Computer Fundamentals MCQs – Set-1 | 50 questions covering computer components, data representation, memory, software, interfaces, and basic system operation.
Mixed difficulty · Select one answer and open each explanation to review the concept.
Which component executes program instructions?
A CPU
B RAM
C Monitor
D Keyboard
Answer: A. CPU. The central processing unit executes program instructions and coordinates computational work.
What does the CPU’s arithmetic logic unit perform?
A File storage
B Arithmetic and logic
C Network routing
D Screen rendering
Answer: B. Arithmetic and logic. The arithmetic logic unit performs arithmetic calculations and logical comparisons.
Which CPU unit directs instruction operations?
A Cache
B Register
C Control unit
D Power unit
Answer: C. Control unit. The control unit directs the flow and timing of operations inside the processor.
What is the smallest binary data unit?
A Byte
B Word
C Pixel
D Bit
Answer: D. Bit. A bit is one binary digit and can represent 0 or 1.
How many bits make one byte?
A Eight bits
B Four bits
C Sixteen bits
D Two bits
Answer: A. Eight bits. A byte is conventionally defined as a sequence of eight bits.
Which values can one bit represent?
A 1 or 2
B 0 or 1
C 0 through 9
D Any letter
Answer: B. 0 or 1. A bit is a binary digit whose value is zero or one.
What does RAM mainly hold during active work?
A Archived backups
B Printed documents
C Working data
D Firmware updates
Answer: C. Working data. RAM holds data and instructions that the processor is actively using.
What happens to volatile RAM after power loss?
A It keeps every file
B It becomes read-only
C It moves to cache
D Its contents are lost
Answer: D. Its contents are lost. Volatile working memory requires power to retain its current contents.
Which storage keeps saved files without power?
A Nonvolatile storage
B CPU register
C Display memory
D Input buffer
Answer: A. Nonvolatile storage. Nonvolatile storage retains stored information when system power is off.
Which small memory keeps frequently used data near the CPU?
A USB storage
B Cache memory
C Optical disc
D Network folder
Answer: B. Cache memory. Cache is small, fast memory that helps supply frequently used data to the processor.
Which location offers the fastest direct CPU data access?
A Hard drive
B RAM module
C CPU register
D Optical disc
Answer: C. CPU register. Registers inside the processor provide extremely fast access to values needed for immediate operations.
What is the main circuit board that connects components?
A Power adapter
B Graphics card
C Memory chip
D Motherboard
Answer: D. Motherboard. The motherboard links the processor, memory, storage connections, and other system components.
Which statement best describes computer hardware?
A Physical computer components
B Programs and instructions
C Stored user accounts
D Network addresses
Answer: A. Physical computer components. Hardware means the tangible physical components of a computer system.
What best describes computer software?
A A circuit board
B Programs and instructions
C A storage connector
D A cooling fan
Answer: B. Programs and instructions. Software is the set of programs and instructions that direct computer hardware.
Which device primarily enters typed text?
A Speaker
B Printer
C Keyboard
D Projector
Answer: C. Keyboard. A keyboard is an input device used to enter text and commands.
Where does a computer display visual output?
A Scanner
B Microphone
C Mouse
D Monitor
Answer: D. Monitor. A monitor presents visual output from the computer.
Why can a touchscreen serve two roles?
A Touch input, screen output
B It prints and scans pages
C It stores and deletes files
D It routes and filters packets
Answer: A. Touch input, screen output. A touchscreen accepts touch input while also displaying visual output.
Which device creates a paper copy from a digital file?
A Webcam
B Printer
C Router
D Microphone
Answer: B. Printer. A printer produces a physical output copy of digital information.
What does a scanner do to a paper page?
A Projects it on a wall
B Plays it as sound
C Converts it to digital data
D Sends it to speakers
Answer: C. Converts it to digital data. A scanner captures physical documents or images as digital input.
Which software layer manages memory, devices, and processes?
A Spreadsheet
B Web browser
C Photo editor
D Operating system
Answer: D. Operating system. An operating system manages hardware resources and provides services for applications.
Which item is application software?
A Word processor
B CPU cooler
C Network cable
D Memory module
Answer: A. Word processor. A word processor is application software that helps users create and edit documents.
What is firmware best described as?
A A printed circuit
B Software built into a device
C A temporary spreadsheet
D A network cable
Answer: B. Software built into a device. Firmware is software stored in a device to provide low-level control of its hardware.
When raw measurements are organized into meaning, they become what?
A Hardware
B Source code
C Information
D Firmware
Answer: C. Information. Information is data that has been processed or organized to convey meaning.
Which number base does binary notation use?
A Base eight
B Base ten
C Base sixteen
D Base two
Answer: D. Base two. Binary notation uses two digits, 0 and 1, so its base is two.
What decimal value does binary 1010 represent?
A 10
B 8
C 12
D 14
Answer: A. 10. Binary 1010 equals decimal 10 because its place values are 8 and 2.
How is decimal thirteen written in binary?
A 1011
B 1101
C 1110
D 1001
Answer: B. 1101. Decimal thirteen is 1101 in binary: eight plus four plus one.
How many different patterns can eight bits encode?
A 64
B 128
C 256
D 512
Answer: C. 256. Eight binary positions allow 2 to the power of 8, or 256, possible patterns.
What does a filename extension usually indicate?
A The file’s location
B The creator’s password
C Its storage device
D A suggested file type
Answer: D. A suggested file type. A filename extension commonly signals a file type, though it does not guarantee the contents match.
What does a file system organize?
A Files and directories
B CPU instructions only
C Screen pixels
D Power settings
Answer: A. Files and directories. A file system organizes, names, stores, and retrieves files and directories.
How are related files commonly grouped?
A In a processor core
B In a folder
C In a screen pixel
D In a power supply
Answer: B. In a folder. Folders or directories group files and may contain other folders.
Which interface lets users type textual commands?
A Graphical interface
B Touch interface
C Command-line interface
D Voice interface
Answer: C. Command-line interface. A command-line interface accepts typed commands to interact with the computer.
What does a graphical user interface present?
A Only printed output
B Only numeric data
C Only typed commands
D Windows, icons, and menus
Answer: D. Windows, icons, and menus. A graphical user interface presents visual elements such as windows, icons, and menus.
Which firmware feature selects a boot target by configured order?
A UEFI boot manager
B Text editor
C File compressor
D Screen reader
Answer: A. UEFI boot manager. The UEFI boot manager uses configured boot-order variables to choose drivers or applications, including an operating-system loader.
What is the bootloader’s main role?
A Edit user documents
B Start the operating system
C Cool the processor
D Store long-term backups
Answer: B. Start the operating system. A bootloader is the program selected during startup to load or start the operating system.
What does a power supply unit do inside a desktop computer?
A Routes web traffic
B Stores active programs
C Converts wall power for components
D Renders 3D scenes
Answer: C. Converts wall power for components. The power supply converts incoming electrical power into suitable power for internal components.
Which processor is specialized for graphics calculations?
A Network interface
B Sound card
C Storage controller
D Graphics processing unit
Answer: D. Graphics processing unit. A graphics processing unit specializes in graphics and other highly parallel calculations.
What is the main purpose of a network interface card?
A Network connection
B Display images on screen
C Cool a computer case
D Store program files
Answer: A. Network connection. A network interface card provides a computer with a network connection.
Which connector commonly links peripherals and transfers data?
A HDMI
B USB
C VGA
D PS/2
Answer: B. USB. USB is a widely used interface for connecting peripherals and transferring data.
What does a processor clock rate measure?
A Storage capacity
B Screen resolution
C Cycles per second
D Number of files
Answer: C. Cycles per second. Clock rate describes the number of timing cycles per second and is measured in hertz.
Which unit represents one cycle per second?
A Byte
B Pixel
C Volt
D Hertz
Answer: D. Hertz. One hertz equals one cycle per second.
What is a CPU core?
A CPU execution unit
B A folder on a disk
C A data cable
D A type of computer screen
Answer: A. CPU execution unit. A core is a processing unit within a CPU capable of executing instructions.
What does a multicore processor contain?
A Several operating systems
B Multiple CPU cores
C Several power supplies
D Multiple keyboards
Answer: B. Multiple CPU cores. A multicore processor contains two or more processing cores.
Which sequence summarizes a basic computing workflow?
A Output, input, storage
B Storage, output, input
C Input, process, output
D Process, output, input
Answer: C. Input, process, output. A basic input-process-output model describes data entering, being processed, and producing results.
How many bytes are in one kibibyte (KiB)?
A 100 bytes
B 1,000 bytes
C 1,024 bits
D 1,024 bytes
Answer: D. 1,024 bytes. A kibibyte is a binary multiple equal to 2 to the power of 10 bytes, or 1,024 bytes.
How many bytes are in one kilobyte (kB) using SI prefixes?
A 1,000 bytes
B 1,024 bytes
C 100 bytes
D 10,000 bytes
Answer: A. 1,000 bytes. The SI prefix kilo means a factor of 1,000; kB therefore means 1,000 bytes.
Which drive stores data on rotating magnetic platters?
A Solid-state drive
B Hard disk drive
C USB flash drive
D Memory card
Answer: B. Hard disk drive. A hard disk drive stores data magnetically on rotating platters.
Which technology stores data in a typical SSD?
A Magnetic tape
B Optical film
C Flash memory
D Paper punch cards
Answer: C. Flash memory. Solid-state drives use nonvolatile flash memory and have no moving disk platters.
Which memory is usually volatile working memory?
A Blu-ray disc
B Hard disk drive
C USB flash drive
D RAM
Answer: D. RAM. RAM is the computer’s volatile working memory for currently active data and instructions.
What is an algorithm?
A Ordered problem-solving steps
B A physical storage device
C A graphics connector
D A type of computer screen
Answer: A. Ordered problem-solving steps. An algorithm is an ordered set of steps designed to solve a problem or perform a task.
Which encoding can represent Unicode text with variable-length bytes?
A ASCII-8
B UTF-8
C BCD
D EBCDIC-4
Answer: B. UTF-8. UTF-8 maps Unicode code points to sequences of one to four 8-bit bytes.