Computer Awareness & Fundamentals — Set 01
Standard: OSSSC, OSSC, Odisha Police, Banking, SSC CGL/CHSL, Railways & Teaching Exams | 50 Foundational Computer MCQs.
1. Who is universally acknowledged as the "Father of the Modern Computer"?
- A) Alan Turing
- B) Charles Babbage
- C) John von Neumann
- D) Blaise Pascal
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Correct Answer: B) Charles Babbage
Explanation: Charles Babbage designed the Difference Engine and the Analytical Engine in the 19th century, establishing the basic architectural concepts (input, processing, memory, output) on which all modern computers are built.
2. Which electronic component was used as the primary internal memory/switching device in First Generation computers?
- A) Transistors
- B) Integrated Circuits (ICs)
- C) Vacuum Tubes (Thermionic Valves)
- D) Microprocessors
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Correct Answer: C) Vacuum Tubes (Thermionic Valves)
Explanation: First-generation computers (1940–1956, e.g., ENIAC, UNIVAC) relied on bulky vacuum tubes for circuitry and magnetic drums for memory. Transistors were introduced in the second generation, ICs in the third, and microprocessors (VLSI) in the fourth.
3. What is the full form of the computing term "ALU"?
- A) Arithmetic Logic Unit
- B) Array Logic Unit
- C) Automated Linear Unit
- D) Application Level Unit
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Correct Answer: A) Arithmetic Logic Unit
Explanation: The ALU is the fundamental sub-unit of the Central Processing Unit (CPU) responsible for executing all arithmetic operations (addition, subtraction, multiplication) and logical decisions (comparison, AND, OR, NOT).
4. Which unit of the CPU is responsible for directing, coordinating, and controlling the operations of all other hardware components?
- A) Register Set
- B) Arithmetic Logic Unit
- C) Control Unit (CU)
- D) Cache Memory
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Correct Answer: C) Control Unit (CU)
Explanation: The Control Unit acts as the central supervisor or "traffic police" of the processor. It fetches instructions from main memory, decodes them, and coordinates the flow of control signals to the ALU, registers, and I/O devices.
5. A group of 4 contiguous binary digits (bits) is collectively known as a:
- A) Byte
- B) Nibble
- C) Word
- D) Block
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Correct Answer: B) Nibble
Explanation: In computer storage terminology: 1 Bit = 0 or 1; 1 Nibble = 4 bits (half a byte); 1 Byte = 8 bits; 1 Word = processor-dependent bit length (typically 32 or 64 bits).
6. Exactly how many bytes are present in one Kilobyte (1 KB) in binary storage measurement?
- A) 1000 bytes
- B) 1024 bytes
- C) 1048 bytes
- D) 512 bytes
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Correct Answer: B) 1024 bytes
Explanation: Computers operate on binary logic (base 2). Hence, $1\text{ KB} = 2^{10}\text{ bytes} = 1024\text{ bytes}$. Similarly, $1\text{ MB} = 1024\text{ KB}$, and $1\text{ GB} = 1024\text{ MB}$.
7. Which among the following types of memory is volatile, losing all stored data as soon as the power supply is switched off?
- A) Read-Only Memory (ROM)
- B) Random Access Memory (RAM)
- C) Flash Memory
- D) Hard Disk Drive (HDD)
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Correct Answer: B) Random Access Memory (RAM)
Explanation: RAM is primary volatile memory that requires continuous electric current to maintain its state. When powered off, RAM loses its contents. ROM, Hard Disks, and Flash memory are non-volatile permanent storage media.
8. What is the startup routine stored permanently on a motherboard's ROM chip called, which boots the computer and checks connected hardware?
- A) Device Driver
- B) BIOS (Basic Input/Output System)
- C) Kernel
- D) Compiler
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Correct Answer: B) BIOS (Basic Input/Output System)
Explanation: The BIOS (or modern UEFI) is firmware stored permanently on a non-volatile ROM chip. When the system powers on, the BIOS initiates the POST (Power-On Self-Test) and loads the operating system kernel into RAM from storage.
9. What does the initial diagnostic process POST stand for during computer boot-up?
- A) Power-On Self-Test
- B) Program Operating System Transfer
- C) Primary Output Switching Terminal
- D) Protocol Open Software Tool
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Correct Answer: A) Power-On Self-Test
Explanation: POST is an automated routine executed by the BIOS immediately upon startup to verify that essential hardware devices (RAM, keyboard, CPU, graphics adapter) are functioning properly before attempting to boot the OS.
10. Which type of memory is the fastest internal storage located directly inside the CPU chip?
- A) Main Memory (RAM)
- B) CPU Registers
- C) L3 Cache
- D) Solid State Drive (SSD)
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Correct Answer: B) CPU Registers
Explanation: In the computer memory hierarchy, CPU Registers (e.g., Accumulator, Program Counter, Instruction Register) are the fastest, smallest, and most immediate storage locations, operating at the processor's core clock speed.
11. High-speed buffer memory placed between the CPU and main RAM to bridge the speed mismatch between them is termed:
- A) Virtual Memory
- B) Cache Memory
- C) Secondary Storage
- D) Optical Storage
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Correct Answer: B) Cache Memory
Explanation: Cache memory is built from extremely fast Static RAM (SRAM) and holds frequently accessed instructions and data so the processor does not have to wait for the comparatively slow Dynamic RAM (DRAM).
12. Which of the following hardware devices functions strictly as an INPUT device?
- A) Plotter
- B) Optical Mark Reader (OMR)
- C) Dot Matrix Printer
- D) Computer Monitor
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Correct Answer: B) Optical Mark Reader (OMR)
Explanation: An OMR scanner captures pencil/pen marks on formatted sheets and converts them into digital signals for the computer, making it purely an input device. Printers, plotters, and monitors produce output.
13. Which device is used to produce high-precision vector graphics, large architectural drawings, engineering blueprints, and banners?
- A) Laser Printer
- B) Plotter
- C) Inkjet Printer
- D) Visual Display Unit (VDU)
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Correct Answer: B) Plotter
Explanation: A plotter is a specialized vector graphics output printing device that draws continuous high-resolution lines using robotic pens or inkjet heads, typically utilized by architects and CAD designers for large-format blueprints.
14. The resolution and sharpness of a computer display monitor or printed page is measured in terms of:
- A) Hertz (Hz)
- B) Bits Per Second (bps)
- C) Pixels or Dots Per Inch (DPI)
- D) Megabytes (MB)
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Correct Answer: C) Pixels or Dots Per Inch (DPI)
Explanation: Display monitors measure resolution as the total grid of individual picture elements (pixels, e.g., 1920×1080), while physical printers measure print resolution and output density in Dots Per Inch (DPI).
15. What technology is utilized in banking cheques to automate processing and verify authenticity using magnetized ink characters?
- A) OCR (Optical Character Recognition)
- B) MICR (Magnetic Ink Character Recognition)
- C) OMR (Optical Mark Recognition)
- D) Barcode Reader
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Correct Answer: B) MICR (Magnetic Ink Character Recognition)
Explanation: MICR technology reads characters printed with special magnetic iron oxide ink at the bottom of bank cheques (the 9-digit MICR code), ensuring rapid scanning and fraud deterrence.
16. The clock speed of a modern personal computer microprocessor is typically expressed in:
- A) Megabits per second (Mbps)
- B) Gigahertz (GHz)
- C) Nanoseconds (ns)
- D) Milliamperes (mA)
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Correct Answer: B) Gigahertz (GHz)
Explanation: Processor clock speed measures the frequency of internal clock pulses synchronizing CPU circuitry. Modern CPUs operate at billions of cycles per second, designated in Gigahertz ($1\text{ GHz} = 10^9\text{ cycles/second}$).
17. What is the main structural printed circuit board (PCB) connecting the CPU, RAM, expansion cards, and storage drives together?
- A) Breadboard
- B) Motherboard (System Board)
- C) Control Console
- D) Expansion Hub
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Correct Answer: B) Motherboard (System Board)
Explanation: The motherboard is the primary backbone printed circuit board in all personal computers. It houses the CPU socket, memory slots, chipsets, power connectors, and expansion bus slots.
18. What is the full form of the widely used external expansion connection standard "USB"?
- A) Universal Serial Bus
- B) United System Bridge
- C) Universal Synchronous Board
- D) Uniform Storage Block
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Correct Answer: A) Universal Serial Bus
Explanation: USB stands for Universal Serial Bus. It provides a standardized plug-and-play interface for connecting peripherals (mice, keyboards, printers, flash drives) and supplying DC electrical power.
19. Which of the following is classified as "System Software"?
- A) Microsoft Word
- B) Adobe Photoshop
- C) Operating System
- D) Google Chrome Browser
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Correct Answer: C) Operating System
Explanation: System software includes the Operating System (Windows, Linux, macOS), device drivers, and core utilities that manage computer hardware. Software designed for user tasks (word processing, browsing) is Application Software.
20. A translator program that converts an entire high-level language source program into machine code in a single comprehensive pass before execution is a:
- A) Interpreter
- B) Assembler
- C) Compiler
- D) Linker
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Correct Answer: C) Compiler
Explanation: A Compiler translates the whole high-level program (C, C++) into machine code all at once, generating a standalone executable object file. An Interpreter (Python, Ruby) translates and runs the program line by line.
21. Which software utility translates mnemonic-based Low-Level Assembly Language instructions directly into binary machine code?
- A) Compiler
- B) Assembler
- C) Interpreter
- D) Debugger
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Correct Answer: B) Assembler
Explanation: An Assembler is a language translator that converts symbolic, human-readable assembly language mnemonics (e.g., MOV, ADD, JMP) directly into 0s and 1s machine code instructions.
22. Software whose human-readable source code is freely available to the public to inspect, modify, and enhance is known as:
- A) Proprietary Software
- B) Shareware
- C) Open-Source Software (OSS)
- D) Firmware
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Correct Answer: C) Open-Source Software (OSS)
Explanation: Open-source software (such as the Linux OS, LibreOffice, Apache server) is released under licenses allowing anyone to study, alter, and distribute its source code freely.
23. Which of the following is a classic example of an Open-Source Operating System?
- A) Microsoft Windows 11
- B) Apple macOS
- C) Linux
- D) Apple iOS
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Correct Answer: C) Linux
Explanation: The Linux kernel, initially developed by Linus Torvalds, is distributed under the GNU General Public License (GPL) and is entirely open source. Windows, macOS, and iOS are proprietary commercial operating systems.
24. In modern operating systems, what is the core innermost component that manages CPU time, memory allocation, and hardware device communication called?
- A) Shell
- B) Kernel
- C) File Explorer
- D) Spooler
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Correct Answer: B) Kernel
Explanation: The Kernel is the central heart of the operating system. It remains permanently in main memory and controls low-level hardware access, process scheduling, memory virtualization, and system calls.
25. The operating system technique of executing multiple software programs seemingly simultaneously on a single CPU core is called:
- A) Multiprocessing
- B) Multitasking (Time-Sharing)
- C) Multithreading
- D) Spooling
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Correct Answer: B) Multitasking (Time-Sharing)
Explanation: Multitasking allows a single processor to switch rapidly between active tasks by allocating short CPU time slices (quanta) to each program, creating the user illusion of simultaneous execution.
26. A feature where the operating system temporarily uses a portion of hard disk storage as an extension of physical RAM is known as:
- A) Cache Storage
- B) Virtual Memory
- C) Flash Buffer
- D) Direct Memory Access (DMA)
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Correct Answer: B) Virtual Memory
Explanation: Virtual memory uses a swap file or paging file on the storage drive (HDD/SSD) to simulate additional physical RAM, enabling the system to run large programs that exceed available physical memory.
27. What is the standard Windows keyboard shortcut used to permanently delete a selected file without sending it to the Recycle Bin?
- A) Ctrl + Delete
- B) Shift + Delete
- C) Alt + Delete
- D) Tab + Delete
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Correct Answer: B) Shift + Delete
Explanation: Pressing standard "Delete" sends items to the temporary Recycle Bin. Pressing "Shift + Delete" bypasses the Recycle Bin and marks the storage clusters for immediate reallocation.
28. Which universal keyboard shortcut is used across most operating systems and web browsers to Refresh/Reload the active window?
- A) F1
- B) F2
- C) F5
- D) F12
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Correct Answer: C) F5
Explanation: The F5 function key refreshes the active webpage, file directory, or desktop view. F1 opens Help, F2 renames a selected object, and F12 opens the Save As dialog or Developer Tools.
29. What is the global default keyboard shortcut for opening the Windows Task Manager directly?
- A) Ctrl + Shift + Esc
- B) Ctrl + Alt + Delete
- C) Alt + F4
- D) Windows Key + R
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Correct Answer: A) Ctrl + Shift + Esc
Explanation: Ctrl + Shift + Esc directly launches the Task Manager interface. Ctrl + Alt + Delete opens the security lock screen options menu from which Task Manager can also be selected.
30. What is the default file extension for documents saved in modern versions of Microsoft Word (Word 2007 and newer)?
- A) .doc
- B) .docx
- C) .txt
- D) .rtf
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Correct Answer: B) .docx
Explanation: Starting with Office 2007, Microsoft adopted the open XML-based file architecture. Word documents end with ".docx", Excel workbooks with ".xlsx", and PowerPoint presentations with ".pptx". Earlier versions used ".doc".
31. In Microsoft Word, which keyboard shortcut aligns the selected text centrally between page margins?
- A) Ctrl + C
- B) Ctrl + E
- C) Ctrl + J
- D) Ctrl + R
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Correct Answer: B) Ctrl + E
Explanation: Ctrl + E applies Center Alignment. Ctrl + L aligns Left, Ctrl + R aligns Right, and Ctrl + J applies Justified alignment (equal margins on both sides). Ctrl + C is reserved for Copy.
32. In Microsoft Excel, every custom formula or mathematical expression must begin with which character?
- A) Plus sign (+)
- B) Equals sign (=)
- C) Hash sign (#)
- D) Colon sign (:)
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Correct Answer: B) Equals sign (=)
Explanation: An equals sign ($=$) informs Excel's calculation engine that the subsequent characters represent a formula or function to evaluate, rather than simple plain text or a literal number.
33. In an Excel worksheet, the point where a vertical column and a horizontal row intersect is known as a:
- A) Block
- B) Cell
- C) Coordinate
- D) Range
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Correct Answer: B) Cell
Explanation: The intersection of a column (denoted by a letter, e.g., A) and a row (denoted by a number, e.g., 1) forms a single data container called a Cell, uniquely referenced by its address (e.g., A1).
34. Which function key is pressed in Microsoft PowerPoint to launch the slide show presentation from the very first slide?
- A) F5
- B) Shift + F5
- C) F7
- D) Ctrl + P
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Correct Answer: A) F5
Explanation: Pressing F5 starts the PowerPoint slideshow presentation from Slide 1. Pressing Shift + F5 starts the presentation from the currently active slide.
35. Which computer network classification spans a small localized area such as a home, single office room, or school building?
- A) Wide Area Network (WAN)
- B) Metropolitan Area Network (MAN)
- C) Local Area Network (LAN)
- D) Personal Area Network (PAN)
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Correct Answer: C) Local Area Network (LAN)
Explanation: LANs cover confined physical boundaries with high data-transfer speeds (using Ethernet or Wi-Fi). MAN covers an entire city, while WAN (like the Internet) spans countries and continents.
36. In network topologies, which arrangement connects all computers to a single continuous central transmission cable backbone?
- A) Star Topology
- B) Bus Topology
- C) Ring Topology
- D) Mesh Topology
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Correct Answer: B) Bus Topology
Explanation: In a Bus topology, all workstations and servers share a single linear central coaxial or twisted-pair cable called the bus. Terminators are attached at both physical ends to prevent signal reflection.
37. What network device forwards data packets across different computer networks by inspecting their destination IP addresses?
- A) Hub
- B) Router
- C) Repeater
- D) Modem
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Correct Answer: B) Router
Explanation: A Router operates at Layer 3 (Network Layer) of the OSI model. It uses routing tables to inspect incoming packets and dispatch them along the optimal path across interconnected networks.
38. What is the full form of the fundamental networking protocol suite abbreviation "TCP/IP"?
- A) Transmission Control Protocol / Internet Protocol
- B) Terminal Connection Provider / Internal Protocol
- C) Telecommunication Central Protocol / Internet Package
- D) Transfer Communication Path / Information Pathway
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Correct Answer: A) Transmission Control Protocol / Internet Protocol
Explanation: TCP/IP is the foundational communication framework of the global Internet. TCP handles packet delivery, ordering, and error verification; IP handles logical addressing and packet routing.
39. An IPv4 (Internet Protocol Version 4) address consists of how many total binary bits?
- A) 16 bits
- B) 32 bits
- C) 64 bits
- D) 128 bits
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Correct Answer: B) 32 bits
Explanation: An IPv4 address is 32 bits long, formatted as four 8-bit octets separated by dots (e.g., 192.168.1.1). IPv6 addresses were introduced to prevent address exhaustion and consist of 128 bits.
40. What permanent physical address is assigned to a Network Interface Card (NIC) by its manufacturer?
- A) IP Address
- B) MAC (Media Access Control) Address
- C) URL
- D) Subnet Mask
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Correct Answer: B) MAC (Media Access Control) Address
Explanation: A MAC address is a 48-bit (6-byte) unique hardware identifier hardcoded into the network adapter firmware at the factory. It operates at Layer 2 (Data Link Layer) of the OSI model.
41. What system functions as the "phonebook of the Internet," translating human-friendly domain names (like www.google.com) into numeric IP addresses?
- A) HTTP
- B) DNS (Domain Name System)
- C) FTP
- D) DHCP
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Correct Answer: B) DNS (Domain Name System)
Explanation: The Domain Name System (DNS) resolves human-readable hostnames into computer-routable IP addresses (e.g., translating "example.com" to "93.184.216.34") so browsers can load internet resources.
42. What standard protocol is used specifically for uploading and transferring files between a local computer and a remote web server?
- A) SMTP
- B) FTP (File Transfer Protocol)
- C) POP3
- D) SNMP
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Correct Answer: B) FTP (File Transfer Protocol)
Explanation: FTP is a client-server network protocol designed specifically for transferring files across networks. SMTP handles outgoing email, while POP3/IMAP handles incoming email retrieval.
43. In web addresses (URLs), what does the additional letter "S" in "HTTPS" signify regarding connection security?
- A) System
- B) Secure
- C) Server
- D) Standard
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Correct Answer: B) Secure
Explanation: HTTPS stands for HyperText Transfer Protocol Secure. It encrypts all communications between the browser and website using TLS/SSL cryptographic protocols to protect against eavesdropping.
44. A network security system that monitors and filters incoming and outgoing network traffic based on predetermined security rules is called a:
- A) Gateway
- B) Firewall
- C) Proxy Cache
- D) Antivirus Scanner
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Correct Answer: B) Firewall
Explanation: A firewall establishes a barrier between a trusted internal network and untrusted external networks (such as the Internet) to block unauthorized access and prevent cyber intrusions.
45. What type of malware disguises itself as legitimate, useful software to trick the user into installing it, while secretly harboring malicious payload?
- A) Computer Worm
- B) Trojan Horse
- C) Macro Virus
- D) Ransomware
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Correct Answer: B) Trojan Horse
Explanation: Borrowed from ancient Greek legend, a Trojan Horse masquerades as genuine software (like a game or utility). Unlike viruses and worms, Trojans do not self-replicate; they rely on user deception to execute.
46. The fraudulent practice of sending deceptive emails purporting to be from reputable companies to trick individuals into revealing passwords or credit card numbers is:
- A) Spooling
- B) Phishing
- C) Splicing
- D) Sniffing
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Correct Answer: B) Phishing
Explanation: Phishing is a social engineering attack where attackers spoof trusted entities (e.g., banks, tech support) via forged emails or look-alike login portals to harvest credentials and sensitive financial data.
47. What type of malicious software encrypts a victim's personal files and demands monetary payment in exchange for the decryption key?
- A) Spyware
- B) Adware
- C) Ransomware
- D) Rootkit
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Correct Answer: C) Ransomware
Explanation: Ransomware (e.g., WannaCry, Locky) infects a system, uses strong cryptography to lock documents, and displays an extortion message demanding cryptocurrency payment to unlock them.
48. Unsolicited, bulk commercial email messages sent indiscriminately to large numbers of recipients are commonly known as:
- A) Phishing
- B) Spam (Junk Mail)
- C) Malware
- D) Spoofing
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Correct Answer: B) Spam (Junk Mail)
Explanation: Spam refers to unwanted bulk email messages, typically containing marketing promotions or suspicious links, automatically filtered by modern mail providers into a Junk/Spam folder.
49. What is the base radix of the Hexadecimal number system widely used in computer memory addressing?
- A) Base 2
- B) Base 8
- C) Base 10
- D) Base 16
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Correct Answer: D) Base 16
Explanation: Hexadecimal is a base-16 positional numeral system. It uses 16 distinct symbols: the numbers 0–9 to represent values 0 through 9, and the letters A–F to represent values 10 through 15.
50. What is the primary software application used to locate, access, and display web pages on the World Wide Web called?
- A) Search Engine
- B) Web Browser
- C) Web Server
- D) Hyperlink
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Correct Answer: B) Web Browser
Explanation: A Web Browser (Google Chrome, Mozilla Firefox, Microsoft Edge) is the client-side application that fetches and renders HTML/CSS files from web servers. A Search Engine (Google, Bing) is a website used to find information on the web.