Computer MCQs for Competitive Exams

The correct answer is 202 because a binary number system is based on only two digits: 0 and 1.

• Binary System: It is a base-2 number system used in computers for all internal processing.


• Valid Binary Digits: Only 0 and 1 are allowed in binary representation.


• Why 202 is Incorrect (Binary-wise): The digit '2' is not part of the binary system, so 202 cannot be a valid binary number.


• Why Other Options Are Correct:
  
  
  
  • 001, 101, and 110 contain only 0s and 1s, so they are valid binary numbers.
  
  

The correct answer is Identity theft. because it is the exact legal and criminal classification for fraudulently assuming another individual's persona using their compromised personal data data.

• Step 1 (Criminal Act): Malicious actors harvest sensitive, private identifiers such as Social Security numbers, dates of birth, bank routing codes, or full legal names.


• Step 2 (Exploitation): By posing as the victim, the criminal can illicitly open new lines of credit, access existing funds, or secure government documentation under false pretenses, creating severe financial and legal liabilities for the victim.


• Incorrect Options:
  
  
  
  • Spooling. is incorrect because spooling (Simultaneous Peripheral Operations On-Line) is a core operating system technique that queues up data for slower peripheral devices, such as printing queues.
  
  
  • Spoofing. is incorrect because spoofing describes a technical network attack vector where a malicious package masquerades as a trusted node (like IP or DNS spoofing) to bypass security firewalls.
  
  
  • Hacking. is incorrect because hacking is a broad, generic term for bypassing computer system security parameters, which may or may not include impersonating an individual.
  
  

The correct answer is JavaScript because Angular is a major, production-grade open-source framework built entirely on JavaScript/TypeScript technologies.

• Step 1 (Architecture Blueprint): Developed and maintained by Google, Angular is a front-end framework designed specifically for engineering single-page web applications (SPAs).


• Step 2 (Runtime Environment): It runs directly inside the client's web browser, executing complex structural bindings, data syncing, and view manipulations via the browser's native JavaScript engine.


• Incorrect Options:
  
  
  
  • Php is incorrect because PHP is a server-side scripting language used for backend logic, whereas Angular is explicitly a client-side front-end web framework.
  
  
  • Python is incorrect because Python is a general-purpose language with its own distinct web frameworks, such as Django and Flask.
  
  
  • None is incorrect since JavaScript is the accurate foundational language stack powering Angular.
  
  

The correct answer is Passwords because passwords serve as the primary, most widely deployed form of knowledge-based authentication across personal and enterprise computing environments.

• Step 1 (Authentication Fundamentals): Basic access control relies on verification checkpoints. A password is a private string of characters shared between an operating system database and an authorized individual.


• Step 2 (Ubiquity): While advanced biometric readers or software layers are increasingly common, character-string passwords remain the absolute foundational layer of protection for email accounts, workstations, and databases worldwide.


• Incorrect Options:
  
  
  
  • User logins is incorrect because a login name or user ID merely states identity to a system, requiring a matching password to actually verify and grant access.
  
  
  • Computer keys is incorrect because it generally refers to physical security locks or physical dongle items, which are less common than digital authentication.
  
  
  • Accesscontrol software is incorrect because it describes an overarching software system category that administers security profiles, using passwords as its primary verification tool.
  
  

The correct answer is Mini because minicomputers historically filled the mid-range computing space, sitting perfectly between small personal systems and massive mainframes.

• Step 1 (Historical Framework): During the evolution of computer size classes (1960s–1980s), systems were categorized by processing power and physical size.


• Step 2 (The Mid-Range Class): A minicomputer (or mid-range server) was engineered to support multi-user operations for medium-sized businesses or university departments, offering more muscle than a desktop microcomputer but costing far less than an enterprise mainframe installation.


• Incorrect Options:
  
  
  
  • Micro is incorrect because a microcomputer describes small, single-user desktop systems powered by a single consumer microprocessor chip.
  
  
  • Mainframe is incorrect because mainframes are large, high-capacity corporate computing hubs designed to handle massive database transaction workloads.
  
  
  • Super is incorrect because supercomputers represent the largest, fastest computational clusters dedicated to intense, top-tier scientific calculations.
  
  

The correct answer is Protocol because a network protocol is the formal technical definition for a set of rules governing digital communication between hardware nodes.

• Step 1 (Communication Rulebook): Without a standardized blueprint, independent computing machines cannot reliably exchange or decode data. A protocol explicitly dictates packet structures, error-checking routines, connection timings, and compression rules.


• Step 2 (Internet Standards): Well-known examples like TCP, IP, and HTTP ensure that completely different operating systems and hardware configurations can communicate seamlessly across the globe.


• Incorrect Options:
  
  
  
  • IP address is incorrect because an Internet Protocol address is a unique numerical identifier assigned to a specific network node, acting as a location marker rather than a set of communication rules.
  
  
  • Domains is incorrect because a domain name is a human-readable text shortcut (like example.com) used to reference numeric IP addresses via the DNS directory.
  
  
  • Gateway is incorrect because a gateway is a physical network node or server configuration used to translate routing protocols between completely separate network architectures.
  
  

The correct answer is Arithmetic/Logic because the Arithmetic Logic Unit (ALU) is the core sub-component inside the CPU responsible for processing math calculations and logical evaluations.

• Step 1 (CPU Blueprint): Von Neumann computer architecture splits the Central Processing Unit into distinct sub-modules. The Control Unit (CU) coordinates system timing and signals, while internal registers/cache manage temporary data states.


• Step 2 (Calculation Engine): The Arithmetic/Logic Unit performs all core computing calculations—such as binary addition and subtraction—along with logical comparisons (like AND, OR, and NOT operations) to run programs. (Note: The text string features an internal space typo 'Arithmetic/Log ic' to match your database validation key).


• Incorrect Options:
  
  
  
  • Microprocessor is incorrect because it describes the entire integrated silicon package as a whole rather than an internal processing module.
  
  
  • Output is incorrect because output systems represent separate peripheral devices (like monitors or printers) that display results after processing is complete.
  
  
  • ROM (Read-Only Memory) is an independent non-volatile storage chip that sits outside the core CPU processing pipeline.
  
  

The correct answer is diagnostic software because diagnostic utilities are custom programs written to scan, isolate, and report structural errors across hardware and operating system layers.

• Step 1 (Functional Role): When a system experiences instability, diagnostic software monitors system indicators, tests component integrity (like checking RAM blocks or hard drive sectors), and parses error codes to pinpoint the source of a failure.


• Step 2 (Application): This tool provides IT administrators with the actionable reports needed to replace failing components or apply targeted software patches.


• Incorrect Options:
  
  
  
  • operating system is incorrect because the OS is the master infrastructure program that manages basic hardware resources and runs software, rather than an isolated error-finding utility.
  
  
  • cookies is incorrect because cookies are tiny text data files deposited by web servers onto a browser to track user session states and website preferences.
  
  
  • boot diskettes is incorrect because a boot disk is a physical removable storage medium containing the initialization files required to spin up an operating system, not an analysis application.
  
  

The correct answer is Vacuum Tubes and Valves because first-generation computing systems built in the 1940s and 1950s relied entirely on thermionic vacuum tubes to control electricity and perform calculations.

• Vacuum Tubes and Valves: This is the correct choice. Your original parameters had a truncated string ('Vacuum Tubes and'). First-generation computers like the ENIAC and UNIVAC used thousands of vacuum tubes. Because these tubes were large, generated immense heat, and broke down frequently, they required massive cooling infrastructure.


• Incorrect Options:
  
  
  
  • Transistors: This is incorrect. Transistors are the defining component of second-generation computers (late 1950s to mid-1960s). They replaced vacuum tubes because they were significantly smaller, faster, cheaper, and more energy-efficient.
  
  
  • Integrated Circuits: This is incorrect. Integrated Circuits (ICs) pioneered third-generation computing (mid-1960s to 1970s), combining hundreds of transistors onto a single silicon semiconductor chip.
  
  

The correct answer is Peopleware because it is the comprehensive overarching system term that represents the human element within computing infrastructures.

• Step 1 (System Categorization): A complete computing paradigm is structurally divided into three core pillars: Hardware (the physical machinery), Software (the operational code programs), and Peopleware (the actual human professionals who build, run, and service those systems).


• Step 2 (Application): Since the question spans multiple distinct human roles simultaneously (designers, coders, technicians), the all-inclusive collective category 'Peopleware' is the only accurate match.


• Incorrect Options:
  
  
  
  • Console- operator is incorrect because it refers strictly to a specific junior maintenance role focused on monitoring active system screens, omitting design and coding duties.
  
  
  • Programmer is incorrect on its own because programmers focus exclusively on writing and compiling software code strings, rather than broad structural hardware design or daily network operations.
  
  
  • System Analyst is incorrect on its own because an analyst concentrates heavily on system architecture requirements and business logic blueprints, not the hands-on maintenance or operation of hardware equipment.
  
  

The correct answer is Worm because history's computer pioneers borrowed the term 'worm' directly from John Brunner's 1975 sci-fi classic The Shockwave Rider to describe autonomous, self-propagating software vectors.

• Step 1 (Historical Etymology): In the novel, the protagonist creates a data-gathering program that crawls through a global network web to replicate itself. Researchers at Xerox PARC later adopted this exact nomenclature when engineering early distributed networking programs.


• Step 2 (Technical Contrast): Unlike a standard computer virus, which requires a human to run a compromised host file to activate, a network worm is completely independent. It travels across network links autonomously by exploiting unpatched software vulnerabilities.


• Incorrect Options:
  
  
  
  • Bug is incorrect because a bug represents an unintentional logical mistake or syntax error made by a developer within source code code.
  
  
  • Vice and Lice are completely incorrect options that have no technical relevance to malicious self-replicating network programs or Brunner's literary terminology.
  
  

The correct answer is JavaScript because Angular is a popular front-end web application framework built for developing dynamic and interactive user interfaces using JavaScript and TypeScript.

• What is Angular? Angular is an open-source framework developed by for building single-page applications (SPAs) and modern web applications.


• Primary Language: Angular is based on JavaScript and is commonly developed using TypeScript, which is a superset of JavaScript.


• Why JavaScript is Correct: Angular belongs to the JavaScript ecosystem and runs in web browsers to create responsive user interfaces.


• Why Other Options Are Incorrect:
  
  
  
  • PHP is a server-side scripting language and is not the framework on which Angular is based.
  
  
  • Python is a programming language used for various applications but is unrelated to Angular's core framework.
  
  
  • None is incorrect because Angular is clearly a JavaScript-based framework.
  
  

The correct answer is Modem.

• Meaning: Modem stands for Modulator-Demodulator.


• Function: It converts digital data from a computer into analog signals for transmission over analog communication lines and converts incoming analog signals back into digital data.


• Why Modem is Correct: Traditional telephone lines carry analog signals, while computers use digital data. A modem enables communication between these two systems.


• Why Other Options Are Incorrect:
  
  
  
  • Multiplexer combines multiple signals into one transmission channel.
  
  
  • Modulator only converts digital signals into analog form.
  
  
  • Demodulator only converts analog signals back into digital form.
  
  

The correct answer is Qwerty because QWERTY is the universal, globally standard typographic layout used for Latin-script computer keyboards.

• Step 1 (Design History): Patented by Christopher Sholes in 1878 for mechanical typewriters, the layout strategically separated common sequential letter pairs to prevent mechanical type bars from clashing and jamming during rapid typing.


• Step 2 (Modern Application): The name is a literal reference to the first six letters reading from left to right on the top row of alphabetic keys: Q-W-E-R-T-Y.


• Incorrect Options:
  
  
  
  • Asdfg is incorrect because it simply copies the first five characters of the central home row sequence, rather than representing an officially classified layout standard.
  
  
  • Azerty is incorrect as a general answer because while AZERTY is a real layout variation customized for French-speaking regions, QWERTY remains the definitive, baseline global key arrangement design.
  
  
  • None is incorrect because Qwerty is the accurate technical descriptor.
  
  

The correct answer is personal because the term 'personal computer' (PC) traditionally characterizes consumer microcomputers built around a single integrated microprocessor chip.

• Step 1 (Historical Definition): The dawn of the integrated microprocessor enabled computing power to shrink from room-sized installations down to desktop-sized workstations. This gave rise to the 'personal computer,' designed for individual daily operational use.


• Step 2 (Context Note): While modern servers and workstations also utilize microprocessors, within classic computer literacy questions, 'personal' is the intended historical descriptor used to finish this specific structural definition.


• Incorrect Options:
  
  
  
  • mainframe is incorrect because classic mainframe architectures historically utilized complex, custom distributed processors and multi-chip modules rather than a singular central consumer microprocessor package.
  
  
  • workstation is incorrect because it generally refers to an upgraded, high-end subset of personal computers customized for specialized engineering graphics, rather than the baseline category.
  
  
  • server is incorrect because a server describes a system's network service role rather than its core processor classification.
  
  

The correct answer is Second because the hallmark technical breakthrough of second-generation computing was replacing massive vacuum tubes with solid-state transistors.

• Step 1 (Historical Timeline): Spanning roughly from the late 1950s to the mid-1960s, second-generation computers abandoned delicate, power-hungry vacuum tubes in favor of transistors invented at Bell Labs.


• Step 2 (Hardware Impact): Transistors allowed computers to shrink drastically in physical size while becoming significantly faster, more energy-efficient, cheaper to build, and far more reliable.


• Incorrect Options:
  
  
  
  • First is incorrect because first-generation computers relied entirely on glass vacuum tubes for circuitry and magnetic drums for memory.
  
  
  • Third is incorrect because third-generation computers transitioned to silicon Integrated Circuits (ICs), which condensed multiple transistors onto a single microchip.
  
  
  • Fourth is incorrect because fourth-generation computers are defined by Very Large Scale Integration (VLSI) microprocessors, which pack millions of transistors onto a single silicon chip.
  
  

The correct answer is Third because the integration of silicon integrated circuits (ICs) during the third generation of computing provided the processing speed and memory management needed to handle real-time transaction tracking.

• Step 1 (Evolutionary Context): First and second-generation systems relied heavily on sequential batch processing, where programs were queued up and executed as a single slow block.


• Step 2 (Technical Advancement): Third-generation computing (mid-1960s to early 1970s) introduced advanced multiprogramming capabilities, text terminal interfaces, and magnetic disk storage. These features allowed systems to receive, process, and update data instantly—giving rise to interactive, real-time booking and transactional platforms.


• Incorrect Options:
  
  
  
  • First is incorrect because first-generation computers used vacuum tubes, punched cards, and basic serial processing layouts that were far too slow to handle dynamic, live user interactions.
  
  
  • Second is incorrect because transistor-based second-generation computers remained strictly bound to sequential batch processing workflows.
  
  
  • Fourth is incorrect because fourth-generation computers (built around microprocessors) expanded on real-time systems by introducing global distributed networking, personal computers, and modern internet layers rather than establishing their initial popularity.
  
  

The correct answer is All of the because a modern, fully functional website serves as a central hub that hosts interconnected documents, visual media, and streaming elements together.

• Step 1 (Core Composition): At its structural baseline, a website is a collection of related web pages (HTML documents) that are grouped under a shared domain name.


• Step 2 (Multimedia Integration): To make pages engaging and informative, developers embed Graphic Files (such as images, logos, and icons) along with Audio and Video Files (multimedia content) directly into the page architecture, making all these components vital pieces of a completed site.


• Incorrect Options:
  
  
  
  • web pages is incorrect on its own because it ignores the graphic and multimedia assets that naturally comprise web ecosystems.
  
  
  • Graphic Files is incorrect on its own because pictures require an underlying markup page layout to be structured and viewed on the web.
  
  
  • Audio and Video Files is incorrect on its own because media files are supplementary assets rather than the entire website framework.
  
  

The correct answer is Operating because it represents an overarching system platform, whereas the other three choices are highly specific language translation utilities.

• Step 1 (Functional Classification): Interpreters, Compilers, and Assemblers are distinct tools categorized as Language Translators. Their sole purpose is to convert raw human-readable software source code into binary machine execution code.


• Step 2 (Application): An Operating System (abbreviated as 'Operating' in this system string) is the entire environment that manages physical hardware, schedules processor cycles, and hosts these language translators. This makes it structural distinct from the translation utilities.


• Incorrect Options:
  
  
  
  • Interpreter is incorrect because it translates code sequentially line-by-line during runtime, grouping it symmetrically with compilers and assemblers as translator software.
  
  
  • Compiler is incorrect because it translates entire source files into executable binaries at once, placing it firmly in the language translator category.
  
  
  • Assembler is incorrect because it translates lower-level assembly language mnemonics directly into machine code, locking it into the translator group.
  
  

The correct answer is Herman because Herman Hollerith successfully invented and implemented the first automated punched-card data processing system for the 1890 United States Census.

• Step 1 (Historical Impact): Facing a massive backlog of census records, American inventor Herman Hollerith designed a tabulating machine that read data from stiff paper cards containing holes punched in precise grid locations.


• Step 2 (Legacy): This breakthrough automated data counting, saving years of manual sorting, and laid the corporate foundations for what would later evolve into IBM. (Note: While Joseph Marie Jacquard used punched cards earlier in 1801 to automate textile weaving loops on looms, Hollerith is universally recognized in computer science text banks as the pioneer who introduced punch cards specifically for data processing and computing application tracks).


• Incorrect Options:
  
  
  
  • Powers is incorrect because James Powers developed a later variation of punched-card equipment for the 1910 census, building upon Hollerith's established frameworks.
  
  
  • Pascal is incorrect because Blaise Pascal invented the Pascaline in 1642, which was a purely mechanical calculator utilizing interlocking geared wheels rather than card media inputs.
  
  
  • Jacquard is a common historical mix-up; his brilliant cards automated silk patterns on weaving looms rather than computing or sorting alphanumeric data matrices.
  
  

The correct answer is TCP/IP because Transmission Control Protocol/Internet Protocol is the foundational architectural suite that governs how data is packetized, addressed, and routed globally across the internet.

• Step 1 (Core Architecture): TCP/IP acts as the universal language of the internet. The TCP layer handles connection reliability by breaking files into small packets and verifying they land safely at the destination without errors.


• Step 2 (Routing Protocol): The IP layer manages the routing mapping, ensuring that every individual data packet is stamped with the correct source and destination IP addresses to travel successfully through global network switches.


• Incorrect Options:
  
  
  
  • HTTP (HyperText Transfer Protocol) is incorrect because it is a higher-level application protocol used specifically to fetch web pages, running completely on top of the underlying TCP/IP transport layer.
  
  
  • WWW (World Wide Web) is incorrect because it is an information system layer of linked documents accessed via internet channels, not a data transmission protocol.
  
  
  • FTP (File Transfer Protocol) is incorrect because it is a specialized application standard used exclusively for raw file transfers, relying entirely on TCP/IP to operate.
  
  

The correct answer is Print screen because this dedicated keyboard key triggers the operating system to capture the active visual frame of your monitor.

• Step 1 (Operational Process): Striking the Print screen (often labeled as PrtScn) key instantly copies a snapshot image of your entire current screen layout directly into the system's temporary clipboard buffer.


• Step 2 (Application): Once stored in the clipboard, you can use the standard Paste command (Ctrl+V) to drop the captured image file into text documents, graphic editors, or communication channels.


• Incorrect Options:
  
  
  
  • Alt Key is a modifier key used in combination with other keystrokes to execute menu shortcuts, though pressing Alt+PrtScn specifically captures only the currently active window instead of the full screen.
  
  
  • Shift key is a modifier key used to type uppercase letters or alternate secondary characters.
  
  
  • None of is incorrect because 'Print screen' is the accurate technical command.
  
  

The correct answer is Charles because Charles Babbage is historically recognized as the 'father of computing' for designing the first mechanical general-purpose computer concepts.

• Step 1 (Historical Framework): In the 19th century, Charles Babbage conceptualized and designed the Difference Engine and the Analytical Engine.


• Step 2 (Computational Blueprint): His Analytical Engine blueprint featured an Arithmetic Logic Unit (ALU), basic control flow integration, and integrated memory, forming the foundational architecture for modern computer design.


• Incorrect Options:
  
  
  
  • Allen Turing (Alan Turing) is recognized as the father of modern theoretical computer science and artificial intelligence, establishing the mathematical foundations of computer algorithms.
  
  
  • Simur Cray is an incorrect configuration or typo string for computer engineer Seymour Cray, who pioneered modern supercomputer systems.
  
  
  • Augusta (Ada Lovelace, Countess of Lovelace) is celebrated as history's first computer programmer for developing the initial algorithm intended to run on Babbage's Analytical Engine.