JAMB UTME - Computer Studies - 2025

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A document reader is an input device built to capture information directly from paper documents and convert it into digital data the computer can process. Different document readers are designed to recognise different kinds of marks and text on a page.

Optical mark readers detect marks, such as shaded boxes on a multiple-choice answer sheet. Optical character recognition readers can interpret both handwritten and printed characters. Optical line readers can scan printed lines of text or barcodes. Because each of these is a genuine, distinct type of data that document readers are built to capture, the complete and accurate answer covers all of them together.

Choosing only marks, only handwritten and printed characters, or only printed lines would each describe just one category of document reader rather than the full range of data types that document readers, as a class of device, are capable of reading.

Examination reminder: when a question lists several genuine sub-types of the same device or concept and then offers "all of the above", check first whether every individual option is factually correct before selecting the combined choice.

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Computer components fall into two broad groups: hardware, the physical parts you can touch, and software, the programs and instructions that run on that hardware.

A joystick, keyboard, and mouse are all physical input devices. You can hold them, plug them in, and they wear out over time like any physical object, which makes them hardware. An operating system, however, is a set of coded instructions (a program) that manages the computer's hardware and lets other programs run. It has no physical form of its own; it exists as data stored on a disk and loaded into memory, which is exactly what defines software.

A common mistake is to think that anything installed on a computer, including drivers or apps, counts as hardware simply because it "belongs" to the machine. The correct distinguishing test is whether the item is a physical object (hardware) or a set of instructions/code (software).

Exam tip: when identifying software among a list, look for the item without physical form: it is written, installed, and run, rather than plugged in or touched.

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Computers are classified by the type of data they process and how they represent that data internally.

A digital computer processes data that is represented in discrete, countable form using the binary number system, meaning every piece of information is ultimately reduced to combinations of two states: 0 and 1 (off and on, or low and high voltage). This binary representation is what allows digital computers to perform precise arithmetic and logical operations reliably.

This contrasts with an analog computer, which processes continuously varying physical quantities such as voltage, temperature, or pressure rather than discrete binary values. A hybrid computer combines both digital and analog processing methods in a single system. A microcomputer is simply a small, low-cost digital computer classified by its physical size, not by whether it uses two states; in fact, a microcomputer is itself a type of digital computer.

When a question specifically mentions operation on 0s and 1s, that is the defining feature of digital, not analog or hybrid, systems.

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the stages of SDLC are executed sequentially in order to ensure it goes accordingly. Also, they must be done sequential to gets results from previous stages to know what to improve in later stages. Also it does not overlap because, a stage must be concluded before another proceeds.

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When information travels across a network, it can pass through many intermediate points where it might be intercepted by someone other than the intended recipient. Protecting the confidentiality of that information during transit is a core concern in computer security.

Encryption addresses this by scrambling a message into an unreadable form using a mathematical algorithm and a key, so that only someone holding the correct decryption key can turn it back into readable content. This ensures the message can travel safely to its destination without being understood by a third party who intercepts it along the way.

Encryption does not filter unwanted spam messages, confirm who originally sent a message, or interpret the meaning of data; those are separate functions handled by spam filters, digital signatures, and application software respectively. Encryption's specific job is protecting the content of a message from unauthorised access during its journey.

Exam takeaway: tie encryption specifically to confidentiality during transmission, not to identifying senders or filtering unwanted content, which are different security functions.

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Computer viruses are malicious programs, and the motives behind creating them are almost always harmful or self-serving in nature. To answer this question correctly, it helps to separate genuine motives for writing a virus from a motive that describes the opposite of what a virus does.

Virus authors have historically been driven by identity theft (stealing personal or financial information), pranks (causing disruption or embarrassment for amusement), and research purposes (studying how malicious code spreads, sometimes for legitimate cybersecurity study or, less legitimately, to test destructive capability). All three of these are documented, real-world reasons people have written viruses.

"Protection" does not fit this list, because a virus is designed to infect, damage, or exploit a system, not to protect it. Software written specifically to protect a computer, such as antivirus software, is the direct opposite of a virus in both purpose and effect.

Examination reminder: when a question asks you to spot the option that does not belong, check whether one choice describes the opposite function of the others rather than a weaker version of the same idea.

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A mouse works by letting the user move a pointer around the screen and select items by clicking, using hand movement across a flat surface. To find the laptop equivalent, look for the built-in component that performs this exact same pointer-control function.

The touchpad is a flat, touch-sensitive panel built into the laptop's body, usually just below the keyboard. Moving a finger across its surface moves the on-screen pointer, and tapping or pressing it performs a click, which is precisely the function a mouse serves on a desktop computer.

Arrow keys can move a text cursor or make menu selections in some programs, but they do not provide the smooth, freeform pointer control that a mouse or touchpad does. A navigation bar is a feature found within software such as a web browser, not a physical laptop component, and a keyboard's main purpose is typing text rather than controlling an on-screen pointer.

Examination reminder: identify the touchpad as the laptop's built-in equivalent of a mouse, since both provide the same style of freeform on-screen pointer control.

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Computer networks are classified by the size of the area they cover. A network confined to a single building, such as one office, one school building, or one home, is called a Local Area Network (LAN). It connects computers and devices that are close together, usually using cables or a local wireless router.

A Campus Area Network (CAN) covers several buildings on one site, larger than a single office. A Metropolitan Area Network (MAN) spans a city, and a Wide Area Network (WAN) spans a country or the entire globe, connecting many separate LANs together, for example the internet. Since the question specifies a network contained inside one office building, the scale matches a LAN, not the larger categories.

Exam takeaway: rank the network types by geographic scale from smallest to largest, LAN, CAN, MAN, WAN, and match the scenario described to the size that fits.

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When a new system is being planned, several types of feasibility study are carried out to decide whether the project should go ahead, and each type asks a different question. Technical feasibility specifically asks whether the proposed solution can actually be built using the hardware, software, skills, and technology that are currently available, or that can realistically be acquired, rather than requiring technology that does not yet exist or is beyond the organisation's reach.

Asking whether a problem can be solved within the user's own environment relates more closely to operational feasibility, which considers whether the solution will fit into existing work practices and be accepted by the people who must use it day to day. Weighing whether the expected benefits are worth the cost of implementation is the concern of economic feasibility, which focuses on cost and return on investment rather than on whether the technology itself exists. Considering whether a solution might cause social problems falls under a social or ethical feasibility assessment, examining the wider impact on people rather than the availability of technical resources.

The word "technical" in technical feasibility is the clue to hold onto: it always points toward questions about available technology, tools, and expertise, not toward cost, user acceptance, or social consequences.

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Programming errors are generally grouped into three categories: syntax errors, runtime errors, and logical errors. Each occurs at a different stage of running a program.

• Syntax errors happen when code breaks the grammar rules of the programming language (for example, a missing bracket or semicolon), and they are caught before the program even runs.
• Runtime errors happen while the program is actually executing, when it is asked to carry out an operation that is impossible or invalid during that execution, such as dividing a number by zero, accessing a file that does not exist, or running out of memory.
• Logical errors occur when a program runs without crashing but produces the wrong result because of a flaw in the reasoning or algorithm used.

Dividing by zero is mathematically undefined, so when a running program attempts it, the system halts that operation and reports the failure while the program is in progress. This mid-execution failure on an impossible task is the defining feature of a runtime error.

Exam tip: if an error happens only when the program is actually running and involves an operation that cannot be completed (like division by zero or a missing file), classify it as a runtime error rather than a syntax or logical error.

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Computers are grouped into size and cost categories such as supercomputers, mainframes, minicomputers, and microcomputers, ranked roughly from largest and most expensive to smallest and cheapest.

A microcomputer is the smallest and least expensive category, built around a single microprocessor chip. This category includes the desktop and laptop computers most people use daily, which are physically compact and affordable compared to larger institutional computers.

The other options do not correctly name this category. Minicomputers are a step above microcomputers in size, power, and cost, historically used by medium-sized organisations for tasks larger than what one desktop machine could handle. "Small computers" and "tablet computers" are not the standard classification terms used in computer studies for this size and cost category; tablets are simply one physical form that microcomputers can take, not the name of the classification itself.

When a question links "small" and "low cost" together as defining features of a computer category, the correct technical term is microcomputer, not the informal phrase "small computer".

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Storage devices in a computer differ in whether they need continuous power to hold data. This difference matters because it determines what happens to stored information when the computer is switched off.

Non-volatile storage retains its data even after power is removed, which is why files saved on a hard disk, solid-state drive, or flash drive are still available the next time the computer is turned on. Volatile storage, such as RAM, behaves the opposite way, losing its contents the moment power is cut.

Sequential storage and direct storage describe how data is accessed, one item after another versus jumping straight to a location, not whether the data survives a power cut. Those terms answer a different question from the one being asked here.

Exam takeaway: link surviving a power loss directly to non-volatile storage, and keep access-method terms like sequential and direct separate from this power-related distinction.

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The question describes a small program written so that it can travel from one computer to another over the internet and run inside another program, typically a web browser, once it arrives. This kind of small, portable program embedded in a web page is called an applet.

An applet is designed to be downloaded automatically along with a web page and executed within the browser, adding interactive features such as animations or calculations to what would otherwise be a static page. Mail refers to messages sent between users, not a program in itself; an algorithm is a step-by-step plan for solving a problem, not something that is transmitted and executed; and data packages are simply chunks of data moved across a network, not executable programs.

Exam takeaway: associate the idea of a program sent from one computer to another across the web to be run there specifically with an applet, since it is defined by being both a program and something that travels and executes remotely inside a browser.

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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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Writing a program rarely produces perfectly working code on the first attempt. The process of locating faults, known as bugs, in the source code and fixing them so the program behaves as intended is called debugging.

Testing is related but distinct: testing is the act of running the program against various inputs to discover whether errors exist, while debugging is the follow-up work of tracing those errors back to their exact location in the code and correcting them. Editing simply means changing text in a file and coding means writing the original program instructions, neither of which specifically refers to locating and fixing faults.

Keep the terms separate: testing reveals that something is wrong, and debugging is the process of finding out why and putting it right.

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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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Word processors, spreadsheets, database programs, graphics tools, and presentation software all share one feature: each is designed to let a user perform a specific, everyday task such as writing documents, calculating figures, storing records, drawing, or building slides. Software written to carry out these end-user tasks is grouped together as application packages.

Utility packages instead perform maintenance tasks such as compression, backup, or disk cleanup rather than direct user tasks. Operating system software manages the computer's hardware and resources and provides the platform on which application packages run; it is not itself a tool for writing, calculating, or presenting.

Exam takeaway: if a list of software items describes what an ordinary user directly works with to produce documents, numbers, images, or slides, it belongs to application packages, not utility or operating system software.

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File extensions identify the format a program uses to save its files, and Microsoft changed the default file format for its Office suite starting with the 2007 version. Before that change, presentation files used a three-letter extension ending in "ppt". From the 2007 version onward, Microsoft switched to a new XML-based format, and the default extension for a presentation file gained an extra letter, becoming a four-letter extension ending in "pptx", where the added "x" signals that the file is stored in the newer XML-based format rather than the older binary format.

The three-letter extension without the added "x" is the correct default only for versions of PowerPoint released before 2007, so it does not match a question specifically asking about 2007 and newer. An extension ending in "pps" was used for a PowerPoint show file that opens directly in slideshow mode rather than in edit mode, which is a different, more specialised file type, not the general default for a saved presentation. The remaining option is not a real Microsoft file extension at all.

When a question specifies "2007 and newer," treat that as a signal to pick the newer XML-based extension with the trailing "x," since Microsoft's file-format naming convention consistently adds an "x" to mark the modern Office Open XML formats (as with .docx and .xlsx as well).

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A keyboard layout describes the arrangement of letters, numbers, and symbols on the keys. The layout adopted as the worldwide standard for English-language keyboards is named after the first six letters that appear on its top-left row of letter keys: Q, W, E, R, T, Y. This layout was designed in the 1870s for early typewriters and has remained the default arrangement on almost every computer, laptop, and phone keyboard sold today.

The alternative layouts named among the choices exist but are not the standard. One is a later redesign intended to reduce finger movement by grouping the most frequently used letters on the home row; it is used by only a small number of typists who deliberately switch to it. Another is the standard layout used mainly in French-speaking countries, named after the first letters on its own top row, and it rearranges several keys compared with the English standard. A layout that simply lists the alphabet in order (A, B, C, D) is not used in any real keyboard because it would be inefficient for touch-typing, since common letter combinations would not be positioned for quick, alternating finger movement.

Remember that "standard" in this context means the default layout shipped on most computers and recognised internationally, and that is the one named after its own first six top-row letters.

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Programming languages exist on a spectrum from those that are close to human language to those that are close to the machine's own binary instructions.

High level languages, such as Python, Java, or BASIC, use vocabulary and grammar structures that resemble English words and everyday mathematical notation, for example words like "IF", "PRINT", or "WHILE". This makes them the languages closest to how humans naturally think and communicate, and it is also what makes them easier to learn, read, and write compared to other language types.

The other options move progressively further from human language and closer to the computer's native form. Machine language consists purely of binary digits (0s and 1s) that the processor executes directly, with no resemblance to human language at all. Assembly language replaces binary codes with short mnemonic codes like ADD or MOV, which is more readable than pure machine code but still tied closely to the specific hardware and far less natural than a high level language. "Low level language" is the general category covering both machine and assembly language, and by definition sits far from human language, not close to it.

When a question asks which language is "closest to human", look for the option built from natural-language-like keywords, since that readability is the defining feature of high level languages.

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Microsoft PowerPoint is designed for creating slide shows made up of text, images, charts, and animations that are displayed to an audience, typically during a talk or lecture. Software built specifically for this purpose is classed as presentation software.

While PowerPoint is one of many productivity tools used in offices and could loosely be called part of general productivity software, that term is too broad and covers word processors and spreadsheets as well; the precise category that names PowerPoint's actual function is presentation software. It has no graphing or gaming purpose of its own.

Exam takeaway: when a question names a specific well-known program, choose the option that states its exact function rather than a broader category that could apply to several different programs.

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Different database models organise how records in separate files relate to one another. A hierarchical database arranges records in a tree with parent and child relationships, and a network database links records through multiple owner-member pointers, both of which use structural links rather than shared data values.

A relational database instead stores data in separate tables and connects them by matching a common field, known as a key field, that appears in more than one table. For example, a student's identification number stored in one table can be matched against the same identification number in another table to bring related records together. This use of a shared key field to join independently stored files is the defining feature of the relational model.

When a question mentions files being linked through a common data element or key field rather than a fixed tree or network structure, that description points to the relational model.

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In a graphical user interface, a window can be temporarily removed from view while the program running inside it keeps executing in the background. The specific action that shrinks a window down to an icon or a taskbar entry, hiding it from the main screen without closing the program or stopping its processes, is called minimizing the window. Once minimized, a user can click the icon or taskbar entry at any time to restore the window exactly as it was left.

The word "hide" is not the technical term used in graphical operating systems for this action; it is simply a general English word, whereas the operating system's actual command for this behaviour is minimize. Multitasking describes the operating system's broader ability to run several programs at the same time, which is the underlying capability that allows a minimized program to keep running, but multitasking itself is not the specific action of hiding a window. Maximizing does the opposite of what is described here: it expands a window to fill the entire screen rather than shrinking it out of view.

A quick way to keep these terms straight is that minimize hides a window (down to the taskbar) while keeping the program alive, maximize enlarges a window to full screen, and multitasking is the general ability of the system to keep multiple programs running regardless of whether their windows are visible.

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Digital images are made up of tiny individual dots, and the quality or sharpness of a printed or displayed image depends on how many of those dots are packed into a given space.

DPI stands for Dots Per Inch. It measures how many individual dots of ink or toner a printer can place within one linear inch of paper. A higher DPI value means more dots are packed into that inch, which produces finer detail and a sharper, smoother-looking image, while a lower DPI produces a coarser, more visibly dotted result. Graphic designers pay close attention to DPI when preparing artwork for print, since an image that looks fine on a screen can appear blurry or pixelated once printed at a low DPI.

A common confusion is mixing up DPI with PPI (pixels per inch), which measures on-screen resolution rather than printed dot density; on an exam, DPI specifically refers to the printing measurement.

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Software is generally divided into system software, which manages the computer's internal hardware and resources (such as the operating system), and application software, which is installed to let the user perform a specific task, such as browsing the internet, writing documents, or editing photos.

Firefox is a web browser: a program a user opens to visit websites and interact with the internet. Since browsing the web is a specific task performed by the user rather than a background function that manages computer hardware, Firefox falls into the category of application software.

It is not system software, because it does not manage hardware resources or provide the platform on which other programs run; the operating system does that. "Application package" and "computer tools" are not the standard classification terms used to distinguish types of software in this context.

Examination reminder: classify any program by asking whether it manages the computer itself (system software) or helps the user perform a specific task (application software); a browser always falls into the second category.

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Most application software is built to specialise in a single kind of task, such as word processing, graphics editing, or database management. However, one particular category is specifically designed to bundle several of these individual tools together into one unified program.

An integrated package combines the functions of multiple general-purpose applications, for example word processing, spreadsheet calculations, database management, and graphics, into a single software product, letting a user switch between these functions without opening separate, unrelated programs. This is precisely what the question describes: a program that "combines the abilities of several general purpose applications."

A graphics package and a database management package are each single-purpose tools focused on one task, drawing/image editing or record management respectively, rather than combining multiple tools together. "Multipurpose application" sounds similar but is not the standard, specific computer studies term for this concept; "integrated package" is the recognised technical name used for software that merges several general-purpose applications into one.

Exam tip: when a question describes software that "combines" or "bundles" multiple general application types together, the specific term being tested is integrated package.

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A logic circuit is an electronic circuit built from logic gates (such as AND, OR, and NOT gates) that combine input signals according to the rules of Boolean logic to produce a specific output. These circuits form the building blocks of a computer's central processing unit.

Because logic circuits evaluate conditions and combine binary inputs to produce decisions and results, they carry out the processing operations of a computer, performing calculations and logical comparisons, and they also help control the sequence in which operations happen based on the outcome of those comparisons. This combination of processing and controlling is exactly what logic circuits are built to do inside a computer's processor.

Interpretation, in the sense of translating instructions into another form, is carried out by software such as an interpreter, not by a hardware logic circuit. Storage is handled by memory components, not logic gates, and security is handled by software and protocols such as firewalls and encryption, not by the basic logic circuitry itself.

Exam reminder: link logic gates and logic circuits directly to processing and control functions within the CPU, since this is the function they are designed to perform.

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Different application programs are built around one core purpose, even though they may offer several secondary features. Identifying that core purpose is the key to this question.

Microsoft Word is a word-processing program, and its central purpose is to let the user type, format, edit, and produce text-based documents such as letters, reports, and essays. Features like spell-check, formatting tools, and templates all exist to support this single main function: creating documents.

Word does not develop other applications, since it is not a programming or software-development tool. It is also not primarily a storage tool, even though it can save files, because saving is a supporting feature rather than its defining purpose. Browsing the internet is the job of a web browser, a completely different category of application.

Examination reminder: when identifying the purpose of well-known software, focus on its primary, defining function rather than any secondary feature it happens to include.

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Application software is any program written to help a user perform a specific task, such as typing documents, drawing graphics, or preparing presentations. Application software runs on top of and depends on another category of software called system software, which manages the computer's hardware and provides the platform on which applications run.

Word processors and drawing tools are clear examples of application software: one lets a user create and edit documents, and the other lets a user create and edit graphics and illustrations. A word-processing program designed for early Apple computers also falls into this same category, since it exists purely to let users type and format text. An operating system, however, is fundamentally different in purpose. It is system software: it manages the computer's memory, processes, files, and hardware devices, and it must be running before any application software can be opened at all. Because it manages the machine itself rather than performing a specific end-user task, it does not belong in the application software group.

A useful test when classifying software is to ask whether the program manages the computer itself (system software) or whether it helps a person accomplish a task using the computer (application software).

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Computers are grouped into generations based on the core technology used to build them, and this technology strongly affected their cost, size, and reliability.

First generation computers were built using vacuum tubes. Vacuum tubes consumed enormous amounts of electrical power, generated a great deal of heat, required constant cooling, and failed frequently, which meant they needed continuous maintenance and replacement parts. All of this made first generation computers extremely expensive to keep running.

Later generations moved to transistors (second generation), integrated circuits (third generation), and microprocessors (fourth generation), each of these advances reduced power consumption, heat output, size, and the frequency of failures, which steadily lowered running costs compared to the vacuum-tube-based first generation machines.

Exam tip: link vacuum tubes directly to the first generation, and remember that their high power use, heat, and failure rate is exactly why running them was so expensive.

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Computer networks are classified by the size of the geographical area they cover. A network confined to one room or building is called a local area network, while a network that spans cities, countries, or even continents needs a different classification.

WAN stands for Wide Area Network, a network that connects computers and smaller networks over a large geographical area, often using telecommunication links, satellites, or leased lines. The internet itself is the largest example of a wide area network.

The other choices are not standard networking terms; they are constructed to sound similar to the correct expansion but do not correspond to any recognised classification used in computer studies.

Exam takeaway: connect the word wide in WAN to geographical coverage, distinguishing it from a LAN, which covers a small, local area such as a single office or campus.

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A word processor is application software designed for creating and handling text documents. Its core functions cover the whole life cycle of a document, from first creating it to producing a final copy.

Users can write new text into a document, go back and edit that text by inserting, deleting, or reformatting words and paragraphs, and then print the finished document onto paper. These are not separate, competing capabilities; they are all standard, everyday functions built into any word processor such as Microsoft Word.

Because writing, editing, and printing are all genuine and commonly used features of a word processor, the complete and accurate answer covers all three rather than singling out just one.

Exam takeaway: when a question lists several correct, non-conflicting capabilities of the same software and one choice claims all of these are true, check whether every listed capability genuinely holds before ruling it out.

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File security refers to the deliberate measures put in place to protect stored data from loss, corruption, or unauthorised access. Genuine file-security methods include restricting access with a password, keeping duplicate copies through backup so data can be recovered if the original is damaged, and running anti-virus software to detect and remove malicious programs that could destroy or steal data.

Hacking is the opposite of a security method. It is the unauthorised act of breaking into a computer system to access, alter, or steal data, which is precisely the threat that passwords, backups, and anti-virus software are designed to guard against. Because it attacks file security rather than protecting it, hacking cannot be classed alongside the other three items.

When a question asks which item does not belong with a set of protective measures, check whether that item is itself a threat rather than a defence; a threat can never be listed as a security method.

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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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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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Internet Explorer is a web browser, a program designed to request, load, and display web pages from the internet or a local network so a user can read and interact with them.

Its core function is to interpret the code of a website, such as HTML, CSS, and related resources, and render that code as a viewable page, including text, images, and links, allowing the user to navigate from one web page to another. This browsing function is what defines a web browser, and it is the purpose Internet Explorer was built for.

Viewing movies, listening to music, and drawing are tasks handled by dedicated media players or graphics programs rather than by the core function of a web browser, even though a browser might sometimes display embedded media on a page, its defining purpose remains displaying web pages.

Exam tip: classify Internet Explorer, and web browsers generally, by their core purpose, viewing and navigating web pages, distinct from specialised media or drawing software.

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Computer software is divided into system software, which manages the computer's own hardware and internal operations, and application software, which is written to help end users carry out specific, real-world information-processing tasks such as typing documents, managing accounts, or analysing data.

The description in the question, "a set of programs that direct computers to perform specific information processing activities for end users," points directly to this second category. Application software exists precisely because ordinary users need programs built for particular jobs: word processors for writing, spreadsheets for calculations, and database systems for record-keeping, all serving the end user's own tasks rather than the computer's internal housekeeping.

System software, by contrast, works mainly behind the scenes to keep the computer running rather than to serve a user's chosen task directly. The operating system is one specific type of system software responsible for managing hardware and resources, and translators (such as compilers and interpreters) convert program code into machine instructions; neither is defined by performing tasks chosen by an end user.

Exam tip: whenever a definition mentions serving "end users" and specific tasks rather than managing the machine itself, the term being tested is application software.

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If the order of operation on two or more files is similar, then the operation will be sequential. Sequential operation means that the files will be processed one after the other in the same order as specified.

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Boolean algebra provides identities that let an expression be simplified into its shortest equivalent form without changing what it represents logically.

Start with the given expression:

\[ A(A+1) + A(B+0) + C.1 \]

Simplify each term using standard Boolean identities:

• The identity \( X + 1 = 1 \) gives \( A + 1 = 1 \), so \( A(A+1) = A \cdot 1 = A \).
• The identity \( X + 0 = X \) gives \( B + 0 = B \), so \( A(B+0) = A \cdot B = A.B \).
• The identity \( X \cdot 1 = X \) gives \( C.1 = C \).

Substituting these simplified terms back gives:

\[ A + A.B + C \]

Next, apply the absorption law, which states that \( A + A.B = A \), since if \(A\) is already true the whole expression is true regardless of \(B\). This reduces the expression to:

\[ A + C \]

This matches the expression built from the sum of \(A\) and \(C\) alone. The other listed expressions either fail to apply the absorption law correctly or retain a term (such as \(B\)) that the simplification actually eliminates.

When simplifying Boolean expressions, always resolve identity laws (\(X+1=1\), \(X+0=X\), \(X.1=X\)) first, then check for absorption patterns like \(A + A.B\) before concluding the simplification is complete.

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In file management, individual files (documents, images, spreadsheets, and so on) are stored inside a container that groups related files together so they can be organised and found easily. This container is called a folder, sometimes also referred to as a directory.

Just as a physical filing cabinet holds many paper folders, each containing several documents, a computer's storage holds many digital folders, each capable of containing numerous files. Grouping many files under one folder name makes it possible to move, copy, or delete an entire set of related files at once, rather than handling each file individually.

A memo and a draft are types of individual documents, not containers for other files, so they do not describe a collection of files. "Files" itself refers to the individual items being grouped, not the group as a whole.

Exam tip: whenever a question describes a collection or grouping of files, the correct organisational unit in file management is the folder.