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.
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Practice Test
1. What is Node.js primarily used for?
A. Front-end development
B. Back-end development
C. Mobile app development
D. Game development
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Answer: Back-end development
2. Who is the original author of Node.js?
A. Tim Berners-Lee
B. Mark Zuckerberg
C. Ryan Dahl
D. Larry Page
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Answer: Ryan Dahl
3. Which programming language is commonly used for server-side scripting in Node.js?
A. Java
B. Python
C. JavaScript
D. Ruby
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Answer: JavaScript
4. What is the key advantage of Node.js for building scalable applications?
A. Built-in database management
B. Single-threaded, non-blocking I/O model
C. Extensive support for multi-threading
D. Strictly typed language support
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Answer: Single-threaded, non-blocking I/O model
5. Which core feature of Node.js allows developers to execute functions asynchronously?
A. Callbacks
B. Promises
C. Synchronous execution
D. Threads
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Answer: Callbacks
6. What package manager is commonly used in the Node.js ecosystem to manage dependencies?
A. NPM (Node Package Manager)
B. Composer
C. PyPI
D. RubyGems
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Answer: NPM (Node Package Manager)
7. What is the primary purpose of the Node.js event loop?
A. To create HTML templates
B. To manage database migrations
C. To handle asynchronous operations efficiently
D. To define API routes
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Answer: To handle asynchronous operations efficiently
8. Which platform is Node.js built on top of?
A. .NET
B. Java
C. V8 JavaScript engine
D. Ruby on Rails
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Answer: V8 JavaScript engine
9. What type of applications are well-suited for Node.js development?
A. Scientific simulations
B. Real-time applications, such as chat applications and online gaming
C. 3D modeling and animation
D. Batch processing applications
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Answer: Real-time applications, such as chat applications and online gaming
10. What does "npm" stand for in the context of Node.js development?
A. Node Package Management
B. Notable Programming Module
C. New Project Maker
D. Node Process Manager
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Answer: Node Package Management
