the description of a programme designed to affect system effectiveness.

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Some logic gates can act as a controllable switch, letting one input signal decide whether a second, changing signal passes through unchanged or gets flipped. Identifying which gate behaves this way means checking its output for both settings of the controlling input.

An XOR gate outputs 1 whenever its two inputs differ and outputs 0 whenever they are the same. If one input is held at 0 while the other input carries a changing digital waveform, the output simply follows that waveform unchanged, because a signal paired with 0 keeps its own value under exclusive-OR. If the control input is instead held at 1, the output becomes the exact opposite of the waveform at every instant, because a signal paired with 1 gets flipped under exclusive-OR. This makes the XOR gate a controllable inverter: unchanged at one control setting, inverted at the other.

The AND and OR gates cannot reproduce this behaviour, since holding one input fixed at either 0 or 1 forces their output to either always follow or always block the other signal, never to invert it. A NAND gate can invert a signal but does not offer this same unchanged-versus-inverted switching behaviour based on a control input in the way XOR does.

Exam takeaway: recognise the exclusive-OR gate as the standard controlled inverter, passing a waveform through untouched with one control level and flipped with the other.

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A processor (CPU) is made up of several internal parts that each play a distinct role in carrying out instructions. Two of its key components are the control unit and the data path, which together perform all the operations the computer needs.

The data path is the part of the processor that contains the actual hardware, circuits such as the arithmetic and logic unit and the registers connected together, needed to perform every operation required by a computer: fetching data, carrying out calculations, and moving results between components. It is essentially the physical execution engine of the processor, containing all the functional hardware needed to carry out instructions.

The controller (control unit) directs and sequences these operations by sending signals telling the data path what to do and when, but it does not itself contain all the hardware that performs the operations; it coordinates rather than executes. Registers are small, fast storage locations within the data path used to briefly hold data during processing, forming only one part of the data path rather than the whole set of operational hardware. Cache is a fast memory layer used to speed up access to frequently used data, but it is a memory component, not the hardware that performs computational operations.

Exam tip: link the data path to "performing operations" (the doing) and the control unit to "directing operations" (the coordinating), since questions often test this distinction.

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Computer networks are classified by the geographical area they cover, ranging from a single person's immediate space to an entire continent.

A Personal Area Network connects devices that are within a very short range of a single user, typically a few metres, such as a phone linked to a wireless headset or a laptop connected to a smartwatch via Bluetooth. Because it covers the smallest possible area and often links just two or a few devices belonging to one person, it is considered the most basic and smallest type of network.

A Metropolitan Area Network spans a city, and a Wide Area Network spans countries or continents (the internet being the largest example), so both of these cover far more ground than a personal network. A Storage Area Network is a specialised network dedicated to connecting storage devices to servers, which makes it more complex in purpose than a basic personal network, even though it is also relatively small in physical scale.

Exam tip: when a question asks for the "most basic" or "smallest" network type, think about scale starting from a single person outward: Personal, Local, Metropolitan, Wide.

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A computer's file system organises stored files not as one flat list, but as a branching, tree-like structure so that related files can be grouped together and easily located.

Directories (also called folders) are the special files that hold this structure together. A directory can contain ordinary files, and it can also contain other directories nested inside it, which is what creates the parent-child, hierarchical layout of a file system. This is why you can navigate from a root directory down through several levels of sub-directories to reach a specific file.

"Descriptors", "modifiers", and "relative files" are not standard terms for the structural containers of a file system. Descriptors typically refer to identifiers used by an operating system to track open files, not the containers that build the folder hierarchy itself.

Examination reminder: picture the file system as an upside-down tree, with the root directory at the top branching into sub-directories, each of which can hold files or further sub-directories.

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Programming languages classify data into different types depending on the kind of value being stored, because each type is stored and processed differently in memory. A string is the data type used to hold text, such as letters, words, and sentences, stored as a sequence of characters.

The other data types listed each hold a different kind of value: a float stores numbers with a decimal point, such as \( 3.14 \); an integer stores whole numbers with no decimal part, such as \( 25 \); and a Boolean stores only one of two logical values, true or false. None of these is designed to hold ordinary written text. Because textual data consists of characters rather than numeric or logical values, it is represented using the string data type.

Examination reminder: match the data type to what the value actually looks like: letters and words point to string, whole numbers to integer, decimal numbers to float, and true/false to Boolean.

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Computer devices are classified as either input devices, which send data or instructions into the computer, or output devices, which present processed results back to the user.

A mouse allows the user to point, click, and select items on the screen, sending positional and click data into the computer, making it an input device. A keyboard lets the user type letters, numbers, and commands into the computer, and a joystick is used to send directional and control signals, typically for gaming or simulation, into the computer. All three of these send data from the user to the machine.

A monitor, on the other hand, is a screen that displays visual results the computer has already processed, such as text, images, or video. Since it presents information to the user rather than sending information into the computer, it is classified as an output device, not an input device.

Exam tip: ask "does this device send data into the computer, or show data that came out of it?" A monitor always shows results, so it belongs with output devices, not the input devices listed alongside it here.

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Not all interactions with computer systems are legitimate. Some activities are deliberately designed to bypass security measures for unauthorised access or harm, and these activities are grouped together under a specific category of wrongdoing.

Cracking refers to breaking into a computer system or bypassing software security, often to steal data, disable protections, or use resources without permission. Because this involves unauthorised, deliberately harmful access, it falls under computer crime, the category covering illegal acts committed using or against computer systems.

Cracking is not a legitimate website service, a form of transcription, which involves converting speech or media into written text, or a data security measure; instead it directly undermines the goals that data security measures are meant to achieve.

Exam takeaway: any activity that breaks security to gain unauthorised access, such as cracking or hacking with malicious intent, belongs under computer crime rather than under legitimate services or protective measures.

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Computers are often classified by size and processing power, ranging from small personal devices to the most powerful machines built for specialised scientific and industrial work.

A supercomputer sits at the very top of this scale. It is designed with an extremely high number of processors working together to perform trillions of calculations per second, making it suitable for tasks such as weather forecasting, nuclear simulations, and complex scientific modelling that require enormous, rapid computational power far beyond what an ordinary computer can provide.

Microcomputers and laptops are personal computers intended for everyday individual use, such as word processing, browsing, and general office work, and while capable, they are far less powerful than supercomputers. A mainframe computer is also large and powerful, mainly used by big organisations for processing large volumes of transactions (such as banking records) reliably, but it is built for high-volume, simultaneous multi-user processing rather than the raw, extreme computational speed that defines a supercomputer.

Exam tip: whenever a question emphasises extremely fast, complex calculations rather than handling many users or transactions, the answer points to a supercomputer, not a mainframe.

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Every device connected to a network needs a unique identifying number so that data sent across the network reaches the correct destination. This identifying number follows a standardised addressing scheme.

IP stands for Internet Protocol, the set of rules that governs how data is addressed and routed between devices on a network such as the internet. An IP address is the specific numerical label assigned to a device under that protocol, allowing other devices to locate and communicate with it.

The other expansions given do not correspond to any real networking term; they are plausible-sounding but incorrect substitutes for protocol, which is the actual technical word that IP represents.

Exam takeaway: remember that IP always expands to Internet Protocol, whether discussing an IP address, IP routing, or related networking concepts.

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Keyboards group keys by the job they do. Letter keys type text, number keys enter digits, and arrow keys move the cursor around a document, but none of these groups is designed to control hardware settings on the computer itself.

A dedicated row of keys, usually placed above the number row and labelled F1 through F12, is built specifically to trigger built-in shortcuts. On laptops in particular, several of these keys are shared with icons for volume up, volume down, mute, and screen brightness, activated either directly or by holding a modifier key such as Fn. This is why the key used to access special functions like volume control or brightness is the function key.

A useful way to remember this: any keyboard action that changes a system setting rather than inserting a character almost always lives on the function-key row.

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Application packages are pre-written programs designed to help users perform specific tasks such as writing documents, managing spreadsheets, organising databases, or creating graphics. Different packages serve different purposes, and their popularity reflects how often ordinary users need that particular task.

Word processing, the creation and formatting of text documents such as letters, reports, and essays, is one of the most common computing tasks performed by students, office workers, and businesses alike. This everyday need makes the word processing package the one most widely used among general computer users.

By comparison, a database package is mainly used for structured record-keeping, a spreadsheet package is mainly used for numerical calculations, and a graphic design package is mainly used for illustration and image editing. These serve narrower, more specialised audiences than everyday text creation.

Exam takeaway: when comparing application packages by how widely they are used, favour the one tied to the most universal, everyday task, which for most computer users is producing text documents.

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A Database Management System (DBMS) is software specifically designed to interact with databases, allowing users and applications to work with the data stored inside them. Its primary purpose extends beyond simply holding data.

A DBMS allows users to create, insert, update, delete, search, and organise records within a database. All of these actions, taken together, are described as the manipulation of data in a database. This is the core function that separates a DBMS from a plain storage device: it does not just hold data passively, it actively provides the tools needed to work with and change that data in a controlled and organised way.

Virus detection and cyber security are functions of dedicated security software, not of a DBMS. Storing large amounts of data is something a DBMS supports as part of its broader role, but simple storage is not its major distinguishing function since many other technologies can store data; the defining feature of a DBMS is the structured manipulation and management of that stored data.

Exam tip: whenever a question asks about the "major function" of a DBMS, focus on data manipulation and management rather than storage alone.

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Building an information system is a complex undertaking that benefits from a structured, repeatable process rather than an ad-hoc approach, which is why organisations follow an established methodology.

The System Development Life Cycle (SDLC) is exactly this: a structured framework describing the stages an information system passes through, typically including planning, analysis, design, implementation, testing, and maintenance. It provides a systematic approach that guides a development team from identifying a business need all the way through to delivering and maintaining a working system.

The other options misidentify what the SDLC actually is. It is not a programming language, since it does not consist of syntax or code used to write programs; instead, it describes the process surrounding development. It is not solely a debugging methodology, since debugging is only one small part of the testing and maintenance stages within the wider cycle. It is also not a hardware configuration protocol, since it addresses the overall development process for an information system, not the technical setup of physical hardware.

When a question describes a "framework" or set of "stages" for building a system, that phrasing points to the SDLC, since it describes the full end-to-end development process rather than any single technical tool or language.

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Operating systems provide a central location where system-wide options, including hardware settings, installed programs, and user accounts, can be viewed and changed. On Windows computers, this central location has traditionally been the Control Panel.

Within the Control Panel, there is a dedicated section for managing user accounts, where an administrator can rename an existing account, change its picture, or adjust its account type. This makes the Control Panel the place from which the name attached to a user account can be changed.

Options like Computer name or a generic Code panel are not the recognised system location for this task, and while some tasks have moved into a newer Settings app on more recent systems, the Control Panel remains the classic answer for where user account settings, including the account name, are managed.

Exam takeaway: associate user account management, including renaming an account, with the Control Panel rather than with settings that only affect the computer's own network name.

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Before a compiled program can run, several separate pieces, such as the program's own compiled code and any library routines or other object modules it depends on, usually need to be combined into a single executable file. This combining process is carried out by a linker.

The linker's job is to link the program with other programs it needs for execution, it resolves references between separate object files and library code, and joins them together so that when the program calls a function defined elsewhere, the correct code is connected to that call.

Placing a program into memory for execution is the job of a loader, relocating a program to run from a specific memory area is a task carried out during loading or relocation rather than linking, and interfacing a program with entities that generate its input data describes an input or output function, not what a linker does, only combining a program with the other program modules it depends on describes the linker's actual role.

Exam tip: keep the linker, which joins separate program modules together before execution, distinct from the loader, which places the finished executable into memory to run.

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Software development follows distinct stages, and each stage has a specific name that describes what activity is being performed on the program.

Once a programmer has a written specification describing what a program should do, the next task is to translate that specification into actual instructions the computer can execute, using a programming language such as Python, Java, or C. This translation process, where human-readable specifications become computer instructions, is called coding.

The other stages are easy to confuse with coding but describe different activities. Debugging happens after code has been written, when the programmer searches for and corrects errors in it. Testing is the stage where the finished program is run against sample data to confirm it behaves as expected. System design happens even earlier than coding, when the overall structure and logic of the solution are planned, often using flowcharts or algorithms, before any instructions are actually written.

Remember the order: design the solution, code it into a language, test it, then debug any faults found. Coding is specifically the step of converting a plan into instructions.

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System software is the category of programs that manage a computer's own hardware and provide the platform on which all other programs run. The clearest example of system software is the operating system.

iOS, Ubuntu, and Chrome OS are all operating systems: they control the computer's or mobile device's hardware, manage memory and storage, and provide the interface through which a user can then install and run application software such as word processors or games. Because their job is to manage the underlying machine rather than to perform a specific user task, they are classified as system software.

They are not computer applications, since applications are installed on top of an operating system to perform specific tasks, not the other way around. "Computer utilities" and "application package" describe narrower categories, such as small maintenance tools or bundled sets of applications, neither of which matches what a full operating system does.

Examination reminder: whenever you see the name of an operating system in a question, classify it as system software, since its role is to manage the device itself rather than to perform an end-user task.

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ENIAC, one of the earliest electronic computers, had to be manually rewired using switches and cables every time a new program needed to run. This made reprogramming extremely slow and labour-intensive.

EDVAC improved on this by introducing the stored-program concept: both the program's instructions and its data were held together in the computer's own memory, so a new program could be loaded and run electronically instead of by physically rewiring the machine. This idea, closely associated with John von Neumann, became the foundation of virtually all modern computer architecture.

Both machines used vacuum tubes, and EDVAC was not dramatically smaller or reliably faster in every case, so those features do not capture what actually set it apart. The defining leap was architectural: moving from a hand-wired machine to one that could store and execute its own instructions from memory.

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Immersive gaming is designed to make the player feel physically present inside a simulated environment, rather than just looking at a screen from the outside. A portable entertainment device is a general term for handheld gadgets and does not by itself create this sense of presence, and a 360 degree panoramic viewer or an augmented reality visor overlay digital content onto or around the real world rather than fully replacing it with a simulated one.

A Virtual Reality (VR) headset is built specifically for this purpose. It covers the user's field of view completely and tracks head movement in real time, so turning your head shifts the view exactly as it would in the real world, creating the illusion of being inside the game's environment rather than watching it on a flat screen. This full replacement of the visual field, combined with motion tracking, is what makes VR the technology associated with immersive gaming.

The key distinguishing idea for the exam is full replacement of the visual field for immersion (virtual reality) versus overlaying digital elements onto the real world (augmented reality); immersive gaming specifically calls for the former.

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A NOR gate is built from an OR gate followed by a NOT (inverter) gate, so its output is always the opposite of what a plain OR gate would produce for the same inputs.

An OR gate outputs 1 as soon as at least one of its inputs is 1, and it outputs 0 only when every input is 0. Because the NOR gate inverts this result, the NOR gate does the reverse: its output is 1 only when every input is 0, and its output becomes 0 as soon as at least one input is 1. This can be shown with the truth table for a two-input NOR gate:

The table shows that the output falls to 0 in every row where at least one input equals 1, which matches the description of the output falling to 0 whenever 1 is present at input.

Exam takeaway: a NOR gate is the exact logical opposite of an OR gate, so wherever OR would output 1 (any input is 1), NOR outputs 0, and wherever OR would output 0 (all inputs are 0), NOR outputs 1.

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In three-tier architecture, each tier has one clearly defined job. The data tier is the layer that stores the actual data and includes the database management system together with the query processing language (such as SQL) used to store, retrieve, and manipulate that data.

The application tier, by contrast, contains the business logic and processing rules, while the presentation tier only displays information to the user. Since the question specifically describes a tier that holds both the database and the query processing language, it is describing the tier responsible for data storage and retrieval, which is the data tier.

A common mix-up is treating the application tier as the place where data is stored, but the application tier only requests data from the data tier through the query language, it does not hold the data itself.

Exam tip: whenever a question mentions a database together with a query language in the same breath, it is pointing to the data tier.

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Software is broadly divided into two major categories based on what it is designed to do: system software, which manages the computer's own hardware and resources (such as the operating system), and application programs, which help the user perform specific tasks such as writing documents, browsing the internet, or editing images.

Application programs are one of the recognised, genuine categories of software, alongside system software. "Replicate programs" and "logical programs" are not standard categories used in computer science; they do not describe an accepted classification of software type.

Because only one of the four listed choices names a real category of software, combining it with a term that is not a real category does not produce a valid answer either.

Examination reminder: when a question lists software types, check that every term named is actually a recognised category before assuming a combined option is correct.

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Printers are classified partly by the material they use to put marks on paper. Inkjet printers spray liquid ink through tiny nozzles, dot matrix printers strike an inked ribbon with pins, and thermal printers use heat on specially coated paper. None of these three uses a fine powder to form the printed image.

A laser jet printer instead uses toner, a fine powder made of pigment and plastic particles. Inside the printer, a laser charges a rotating drum in the pattern of the image, the charged areas attract toner powder, and the powder is then transferred onto the paper and fused permanently in place using heat and pressure. This is why the toner cartridge, not an ink cartridge, is the consumable associated with laser printing.

A quick way to tell printer types apart on paper: if the question mentions toner and a heated fusing process, it is describing a laser jet printer, whereas liquid ink points to an inkjet printer instead.