Computer Science
Multiple Choice
Questions
(MCQs) – Sets 50
with Detailed Explanations
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SET 50 – Computer Science MCQs
✅ No repetition from Sets 1–49
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is a computer network?
A. Single computer system
B. Collection of software
C. Group of interconnected computers
D. Input device
✅ Correct Answer: C
Explanation:
A computer network is a group of computers and devices connected together to share data, resources, and information. Networks allow users to share files, printers, and internet connections. Examples include LAN, MAN, and WAN, which differ based on geographical coverage.
2. What is LAN?
A. Large Area Network
B. Logical Area Network
C. Local Area Network
D. Long Area Network
✅ Correct Answer: C
Explanation:
LAN stands for Local Area Network. It connects computers within a small area like a school, office, or home. LANs offer high-speed data transfer and are cost-effective. They are commonly used for sharing files and printers.
3. What is WAN?
A. Wireless Area Network
B. Wide Area Network
C. Web Area Network
D. Wired Area Network
✅ Correct Answer: B
Explanation:
WAN stands for Wide Area Network. It covers a large geographical area such as cities or countries. The internet is the best example of a WAN. WANs allow long-distance communication and data sharing across the world.
4. What is internet?
A. Single network
B. Collection of documents
C. Global network of networks
D. Application software
✅ Correct Answer: C
Explanation:
The internet is a global system of interconnected computer networks. It enables communication, information sharing, online services, and multimedia access worldwide. Services like email, websites, and cloud computing depend on the internet.
5. What is intranet?
A. Public network
B. Internet service
C. Private internal network
D. Social media
✅ Correct Answer: C
Explanation:
An intranet is a private network used within an organization. It uses internet technologies but is accessible only to authorized users. Intranets improve internal communication, collaboration, and secure information sharing.
6. What is protocol?
A. Hardware part
B. Programming language
C. Set of rules for communication
D. Network cable
✅ Correct Answer: C
Explanation:
A protocol is a set of rules that govern data communication between devices in a network. Protocols ensure data is sent, received, and understood correctly. Examples include TCP/IP, HTTP, and FTP.
7. What is IP address?
A. Software name
B. Computer password
C. Unique identification number for device
D. Network cable
✅ Correct Answer: C
Explanation:
An IP address is a unique numerical label assigned to each device on a network. It helps identify devices and enables data routing. IP addresses ensure correct delivery of information across networks.
8. What is web browser?
A. Search engine
B. System software
C. Software to access websites
D. Programming tool
✅ Correct Answer: C
Explanation:
A web browser is application software used to access and view websites on the internet. Browsers interpret web pages and display text, images, and videos. Examples include Chrome, Firefox, and Edge.
9. What is email?
A. Hardware device
B. Offline message
C. Electronic mail service
D. Programming command
✅ Correct Answer: C
Explanation:
Email is an electronic mail service that allows users to send and receive messages over the internet. It is fast, cost-effective, and widely used for personal and professional communication worldwide.
10. What is cyber security?
A. Computer repair
B. Network speed
C. Protection of systems and data
D. Software installation
✅ Correct Answer: C
Explanation:
Cyber security involves protecting computer systems, networks, and data from digital attacks, unauthorized access, and damage. It includes practices like antivirus protection, firewalls, and secure passwords to ensure safe computing.
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