MCQs on Introduction to JavaScript | JavaScript

300+ Free MCQs Quiz on JavaScript Basics | JavaScript MCQs on Introduction to JavaScript | JavaScript

JavaScript is a versatile, powerful scripting language used widely in web development. This chapter introduces JavaScript’s origins, setup steps, and foundational code practices to get you started coding directly in HTML.

Chapter 1: Introduction to JavaScript

Topic 1: History and Evolution of JavaScript

Which company developed JavaScript in 1995?
- a) Microsoft
- b) Netscape
- c) Apple
- d) Google
JavaScript was initially known as:
- a) Mocha
- b) Java
- c) TypeScript
- d) ECMAScript
What was the main purpose of creating JavaScript initially?
- a) Building server applications
- b) Adding interactivity to web pages
- c) Managing databases
- d) Machine learning
Who is considered the creator of JavaScript?
- a) Tim Berners-Lee
- b) Brendan Eich
- c) Dennis Ritchie
- d) Larry Page
In which year was ECMAScript 6, a major JavaScript update, released?
- a) 2009
- b) 2011
- c) 2015
- d) 2018
Which organization is responsible for the standardization of JavaScript?
- a) ISO
- b) ECMA
- c) IEEE
- d) W3C

Topic 2: Setting Up the Environment (Editors, Browsers)

Which of the following is NOT a commonly used code editor for JavaScript?
- a) Visual Studio Code
- b) Eclipse
- c) MS Word
- d) Atom
Which browser is NOT recommended for testing JavaScript?
- a) Chrome
- b) Firefox
- c) Safari
- d) Internet Explorer 6
To run JavaScript code, you need:
- a) A text editor and a web browser
- b) Only a text editor
- c) Only a compiler
- d) Special hardware
Which of the following tools is mainly used to debug JavaScript in modern browsers?
- a) Developer Console
- b) FTP
- c) Task Manager
- d) Windows PowerShell
Node.js is primarily used for:
- a) Front-end development
- b) Back-end development
- c) Design work
- d) File management
Which of these environments supports JavaScript?
- a) Web browsers
- b) Operating systems
- c) Mobile phones only
- d) Only on web servers

Topic 3: Writing and Running Your First JavaScript Code

JavaScript code can be written inside a file with which extension?
- a) .java
- b) .js
- c) .jsx
- d) .css
To display an alert box with a message, which command is used?
- a) display(“Hello World”)
- b) alert(“Hello World”)
- c) console.log(“Hello World”)
- d) popup(“Hello World”)
Which of these is correct syntax to print “Hello, World!” in the console?
- a) print(“Hello, World!”)
- b) alert(“Hello, World!”)
- c) console.log(“Hello, World!”)
- d) show(“Hello, World!”)
In which HTML tag can you write JavaScript code?
- a) <html>
- b) <body>
- c) <script>
- d) <link>
Which of the following is a valid way to add comments in JavaScript?
- a) ## This is a comment
- b) // This is a comment
- c) 
- d) * This is a comment
To create a variable in JavaScript, you can use which keyword?
- a) int
- b) let
- c) define
- d) const

Topic 4: JavaScript in HTML: `<script>` Tag and Inline Script

The <script> tag is typically placed in:
- a) <header>
- b) <footer>
- c) <head> or <body>
- d) <title>
An inline JavaScript code is written:
- a) In an external .js file
- b) Inside the HTML page directly
- c) In a CSS file
- d) In the server code
How do you link an external JavaScript file in HTML?
- a) <script src="file.js">
- b) <link src="file.js">
- c) <style src="file.js">
- d) <js src="file.js">
Which attribute must be included in the <script> tag for external files?
- a) href
- b) src
- c) style
- d) link
Inline scripts are written:
- a) In the <script> tag with no src attribute
- b) In the <script> tag with src attribute
- c) In an external JavaScript file
- d) None of the above
What attribute allows JavaScript to load asynchronously in HTML?
- a) sync
- b) async
- c) defer
- d) load
What is the purpose of the defer attribute in the <script> tag?
- a) Loads script at the beginning of the page
- b) Loads script before HTML parsing
- c) Defers script loading until HTML is parsed
- d) Prevents script from loading
Which code correctly embeds JavaScript directly into HTML?
- a) <style>JavaScript code</style>
- b) <script>JavaScript code</script>
- c) <html>JavaScript code</html>
- d) <code>JavaScript code</code>
An advantage of using external JavaScript files is:
- a) Faster execution
- b) Better security
- c) Cleaner code structure
- d) Higher browser compatibility
The <script> tag’s type attribute is often set to:
- a) “text/css”
- b) “application/xml”
- c) “text/javascript”
- d) “application/json”
What will the following code output in the browser console: console.log(5 + "5");?
- a) 10
- b) 55
- c) Error
- d) Undefined
Which of the following is NOT a correct way to include JavaScript in HTML?
- a) External script
- b) Inline script
- c) Internal CSS
- d) Internal script

Answer Key

Qno	Answer
1	b) Netscape
2	a) Mocha
3	b) Adding interactivity
4	b) Brendan Eich
5	c) 2015
6	b) ECMA
7	c) MS Word
8	d) Internet Explorer 6
9	a) A text editor and a web browser
10	a) Developer Console
11	b) Back-end development
12	a) Web browsers
13	b) .js
14	b) alert(“Hello World”)
15	c) console.log(“Hello, World!”)
16	c) `<script>`
17	b) `// This is a comment`
18	b) let
19	c) `<head>` or `<body>`
20	b) Inside the HTML page directly
21	a) `<script src="file.js">`
22	b) src
23	a) In the `<script>` tag with no `src` attribute
24	b) async
25	c) Defers script loading until HTML is parsed
26	b) `<script>JavaScript code</script>`
27	c) Cleaner code structure
28	c) “text/javascript”
29	b) 55
30	c) Internal CSS

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300+ Free MCQs Quiz on JavaScript Basics | JavaScript