1. Which of the following is a back-end technology?

❌ CSS
✅ Web API
❌ HTML
❌ Browser

Explanation:
A Web API runs on the server and handles backend logic, unlike CSS/HTML/Browser which are front-end.

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2. What quality makes it possible to run JavaScript without compiling?

❌ You can use a text editor
❌ Syntax resembles Java
✅ JavaScript is an interpreted language
❌ All modern browsers support JavaScript

Explanation:
JavaScript is executed directly by an engine (like V8) without compilation.

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3. Which application intercepts the call when JS sends a request to Node.js?

❌ JSON
❌ CSS
✅ REST Web Service
❌ Enterprise Java

Explanation:
The Node.js server exposes REST endpoints which intercept and handle client requests.

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4. Difference between ES and CommonJS modules

❌ CommonJS is a language, ES is a spec
❌ CommonJS uses .mjs, ES uses .js
✅ ES modules use import, CommonJS uses require()
❌ ES modules are not written in JS

Explanation:

• ES modules → import/export

• CommonJS → require/module.exports

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5. How to handle operation results in Node.js?

❌ Specify relative path
❌ Block asynchronous I/O
❌ Create web server instance
✅ Write callback functions to handle results when operations complete

Explanation:
Node.js is asynchronous and uses callbacks (and promises) to handle results.

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6. Purpose of http.createServer

❌ Specify main script
✅ Create a web server instance
❌ Develop anonymous function only
❌ Import a module

Explanation:
http.createServer() creates a server object that listens for HTTP requests.

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7. Which core module is used for I/O?

❌ URL
✅ fs
❌ util
❌ http

Explanation:
fs (File System) provides I/O operations for reading and writing files.

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8. Aspect of Node Package Manager (NPM)

❌ Writes metadata to package.json
❌ Creates package.json automatically
✅ Functions as a CLI for installing packages
❌ Manages versioning of source code

Explanation:
NPM’s primary role is installing, removing, and managing packages via CLI.

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9. What is the require function used for?

✅ To import a Node.js module
❌ Specify main script
❌ Handle requests/responses
❌ Create a web server

Explanation:
require() loads modules, JSON files, or built-in libraries.

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10. What happens when a module does not have package.json?

❌ Relative path becomes absolute
❌ No module manifest
✅ Node.js assumes the main script is index.js
❌ require assumes .js extension

Explanation:
Without package.json, Node defaults to index.js as the entry point.

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🧾 SUMMARY TABLE

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