20 Most Repeated Computer Fundamentals MCQs for NTS, CSS, PMS, KPPSC, PPSC, ETEA, SPSC, BPSC and FPSC Exams

Here are 20 most repeated Computer Fundamentals MCQs, complete with correct answers and explanations, formatted perfectly for inclusion in test preparation materials for competitive exams like NTS, CSS, PMS, PPSC, and FPSC.

Most Repeated Computer Fundamentals MCQs

1. Which of the following is considered the "brain" of a computer system?
A) Arithmetic Logic Unit (ALU)
B) Control Unit
C) Central Processing Unit (CPU)
D) Random Access Memory (RAM)

Correct Answer: C) Central Processing Unit (CPU)
Explanation: The CPU is the primary component of a computer that acts as its "brain." It processes instructions, executes calculations, and manages the flow of information through a computer system.

2. Which of the following is an example of volatile memory?
A) ROM
B) Hard Disk Drive
C) RAM
D) Flash Drive

Correct Answer: C) RAM
Explanation: RAM (Random Access Memory) is volatile, meaning it requires continuous power to retain its data. When the computer is turned off, all data stored in RAM is lost.

3. What does "GUI" stand for in computing?
A) General Utility Interface
B) Graphical User Interface
C) Global Unique Identifier
D) Graphical Utility Interaction

Correct Answer: B) Graphical User Interface
Explanation: A GUI allows users to interact with electronic devices through graphical icons and visual indicators, as opposed to text-based interfaces or typed command labels.

4. The smallest unit of data in a computer is a:
A) Byte
B) Nibble
C) Bit
D) Kilobyte

Correct Answer: C) Bit
Explanation: A bit (binary digit) is the most basic unit of information in computing and digital communications. It can have only one of two values: 0 or 1. (Note: 4 bits make a nibble, and 8 bits make a byte).

5. Which protocol is primarily used to browse the World Wide Web?
A) FTP
B) SMTP
C) HTTP
D) TCP/IP

Correct Answer: C) HTTP
Explanation: HTTP (Hypertext Transfer Protocol) is the foundation of data communication for the World Wide Web. It defines how messages are formatted and transmitted between web browsers and servers.

6. Who is widely recognized as the "Father of the Computer"?
A) Alan Turing
B) Charles Babbage
C) John von Neumann
D) Bill Gates

Correct Answer: B) Charles Babbage
Explanation: Charles Babbage, an English polymath, originated the concept of a digital programmable computer and designed the Analytical Engine in the 1830s.

7. Which component is directly responsible for performing mathematical calculations and logical operations?
A) Control Unit
B) Register
C) Motherboard
D) Arithmetic Logic Unit (ALU)

Correct Answer: D) Arithmetic Logic Unit (ALU)
Explanation: The ALU is a crucial part of the CPU. It handles all arithmetic (addition, subtraction) and logical (AND, OR, NOT) operations required during data processing.

8. Software that acts as a bridge between the computer hardware and the user is called:
A) Application Software
B) Utility Software
C) Operating System
D) Firmware

Correct Answer: C) Operating System
Explanation: An Operating System (like Windows, Linux, or macOS) manages computer hardware, software resources, and provides common services for computer programs.

9. Cache memory is located between the:
A) CPU and RAM
B) RAM and ROM
C) Hard Disk and RAM
D) CPU and Hard Disk

Correct Answer: A) CPU and RAM
Explanation: Cache is an extremely fast memory type that acts as a buffer between RAM and the CPU. It holds frequently requested data and instructions so that they are immediately available to the CPU when needed.

10. What does the term "Phishing" refer to in computer security?
A) A virus that deletes files
B) Attempting to acquire sensitive information by masquerading as a trustworthy entity
C) Unauthorized access to a local network
D) Bypassing firewall protocols

Correct Answer: B) Attempting to acquire sensitive information by masquerading as a trustworthy entity
Explanation: Phishing is a cyberattack that uses disguised email or messaging as a weapon to trick the recipient into revealing personal information like passwords or credit card numbers.

11. In MS Word, what is the shortcut key to "Undo" the last action?
A) Ctrl + Y
B) Ctrl + Z
C) Ctrl + U
D) Ctrl + X

Correct Answer: B) Ctrl + Z
Explanation: Ctrl + Z is the universal keyboard shortcut in Windows environments to undo the previous action. Ctrl + Y is typically used to "Redo."

12. Which of the following is NOT an input device?
A) Scanner
B) Microphone
C) Projector
D) Keyboard

Correct Answer: C) Projector
Explanation: A projector is an output device that takes images generated by a computer and projects them onto a screen or surface. Scanners, microphones, and keyboards all send data *into* the computer.

13. The first general-purpose electronic digital computer was:
A) UNIVAC
B) EDVAC
C) ENIAC
D) Abacus

Correct Answer: C) ENIAC
Explanation: ENIAC (Electronic Numerical Integrator and Computer), completed in 1945, was the first programmable, electronic, general-purpose digital computer.

14. What does LAN stand for?
A) Local Area Network
B) Logical Area Network
C) Large Area Network
D) Local Access Node

Correct Answer: A) Local Area Network
Explanation: A LAN is a computer network that interconnects computers within a limited geographic area, such as a residence, school, laboratory, university campus, or office building.

15. Which of the following extensions is typically used for a Microsoft Excel workbook?
A) .docx
B) .pptx
C) .pdf
D) .xlsx

Correct Answer: D) .xlsx
Explanation: The .xlsx extension is the default format for Microsoft Excel workbooks introduced with Office 2007, replacing the older .xls format.

16. IP Address stands for:
A) Internet Protocol Address
B) Intranet Protocol Address
C) Internal Process Address
D) Internet Provider Address

Correct Answer: A) Internet Protocol Address
Explanation: An IP address is a unique numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication.

17. Which of the following is open-source software?
A) Microsoft Windows
B) Adobe Photoshop
C) Linux
D) Microsoft Office

Correct Answer: C) Linux
Explanation: Linux is an open-source operating system, meaning its source code is freely available to the public to use, modify, and distribute. The others are proprietary, closed-source software.

18. Unsolicited commercial emails are commonly referred to as:
A) Malware
B) Spam
C) Adware
D) Trojans

Correct Answer: B) Spam
Explanation: Spam refers to the use of electronic messaging systems to send unsolicited bulk messages, especially advertising, indiscriminately.

19. What is the primary function of a router in a network?
A) To protect the network from viruses
B) To connect multiple networks and forward data packets between them
C) To provide power to network devices
D) To convert digital signals to analog signals

Correct Answer: B) To connect multiple networks and forward data packets between them
Explanation: A router acts as a dispatcher, choosing the best path for data packets to travel across networks to reach their destination.

20. Who invented the World Wide Web (WWW)?
A) Vint Cerf
B) Steve Jobs
C) Tim Berners-Lee
D) Larry Page

Correct Answer: C) Tim Berners-Lee
Explanation: Sir Tim Berners-Lee, an English computer scientist, invented the World Wide Web in 1989 while working at CERN to help scientists share data globally.