250+ Node Js MCQ With Online Practice Test

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Node.js, often referred to as simply "Node," is a powerful open-source runtime environment that allows developers to execute JavaScript code outside of web browsers. It is designed for building scalable and efficient network applications, particularly on the server side. Node.js leverages a non-blocking, event-driven architecture, making it ideal for handling asynchronous operations and real-time applications. With its vast ecosystem of packages and modules available through npm (Node Package Manager), Node.js has become a popular choice for web development, microservices, APIs, and more, enabling developers to create high-performance applications with ease.

11. What is the primary role of the Node.js event loop?

Answer: Executing asynchronous code and managing concurrency

12. In Node.js, what is the core concept that enables non-blocking, asynchronous operations?

Answer: Callbacks

13. What is the key benefit of non-blocking I/O in Node.js?

Answer: It enables efficient handling of multiple requests without blocking the event loop.

14. Which phase of the Node.js event loop processes I/O callbacks?

Answer: I/O Callbacks

15. In the Node.js event loop, what happens during the "Timers" phase?

Answer: Timers (e.g., setTimeout) are processed, and their associated callbacks are executed.

16. What is the primary data structure used to store pending events in the Node.js event loop?

Answer: Queues

17. Which Node.js method is commonly used to schedule a function to run after a specified number of milliseconds?

Answer: setTimeout

18. What is the purpose of the "Check" phase in the Node.js event loop?

Answer: To execute callbacks scheduled by setImmediate

19. Which Node.js function is used to add a callback to the "next tick queue" for execution in the next iteration of the event loop?

Answer: process.nextTick

20. In Node.js, what is the "Poll" phase responsible for?

Answer: Handling incoming network requests
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