JavaScript Quiz

In this JavaScript Quiz section – every Question Carries 2 Marks. If any question is wrong then two marks will be deducted.

Note: – Fill the information Correctly to get Certified.

JavaScript

1 / 50

What does JavaScript primarily allow you to do?

Style web pages

Create interactive web pages

Define web page structure

Store data on the server

2 / 50

Which keyword is used to declare a variable in JavaScript?

var

int

string

let

3 / 50

Which data type represents true or false values in JavaScript?

string

boolean

number

object

4 / 50

What is the correct syntax for an if statement in JavaScript?

if (condition) { // code }

if { (condition) // code }

{ if condition // code }

(condition) { // code }

5 / 50

Which operator is used for concatenating strings in JavaScript?

6 / 50

What will the following code output? console.log(2 + "2");

222

Error

7 / 50

Which function is used to output data to the console in JavaScript?

console.print()

print()

console.log()

log()

8 / 50

What does the typeof operator return for a function?

"function"

"object"

"undefined"

"number"

9 / 50

Which statement is used to exit from a loop in JavaScript?

break

exit

return

continue

10 / 50

What is the correct way to comment in JavaScript?

// comment

/* comment */

## comment ##

11 / 50

Which method is used to add an element to the end of an array in JavaScript?

append()

push()

addToEnd()

insert()

12 / 50

What will the following code output? console.log("5" + 3 + 2);

"532"

"57"

Error

13 / 50

Which operator is used for strict equality comparison in JavaScript?

===

!==

14 / 50

How do you declare a constant variable in JavaScript?

var

let

const

constant

15 / 50

What will the following code output? console.log("Hello".length);

"Hello"

Error

16 / 50

Which keyword is used to define a function in JavaScript?

function

define

func

17 / 50

What is the correct way to include an external JavaScript file in an HTML document?

18 / 50

Which method is used to remove the last element from an array in JavaScript?

pop()

removeLast()

deleteLast()

splice()

19 / 50

What is the purpose of the setTimeout() function in JavaScript?

Calls a function after a specified delay

Sets a timer for recurring intervals

Pauses the execution of code

Resets the browser

20 / 50

What will the following code output? console.log(typeof null);

"null"

"undefined"

"object"

"string"

21 / 50

Which operator is used to access properties of an object in JavaScript?

22 / 50

What is the correct way to declare a single-line comment in JavaScript?

# comment

// comment

/* comment */

23 / 50

Which method is used to convert a string to uppercase in JavaScript?

toUpperCase()

upperCase()

toUpper()

convertUpperCase()

24 / 50

What is the output of the following code?

Hello

World

Error

25 / 50

Which method is used to concatenate two or more arrays in JavaScript?

join()

merge()

concat()

combine()

26 / 50

What will the following code output? console.log(5 == "5");

true

false

Error

27 / 50

Which function is used to parse a string and return an integer in JavaScript?

parseInt()

toInt()

parseInteger()

stringToInt()

28 / 50

What is the correct way to loop through elements of an array in JavaScript?

for (let i = 0; i < array.length; i++)

foreach (element in array)

while (array)

loop (array)

29 / 50

Which operator is used for logical AND in JavaScript?

| |

30 / 50

What will the following code output?

Error

31 / 50

Which method is used to find the index of a specified value in an array in JavaScript?

index()

findIndex()

search()

indexOf()

32 / 50

What is the correct way to write an anonymous function in JavaScript?

function myFunction( ) { }

myFunction: function( ) { }

( ) => { }

function( ) { }

33 / 50

What is the purpose of the this keyword in JavaScript?

Refers to the current object

Refers to the previous object

Refers to the next object

Refers to a global object

34 / 50

Which method is used to convert an object to a JSON string in JavaScript?

toJSON()

stringify()

stringifyJSON()

objectToString()

35 / 50

What will the following code output? console.log(10 % 3);

0.1

36 / 50

Which method is used to remove the first element from an array in JavaScript?

shift( )

removeFirst( )

deleteFirst( )

splice( )

37 / 50

What is the correct way to write an else if statement in JavaScript?

elseif (condition) { // code }

else { if (condition) { // code } }

else if (condition) { // code }

else: if (condition) { // code }

38 / 50

Which function is used to round a number down to the nearest integer in JavaScript?

ceil( )

round( )

floor( )

trunc( )

39 / 50

What is the output of the following code?

Error

40 / 50

Which function is used to execute a piece of code repeatedly at fixed intervals in JavaScript?

repeat()

setInterval()

loop()

executeAtInterval()

41 / 50

What will the following code output? console.log(Boolean(0));

true

false

42 / 50

Which method is used to sort elements of an array in JavaScript?

sort( )

order( )

arrange( )

sortBy( )

43 / 50

What is the purpose of the new keyword in JavaScript?

Creates a new object

Deletes an object

Updates an object

Modifies an object

44 / 50

Which method is used to convert a string to lowercase in JavaScript?

toLowerCase()

lowerCase()

convertToLower()

stringToLower()

45 / 50

What will the following code output?

105

510

Error

46 / 50

What does the Array.isArray() method check for in JavaScript?

Checks if a variable is a string

Checks if a variable is an object

Checks if a variable is an array

Checks if a variable is undefined

47 / 50

Which method is used to convert a number to a string in JavaScript?

convertToString()

string()

toString()

toStr()

48 / 50

What is the correct way to write a for loop in JavaScript?

for (let i = 0; i <= 10; i++) { }

for (i = 0; i <= 10; i++) { }

for (i <= 10; i++) { }

for (let i = 0; i++) { }

49 / 50

What will the following code output? console.log("Hello" + " " + "World");

HelloWorld

Hello World

"Hello World"

Error

50 / 50

Which method is used to remove elements from an array with specified positions in JavaScript?

delete()

splice()

remove()

removeFrom()

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