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Socket.IO MCQs and Answers with Explanation: If you’re looking to learn and improve your Socket.IO skills, this article can help you with Socket.IO Multiple Choice Questions. In this article, you can find Socket.IO MCQs with answers and detailed explanations for each question to help you understand the concept easily. Additionally, this section provides a brief overview of the Socket.IO concept. Socket.IO is a popular JavaScript library that enables real-time, bidirectional communication between web clients and servers. It was developed by Guillermo Rauch in 2010 and has since become an essential tool for web developers to build real-time applications like chat applications, multiplayer games, and collaborative tools.
Socket.IO MCQ Questions and Answers
Socket.IO is built on top of the WebSockets API and provides additional features such as fallback options for older browsers and the ability to work with any backend technology. In this article, you can look at some Socket.IO Quiz Questions with answers to test your knowledge of this powerful JavaScript library.
Socket.IO Multiple Choice Questions
| Name | Socket.IO |
| Exam Type | MCQ (Multiple Choice Questions) |
| Category | Technical Quiz |
| Mode of Quiz | Online |
Top 51 Socket.IO MCQ Questions with Answers | Socket.IO Quiz
1. What is Socket.IO?
a) A Node.js library for real-time web applications
b) A PHP library for real-time web applications
c) A Python library for real-time web applications
d) A Ruby library for real-time web applications
Answer: a) A Node.js library for real-time web applications
Explanation: Socket.IO is a JavaScript library that enables real-time, bidirectional and event-based communication between the browser and the server. It is primarily used for creating real-time web applications.
2. What is the protocol used by Socket.IO?
a) HTTP
b) HTTPS
c) WebSocket
d) TCP
Answer: c) WebSocket
Explanation: Socket.IO uses the WebSocket protocol for real-time communication between the browser and the server.
3. Which method is used to emit an event from the server to the client in Socket.IO?
a) emit
b) on
c) connect
d) disconnect
Answer: a) emit
Explanation: The emit method is used to emit an event from the server to the client in Socket.IO.
4. Which method is used to listen for an event from the client in Socket.IO?
a) emit
b) on
c) connect
d) disconnect
Answer: b) on
Explanation: The on method is used to listen for an event from the client in Socket.IO.
5. Which method is used to establish a connection between the client and the server in Socket.IO?
a) emit
b) on
c) connect
d) disconnect
Answer: c) connect
Explanation: The connect method is used to establish a connection between the client and the server in Socket.IO.
6. Which method is used to disconnect a client from the server in Socket.IO?
a) emit
b) on
c) connect
d) disconnect
Answer: d) disconnect
Explanation: The disconnect method is used to disconnect a client from the server in Socket.IO.
7. Which event is emitted when a client connects to the server in Socket.IO?
a) connect
b) disconnect
c) emit
d) on
Answer: a) connect
Explanation: The connect event is emitted when a client connects to the server in Socket.IO.
8. Which event is emitted when a client disconnects from the server in Socket.IO?
a) connect
b) disconnect
c) emit
d) on
Answer: b) disconnect
Explanation: The disconnect event is emitted when a client disconnects from the server in Socket.IO.
9. Which method is used to broadcast a message to all connected clients except the sender in Socket.IO?
a) emit
b) on
c) send
d) broadcast
Answer: d) broadcast
Explanation: The broadcast method is used to broadcast a message to all connected clients except the sender in Socket.IO.
10. Which method is used to send a message to a specific client in Socket.IO?
a) emit
b) on
c) send
d) broadcast
Answer: a) emit
Explanation: The emit method is used to send a message to a specific client in Socket.IO.
11. Which method is used to join a client to a specific room in Socket.IO?
a) emit
b) on
c) join
d) leave
Answer: c) join
Explanation: The join method is used to join a client to a specific room in Socket.IO.
12. Which method is used to leave a client from a specific room in Socket.IO?
a) emit
b) on
c) join
d) leave
Answer: d) leave
Explanation: The leave method is used to leave a client from a specific room in Socket.IO.
13. Which event is emitted when a client joins a room in Socket.IO?
a) join
b) leave
c) connect
d) disconnect
Answer: a) join
Explanation: The join event is emitted when a client joins a room in Socket.IO.
14. Which event is emitted when a client leaves a room in Socket.IO?
a) join
b) leave
c) connect
d) disconnect
Answer: b) leave
Explanation: The leave event is emitted when a client leaves a room in Socket.IO.
15. What is the purpose of the Socket.IO client library?
a) To establish a connection with the server
b) To emit events from the client to the server
c) To listen for events from the server
d) All of the above
Answer: d) All of the above
Explanation: The Socket.IO client library is used to establish a connection with the server, emit events from the client to the server, and listen for events from the server.
16. Which method is used to establish a connection between the client and the server in Socket.IO client library?
a) emit
b) on
c) connect
d) disconnect
Answer: c) connect
Explanation: The connect method is used to establish a connection between the client and the server in Socket.IO client library.
17. Which method is used to emit an event from the client to the server in Socket.IO client library?
a) emit
b) on
c) connect
d) disconnect
Answer: a) emit
Explanation: The emit method is used to emit an event from the client to the server in Socket.IO client library.
18. Which method is used to listen for an event from the server in Socket.IO client library?
a) emit
b) on
c) connect
d) disconnect
Answer: b) on
Explanation: The on method is used to listen for an event from the server in Socket.IO client library.
19. Which event is emitted when the client connects to the server in Socket.IO client library?
a) connect
b) disconnect
c) emit
d) on
Answer: a) connect
Explanation: The connect event is emitted when the client connects to the server in Socket.IO client library.
20. Which event is emitted when the client disconnects from the server in Socket.IO client library?
a) connect
b) disconnect
c) emit
d) on
Answer: b) disconnect
Explanation: The disconnect event is emitted when the client disconnects from the server in Socket.IO client library.
21. What is the purpose of the Socket.IO server-side middleware?
a) To handle HTTP requests
b) To handle WebSocket requests
c) To handle Socket.IO requests
d) All of the above
Answer: d) All of the above
Explanation: The Socket.IO server-side middleware is used to handle HTTP requests, WebSocket requests, and Socket.IO requests.
22. Which method is used to use Socket.IO server-side middleware in a Node.js application?
a) use
b) connect
c) emit
d) on
Answer: a) use
Explanation: The use method is used to use Socket.IO server-side middleware in a Node.js application.
23. Which method is used to get the list of connected clients in a specific room in Socket.IO?
a) clients
b) rooms
c) join
d) leave
Answer: a) clients
Explanation: The clients method is used to get the list of connected clients in a specific room in Socket.IO.
24. Which method is used to get the list of rooms in Socket.IO?
a) clients
b) rooms
c) join
d) leave
Answer: b) rooms
Explanation: The rooms method is used to get the list of rooms in Socket.IO.
25. Which method is used to join a client to a room in Socket.IO?
a) clients
b) rooms
c) join
d) leave
Answer: c) join
Explanation: The join method is used to join a client to a room in Socket.IO.
26. Which method is used to leave a client from a room in Socket.IO?
a) clients
b) rooms
c) join
d) leave
Answer: d) leave
Explanation: The leave method is used to leave a client from a room in Socket.IO.
27. Which method is used to send a message to all clients in a specific room in Socket.IO?
a) emit
b) send
c) broadcast
d) to
Answer: d) to
Explanation: The to method is used to send a message to all clients in a specific room in Socket.IO.
28. Which method is used to send a message to all clients except the sender in a specific room in Socket.IO?
a) emit
b) send
c) broadcast
d) to
Answer: c) broadcast
Explanation: The broadcast method is used to send a message to all clients except the sender in a specific room in Socket.IO.
29. Which method is used to send a message to all connected clients in Socket.IO?
a) emit
b) send
c) broadcast
d) all
Answer: d) all
Explanation: All method is used to send a message to all connected clients in Socket.IO.
30. Which method is used to check if a client is connected to the server in Socket.IO?
a) connected
b) disconnected
c) emit
d) on
Answer: a) connected
Explanation: The connected method is used to check if a client is connected to the server in Socket.IO.
31. Which method is used to check if a client is disconnected from the server in Socket.IO?
a) connected
b) disconnected
c) emit
d) on
Answer: b) disconnected
Explanation: The disconnected method is used to check if a client is disconnected from the server in Socket.IO.
32. Which method is used to set a limit on the maximum number of clients that can connect to the server in Socket.IO?
a) setMaxListeners
b) setMaxConnections
c) setMaxClients
d) setMaxSockets
Answer: c) setMaxClients
Explanation: The setMaxClients method is used to set a limit on the maximum number of clients that can connect to the server in Socket.IO.
33. Which method is used to handle errors in Socket.IO?
a) onError
b) handleError
c) error
d) catch
Answer: c) error
Explanation: The error method is used to handle errors in Socket.IO.
34. Which method is used to set the log level in Socket.IO?
a) setLogLevel
b) setLog
c) logLevel
d) log
Answer: a) setLogLevel
Explanation: The setLogLevel method is used to set the log level in Socket.IO.
35. Which method is used to set the transports that Socket.IO can use?
a) setTransports
b) setTransport
c) transports
d) transport
Answer: a) setTransports
Explanation: The setTransports method is used to set the transports that Socket.IO can use.
36. Which method is used to set the origins that Socket.IO can use?
a) setOrigins
b) setOrigin
c) origins
d) origin
Answer: a) setOrigins
Explanation: The setOrigins method is used to set the origins that Socket.IO can use.
37. Which method is used to get the list of connected clients in Socket.IO?
a) clients
b) connectedClients
c) listClients
d) allClients
Answer: a) clients
Explanation: The clients method is used to get the list of connected clients in Socket.IO.
38. Which event is triggered when a client connects to the server in Socket.IO?
a) connect
b) connection
c) connectClient
d) clientConnect
Answer: a) connect
Explanation: The connect event is triggered when a client connects to the server in Socket.IO.
39. Which event is triggered when a client disconnects from the server in Socket.IO?
a) disconnect
b) disconnection
c) clientDisconnect
d) disconnectClient
Answer: a) disconnect
Explanation: The disconnect event is triggered when a client disconnects from the server in Socket.IO.
40. Which event is triggered when a client joins a room in Socket.IO?
a) join
b) joined
c) roomJoin
d) clientJoin
Answer: b) joined
Explanation: The joined event is triggered when a client joins a room in Socket.IO.
41. Which event is triggered when a client leaves a room in Socket.IO?
a) leave
b) left
c) roomLeave
d) clientLeave
Answer: b) left
Explanation: The left event is triggered when a client leaves a room in Socket.IO.
42. Which event is triggered when a client sends a message to the server in Socket.IO?
a) message
b) send
c) data
d) clientMessage
Answer: b) send
Explanation: The send event is triggered when a client sends a message to the server in Socket.IO.
43. Which event is triggered when the server sends a message to a client in Socket.IO?
a) message
b) send
c) data
d) serverMessage
Answer: a) message
Explanation: The message event is triggered when the server sends a message to a client in Socket.IO.
44. Which event is triggered when an error occurs in Socket.IO?
a) error
b) onError
c) handleError
d) catch
Answer: a) error
Explanation: The error event is triggered when an error occurs in Socket.IO.
45. Which event is triggered when a client joins a namespace in Socket.IO?
a) namespaceJoin
b) joinedNamespace
c) joinNamespace
d) connectNamespace
Answer: b) joinedNamespace
Explanation: The joinedNamespace event is triggered when a client joins a namespace in Socket.IO.
46. Which event is triggered when a client leaves a namespace in Socket.IO?
a) namespaceLeave
b) leftNamespace
c) leaveNamespace
d) disconnectNamespace
Answer: b) leftNamespace
Explanation: The leftNamespace event is triggered when a client leaves a namespace in Socket.IO.
47. What is the name of the method used to send a message to all clients in a room except the sender in Socket.IO?
a) broadcast
b) sendAll
c) emit
d) sendToRoom
Answer: a) broadcast
Explanation: The broadcast method is used to send a message to all clients in a room except the sender in Socket.IO.
48. Which method is used to remove a client from a room in Socket.IO?
a) removeClient
b) deleteClient
c) leaveRoom
d) removeRoom
Answer: c) leaveRoom
Explanation: The leaveRoom method is used to remove a client from a room in Socket.IO.
49. Which method is used to send a message to all clients in a namespace in Socket.IO?
a) emit
b) broadcast
c) sendToNamespace
d) sendToAll
Answer: a) emit
Explanation: The emit method is used to send a message to all clients in a namespace in Socket.IO.
50. Which method is used to get the list of namespaces in Socket.IO?
a) namespaces
b) getNamespaces
c) listNamespaces
d) allNamespaces
Answer: a) namespaces
Explanation: The namespaces method is used to get the list of namespaces in Socket.IO.
51. Which method is used to get the ID of a socket in Socket.IO?
a) socketID
b) id
c) getID
d) socketId
Answer: b) id
Explanation: The id method is used to get the ID of a socket in Socket.IO.
Socket.IO is a JavaScript library that has transformed the development of real-time applications. These Socket.IO Multiple Choice Questions will help you test your knowledge and enhance your understanding of this powerful library, making you a more proficient web developer in real-time communication. Don’t forget to bookmark our Freshersnow website to receive notifications for various technical quizzes.