JAMB UTME - Computer Studies - 2025

Awọn alaye Idahun

Some keyboard combinations are reserved by the operating system to perform special control actions rather than typing characters. One of the most widely known of these on Windows-based systems is the combination that opens the Security or Task Manager screen, from which a user can choose to restart the computer, and on many older or unresponsive systems pressing it triggers a direct reboot.

Pressing Delete together with only one modifier key, or Ctrl and Alt without Delete, does not trigger this system-level interrupt. It is specifically the three-key combination of Ctrl, Alt, and Delete together that the operating system recognises as the reboot or system-interrupt command, because it was deliberately chosen as a combination unlikely to be pressed by accident during normal typing.

Remember this shortcut as a three-key combination; leaving out any one of the three keys changes its effect completely.

Awọn alaye Idahun

Sending an email from one person to another actually involves several different network protocols working together, each responsible for a different stage of the journey: getting the message from the sender to their mail server, moving it between mail servers, and finally delivering it to the recipient's inbox.

The Simple Mail Transfer Protocol (SMTP) is specifically the protocol used to send and relay email messages, including transferring messages between different email servers as the message moves from the sender's server toward the recipient's server. This server-to-server relay function is exactly what the question is asking about.

POP (Post Office Protocol) is used afterward, by an email client to download messages from the recipient's mail server to a personal device, which is a server-to-client operation, not a server-to-server one. FTP (File Transfer Protocol) is used for transferring files generally, not specifically for email. SNMP (Simple Network Management Protocol) is used for monitoring and managing devices on a network, and has no role in transferring email content at all.

Exam tip: remember that SMTP handles sending and relaying mail (including server-to-server transfer), while POP and IMAP handle retrieving mail for the end user; only SMTP fits a question about communication between email servers.

Awọn alaye Idahun

Before any mechanical or electronic calculating devices existed, people needed a way to keep track of numbers and perform arithmetic. The earliest such device, dating back thousands of years to ancient civilisations, is a manual counting frame consisting of a wooden or metal frame with rods holding movable beads. By sliding these beads into different positions, a user could add, subtract, and perform other simple calculations. Because it was the very first tool humans built specifically to compute, it is recognised as the first computing machine ever invented.

The other options came much later and depended on more advanced design ideas. A device made of two logarithmic scales that slide against each other to multiply and divide numbers was developed in the 17th century, long after the counting frame was already in wide use. A set of rods marked with multiplication tables, used to simplify multiplication and division by manual lookup, was invented in the early 1600s, and a mechanical device using gears to perform addition and subtraction was built shortly afterward, also in the 17th century. All three of these tools represent later refinements in calculating technology, not the original invention.

When a question asks for the "first" computing device, look for the tool with the oldest documented history rather than the most sophisticated mechanism; simplicity and antiquity, not complexity, mark the starting point of computing history.

Awọn alaye Idahun

A security threat is something that a person could exploit to gain access they should not have. Incompatibility between operating systems, outdated software, and physical damage to hardware are all real problems, but they mainly affect whether files can be opened or whether equipment still works; they are not, by themselves, ways for an unauthorised person to break into an account or a file.

Weak passwords used for user accounts and file access are a genuine security threat because a short, common, or easily guessed password can be discovered through guessing or automated cracking tools, letting an unauthorised person log in and view, copy, or delete a user's files. Strong passwords, combined with practices such as not reusing the same password across accounts, directly close off this route of attack.

The exam distinction here is between reliability problems, which affect whether a system works properly, and security threats, which specifically affect whether unauthorised people can gain access; only a weak password falls into the second category among the choices given.

Awọn alaye Idahun

Rebooting a computer can happen in two broad ways depending on whether the operating system directs the restart or the hardware forces it. When the operating system itself initiates the restart, typically by closing running programs, clearing memory, and reloading the system software through a normal shutdown-and-restart command, without the user pressing a physical reset button or cutting the power supply, this is described as a soft reboot. It is called "soft" because it relies on software instructions rather than a hardware-level reset signal.

The term "cold booting" (and the closely related "cold reboot") describes starting a computer from a completely powered-off state, where the hardware has no power at all and must go through its full hardware initialization and diagnostic checks before the operating system even begins to load; this is the opposite of the scenario described, since the machine here is already running and restarts itself without any hardware-based reset. A "hard reboot" specifically refers to a restart triggered by cutting power or pressing a physical reset button, which is precisely the hardware-based reset that the question says did not happen.

The key distinction to hold onto is that "soft" reboots are triggered and controlled by software while the machine stays powered, whereas "cold" and "hard" reboots both involve the hardware being powered down or forcibly reset.

Awọn alaye Idahun

File management operations each do a distinct job: copy duplicates a file while keeping the original in place, move relocates a file from one location to another, and delete removes a file entirely. None of these three combines several separate files into one package.

Compress takes multiple files, or even whole folders, and packages them together into a single archive file, often reducing the overall storage size in the process using compression algorithms. This single archive can then be stored or shared as one unit rather than as many separate files, and later extracted back into its original files when needed. Common archive formats produced this way include ZIP and RAR.

The wording combines multiple files into a single archive is the specific clue that separates compress from copy, move, or delete, since only compression bundles several files together into one.

Awọn alaye Idahun

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.

Awọn alaye Idahun

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.

Awọn alaye Idahun

The hexadecimal number system is a base-16 numbering system, meaning it uses sixteen distinct symbols to represent values. Since the ordinary decimal digits 0 to 9 only provide ten symbols, hexadecimal borrows six letters of the alphabet to represent the remaining values.

Counting upward from 9, the next value (equivalent to decimal 10) is represented by the letter A, decimal 11 by B, decimal 12 by C, decimal 13 by D, decimal 14 by E, and decimal 15 by F. This gives the complete set of sixteen hexadecimal digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F. The sequence therefore runs from 0-9 and A-F, which completes the sixteen required symbols.

A letter such as D or E marks only the fourth or fifth letter in the sequence, not the last one, so stopping there would leave the system with fewer than sixteen symbols. Only F closes the full run from A through F.

Exam tip: remember that hexadecimal always has exactly sixteen symbols, so if you are ever unsure where the letter sequence ends, count six letters starting from A; the sixth letter, F, is always the final hexadecimal digit.

Awọn alaye Idahun

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.

Awọn alaye Idahun

Python enforces a small set of rules for naming variables. A valid name must start with a letter or an underscore, may be followed by any combination of letters, digits, and underscores, and must not contain spaces or symbols such as \(\$\) or a hyphen, since Python would interpret a hyphen as a subtraction operator.

Checking each proposed name against these rules: one name is rejected because it contains the symbol \(\$\), which is not permitted in Python identifiers; another is rejected because a hyphen inside a name would be read as subtraction; and another is rejected because it starts with a digit, which Python does not allow since a name beginning with a number could be confused with a numeric literal. The remaining name uses only letters and an underscore and begins with a letter, satisfying every rule for a valid identifier.

When checking whether a variable name is valid in Python, look first at its first character, since that single check eliminates any name starting with a digit, and then scan the rest for forbidden symbols like \(\$\) or a hyphen.

Awọn alaye Idahun

SSD stands for Solid State Drive. Unlike a traditional hard disk drive, which stores data on a spinning magnetic platter read by a moving mechanical arm, an SSD stores data electronically in flash memory chips with no moving parts.

Because an SSD has no mechanical parts that need to physically move to locate data, it can read and write data much faster than a mechanical hard disk drive, which must wait for the platter to spin to the correct position and the read/write arm to move into place. This makes faster speed the primary advantage of an SSD over a conventional hard disk. SSDs are not primarily valued for larger capacity than hard disks, which typically hold more data at a lower cost per gigabyte, and "Secure Storage Device" and "Simple Storage Disk" are not what the abbreviation stands for.

Examination reminder: SSD should always be expanded correctly as Solid State Drive, and its key advantage over a hard disk drive is speed, arising from the absence of moving mechanical parts.

Awọn alaye Idahun

The storage position of a file isn't one of its numerous characters because, it can be stored either in a primary or secondary memory.

Awọn alaye Idahun

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.

Awọn alaye Idahun

In the BASIC programming language, certain keywords instruct the interpreter on how to treat a line of code, and some lines are meant purely for human readers rather than for execution.

The keyword REM (short for "remark") marks the line that follows it as a comment. When the BASIC interpreter encounters REM at the start of a line, it ignores everything on that line during program execution. Programmers use REM statements to leave explanatory notes inside their code, describing what a section of the program does, without affecting how the program runs.

This distinguishes REM from other statement types. An executable statement is one the interpreter actually carries out, such as an assignment or a PRINT command, and REM is deliberately excluded from execution. It is also not correct to call it simply "un-executable statement", since that phrase does not capture its actual purpose, which is documentation, not merely being skipped. It is not an output statement either, since it produces no visible result on screen.

Whenever a question mentions REM in BASIC, associate it directly with the term comment, since its sole function is to hold explanatory text that the computer ignores.

Awọn alaye Idahun

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.

Awọn alaye Idahun

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).

Awọn alaye Idahun

Charles Babbage designed the Analytical Engine in the nineteenth century as the successor to his earlier Difference Engine. What set the Analytical Engine apart from earlier calculating machines was that it was designed with two separate functional parts: a "mill" that carried out the arithmetic, corresponding to what would later be called a processing unit, and a "store" that held numbers and the results of calculations for later use, corresponding to what would later be called memory.

This separation between a unit that performs calculations and a unit that stores data and intermediate results for reuse is what made the Analytical Engine a genuinely programmable, general-purpose machine rather than a fixed calculator, and it is why historians of computing regard the store, or memory unit, as its key innovation. The Analytical Engine did use punched cards for input, borrowed from the Jacquard loom, but that idea already existed before Babbage applied it to his machine, so it was an adopted feature rather than the engine's own key innovation. It was not steam-powered in practice, and the concept of a distinct central processing unit as a named component came much later in computing history.

Examination reminder: the Analytical Engine's lasting significance in computing history rests on its store, the memory unit that let it retain data and results, marking it as a forerunner of the modern computer.

Awọn alaye Idahun

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.

Awọn alaye Idahun

Several devices sit at the centre of a network, but they differ in what they actually do with the data passing through them. A router directs traffic between separate networks, such as a home network and the wider internet, and a modem converts signals so a network can connect to an internet service provider's line; neither one is primarily built to connect devices within one local network.

A hub also connects devices within a single network, but it is a very basic device: it simply repeats any incoming data out to every connected device, with no awareness of which device the data is actually meant for. A switch does the same central-connection job but manages the traffic intelligently. It reads the address information in each piece of data and sends it only to the specific device it is intended for, which reduces unnecessary traffic and collisions on the network. This targeted management of data traffic is why a switch, not a hub, is described as managing data traffic between connected devices.

When a question stresses that a device manages or directs traffic rather than just connecting devices, that description points to a switch rather than the more basic hub.

Awọn alaye Idahun

This question is testing whether you know the wide range of things computers are used for today, rather than a single narrow technical fact.

Computers are routinely used for entertainment (games, streaming video and music), for accessing and processing information (research, storing records, calculations), and for social media (connecting with people, sharing posts and messages online). Since every one of these listed activities is, in fact, something computers are commonly used for, there is no option among them that correctly names something computers are not used for.

Because entertainment, information, and social media are all genuine, everyday uses of a computer, the only option consistent with the facts is the one that rejects all three as the exception being asked for.

Exam tip: on "which is NOT" questions, always check whether every listed item actually fits the category before picking one, if they all fit, the correct choice is the one that says none of them is the exception.

Awọn alaye Idahun

Computer monitors are classified partly by how many colours they can display.

A monochrome monitor displays images using only one foreground colour against a background, which in practice means the screen shows just two distinct colours, for example black and white, or green and black. This limitation comes from the display technology only being able to represent a pixel as either on or off, with no shades or additional colours in between.

The other options do not fit this description. A colour monitor displays a wide range of colours by combining red, green, and blue light in varying intensities. Colour Graphics Adapter (CGA) was an early IBM display standard capable of showing several colours at once (up to 16 in text mode or 4 on screen simultaneously in graphics mode), which is more than two. "Dichrome monitor" is not a standard recognised term in computer studies; the correct technical term for a two-colour display is monochrome.

When a question describes a display limited to exactly two colours, associate that with the term monochrome, since colour monitors and CGA both support more than two colours at once.

Awọn alaye Idahun

A network for distributing information is any system or arrangement that moves data, files, or resources from one point to another, whether between computers, through email servers, or by sharing a single output device.

Cloud storage distributes files across the internet to be accessed from multiple locations, several computers connected to one printer distribute print jobs to a shared device, and e-mail distributes messages between users across a network. All three genuinely move or share information between separate points.

Microsoft Word does not fit this description: it is a word-processing application used to create and edit documents on a single computer. It does not, by itself, move or share information between different computers or devices, which is why it is the one item that is not a network for distributing information.

When a question asks which item does not belong, check each item against the defining feature stated in the question, here, distribution of information between points, rather than just recognising the terms as computing-related.

Awọn alaye Idahun

Booting is the process of starting up a computer and loading its operating system into memory so that it becomes ready for use. There are two main types, distinguished by the state of the computer immediately before the process begins.

Cold booting happens when a computer is switched on from a completely powered-off state, that is, "turning it on at first instance." During cold booting, the computer runs a full Power-On Self-Test (POST), checks all hardware components, and loads the operating system from scratch.

By contrast, warm booting (sometimes called a restart or soft boot) happens when a computer that is already switched on and running is restarted, usually through a software command such as Restart, without cutting off the power supply. Warm booting skips some of the hardware checks that a cold boot performs because the system was already powered.

Since the question specifically describes turning the computer on for the first time, meaning it was previously off, this matches the definition of cold booting rather than a restart of an already-running machine. "Spicy" and "cool" are not recognised booting terms in computing at all.

Exam tip: link "already on, then restarted" with warm booting, and "off, then switched on" with cold booting.

Awọn alaye Idahun

Different cyberattacks target different weaknesses. Ransomware encrypts a victim's files and demands payment; spoofing disguises the identity of a sender or device to deceive a target; phishing tricks a user into giving up personal information, usually through a fake message or website. None of these three works by directly attacking the code behind a database application.

The attack that specifically exploits weaknesses in an application's software to change data inside a database is SQL injection. It happens when an attacker inserts malicious structured query language (SQL) code into an input field, such as a login box or search bar, that the application then runs against its database without properly checking it first. If the application does not validate or sanitise that input, the injected code can read, alter, or delete data it was never meant to touch.

The key exam distinction is that SQL injection targets the application's own code and its database queries, while phishing and spoofing target the human user, and ransomware targets stored files rather than live database records.

Awọn alaye Idahun

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.

Awọn alaye Idahun

The Central Processing Unit (CPU) is made up of several functional units that each play a distinct role in executing a program, and the question already tells us that the control unit's job is to control the other units, so the answer must be one of the remaining components.

The memory unit is the part of the CPU's supporting structure responsible for holding instructions, data, and intermediate results while a program is running. Before an instruction can be executed, it must be fetched from memory; while calculations are underway, partial results are temporarily stored in memory (often registers) until they are needed again or written to the final output.

The other units serve different purposes. The arithmetic section, along with the logic section, together form the Arithmetic and Logic Unit (ALU), which performs actual calculations and logical comparisons on data, rather than storing it. The control unit, as stated in the question, directs and coordinates the activities of the other units; it does not itself act as the storage location for data and instructions.

When a question asks specifically about "storing" instructions, data, and intermediate results, the keyword storing points directly to the memory unit, since storage is memory's defining function, while the ALU's sections are defined by processing, not storing.

Awọn alaye Idahun

Abbreviations in computing are built from the full name of the component or concept they represent, so the correct expansion must match both the function of the device and the wording actually used in computer science.

CPU stands for Central Processing Unit. It is called "central" because it sits at the core of the computer's operations, coordinating all processing activity, and "processing unit" because its job is to execute instructions and perform calculations.

The other expansions swap in words that sound similar but describe the wrong concept: "control" describes only one internal part of the CPU (the control unit), not the whole component; "computer process unit" and "central personal unit" are not the standard terms used in any textbook or technical reference.

Examination reminder: memorise the exact wording "Central Processing Unit", since abbreviation questions are graded on the precise standard term, not a similar-sounding alternative.

Awọn alaye Idahun

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.

Awọn alaye Idahun

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.

Awọn alaye Idahun

Before assembly languages and high-level programming languages were developed, computers could only be instructed using the language their hardware directly understood: sequences of binary digits, \(0\)s and \(1\)s, representing electrical on/off states in the circuitry. This is known as machine language.

Early programmers had to write and enter these binary instructions directly, often through switches, punched cards, or punched tape, with no translation layer between the human programmer and the hardware. This was extremely tedious and error-prone, which is precisely why easier alternatives such as assembly language (using short mnemonic codes) and later high-level languages were invented, each requiring a translator (assembler, compiler, or interpreter) to convert them down into machine language for the processor to execute.

Assembly language, source code, and object code all came later as improvements built on top of machine language, and each of them still ultimately depends on being translated into machine language before a processor can execute the instructions. This confirms that machine language was the original, most basic form of programming available.

Exam reminder: machine language is the earliest and most fundamental programming language, since it is the only one a processor executes without any translation step.

Awọn alaye Idahun

Access to an information system or network that violates the owner or operator's stated security policy is considered unauthorized access.

Awọn alaye Idahun

A cell reference (such as B4 or A1) points to the value stored in a specific spreadsheet cell instead of typing that value directly into a formula. When a formula uses a cell reference, the spreadsheet always reads the current value in that cell whenever it recalculates.

This matters for accuracy because most spreadsheet errors come from manually retyping the same number into several formulas. If a source figure changes, every formula built from a constant value must be found and edited by hand, and it is easy to miss one or to mistype a digit. A formula built on cell references updates automatically the moment the source cell changes, and the value only ever has to be entered once. This is why cell references improve formula accuracy by reducing how much data has to be typed manually.

A common misconception is that cell references simply make a spreadsheet easier to read. Readability is a side benefit, but the underlying reason examiners test this concept is the reduction in repeated manual entry, which is the direct cause of fewer transcription errors.

Examination reminder: when a question asks for the benefit of a spreadsheet feature, look for the effect on accuracy and maintenance, not just convenience.

Awọn alaye Idahun

A modem converts digital data from a computer into signals that can travel over a communication line, and back again, allowing a computer to connect to a network or the internet. The distinction between the two main types of modem lies in how each one is physically connected to the computer. One type is built as an expansion card, following either of two internal card standards, and is fitted directly inside the computer's case, plugging into a slot on the motherboard so that it draws power and exchanges data internally. The other type is a separate, standalone unit that sits outside the computer case and is traditionally connected to the machine through an external serial port, requiring its own power supply and a cable running to the computer.

The reverse pairing, describing the expansion-card modem as external and the serial-port modem as internal, gets the two types backwards and does not match how each is actually connected. Describing one type as always being a USB device confuses a specific, more modern connection method with the general external type, since traditional external modems used serial ports rather than USB. Stating that both types are expansion cards is also incorrect, since only the internal type plugs directly into the motherboard as a card; the external type is a separate unit rather than a card at all.

The clearest way to remember this distinction is that "internal" modems live inside the computer as expansion cards, while "external" modems sit outside the case and connect through a port.

Awọn alaye Idahun

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.

Awọn alaye Idahun

A Java program is not translated straight from its human-readable source code into machine language. It first passes through a Java compiler, which converts the source code into an intermediate form designed to run on the Java Virtual Machine (JVM) rather than directly on any specific processor. This intermediate form is called byte code.

The Java interpreter, working as part of the JVM, then reads this byte code and translates it, instruction by instruction, into the machine language that the actual computer processor can execute. This two-step process (source code to byte code by the compiler, then byte code to machine language by the interpreter) is what allows the same compiled Java program to run on different types of computers without being rewritten, since only the byte code needs to be produced once. A nibble, a bit, and high level language describe unrelated units or the original source form, not the intermediate form the interpreter actually works from.

Exam takeaway: remember the Java pipeline in order: high-level source code is compiled into byte code, and the interpreter (JVM) then converts that byte code into machine language for execution.

Awọn alaye Idahun

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.

Awọn alaye Idahun

Computer generations are classified according to the core hardware technology used for processing and memory. The earliest generation, spanning roughly from the mid-1940s to the late 1950s, relied on glass vacuum tubes to carry out logic and switching operations, since transistors and integrated circuits had not yet been invented. For main memory, these machines used rotating drums coated with magnetic material, where data was recorded as magnetised spots on the drum's surface and read as it spun past a fixed head, since faster memory technologies like magnetic core memory were not yet widely deployed.

Machines built with transistors instead of vacuum tubes belong to the second generation, a technology that made computers smaller, faster, and more reliable, and that generation typically used magnetic core memory rather than drums. The third generation replaced individual transistors with integrated circuits, packing many transistors onto a single chip, and moved even further away from drum-based memory. The fourth generation is defined by the microprocessor, where an entire central processing unit is built onto a single chip, a technology far removed from vacuum tubes and magnetic drums.

The pairing of "vacuum tubes" with "magnetic drums" is the specific signal to watch for in this type of question, since each generation is tied to one dominant processing technology and one dominant memory technology, and only the earliest generation combines these particular two.

Awọn alaye Idahun

Program development is a step-by-step process: understanding the problem, designing a solution, writing code, and testing it. Each step depends on careful, methodical work, because a mistake made early, such as a misread requirement or a rushed line of code, tends to carry forward and multiply through later stages.

Being stable, steady, and patient keeps a programmer working carefully through each step rather than rushing or skipping checks, which directly reduces the likelihood of making errors such as logic mistakes, typing errors, or missed requirements. A calm, methodical approach also makes it easier to spot a small error before it becomes a bigger problem buried deep in the program.

This is not about avoiding debugging tools or slowing the work down for its own sake; patience is valuable specifically because it prevents the errors that would otherwise need to be found and fixed later, often at greater cost in time.

Awọn alaye Idahun

Computer memory is divided into types based on whether it keeps its contents when the power is switched off. Memory that loses its data when power is removed is called volatile; memory that keeps its data without power is non-volatile.

The description in the question, a permanent memory holding the instructions needed to start the computer and retaining that data even after power off, matches ROM (Read-Only Memory). ROM chips are pre-loaded with the startup instructions the computer needs the moment it is switched on, before an operating system has even loaded from disk.

RAM is the opposite: it is fast, temporary working memory that is erased every time the power goes off, so it cannot be the answer here. The CPU is the processor that executes instructions rather than a storage device, and a network interface card connects a computer to a network, so neither of these stores startup data.

A reliable way to separate ROM from RAM on any exam is to ask: does it survive a power cut? If yes, think ROM; if no, think RAM.