Computer Science
Multiple Choice
Questions
(MCQs) – Sets 5
with Detailed Explanations
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SET 5 – Computer Science MCQs
✅ No repetition from Sets 1–4
✅ 10 brand-new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is cloud computing?
A. Using computers only offline
B. Storing data only on hard disks
C. Using internet-based services for storage and computing
D. A type of computer virus
✅ Correct Answer: C
Explanation:
Cloud computing refers to using internet-based services to store data, run software, and process information instead of using local computers only. Examples include Google Drive, Dropbox, and online email services. Cloud computing allows users to access data anytime, anywhere, and reduces the need for large physical storage devices.
2. What is a database?
A. A computer virus
B. A collection of related data
C. A hardware device
D. An input method
✅ Correct Answer: B
Explanation:
A database is an organized collection of related data that can be easily accessed, managed, and updated. For example, a school database stores student names, roll numbers, and marks. Databases help store large amounts of information efficiently and are widely used in banks, hospitals, and organizations.
3. What is a cell in a spreadsheet?
A. A row
B. A column
C. The intersection of a row and a column
D. A worksheet
✅ Correct Answer: C
Explanation:
A cell is the smallest unit in a spreadsheet and is formed where a row and a column intersect. For example, cell A1 refers to column A and row 1. Cells are used to enter data such as numbers, text, and formulas. Spreadsheet software like MS Excel uses cells for calculations and data analysis.
4. What does ASCII stand for?
A. Advanced System Code for Information
B. American Standard Code for Information Interchange
C. Automatic System Code for Internet
D. Applied Standard Computer Interface
✅ Correct Answer: B
Explanation:
ASCII stands for American Standard Code for Information Interchange. It is a character encoding system used to represent letters, numbers, and symbols in computers. For example, each character like ‘A’ or ‘1’ has a unique ASCII code. This helps computers store and exchange text data consistently.
5. What is an IP address?
A. A software license
B. A computer name
C. A unique identifier for devices on a network
D. An input device
✅ Correct Answer: C
Explanation:
An IP address is a unique numerical label assigned to each device connected to a network. It helps identify and locate devices on the internet or local network. For example, when you open a website, your IP address helps servers send data back to your computer correctly.
6. What is a firewall?
A. A type of virus
B. A security system
C. An output device
D. A programming language
✅ Correct Answer: B
Explanation:
A firewall is a security system that monitors and controls incoming and outgoing network traffic. It protects computers from unauthorized access and cyber threats. Firewalls can be hardware or software-based. For example, they block harmful websites or hackers from accessing private data on a network.
7. What is open-source software?
A. Software that cannot be modified
B. Paid software only
C. Software with source code available to users
D. Software without updates
✅ Correct Answer: C
Explanation:
Open-source software is software whose source code is freely available for users to view, modify, and distribute. Examples include Linux and Mozilla Firefox. It encourages collaboration and learning. Open-source software is often free and allows developers to improve programs according to their needs.
8. What is data backup?
A. Deleting files
B. Copying data for safety
C. Formatting a disk
D. Compressing files
✅ Correct Answer: B
Explanation:
Data backup means creating copies of important data to protect against loss due to system failure, viruses, or accidental deletion. Backups can be stored on external drives or cloud storage. For example, backing up school projects ensures they can be recovered if the computer crashes.
9. What is multimedia?
A. Text only
B. Numbers only
C. Combination of text, audio, video, and images
D. Programming code
✅ Correct Answer: C
Explanation:
Multimedia refers to the use of multiple forms of media such as text, images, audio, video, and animations together. Examples include educational videos, presentations, and games. Multimedia makes learning more interactive and engaging and is widely used in education, entertainment, and advertising.
10. What are computer ethics?
A. Computer parts
B. Rules for programming
C. Moral guidelines for using computers responsibly
D. Network protocols
✅ Correct Answer: C
Explanation:
Computer ethics are moral principles that guide the proper use of computers and technology. They include respecting privacy, avoiding plagiarism, not spreading viruses, and using software legally. Following computer ethics helps create a safe and responsible digital environment for individuals and society.
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