MCQ Quiz - JavaScript

Basic Concepts

Instructions

Read each question carefully before selecting an answer
Each question has only one correct answer
You can navigate between sections using the buttons at the bottom
Click "Check Answers" to see your score for each section

30:00

Basic Concepts (Questions 1-7)

1. What is JavaScript primarily used for?

Styling web pages Adding interactivity to web pages Creating database tables

2. How do you write "Hello World" in an alert box?

alertBox("Hello World"); msg("Hello World"); alert("Hello World");

3. How do you declare a variable in JavaScript?

var myVar; variable myVar; v myVar;

4. Which operator is used for strict equality in JavaScript?

= == ===

5. What will this code output? console.log(typeof 42);

console.log(typeof 42);

"number" "integer" "float"

6. How do you create a function in JavaScript?

function myFunction() {} def myFunction() {} func myFunction() {}

7. Which method removes the last element from an array?

pop() shift() remove()

Intermediate Concepts (Questions 8-14)

8. What does the "this" keyword refer to in JavaScript?

The current function The current object The parent object

9. What is the correct way to write an IF statement in JavaScript?

if (i == 5) {} if i = 5 then {} if i == 5 then {}

10. How do you add a comment in JavaScript?

// This is a comment  * This is a comment *

11. Which event occurs when the user clicks on an HTML element?

onchange onclick onmouseover

12. How do you round the number 7.25 to the nearest integer?

// How to round 7.25 to the nearest integer?
Math.?(7.25);

Math.round(7.25) round(7.25) Math.rnd(7.25)

13. What will this code return? Boolean(10 > 9)

Boolean(10 > 9);

true false NaN

14. Which operator is used to concatenate strings in JavaScript?

+ & concat()

Advanced Concepts (Questions 15-20)

15. What is the correct way to create a JavaScript array?

var colors = ["red", "green", "blue"] var colors = "red", "green", "blue" var colors = (1:"red", 2:"green", 3:"blue")

16. How do you find the length of a string in JavaScript?

str.length str.len length(str)

17. What will this code output? console.log(2 + "2");

console.log(2 + "2");

4 "22" "4"

18. Which keyword is used to declare a constant in JavaScript?

const let constant

19. What does the Array.map() method do?

Creates a new array with results of calling a function on every element Changes the original array Filters the array based on a condition

20. What is the purpose of the "use strict" directive?

"use strict";
// JavaScript code here

To enforce stricter parsing and error handling To allow more flexible coding To enable experimental features

Quiz Completed!

0 Correct

0 Incorrect

0 Unanswered

JavaScript Programming Quiz

Instructions

Basic Concepts (Questions 1-7)

Intermediate Concepts (Questions 8-14)

Advanced Concepts (Questions 15-20)

Quiz Completed!