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Computer General Knowledge 2025 Questions and Answer | Previous Year Questions

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Computer General Knowledge

Computer Knowledge MCQs (40 Questions)

1. Fundamentals of Computers

  1. What is the full form of CPU?
    a) Central Processing Unit
    b) Central Program Unit
    c) Computer Processing Unit
    d) Computer Program Unit
    Answer: a) Central Processing Unit

  2. Which of the following is NOT an input device?
    a) Keyboard
    b) Mouse
    c) Printer
    d) Scanner
    Answer: c) Printer

  3. What is the primary function of RAM?
    a) Permanent storage
    b) Temporary storage
    c) Processing data
    d) Displaying output
    Answer: b) Temporary storage

  4. Which of the following is a volatile memory?
    a) ROM
    b) RAM
    c) Hard Disk
    d) SSD
    Answer: b) RAM

  5. What is the binary equivalent of the decimal number 10?
    a) 1010
    b) 1001
    c) 1100
    d) 1111
    Answer: a) 1010

2. Operating Systems

  1. Which of the following is an open-source operating system?
    a) Windows
    b) macOS
    c) Linux
    d) iOS
    Answer: c) Linux

  2. What is the main function of an operating system?
    a) Manage hardware resources
    b) Run applications
    c) Provide a user interface
    d) All of the above
    Answer: d) All of the above

  3. Which operating system is developed by Apple?
    a) Windows
    b) Linux
    c) macOS
    d) Android
    Answer: c) macOS

  4. What is the extension of a batch file in Windows?
    a) .exe
    b) .bat
    c) .txt
    d) .cmd
    Answer: b) .bat

  5. Which of the following is NOT a mobile operating system?
    a) Android
    b) iOS
    c) Windows Phone
    d) Linux Mint
    Answer: d) Linux Mint

3. Programming Concepts

  1. What is the output of print(5 + 3 * 2) in Python?
    a) 16
    b) 11
    c) 10
    d) 13
    Answer: b) 11

  2. Which language is used for web development?
    a) Java
    b) HTML
    c) C++
    d) Python
    Answer: b) HTML

  3. What is the extension of a Python file?
    a) .java
    b) .py
    c) .cpp
    d) .html
    Answer: b) .py

  4. Which of the following is a compiled language?
    a) Python
    b) Java
    c) C++
    d) JavaScript
    Answer: c) C++

  5. What does IDE stand for?
    a) Integrated Development Environment
    b) Internal Development Environment
    c) Integrated Design Environment
    d) Internal Design Environment
    Answer: a) Integrated Development Environment

4. Networking

  1. What is the full form of LAN?
    a) Local Area Network
    b) Large Area Network
    c) Logical Area Network
    d) Linear Area Network
    Answer: a) Local Area Network

  2. Which device is used to connect multiple computers in a network?
    a) Router
    b) Switch
    c) Modem
    d) Hub
    Answer: b) Switch

  3. What is the default IP address for localhost?
    a) 192.168.1.1
    b) 127.0.0.1
    c) 10.0.0.1
    d) 172.16.0.1
    Answer: b) 127.0.0.1

  4. Which protocol is used for sending emails?
    a) HTTP
    b) FTP
    c) SMTP
    d) TCP
    Answer: c) SMTP

  5. What is the full form of DNS?
    a) Domain Name System
    b) Data Name System
    c) Dynamic Name System
    d) Domain Network System
    Answer: a) Domain Name System

5. Databases

  1. What is the full form of SQL?
    a) Structured Query Language
    b) Simple Query Language
    c) Standard Query Language
    d) Sequential Query Language
    Answer: a) Structured Query Language

  2. Which of the following is NOT a relational database?
    a) MySQL
    b) Oracle
    c) MongoDB
    d) PostgreSQL
    Answer: c) MongoDB

  3. What is the primary key in a database?
    a) A unique identifier for a record
    b) A foreign key
    c) A composite key
    d) A secondary key
    Answer: a) A unique identifier for a record

  4. Which command is used to delete a table in SQL?
    a) DELETE
    b) DROP
    c) REMOVE
    d) ERASE
    Answer: b) DROP

  5. What is the extension of a MySQL database file?
    a) .db
    b) .sql
    c) .mdb
    d) .mysql
    Answer: b) .sql

6. Web Technologies

  1. What is the full form of HTML?
    a) HyperText Markup Language
    b) HyperText Machine Language
    c) HyperText Markup Link
    d) HyperText Machine Link
    Answer: a) HyperText Markup Language

  2. Which tag is used to create a hyperlink in HTML?
    a) <link>
    b) <a>
    c) <href>
    d) <hyperlink>
    Answer: b) <a>

  3. What is the full form of CSS?
    a) Computer Style Sheets
    b) Cascading Style Sheets
    c) Creative Style Sheets
    d) Colorful Style Sheets
    Answer: b) Cascading Style Sheets

  4. Which of the following is a front-end framework?
    a) React
    b) Node.js
    c) Django
    d) Flask
    Answer: a) React

  5. What is the full form of URL?
    a) Uniform Resource Locator
    b) Universal Resource Locator
    c) Uniform Resource Link
    d) Universal Resource Link
    Answer: a) Uniform Resource Locator

7. Cybersecurity

  1. What is phishing?
    a) A type of malware
    b) A type of cyber attack to steal sensitive information
    c) A type of hardware failure
    d) A type of network protocol
    Answer: b) A type of cyber attack to steal sensitive information

  2. Which of the following is a strong password?
    a) 123456
    b) Password
    c) P@ssw0rd!
    d) admin
    Answer: c) P@ssw0rd!

  3. What is the full form of VPN?
    a) Virtual Private Network
    b) Virtual Public Network
    c) Verified Private Network
    d) Verified Public Network
    Answer: a) Virtual Private Network

  4. Which of the following is NOT a type of malware?
    a) Virus
    b) Worm
    c) Firewall
    d) Trojan
    Answer: c) Firewall

  5. What is two-factor authentication?
    a) Using two passwords
    b) Using a password and a biometric scan
    c) Using two different networks
    d) Using two firewalls
    Answer: b) Using a password and a biometric scan

8. Miscellaneous

  1. What is the full form of PDF?
    a) Portable Document Format
    b) Printable Document Format
    c) Portable Data Format
    d) Printable Data Format
    Answer: a) Portable Document Format

  2. Which of the following is a cloud storage service?
    a) Google Drive
    b) Dropbox
    c) OneDrive
    d) All of the above
    Answer: d) All of the above

  3. What is the full form of USB?
    a) Universal Serial Bus
    b) Universal System Bus
    c) Unique Serial Bus
    d) Unique System Bus
    Answer: a) Universal Serial Bus

  4. Which of the following is a programming language?
    a) HTML
    b) CSS
    c) JavaScript
    d) XML
    Answer: c) JavaScript

  5. What is the full form of AI?
    a) Artificial Intelligence
    b) Automated Intelligence
    c) Advanced Intelligence
    d) Applied Intelligence
    Answer: a) Artificial Intelligence

    9. Programming and Algorithms

    1. What is the time complexity of a linear search algorithm?
      a) O(1)
      b) O(log n)
      c) O(n)
      d) O(n^2)
      Answer: c) O(n)

    2. Which data structure uses the LIFO principle?
      a) Queue
      b) Stack
      c) Linked List
      d) Tree
      Answer: b) Stack

    3. What is the output of print(2 ** 3) in Python?
      a) 6
      b) 8
      c) 9
      d) 23
      Answer: b) 8

    4. Which of the following is NOT a programming paradigm?
      a) Object-Oriented Programming
      b) Procedural Programming
      c) Functional Programming
      d) Linear Programming
      Answer: d) Linear Programming

    5. What does the len() function do in Python?
      a) Returns the length of a string or list
      b) Converts a string to lowercase
      c) Sorts a list
      d) Reverses a string
      Answer: a) Returns the length of a string or list

    10. Web Development

    1. Which tag is used to create an ordered list in HTML?
      a) <ul>
      b) <ol>
      c) <li>
      d) <dl>
      Answer: b) <ol>

    2. What is the purpose of the <div> tag in HTML?
      a) To create a hyperlink
      b) To define a section in a document
      c) To insert an image
      d) To create a table
      Answer: b) To define a section in a document

    3. Which CSS property is used to change the text color?
      a) font-color
      b) text-color
      c) color
      d) background-color
      Answer: c) color

    4. What is the full form of XML?
      a) Extensible Markup Language
      b) Extended Machine Language
      c) Extensible Machine Language
      d) Extended Markup Language
      Answer: a) Extensible Markup Language

    5. Which of the following is a JavaScript framework?
      a) Django
      b) Flask
      c) Angular
      d) Laravel
      Answer: c) Angular

    11. Networking and Internet

    1. What is the full form of HTTP?
      a) HyperText Transfer Protocol
      b) HyperText Transmission Protocol
      c) HyperText Transfer Process
      d) HyperText Transmission Process
      Answer: a) HyperText Transfer Protocol

    2. Which port is used for HTTPS?
      a) 80
      b) 443
      c) 21
      d) 25
      Answer: b) 443

    3. What is the full form of FTP?
      a) File Transfer Protocol
      b) File Transmission Protocol
      c) File Transfer Process
      d) File Transmission Process
      Answer: a) File Transfer Protocol

    4. Which device connects two different networks?
      a) Switch
      b) Hub
      c) Router
      d) Modem
      Answer: c) Router

    5. What is the full form of MAC address?
      a) Media Access Control
      b) Machine Access Control
      c) Media Address Control
      d) Machine Address Control
      Answer: a) Media Access Control

    12. Databases

    1. Which SQL command is used to insert data into a table?
      a) ADD
      b) INSERT
      c) UPDATE
      d) CREATE
      Answer: b) INSERT

    2. What is the purpose of the WHERE clause in SQL?
      a) To filter records
      b) To sort records
      c) To group records
      d) To join tables
      Answer: a) To filter records

    3. Which of the following is a NoSQL database?
      a) MySQL
      b) PostgreSQL
      c) MongoDB
      d) Oracle
      Answer: c) MongoDB

    4. What is the full form of DBMS?
      a) Database Management System
      b) Data Backup Management System
      c) Database Manipulation System
      d) Data Block Management System
      Answer: a) Database Management System

    5. Which SQL command is used to delete a database?
      a) DELETE
      b) DROP
      c) REMOVE
      d) ERASE
      Answer: b) DROP

    13. Cybersecurity

    1. What is the purpose of a firewall?
      a) To block unauthorized access
      b) To speed up internet connectivity
      c) To store data
      d) To encrypt data
      Answer: a) To block unauthorized access

    2. Which of the following is an example of symmetric encryption?
      a) RSA
      b) AES
      c) SSL
      d) TLS
      Answer: b) AES

    3. What is the full form of SSL?
      a) Secure Socket Layer
      b) Secure System Layer
      c) Secure Server Layer
      d) Secure Software Layer
      Answer: a) Secure Socket Layer

    4. Which of the following is a type of cyber attack?
      a) Phishing
      b) Spoofing
      c) DDoS
      d) All of the above
      Answer: d) All of the above

    5. What is the purpose of antivirus software?
      a) To detect and remove malware
      b) To improve internet speed
      c) To encrypt data
      d) To create backups
      Answer: a) To detect and remove malware

    14. Emerging Technologies

    1. What is the full form of IoT?
      a) Internet of Things
      b) Internet of Technology
      c) Internet of Tools
      d) Internet of Tasks
      Answer: a) Internet of Things

    2. Which of the following is an example of IoT?
      a) Smartwatch
      b) Smart TV
      c) Smart Refrigerator
      d) All of the above
      Answer: d) All of the above

    3. What is the full form of AI?
      a) Artificial Intelligence
      b) Automated Intelligence
      c) Advanced Intelligence
      d) Applied Intelligence
      Answer: a) Artificial Intelligence

    4. Which of the following is a programming language used in AI?
      a) Python
      b) Java
      c) C++
      d) All of the above
      Answer: d) All of the above

    5. What is the full form of VR?
      a) Virtual Reality
      b) Visual Reality
      c) Virtual Response
      d) Visual Response
      Answer: a) Virtual Reality

    15. Miscellaneous

    1. What is the full form of BIOS?
      a) Basic Input Output System
      b) Binary Input Output System
      c) Basic Integrated Operating System
      d) Binary Integrated Operating System
      Answer: a) Basic Input Output System

    2. Which of the following is a high-level programming language?
      a) Assembly
      b) Python
      c) Machine Language
      d) Binary Code
      Answer: b) Python

    3. What is the full form of GUI?
      a) Graphical User Interface
      b) General User Interface
      c) Graphical Unified Interface
      d) General Unified Interface
      Answer: a) Graphical User Interface

    4. Which of the following is a version control system?
      a) Git
      b) SVN
      c) Mercurial
      d) All of the above
      Answer: d) All of the above

    5. What is the full form of API?
      a) Application Programming Interface
      b) Advanced Programming Interface
      c) Application Protocol Interface
      d) Advanced Protocol Interface
      Answer: a) Application Programming Interface

      16. Cloud Computing

      1. What is the full form of SaaS?
        a) Software as a Service
        b) System as a Service
        c) Storage as a Service
        d) Security as a Service
        Answer: a) Software as a Service

      2. Which of the following is a cloud service provider?
        a) AWS
        b) Microsoft Azure
        c) Google Cloud
        d) All of the above
        Answer: d) All of the above

      3. What is the full form of IaaS?
        a) Infrastructure as a Service
        b) Internet as a Service
        c) Integration as a Service
        d) Information as a Service
        Answer: a) Infrastructure as a Service

      4. Which cloud model provides both hardware and software resources?
        a) Public Cloud
        b) Private Cloud
        c) Hybrid Cloud
        d) Community Cloud
        Answer: c) Hybrid Cloud

      5. What is the full form of PaaS?
        a) Platform as a Service
        b) Program as a Service
        c) Process as a Service
        d) Protocol as a Service
        Answer: a) Platform as a Service

      17. Data Structures

      1. Which data structure uses the FIFO principle?
        a) Stack
        b) Queue
        c) Linked List
        d) Tree
        Answer: b) Queue

      2. What is the time complexity of a binary search algorithm?
        a) O(1)
        b) O(log n)
        c) O(n)
        d) O(n^2)
        Answer: b) O(log n)

      3. Which of the following is a linear data structure?
        a) Array
        b) Tree
        c) Graph
        d) Heap
        Answer: a) Array

      4. What is the maximum number of children a binary tree node can have?
        a) 1
        b) 2
        c) 3
        d) 4
        Answer: b) 2

      5. Which data structure is used for implementing recursion?
        a) Queue
        b) Stack
        c) Linked List
        d) Tree
        Answer: b) Stack

      18. Operating Systems

      1. What is the main purpose of an operating system?
        a) To manage hardware resources
        b) To provide a user interface
        c) To run applications
        d) All of the above
        Answer: d) All of the above

      2. Which scheduling algorithm allocates CPU to the process with the shortest burst time?
        a) FCFS
        b) SJF
        c) Round Robin
        d) Priority Scheduling
        Answer: b) SJF (Shortest Job First)

      3. What is the full form of PCB in operating systems?
        a) Process Control Block
        b) Program Control Block
        c) Process Communication Block
        d) Program Communication Block
        Answer: a) Process Control Block

      4. Which of the following is NOT a state in the process lifecycle?
        a) Running
        b) Waiting
        c) Terminated
        d) Hibernating
        Answer: d) Hibernating

      5. What is the purpose of virtual memory?
        a) To extend RAM using disk space
        b) To speed up the CPU
        c) To store permanent data
        d) To manage input/output operations
        Answer: a) To extend RAM using disk space

      19. Computer Hardware

      1. Which component is known as the brain of the computer?
        a) RAM
        b) CPU
        c) Hard Disk
        d) Motherboard
        Answer: b) CPU

      2. What is the full form of GPU?
        a) Graphics Processing Unit
        b) General Processing Unit
        c) Graphical Performance Unit
        d) General Performance Unit
        Answer: a) Graphics Processing Unit

      3. Which of the following is a secondary storage device?
        a) RAM
        b) ROM
        c) Hard Disk
        d) Cache Memory
        Answer: c) Hard Disk

      4. What is the purpose of a motherboard?
        a) To connect all hardware components
        b) To store data
        c) To process data
        d) To display output
        Answer: a) To connect all hardware components

      5. Which port is used to connect a monitor to a computer?
        a) USB
        b) HDMI
        c) Ethernet
        d) VGA
        Answer: b) HDMI

      20. Software Development Life Cycle (SDLC)

      1. Which phase of SDLC involves gathering requirements?
        a) Design
        b) Analysis
        c) Implementation
        d) Testing
        Answer: b) Analysis

      2. What is the purpose of the testing phase in SDLC?
        a) To identify and fix bugs
        b) To gather requirements
        c) To design the system
        d) To deploy the system
        Answer: a) To identify and fix bugs

      3. Which SDLC model follows a linear and sequential approach?
        a) Agile
        b) Waterfall
        c) Spiral
        d) Iterative
        Answer: b) Waterfall

      4. What is the full form of UML?
        a) Unified Modeling Language
        b) Universal Modeling Language
        c) Unified Machine Language
        d) Universal Machine Language
        Answer: a) Unified Modeling Language

      5. Which of the following is NOT a phase in SDLC?
        a) Planning
        b) Maintenance
        c) Execution
        d) Deployment
        Answer: c) Execution

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