Computer Science
Multiple Choice
Questions
(MCQs) – Sets 28
with Detailed Explanations
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SET 28 – Computer Science MCQs
✅ No repetition from Sets 1–27
✅ 10 completely new questions
✅ Each explanation is 50+ words
Level: Class 9–10 / Beginners
1. What is a LAN (Local Area Network)?
A. Worldwide network
B. Network within a small area
C. Wireless network only
D. Network for mobile phones
✅ Correct Answer: B
Explanation:
A LAN is a network that covers a small geographical area such as a home, school, or office. It allows devices to share files, printers, and internet connections. LANs offer high speed, low cost, and are commonly used in educational and business environments.
2. What is a WAN (Wide Area Network)?
A. Home network
B. School network
C. Network covering large geographical areas
D. Bluetooth network
✅ Correct Answer: C
Explanation:
A WAN spans a large geographical area, often connecting cities, countries, or continents. The internet is the largest example of a WAN. WANs use various communication technologies like fiber optics and satellites to enable long-distance data transmission.
3. What is a MAN (Metropolitan Area Network)?
A. Personal network
B. Network within a city
C. Home network
D. Private network
✅ Correct Answer: B
Explanation:
A MAN covers a city or large campus area. It is larger than a LAN but smaller than a WAN. MANs are often used by organizations or governments to connect multiple buildings within a city for efficient data sharing.
4. What is a PAN (Personal Area Network)?
A. Global network
B. City network
C. Small network around an individual
D. Office network
✅ Correct Answer: C
Explanation:
A PAN is a small network used by an individual to connect personal devices such as smartphones, laptops, and headphones. Technologies like Bluetooth and USB are commonly used. PANs are simple, low-cost, and support personal data sharing.
5. What is network topology?
A. Network speed
B. Network security
C. Physical or logical layout of a network
D. Internet service
✅ Correct Answer: C
Explanation:
Network topology refers to the arrangement of devices and cables in a network. Common topologies include star, bus, ring, and mesh. Choosing the right topology affects performance, cost, and reliability of the network.
6. What is star topology?
A. Devices connected in a circle
B. Single cable connection
C. Devices connected to a central hub
D. Wireless network
✅ Correct Answer: C
Explanation:
In star topology, all devices are connected to a central hub or switch. It is easy to install and manage. If one device fails, others continue to work. However, if the central hub fails, the entire network may stop functioning.
7. What is bus topology?
A. Central device connection
B. Circular connection
C. Single backbone cable
D. Wireless connection
✅ Correct Answer: C
Explanation:
Bus topology uses a single main cable called a backbone to which all devices are connected. It is simple and cost-effective for small networks. However, if the main cable fails, the entire network stops working.
8. What is ring topology?
A. Central hub
B. Single backbone
C. Devices connected in a circular manner
D. Wireless only
✅ Correct Answer: C
Explanation:
In ring topology, devices are connected in a circular loop. Data travels in one direction around the ring. While it provides equal access, failure of one device or cable can disrupt the entire network unless special protection methods are used.
9. What is mesh topology?
A. Single cable network
B. Centralized network
C. Devices interconnected with multiple paths
D. Wireless network
✅ Correct Answer: C
Explanation:
Mesh topology connects devices with multiple pathways, providing high reliability and fault tolerance. If one path fails, data can take another route. Although expensive and complex, mesh topology is used in critical networks requiring high availability.
10. What is a hybrid topology?
A. One topology only
B. Wireless topology
C. Combination of two or more topologies
D. Temporary network
✅ Correct Answer: C
Explanation:
Hybrid topology combines two or more network topologies to meet specific requirements. It offers flexibility, scalability, and improved performance. Hybrid networks are common in large organizations where different departments have different networking needs
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