Multiple Choice Questions on JavaScript for Interactive Websites

📚 Quick Study Guide

• 🔑 JavaScript is a scripting language that enables you to create dynamically updating content, control multimedia, animate images, and pretty much everything else.
• ✏️ Variables are containers for storing data values. You can declare them using `var`, `let`, or `const`. `let` and `const` are block-scoped.
• 🧮 Data types include: String, Number, Boolean, Null, Undefined, Symbol, and Object.
• 🚦 Control flow statements (`if`, `else if`, `else`, `switch`) allow you to execute different blocks of code based on conditions.
• ♻️ Loops (`for`, `while`, `do...while`) are used to execute a block of code repeatedly.
• 🧩 Functions are reusable blocks of code that perform a specific task. They are defined using the `function` keyword.
• 🖱️ The Document Object Model (DOM) represents the structure of an HTML document as a tree. JavaScript can manipulate the DOM to change the content and appearance of a webpage.
• 👂 Event listeners allow you to respond to user actions, such as clicks, mouseovers, and form submissions.

Practice Quiz

1. Which keyword is used to declare a variable in JavaScript?
   1. var
   2. let
   3. const
   4. All of the above
2. Which of the following is NOT a JavaScript data type?
   1. String
   2. Number
   3. Boolean
   4. Character
3. What is the purpose of the DOM?
   1. To style HTML elements
   2. To define HTML structure
   3. To represent the HTML document as a tree
   4. To execute server-side code
4. How do you write an IF statement in JavaScript?
   1. if i == 5 then
   2. if (i == 5)
   3. if i = 5 then
   4. if i = 5
5. What is the correct way to write a JavaScript array?
   1. var colors = "red", "green", "blue"
   2. var colors = (red, green, blue)
   3. var colors = ["red", "green", "blue"]
   4. var colors = 1 = ("red"), 2 = ("green"), 3 = ("blue")
6. How do you call a function named "myFunction"?
   1. call myFunction()
   2. myFunction()
   3. call function myFunction
   4. function myFunction()
7. Which event occurs when the user clicks on an HTML element?
   1. onmouseover
   2. onchange
   3. onclick
   4. onkeydown