Computer Science
Multiple Choice
Questions
(MCQs) – Sets 10
with Detailed Explanations
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SET 10 – Computer Science MCQs
✅ No repetition from Sets 1–9
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is a byte?
A. A programming language
B. A unit of memory consisting of 8 bits
C. A storage device
D. An input device
✅ Correct Answer: B
Explanation:
A byte is a basic unit of digital information made up of 8 bits. It is commonly used to represent a single character such as a letter or number. For example, the letter “A” is stored as one byte. Memory sizes like kilobytes and megabytes are based on bytes.
2. What is the purpose of a device driver?
A. Store data
B. Run applications
C. Allow hardware to communicate with the operating system
D. Protect against viruses
✅ Correct Answer: C
Explanation:
A device driver is software that helps the operating system communicate with hardware devices such as printers, scanners, and graphic cards. Without drivers, the operating system would not understand how to use the hardware. Drivers ensure proper functioning and allow devices to perform their tasks correctly.
3. What is virtualization?
A. Formatting storage
B. Creating virtual versions of computing resources
C. Installing software
D. Deleting programs
✅ Correct Answer: B
Explanation:
Virtualization is a technology that allows multiple virtual computers to run on a single physical machine. Each virtual machine behaves like a real computer with its own operating system. Virtualization improves resource usage and is widely used in cloud computing, data centers, and software testing environments.
4. What is a supercomputer mainly used for?
A. Playing games
B. Office work
C. Complex scientific calculations
D. Web browsing
✅ Correct Answer: C
Explanation:
A supercomputer is an extremely powerful computer used for complex calculations and large data processing. It is used in weather forecasting, space research, nuclear simulations, and scientific research. Supercomputers can perform millions of calculations per second, making them suitable for tasks beyond ordinary computers.
5. What is a software license?
A. A computer virus
B. A legal permission to use software
C. A programming tool
D. A storage device
✅ Correct Answer: B
Explanation:
A software license is a legal agreement that allows users to use software under certain conditions. It defines rights and restrictions such as copying, sharing, or modifying software. Licensed software ensures legal and ethical use, protecting developers’ rights and preventing software piracy.
6. What is the function of an operating system scheduler?
A. Manage files
B. Control printers
C. Decide which process runs next
D. Install software
✅ Correct Answer: C
Explanation:
The scheduler is a part of the operating system that decides which process gets access to the CPU and when. It ensures fair and efficient use of processor time among multiple programs. Scheduling improves system performance and enables multitasking by managing process execution order.
7. What is a data warehouse?
A. Temporary memory
B. A collection of raw data files
C. A system for storing large amounts of analyzed data
D. A computer virus
✅ Correct Answer: C
Explanation:
A data warehouse is a centralized system used to store large volumes of structured data collected from different sources. It supports data analysis and reporting. Businesses use data warehouses to analyze trends, make decisions, and plan strategies based on historical and current data.
8. What is a QR code?
A. A programming language
B. A type of barcode that stores digital information
C. A network protocol
D. A storage device
✅ Correct Answer: B
Explanation:
A QR code (Quick Response code) is a two-dimensional barcode that stores information such as website links or contact details. It can be scanned using smartphones. QR codes are widely used in digital payments, advertisements, and product information due to their fast and easy accessibility.
9. What is cyberbullying?
A. Online shopping
B. Learning programming
C. Harassing someone using digital platforms
D. Installing software
✅ Correct Answer: C
Explanation:
Cyberbullying involves using digital platforms like social media, messaging apps, or emails to harass, threaten, or embarrass someone. It can have serious emotional effects. Preventing cyberbullying requires responsible online behavior, awareness, and reporting harmful activities to authorities or platforms.
10. What is data compression?
A. Increasing file size
B. Converting files to images
C. Reducing file size
D. Deleting data
✅ Correct Answer: C
Explanation:
Data compression is the process of reducing the size of files to save storage space and speed up data transfer. Examples include ZIP files and compressed images. Compression helps send files faster over the internet and allows more data to be stored in limited storage devices.
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