Computer Science
Multiple Choice
Questions
(MCQs) – Sets 2
with Detailed Explanations
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SET 2 – Computer Science MCQs (10 Questions with Answers & examples)
Level is suitable for Class 9–10 / beginners.
1. What is hardware?
A. Programs of a computer
B. Physical parts of a computer
C. Internet services
D. Data files
✅ Correct Answer: B
Explanation:
Hardware refers to the physical components of a computer that we can see and touch. Examples include the keyboard, mouse, monitor, CPU, printer, and hard disk. Without hardware, software cannot run. Hardware works together with software to perform tasks like typing documents, printing files, and browsing the internet.
2. Which device is used to display output?
A. Keyboard
B. Mouse
C. Monitor
D. Scanner
✅ Correct Answer: C
Explanation:
A monitor is an output device used to display information processed by the computer. It shows text, images, videos, and graphics. For example, when you type in a document or watch a video, the results are displayed on the monitor. It helps users visually interact with the computer.
3. What is an operating system?
A. A type of hardware
B. A computer game
C. System software
D. Input device
✅ Correct Answer: C
Explanation:
An operating system is system software that controls the overall operation of the computer. It manages hardware resources like CPU, memory, and storage. Examples include Windows, Linux, and macOS. It allows users to run applications, manage files, and interact with the computer easily.
4. Which of the following is NOT an input device?
A. Mouse
B. Keyboard
C. Scanner
D. Printer
✅ Correct Answer: D
Explanation:
A printer is an output device, not an input device. Input devices are used to enter data into the computer, such as keyboard, mouse, and scanner. A printer produces hard copies of documents. For example, when you print notes or images, the printer gives the final output on paper.
5. What does ALU stand for?
A. Automatic Logic Unit
B. Arithmetic Logic Unit
C. Advanced Logic Unit
D. Access Logic Unit
✅ Correct Answer: B
Explanation:
ALU stands for Arithmetic Logic Unit. It is a part of the CPU responsible for performing arithmetic operations like addition and subtraction, and logical operations like comparison. For example, when calculating marks or comparing values in a program, the ALU performs these tasks efficiently.
6. Which memory is permanent?
A. RAM
B. Cache
C. ROM
D. Register
✅ Correct Answer: C
Explanation:
ROM (Read Only Memory) is permanent memory that stores essential instructions needed to start the computer. Data in ROM is not erased when the power is turned off. For example, it contains booting instructions. Unlike RAM, ROM ensures the computer starts properly every time.
7. What is the full form of GUI?
A. Graphical User Interface
B. General User Interface
C. Global User Internet
D. Graphic Utility Interface
✅ Correct Answer: A
Explanation:
GUI stands for Graphical User Interface. It allows users to interact with the computer using icons, windows, buttons, and menus. For example, clicking icons on Windows desktop is part of GUI. It makes computers easy to use, especially for beginners, compared to text-based interfaces.
8. Which of the following is application software?
A. Windows
B. Linux
C. MS Excel
D. Device Driver
✅ Correct Answer: C
Explanation:
MS Excel is application software used for creating spreadsheets, calculations, and data analysis. Application software helps users perform specific tasks. Other examples include MS Word and PowerPoint. Unlike system software, application software depends on the operating system to function properly.
9. What is data?
A. Processed information
B. Meaningful output
C. Raw facts and figures
D. Instructions
✅ Correct Answer: C
Explanation:
Data consists of raw facts and figures that have no meaning on their own. For example, numbers like 75 or names without context are data. When data is processed and organized, it becomes information. Computers process data to produce useful information for decision-making.
10. What is the function of a mouse?
A. Typing text
B. Displaying output
C. Pointing and selecting items
D. Printing documents
✅ Correct Answer: C
Explanation:
A mouse is an input device used to point, click, drag, and select items on the screen. For example, opening files, selecting text, and navigating menus are done using a mouse. It makes interaction with graphical user interfaces easier and faster compared to using only a keyboard.
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