Question 1

File extensions (configuration): The '.INI' extension usually refers to what kind of file? Identify the traditional Windows text file used for startup settings. Choose the correct file type.

Accepted Answer

Concept An .INI file is a plain-text initialization/configuration file storing settings in key=value sections for applications or the OS. Final Answer Initialization (configuration) file

Question 2

Laser amplification (mechanism): After the first photons are produced in the gain medium, which process amplifies the light to produce a laser beam? Name the fundamental emission process responsible for optical gain. Choose the correct process.

Accepted Answer

Concept A laser amplifies light via stimulated emission, in which an incoming photon induces an excited atom/ion to drop to a lower energy level, emitting a coherent photon in phase and direction with the incident one. With cavity feedback, this yields exponential gain. Common pitfalls Confusing the initial spontaneous emission (seed photons) with the stimulated process that drives amplification. Final Answer Stimulated emission

Question 3

Engineering history: In which decade was the American Institute of Electrical Engineers (AIEE) founded? Give the decade of establishment before its merger into IEEE in 1963. Choose the correct decade.

Accepted Answer

Given data AIEE's founding decade is asked. Concept/Approach The AIEE was founded in 1884 in the United States; in 1963 it merged with the IRE to form IEEE. Step-by-step Founding year 1884 → falls in the 1880s decade. Common pitfalls Mixing the merger year (1963) with the founding decade. Final Answer 1880s

Question 4

CRT television hardware: What are the electromagnetic coils on the neck of a picture tube called? These coils pull the electron beam horizontally and vertically to scan the screen. Choose the correct component name.

Accepted Answer

Given data Neck-mounted coils in a CRT steer the electron beam. Concept/Approach The deflection yoke (horizontal and vertical windings) creates magnetic fields to sweep the beam across the phosphor screen line-by-line and frame-by-frame. Final Answer Deflection yoke

Question 5

Electronic music standard: In which year was MIDI (Musical Instrument Digital Interface) introduced? State the launch year for the industry interoperability standard. Choose the correct year.

Accepted Answer

Concept MIDI was publicly demonstrated and introduced in 1983, enabling electronic instruments and computers to interoperate. Final Answer 1983

Question 6

Television standby power: Many modern TVs draw power even when switched off. This standby power feeds which function(s) inside the set? Choose the best description.

Accepted Answer

Concept Standby power keeps a remote control IR receiver, minimal logic, and a standby SMPS active for instant-on and settings/clock retention. Final Answer Remote-control receiver and standby power supply for instant-on and memory

Question 7

Computing pioneers: Who largely broke the German Enigma codes and proposed the test foundational to AI? Identify the mathematician and codebreaker. Choose the correct person.

Accepted Answer

Concept Alan Turing led key cryptanalytic advances against Enigma and proposed the Turing Test, a seminal idea in artificial intelligence. Final Answer Alan Turing

Question 8

Building electrical services: Large buildings supplied at medium voltage require a substation/mini-sub. What is the main item of equipment contained in such a substation? Choose the correct device.

Accepted Answer

Concept The heart of a building substation is the MV→LV transformer, stepping medium voltage (e.g., 11 kV) down to low voltage (e.g., 400/230 V). Switchgear, protection, and meters accompany it, but the transformer is the central item. Final Answer Step-down distribution transformer (MV to LV)

Question 9

Computer Hardware — Name the Main Circuit Board In a personal computer, what is the standard term for the primary circuit board that hosts the CPU, memory, chipset, and expansion slots?

Accepted Answer

Introduction / Context: The central platform that interconnects a computer’s core components determines performance, expandability, and compatibility. Correct terminology is essential for IT support, PC assembly, and hardware troubleshooting. Given Data / Assumptions: We seek the industry term for the main printed circuit board in a PC. It carries sockets/slots for CPU, RAM, storage interfaces, and I/O. Distractors include generic or irrelevant terms. Concept / Approach: The motherboard (also called mainboard or system board) integrates the chipset, power delivery, firmware (UEFI/BIOS), and buses (PCIe, memory channels). Other listed words are not names for the primary system PCB in standard computer terminology. Step-by-Step Solution: Identify the role: houses CPU, RAM, expansion slots, connectors.Match to the standard hardware term: motherboard.Eliminate terms not used for system PCBs. Verification / Alternative check: PC vendor documentation and service manuals consistently label the main system PCB as the motherboard or mainboard. Why Other Options Are Wrong: Decoder/Highlight/Select: These are functions or interface terms, not the main PCB’s name. Common Pitfalls: Confusing daughtercards (e.g., graphics cards) with the motherboard; daughtercards plug into the motherboard’s expansion slots. Final Answer: Motherboard

Question 10

Digital Communication — Best Tool for Immediate, Real-Time Chat For quick, real-time back-and-forth conversation with a friend over the internet, which tool is most appropriate?

Accepted Answer

Introduction / Context: Different internet communication services suit different needs. When immediacy and synchronous conversation are required, certain tools are better than store-and-forward systems designed for delayed responses or large-group distribution. Given Data / Assumptions: Requirement: immediate, real-time communication (synchronous chat). Audience: a friend (one-to-one or small group). Available options include both synchronous and asynchronous platforms. Concept / Approach: Instant Messaging platforms provide live text exchange with presence indicators, typing notifications, and multimedia sharing, optimised for fast interactions. E-mail is asynchronous, excellent for longer messages and records but not real-time. Usenet is an older distributed discussion system akin to forums, not real-time chat. Mailing lists broadcast messages to subscribers and are also asynchronous, with delays and threading. Step-by-Step Solution: Identify the need: synchronous, immediate back-and-forth.Map to technology that supports presence and instant delivery.Select Instant Messaging as the best fit. Verification / Alternative check: Common consumer and enterprise tools (e.g., modern chat apps) illustrate rapid, continuous conversation in contrast to e-mail or listserv workflows. Why Other Options Are Wrong: E-Mail/Mailing list: Delayed, store-and-forward systems.Usenet: Topic-driven newsgroups with propagation delays and not intended for immediate chat. Common Pitfalls: Using e-mail for urgent chats can lead to missed messages and slower resolution; instant messaging is preferable for time-sensitive coordination. Final Answer: Instant Messaging

Question 11

Computer Brands — Identify the Non-Computer Item Which of the following names does not refer to a personal computer line or computer brand?

Accepted Answer

Introduction / Context: Technology literacy includes recognising brand names and product lines associated with computing versus unrelated categories. This helps avoid confusion when troubleshooting or purchasing hardware. Given Data / Assumptions: Aptiva was an IBM line of personal computers. Macintosh is Apple’s family of personal computers. Acorn was a British computer company known for BBC Micro and ARM roots. Paseo is a product name in another industry. Concept / Approach: Cross-check each name against computing history. Only one option is not a computer line or brand: Paseo is famously a compact car model marketed by Toyota, not a computer. The other three are directly associated with computers and the PC industry. Step-by-Step Solution: Identify computing associations for Aptiva, Macintosh, Acorn.Recognise Paseo as an automotive product name.Select the out-of-domain option. Verification / Alternative check: Historical product catalogs and tech press archives list IBM Aptiva and Apple Macintosh computers, and Acorn’s systems; automotive catalogs list Toyota Paseo as a vehicle, not a PC. Why Other Options Are Wrong: Aptiva/Macintosh/Acorn: All are computing brands or lines. Common Pitfalls: Assuming unfamiliar brands are unrelated to tech; many influential companies (e.g., Acorn) were region-specific yet pivotal in computing history. Final Answer: Paseo

Question 12

Networking Basics — Expand the Acronym ISP In internet connectivity and telecom contexts, what does the acronym ISP stand for?

Accepted Answer

Introduction / Context: Knowing foundational networking acronyms helps users understand contracts, troubleshoot connections, and select appropriate services. ISPs are the organisations that provide access to the global internet for homes and businesses. Given Data / Assumptions: We seek the standard expansion of ISP used worldwide. Distractor expansions use plausible-sounding words but are not the accepted term. Concept / Approach: An Internet Service Provider offers connectivity (broadband, fibre, mobile data), assigns IP addresses, and often supplies DNS resolution, email hosting, and security services. Other phrases listed are not standard industry terms for ISP and may refer to different concepts (e.g., protocols or generic service integration, not the provider entity itself). Step-by-Step Solution: Match acronym letters to the common industry phrase.Confirm that it denotes a company/entity providing internet access.Choose Internet Service Provider. Verification / Alternative check: Contracts, regulator documents, and router setup guides consistently refer to the connectivity company as the ISP (Internet Service Provider). Why Other Options Are Wrong: Internet Survey Period/Integrated Service Provider/Internet Security Protocol: Not the accepted or common expansion of ISP in networking. Common Pitfalls: Confusing a provider (company) with a protocol (technical standard) or with a generic phrase that shares some words but not the accepted meaning. Final Answer: Internet Service Provider

Question 13

History of Computing Hardware — First Demonstration of a Solid-State Integrated Circuit In which decade did engineers first demonstrate a working solid-state integrated circuit (IC), combining multiple electronic components on a single piece of semi…

Accepted Answer

Introduction / Context: Integrated circuits revolutionised electronics by shrinking multiple components into a single semiconductor die, enabling modern computers, phones, and embedded systems. Recognising the milestone decade helps anchor the evolution of microelectronics. Given Data / Assumptions: Question asks for the decade of the first successful demonstration, not mass commercialisation. Focus is on solid-state ICs, succeeding discrete transistor circuits. Concept / Approach: The first working solid-state integrated circuit was demonstrated in the late 1950s. Early breakthroughs included demonstration of an integrated circuit by Jack Kilby at Texas Instruments in 1958, followed by Robert Noyce’s planar process advances at Fairchild in 1959, which paved the way for practical manufacturing in the 1960s. Thus, the correct decade of the initial demonstration is the 1950s. Step-by-Step Solution: Identify the event: first working IC demonstration.Recall the year: late 1950s (e.g., 1958–1959).Map the year to its decade.Select 1950s as the correct answer. Verification / Alternative check: Museum archives and corporate histories consistently cite 1958–1959 demonstrations as the starting point of the IC era, with mass production scaling in the 1960s. Why Other Options Are Wrong: 1960s/1970s/1980s: These decades saw scaling, commercialisation, and microprocessor evolution, but not the first demonstration. Common Pitfalls: Equating commercial availability with first demonstration; the earliest lab prototypes predate widespread manufacturing by a few years. Final Answer: 1950s

Question 14

COMPUTER FUNDAMENTALS — Acronyms in hardware and architecture In basic computing terminology, what does the widely used acronym 'CPU' expand to in full?

Accepted Answer

Introduction / Context: The term CPU appears in every discussion about computers, from buying a laptop to optimizing software. Understanding what CPU stands for helps learners connect the idea of a “computer’s brain” to how instructions are executed and data is processed. Given Data / Assumptions: The acronym in question is CPU. We are choosing the correct English expansion among several distracting options. No numerical calculation is required; this is a core-definition recall item. Concept / Approach: CPU stands for Central Processing Unit. It is the primary component that interprets and executes program instructions. In modern systems it may be a single chip (microprocessor) with multiple cores, each capable of parallel instruction execution. The CPU coordinates with memory (RAM), storage, and input/output devices to run applications and the operating system. Step-by-Step Solution: Identify the role described by the acronym: the unit responsible for processing instructions is the “processing unit.”Because it is the main or core place where processing happens, it is called “central.”Therefore, CPU expands to Central Processing Unit. Verification / Alternative check: Any introductory computer architecture textbook, service manual, or system specification sheet labels the main processor as the CPU, confirming the expansion Central Processing Unit. Why Other Options Are Wrong: Cute People United — joke distractor; unrelated to computing.Commonwealth Press Union — a media organization name, not hardware.Computer Parts of USA — not a standard term or acronym.Central Peripheral Unit — contradicts the meaning of “peripheral,” which is external to the core. Common Pitfalls: Confusing CPU with the entire system unit or with the GPU (graphics processing unit). The CPU handles general-purpose instruction execution, while the GPU is optimized for parallel numeric workloads like graphics and AI. Final Answer: Central Processing Unit

Question 15

COMPUTER NETWORKS — Centralized storage on a LAN What do we call the main computer on a network that stores files and delivers them to other connected computers (clients)?

Accepted Answer

Introduction / Context: Local Area Networks (LANs) often use a centralized machine to store shared resources such as documents, databases, and applications. Recognizing the correct term improves your understanding of client–server architectures. Given Data / Assumptions: The machine stores files centrally. Other computers access these files over the network. We are naming the role, not the hardware component. Concept / Approach: A file server is a networked computer that hosts files and manages shared access, permissions, and sometimes versioning. Users on client machines retrieve, edit, and save data through network protocols (e.g., SMB, NFS). This pattern enables centralized backup, security, and collaboration. Step-by-Step Solution: Identify keywords: “stores the files” and “sent to computers that are networked together.”Match the role to the standard term → file server.Eliminate options that refer to parts (motherboard) or unrelated items (clip art, peripherals). Verification / Alternative check: Operating systems like Windows Server, Linux, and NAS appliances advertise “file server” functionality and provide access control lists and shares. Why Other Options Are Wrong: Clip art — images, not a server type.Motherboard — a hardware board inside a PC, not a network role.Peripheral — external devices (printers, scanners), not a central storage role.Network printer — outputs documents; does not centrally store files for clients. Common Pitfalls: Confusing “server” (a role/function) with a specific OS brand or a single hardware spec; many devices, including NAS boxes, implement file server roles. Final Answer: File server

Question 16

ELECTRONICS — Rectifier topologies How many diodes are used in a single-phase full-wave bridge rectifier circuit?

Accepted Answer

Introduction / Context: Rectifiers convert alternating current (AC) to direct current (DC). The most common full-wave design for single-phase supplies is the bridge rectifier. Knowing its diode count helps when designing power supplies or troubleshooting. Given Data / Assumptions: Topology: single-phase full-wave bridge (Graetz bridge). Goal: full-wave rectification (both half-cycles used). Ideal diodes assumed, no center-tapped transformer. Concept / Approach: A bridge rectifier uses four diodes arranged in a diamond so that for each AC half-cycle two diodes conduct and two are reverse-biased, steering current through the load in the same direction. Step-by-Step Solution: Draw the classic bridge: four diodes form a loop around the load.Positive half-cycle: one upper and one lower opposite diode conduct; load sees forward current.Negative half-cycle: the other pair conducts; current direction through the load remains the same.Thus, exactly 4 diodes are required. Verification / Alternative check: Compare with a center-tapped full-wave rectifier, which uses two diodes but requires a center-tapped transformer. Without a center tap, the bridge uses four diodes to achieve the same full-wave output. Why Other Options Are Wrong: 2 — corresponds to a full-wave rectifier with a center-tapped transformer, not a bridge.3/6/8 — not standard counts for a single-phase bridge (three-phase bridges use six diodes). Common Pitfalls: Confusing diode count between center-tapped and bridge configurations; also forgetting the higher forward drop in a bridge (two diode drops in series each half-cycle). Final Answer: 4

Question 17

INTERNET FUNDAMENTALS — Measuring access speed When people talk about the speed of an internet connection, which unit is typically used to specify data rate?

Accepted Answer

Introduction / Context: Internet service providers and network tools report link speeds in units of data rate. Recognizing the correct unit avoids confusion between memory size, CPU clock rate, and network throughput. Given Data / Assumptions: Older and entry-level links are often described in kilobits per second (Kbps); modern links use Mbps or Gbps. Question asks for the correct kind of unit, not the latest magnitude. We are not distinguishing bits from bytes in the distractors; we simply identify a data-rate unit. Concept / Approach: Network speed is a rate of data transfer, conventionally expressed in bits per second. Common scales: Kbps (10^3 bps), Mbps (10^6 bps), and Gbps (10^9 bps). The stem lists Kbps, which is a valid data-rate unit, unlike RAM (memory capacity), MHz (clock frequency), or Megabytes (storage/size). Step-by-Step Solution: Identify a throughput unit → bits per second family.Among options, Kbps fits (others are capacity or frequency measures).Select Kbps as the correct answer. Verification / Alternative check: Routers, modems, and ISP plans advertise “20 Mbps,” “100 Mbps,” etc. Kbps is the same family and historically common for dial-up or low-bandwidth links. Why Other Options Are Wrong: RAM — random access memory (capacity), not a speed unit.MHz — megahertz measures frequency of a signal or CPU clock.Megabytes — measures data size, not the transfer rate.Frames per second — video/graphics rate, not network throughput. Common Pitfalls: Confusing MB/s (megabytes per second) with Mbps (megabits per second). 1 byte = 8 bits, so 80 Mbps ≈ 10 MB/s. Final Answer: Kbps

Question 18

PC MAINTENANCE — Diagnosing gradual slowdowns Your computer has gradually become slower over weeks or months. Which is the most likely cause among the following options?

Accepted Answer

Introduction / Context: Performance troubleshooting starts with recognizing patterns. A gradual slowdown often indicates a software-related issue rather than catastrophic hardware failure. Understanding common causes enables quick, practical fixes. Given Data / Assumptions: Slowdown is progressive, not a sudden crash. No mention of high temperatures, sudden shutdowns, or error beeps. Consumer Windows PCs are typical targets for adware and unwanted background processes. Concept / Approach: Adware/spyware and other potentially unwanted programs accumulate over time, adding startup entries, browser extensions, telemetry, and background services. These consume CPU cycles, RAM, and disk I/O, leading to sluggish performance. While overheating can cause throttling, it more often produces spikes, shutdowns, or performance drops under load rather than week-by-week degradation. Step-by-Step Solution: Match symptom pattern (gradual slowdown) to likely cause (software bloat/malware).Consider alternatives: aging hardware does not “get slower” purely with time; performance changes stem from software or failing components.Select the most plausible option → adware/spyware infection. Verification / Alternative check: Task Manager or Activity Monitor often shows high background CPU/RAM usage; anti-malware scans detect PUPs; disabling startup entries and cleaning browsers restores speed, confirming the diagnosis. Why Other Options Are Wrong: Overheating — can throttle, but usually correlates with load spikes or clogged fans; still possible but less typically “gradual” in isolation.Processor getting old — silicon age alone does not slowly reduce speed; software and OS changes do.Dropped sandwich — humorous distractor; not a standard cause.“Perfect” wall voltage — irrelevant to slow performance. Common Pitfalls: Ignoring browser extensions and startup apps; neglecting disk health (HDDs fragment or fail). Combine malware scans with disk checks and OS updates for a thorough remedy. Final Answer: Adware/spyware is infecting your PC

Question 19

ELECTRONIC DEVICES — Acronym expansion In semiconductor electronics, what does the acronym 'BJT' stand for?

Accepted Answer

Introduction / Context: Transistors are foundational to analog and digital circuits. The BJT is one of the two cornerstone transistor families, the other being the MOSFET. Knowing the expansion helps you decode datasheets and circuit discussions. Given Data / Assumptions: The acronym to expand is BJT. We are selecting among similarly sounding distractors. No circuit analysis is required; this is terminology. Concept / Approach: BJT expands to Bipolar Junction Transistor. “Bipolar” reflects that both electrons and holes participate in conduction. “Junction” indicates PN junctions (two junctions for a transistor). “Transistor” describes a device that controls a large current with a small input current. Step-by-Step Solution: Recall that BJTs have two PN junctions → emitter–base and base–collector.Because both charge carriers are involved, the device is called bipolar.Therefore, the correct expansion is Bipolar Junction Transistor. Verification / Alternative check: Standard textbooks and datasheets (e.g., for 2N2222, BC547) list device type as “NPN/PNP Bipolar Junction Transistor.” Why Other Options Are Wrong: Bit Junction Transfer/Bell Jar/Back Junction/Binary Junction — invented or incorrect phrases; not used in electronics nomenclature. Common Pitfalls: Confusing BJTs with MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors). MOSFETs are unipolar devices relying mainly on one type of charge carrier. Final Answer: Bipolar Junction Transistor

Question 20

ELECTRONIC DEVICES — Terminals on a BJT How many electrical terminals (external leads) does a standard BJT have?

Accepted Answer

Introduction / Context: A Bipolar Junction Transistor (BJT) is a three-terminal device used for amplification and switching. Correctly identifying its terminals is essential for wiring and biasing in circuits. Given Data / Assumptions: The device class is a standard discrete BJT. We are counting external connection points, not internal junctions. Package style (TO-92, TO-220, SOT-23) does not change the count. Concept / Approach: BJTs have three terminals: the emitter (E), base (B), and collector (C). Current flowing from emitter to collector is controlled by a small base current. Configurations like common-emitter, common-base, and common-collector refer to which terminal is shared between input and output. Step-by-Step Solution: Identify the functional parts: emitter, base, collector.Each corresponds to an external lead.Therefore, a BJT has exactly 3 terminals. Verification / Alternative check: Datasheets label pinouts with E, B, C in various orders depending on package. Circuit symbols also depict three distinct terminals. Why Other Options Are Wrong: 1/2 — would not allow transistor action (need control and output paths).4/5 — extra leads apply to special devices or integrated packages, not a standard BJT. Common Pitfalls: Reversing emitter and collector leads when substituting transistors; always check the datasheet pinout. Final Answer: 3

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