Computer Science
Multiple Choice
Questions
(MCQs) – Sets 36
with Detailed Explanations
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SET 36 – Computer Science MCQs
✅ No repetition from Sets 1–35
✅ 10 completely new questions
✅ Each explanation is 50+ words
Level: Class 9–10 / Beginners
1. What is a computer network?
A. Single computer
B. Group of connected computers
C. Software program
D. Hardware device
✅ Correct Answer: B
Explanation:
A computer network is a collection of two or more computers connected together to share data, resources, and services. Networks allow users to communicate, share files, printers, and internet connections efficiently. Examples include school networks and the internet.
2. What is LAN?
A. Large Area Network
B. Long Area Network
C. Local Area Network
D. Logical Area Network
✅ Correct Answer: C
Explanation:
LAN stands for Local Area Network. It connects computers within a small geographical area such as a home, school, or office. LANs are fast, secure, and commonly used to share resources like printers and files.
3. What is WAN?
A. Wide Area Network
B. Wireless Access Network
C. Web Area Network
D. World Area Network
✅ Correct Answer: A
Explanation:
WAN stands for Wide Area Network. It covers a large geographical area such as cities or countries. The internet is the largest example of a WAN. WANs enable long-distance communication between computers.
4. What is a modem?
A. Storage device
B. Input device
C. Device that converts digital and analog signals
D. Output device
✅ Correct Answer: C
Explanation:
A modem converts digital data from a computer into analog signals for transmission and converts received analog signals back into digital form. It allows computers to communicate over telephone lines or internet connections.
5. What is bandwidth?
A. Network cable
B. Data storage
C. Maximum data transfer capacity
D. Network error
✅ Correct Answer: C
Explanation:
Bandwidth refers to the maximum amount of data that can be transmitted over a network in a given time. Higher bandwidth means faster data transfer. It is usually measured in bits per second (bps).
6. What is a router?
A. Storage device
B. Connects different networks
C. Input device
D. Output device
✅ Correct Answer: B
Explanation:
A router is a networking device that connects multiple networks and directs data packets between them. It helps connect a local network to the internet and ensures data reaches the correct destination efficiently.
7. What is IP address?
A. Password
B. Network name
C. Unique identification of a device
D. File format
✅ 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 for communication. IP addresses are essential for sending and receiving data across networks.
8. What is protocol?
A. Hardware tool
B. Software error
C. Set of rules for communication
D. Network cable
✅ Correct Answer: C
Explanation:
A protocol is a set of rules that governs how data is transmitted and received over a network. Protocols ensure reliable and standardized communication between devices. Examples include TCP/IP and HTTP.
9. What is firewall?
A. Virus
B. Network cable
C. Security system for network
D. Database
✅ Correct Answer: C
Explanation:
A firewall is a security system that monitors and controls incoming and outgoing network traffic. It protects computers from unauthorized access, hackers, and malware by allowing or blocking data based on security rules.
10. What is packet switching?
A. Data storage method
B. Data encryption
C. Data sent in small packets
D. Network error
✅ Correct Answer: C
Explanation:
Packet switching is a method of data transmission where information is broken into small packets. Each packet travels independently to its destination and is reassembled. This method improves efficiency and reliability in networks like the internet.
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