Fundamental Concepts in Node.js Backend Development Quiz

Explore essential Node.js topics including server-side JavaScript execution, core modules, package management, runtime architecture, and event handling to solidify your backend development knowledge.

1. 1️⃣ Main Purpose of Node.js

   What is Node.js mainly used for?

   1. Running JavaScript on the server side
   2. Editing images and videos
   3. Programming mobile applications
   4. Designing user interface elements

   Explanation: Node.js is primarily used for executing JavaScript on the server, enabling backend development with JavaScript. Designing UI elements and editing media files are tasks for frontend or specialized software. While it can assist in mobile backend services, it is not mainly used for building mobile apps directly.

2. 2️⃣ Node.js Engine

   Node.js runs on which JavaScript engine?

   1. SpiderMonkey
   2. JavaScriptCore
   3. Google V8 JavaScript engine
   4. Chakra

   Explanation: The Google V8 JavaScript engine powers Node.js, providing its efficient execution of JavaScript code. SpiderMonkey is associated with Firefox, JavaScriptCore with Safari, and Chakra with earlier versions of Microsoft Edge.

3. 3️⃣ npm in Node.js

   What is npm primarily used for in Node.js development?

   1. Compiling source code
   2. Designing databases
   3. Debugging applications
   4. Installing libraries and managing packages

   Explanation: npm, short for Node Package Manager, is mainly used for installing and managing JavaScript libraries. It does not compile source code, design databases, or directly debug applications, although packages for those tasks can be installed with it.

4. 4️⃣ Node.js Architecture

   What type of architecture does Node.js use to handle multiple requests?

   1. Batch-processing oriented
   2. Single-threaded, event-driven
   3. Multi-threaded, blocking
   4. Process-based, synchronous

   Explanation: Node.js uses a single-threaded, event-driven architecture to manage concurrent requests efficiently. Unlike multi-threaded or process-based approaches, it relies on non-blocking operations. Batch-processing and synchronous models do not describe its core behavior.

5. 5️⃣ Callback Functions in Node.js

   What is a callback function in Node.js?

   1. A function that never returns a value
   2. A function used only in the frontend
   3. A function executed after another function completes
   4. A function defined outside any module

   Explanation: A callback is executed once another function finishes, often used to handle asynchronous events. Callbacks return values if needed, can be defined anywhere, and are not restricted to frontend code.

6. 6️⃣ Server Creation Module

   Which built-in module is used to create a server in Node.js?

   1. http
   2. path
   3. url
   4. fs

   Explanation: The http module is used to create basic servers in Node.js. The fs module handles file systems, path handles file paths, and url parses URLs, none of which directly create servers.

7. 7️⃣ Express.js Definition

   What is Express.js in the context of Node.js?

   1. A minimal and fast web framework for Node.js
   2. A front-end styling toolkit
   3. A built-in database system
   4. An operating system for web servers

   Explanation: Express.js is a lightweight and flexible framework for building web applications in Node.js. It is not a database, styling toolkit, or operating system.

8. 8️⃣ Function of require()

   What does the require() function do in Node.js?

   1. Starts the Node.js runtime
   2. Compiles JavaScript to machine code
   3. Exports variables from a file
   4. Imports modules into a file

   Explanation: require() allows you to import modules or packages into your Node.js files, enabling modular design. It does not export variables, start runtimes, or perform compilation.

9. 9️⃣ Middleware in Express.js

   In Express.js, what is middleware?

   1. Application configuration files
   2. Database connection scripts
   3. Client-side utility libraries
   4. Functions that run before the final request handler

   Explanation: Middleware are functions in Express.js that execute during the request-response cycle, typically before the final handler. They are not configs, database scripts, or client-side tools.

10. 🔟 Event Handling in Node.js

    Which object is used to handle events in Node.js?

    1. RequestHandler
    2. StreamWriter
    3. Console
    4. EventEmitter

    Explanation: EventEmitter is the core object in Node.js for handling events through its on and emit methods. StreamWriter, RequestHandler, and Console do not serve this purpose.