Computer Science
Multiple Choice
Questions
(MCQs) – Sets 27
with Detailed Explanations
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SET 27 – Computer Science MCQs
✅ No repetition from Sets 1–26
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is a computer network?
A. Single computer
B. Software program
C. Group of interconnected computers
D. Printer
✅ Correct Answer: C
Explanation:
A computer network is a collection of computers and devices connected together to share resources, data, and information. Networks allow communication through wired or wireless connections. Examples include local area networks in schools and offices and the internet, which is the largest network.
2. What is a node in a network?
A. Network cable
B. Any device connected to a network
C. Server room
D. Internet browser
✅ Correct Answer: B
Explanation:
A node is any device connected to a network, such as computers, printers, servers, or smartphones. Nodes can send, receive, or forward data. Each node has a unique identity, often represented by an IP address, enabling communication within the network.
3. What is bandwidth?
A. Network security
B. Data storage
C. Maximum data transfer capacity
D. Cable length
✅ 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 allows faster data transfer. It is usually measured in bits per second. Bandwidth affects internet speed and network performance.
4. What is latency?
A. Data size
B. Network speed
C. Delay in data transmission
D. File format
✅ Correct Answer: C
Explanation:
Latency is the time delay between sending and receiving data over a network. Low latency means faster response times, which is important for online gaming, video calls, and real-time applications. High latency can cause lag and poor network performance.
5. What is packet switching?
A. Hardware switching
B. Circuit connection
C. Data divided into packets for transmission
D. File deletion
✅ Correct Answer: C
Explanation:
Packet switching is a method where data is broken into small packets before transmission. Each packet may take a different path to reach the destination and is reassembled at the receiver. This method improves efficiency and reliability in modern networks like the internet.
6. What is an IP address?
A. Website name
B. Hardware part
C. Unique numerical network identifier
D. Software license
✅ Correct Answer: C
Explanation:
An IP address is a unique number assigned to each device on a network to identify it. It enables devices to locate and communicate with each other. IP addresses can be IPv4 or IPv6 and are essential for internet communication.
7. What is a MAC address?
A. Software key
B. User name
C. Unique hardware address of network device
D. Internet protocol
✅ Correct Answer: C
Explanation:
A MAC address is a permanent hardware address assigned to a network interface card (NIC). It uniquely identifies devices on a local network. Unlike IP addresses, MAC addresses are fixed and used mainly within local networks for communication.
8. What is a router?
A. Storage device
B. Software program
C. Device that directs data between networks
D. Printer
✅ Correct Answer: C
Explanation:
A router is a networking device that forwards data packets between different networks. It connects local networks to the internet and chooses the best path for data transmission. Routers play a crucial role in managing network traffic efficiently.
9. What is a switch?
A. Internet browser
B. Network security tool
C. Device that connects devices within a LAN
D. Programming language
✅ Correct Answer: C
Explanation:
A switch connects multiple devices within a local area network (LAN). It forwards data only to the intended device, improving network efficiency. Switches are commonly used in offices and schools to create reliable and fast internal networks.
10. What is a modem?
A. Memory device
B. Input device
C. Device that converts digital and analog signals
D. Output device
✅ Correct Answer: C
Explanation:
A modem converts digital signals from a computer into analog signals for transmission over telephone or cable lines and converts them back at the receiving end. Modems allow computers to connect to the internet through service providers.
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