WAEC Computer Science 2025
Questions & Answers

A student might mistakenly choose options A, B, or C thinking that sophisticated skills or diligent task execution define automation. However, an automatic system is distinguished by its independence, functioning with minimal or absolute absence of human input while depending on pre-arranged instructions to complete operations. Common mistake: Confusing high-level skill capability with operational autonomy.

Candidates might erroneously pick accuracy, completeness, or timeliness because they are vital attributes, making option B seem plausible as a potential distractor. To make sound decisions, useful information relies on being accurate, complete, and timely, whereas market competitiveness does not constitute a standard attribute for decision-making data. Common mistake: Selecting a general business term like competitiveness over core data quality metrics.

One might mistakenly select options A, B, or D—such as mainframe or console—by confusing household appliances with large-scale or entertainment hardware. A specialized microprocessor is integrated directly into machines like washers to govern their internal functions, which is precisely defined as an embedded computer. Common mistake: Assuming every computing device controlled by a chip is classified as a mainframe or general console.

Students might select options B, C, or D by mixing up the hierarchical progression of data processing stages. Raw facts represent the baseline known as data, which becomes transformed into structured information through processing, and the accumulation of such information ultimately builds knowledge. Common mistake: Reversing the hierarchy and claiming knowledge generates data instead of resulting from processed information.

Options A, B, or D might be chosen because assemblers and mnemonics are commonly associated with early programming evolution. Early computing machinery natively understood only binary code, requiring developers to write instructions directly in machine language since hardware architectures cannot process other forms natively without translation layers. Common mistake: Confusing low-level symbolic mnemonics with the pure binary instructions directly executed by early hardware.

A student might incorrectly select bars, a frame, or strings by misidentifying the structural components of the counting tool. Arithmetic calculations such as addition and subtraction are performed by sliding movable beads mounted across rods to represent numerical values. Common mistake: Confusing the supportive outer frame with the actual moving parts used for counting.

Options A, B, or D might look plausible because resetting, circular designs, and folded scales are all recognized methods to handle off-scale issues. Basic flat scales lack advanced adjustment features and cannot correct off-scale readings, whereas resetting, using circular variations, or applying folded scales successfully manage extended ranges. Common mistake: Overlooking the limitation of basic flat scales compared to specialized sliding configurations.

Options A, B, or C might be mistakenly chosen by confusing the CPU's processing or control components with memory storage. Random Access Memory acts as the temporary holding area that preserves data and program instructions for rapid access by the central processing unit during active tasks. Common mistake: Confusing the control unit or arithmetic logic unit with system storage components.

Students could mistakenly select AND, EX-OR, or EX-NOR, assuming standard logic gates share equivalent functional completeness. The NOR gate functions as a universal gate capable of executing any logic operation independently, making its capability equivalent to all other logic gates combined. Common mistake: Confusing standard gating functions with universal gates that can replicate any logical operation.

Options A, B, or C might be chosen if a student misinterprets the architectural block diagrams of a central processing unit. Within standard CPU layout diagrams, the letter Q typically designates a register, which is responsible for holding temporary data values during execution. Common mistake: Confusing internal CPU registers with the broader memory unit or control pathways.

A student might mistakenly choose word processing, spreadsheet applications, or graphic software if they assume all office software functions similarly. Microsoft Access operates as a relational database management system specifically designed for building and organizing structured data repositories. Common mistake: Treating all Microsoft Office programs as generic document or spreadsheet tools.

Options A, B, or C might seem like plausible software functions, but they describe compilers or utility tools rather than hardware-bridging software. Device drivers serve as essential system software that permits the operating system to interface directly with physical components, thereby boosting device functionality. Common mistake: Confusing device drivers with general disk cleanup utilities or language translators.

Candidates might mistakenly pick options A, B, or D by confusing maintenance tools with compilers or hardware drivers. Utility software encompasses specialized antivirus programs designed to scan, detect, and clear out malware to safeguard system integrity. Common mistake: Attributing hardware communication tasks to utility software instead of operating system drivers.

Options A, C, or D might be selected because enhancing boot sequences, providing interfaces, and coordinating apps are all accurate operating system traits. An operating system handles hardware assets like the CPU, memory, and input-output devices with high efficiency, rendering the claim of inefficient management completely false. Common mistake: Accepting negative statements about resource management as true characteristics of system software.

A student might mistakenly pick addition, division, or subtraction due to common misunderstandings of operational hierarchies. Following standard mathematical precedence rules such as PEMDAS or BODMAS, exponentiation holds a higher priority rank than standard addition, subtraction, or division. Common mistake: Violating order of operations by treating exponents with the same priority as basic arithmetic.

Options A, C, or D might be incorrectly selected due to syntax errors involving division slashes or missing operators in programming expressions. Translating the mathematical equation requires utilizing multiplication for adjacent terms, resulting in the correct QBASIC syntax format presented in option B. Common mistake: Omitting the explicit multiplication asterisk between variables and parentheses.

Students might mistakenly select B, C, or D by misinterpreting connector types or directionality rules in logic design. Flowcharts maintain logical sequencing by connecting every individual box using directional arrows that illustrate the precise operational flow. Common mistake: Assuming process flow can enter diagram objects from any random direction without directional indicators.

Options A, B, or D might appear correct if a student misunderstands compiler architecture and target-machine dependencies. Translating source code into an intermediate format makes it much easier to apply code modifications and optimizations that improve overall execution performance without rewriting the base code. Common mistake: Assuming intermediate code exists solely to change compiler target architectures rather than to optimize performance.

Candidates might mistakenly choose domain names, shortcuts, or icons by confusing web navigation elements with desktop files. A hyperlink consists of clickable text or a graphical element that bridges users directly to another file or online resource. Common mistake: Confusing an internet navigation link with a local desktop shortcut or file icon.

Options A, B, or C might be chosen by confusing asynchronous communication methods like email with real-time platforms. Chat rooms facilitate immediate, real-time text exchanges with negligible time lag, unlike slower asynchronous tools like emails or podcasts. Common mistake: Confusing asynchronous messaging services with synchronous real-time chat environments.

A student might select options A, C, or D because strong passwords and antivirus updates are good security habits generally. Phishing specifically depends on malicious links embedded in messages; therefore, avoiding clicks on suspicious emails from unknown senders directly stops credential theft and infections. Common mistake: Relying solely on antivirus software while ignoring suspicious links in unverified emails.

Options A, C, or D might be mistakenly picked by confusing star layouts with ring, linear, or tree network configurations. In a star topology, every individual node links directly to a central hub or switch, which simplifies network management and isolates faults effectively. Common mistake: Confusing centralized hub architectures with linear or node-to-node network structures.

Students might mistakenly choose A, C, or D because predictable words, names, and simple numbers are easy to remember. Strong security passwords require a robust mix of uppercase letters, lowercase letters, numbers, and symbols, making 'P@ssw0rd!' complex and difficult to crack. Common mistake: Choosing simple, memorable personal information or sequential numbers for account passwords.

Options like A or D might seem plausible if you confuse an intranet with a public-facing corporate website. An intranet relies on TCP/IP just like the broader internet, but access is strictly limited to internal organizational users so that secure communication can take place. Common mistake: Confusing a private internal network with public web pages accessible to anyone on the internet.

A student might mistakenly select editing or formatting because these terms also refer to modifying document content and layout prior to release. Reviewing text for spelling, grammar, and factual mistakes ensures absolute accuracy and is specifically known as proofreading before a document is published. Common mistake: Using general terms like editing or formatting interchangeably with the specific error-checking process of proofreading.

Distractors such as files or records might look correct to someone mixing up the fundamental components of a database table. In relational database systems like MS Access, vertical columns represent fields that hold specific attributes of data. Common mistake: Confusing columns (fields) with rows (records).

A test-taker could mistakenly choose a word processor if they associate typing financial figures with standard document creation. Designing budgets relies on numbers, calculations, and formulas, making spreadsheet software the ideal tool because it excels at data organization. Common mistake: Selecting a word processor for numerical tasks that require automated mathematical calculations.

Options like closing the file or creating a new workbook might seem reasonable if a user associates UI buttons with general application lifecycle controls. Pressing the Save icon immediately writes the current workbook to disk so that any recent modifications are safely preserved. Common mistake: Assuming that clicking save will exit the active file instead of retaining changes.

A student might be drawn to option A by misreading it as a tool that accelerates performance rather than slowing it down. An index functions as a specialized lookup structure that rapidly locates records, allowing the database to bypass full table scans and avoid checking every row. Common mistake: Forgetting that database indexes are designed to optimize retrieval speed rather than hinder it.

One might incorrectly select the data bus or system bus since they also handle internal computer communication and transfer signals. The address bus is specifically responsible for carrying memory addresses from the CPU to the RAM, thereby designating exact locations for data access. Common mistake: Confusing the bus that transmits actual data content with the bus that specifies memory locations.

A test-taker could be tempted by options describing active or user-modifiable programs if they fail to remember the unalterable nature of firmware. ROM holds permanent firmware instructions, such as the BIOS, which remain intact and cannot be easily changed. Common mistake: Assuming Read Only Memory holds temporary user data or active running programs.

An unwary student might pick the standard deletion option that sends items to the Recycle Bin. Holding down the Shift key while executing a delete command bypasses the Recycle Bin entirely, permanently removing the target file from the system. Common mistake: Believing that all keyboard-shortcut deletions can be recovered later from the Recycle Bin.

Options suggesting a cold start or background application loading might look plausible if the distinction between boot types is unclear. A warm boot reloads the operating system into memory while the hardware remains powered on, effectively restarting the OS without a full system shutdown. Common mistake: Confusing a warm boot with turning the computer on from a complete power-off state.

A student might mistakenly guess a higher boundary like 128 due to confusing the total count with the maximum numerical index. Standard ASCII utilizes 7 bits to encode a total of 128 distinct characters, spanning a numeric range from 0 to 127. Common mistake: Off-by-one errors when converting total character counts into zero-indexed ranges.

Options like 20GB or 240MB might confuse someone who does not carefully compare storage unit prefixes. Since 1 TB equals 1000 GB, a capacity of 2TB is vastly larger than gigabytes, megabytes, or kilobytes, making it capable of holding the most data. Common mistake: Failing to scale storage units correctly when comparing terabytes to gigabytes.

Options featuring lowercase letters or slightly shifted binary values are common distractors for character encoding questions. Uppercase letter A in the standard ASCII scheme corresponds to the decimal number 65, which translates directly to the binary value 01000001. Common mistake: Confusing the binary codes of uppercase and lowercase alphabet letters.

A candidate might choose static attributes like brand names or stock quantities if they misunderstand how reference files behave. A price list serves as a reference file that undergoes frequent updates to reflect shifting market conditions. Common mistake: Confusing immutable reference data with dynamic records that require constant revision.

A student might select a data structure option by confusing network defense concepts with database optimization tools. A firewall operates as a network security mechanism that builds a defensive barrier to control traffic flow between a trusted internal network and an untrusted external zone like the Internet. Common mistake: Mixing up network security hardware/software barriers with database indexing structures.

Options indicating a damaged file or storage device might seem logical if a user panics at seeing altered file properties. When files on a removable storage device turn into shortcut icons, it typically signals a virus or malware infection attempting to hide original data or propagate itself. Common mistake: Assuming physical media corruption when abnormal icon changes are actually caused by malware.