JavaScript Quiz

by Barry Allen | Nov 19, 2022 | Assessment, Interview

Welcome to our JavaScript Quiz! JavaScript is a popular programming language that is widely used for both front-end and back-end web development. Whether you’re a seasoned JavaScript developer or just starting out, this quiz will challenge your knowledge of JavaScript concepts, features, and best practices. With a mix of multiple choice and scenario-based questions, you’ll be tested on topics like variables, functions, objects, arrays, and more. So, let’s get started and see how well you know JavaScript!

JavaScript Quiz

Test your knowledge of JavaScript concepts, features, and best practices with our interactive quiz!

1 / 30

Which method converts the array to string?

toString()

ToString()

tostrings()

none

2 / 30

__________ is an event in which the user pushes a keyword key.

onClick()

onKeyDown()

onLoad()

onChanges()

3 / 30

What will be the output of the code below?

8 , 9

9 , 9

9 9

8 9

4 / 30

Js objects are written on

Value:Key pair

Key:value pair

Statement : Value

ALL

5 / 30

What is the syntax of function in JS?

Function functionID (Parameter1, Parameter2, ..) { //Function body }

Function functionName (Parameter1, Parameter2, ..) { //Function body }

Function function(Parameter1, Parameter2, ..) { //Function body }

Function (Parameter1, Parameter2, ..) { //Function body }

6 / 30

Javascript typed array can be used to access ______.

Raw Binary data

Array items

String

Data

7 / 30

Which generation introduced the const keyword?

ES5

ES2

ES6

ES7

8 / 30

For deleting array elements, we should use

delete

pop()

shift()

Both b & c

9 / 30

Which of the following is the syntax of the let keyword?

let variable_name = "value";

$let variable_name = value;

let variable_name = value;

let variable name = value;

10 / 30

The ________ method adds new items to an array.

slice()

add()

splice()

Newarr()

11 / 30

Javascript is also known as

Untyped language

lossely typed language

Dynamic typed language

ALL

12 / 30

What will be the output of the code below?

13 / 30

Which is used for debugging

windows.alert()

inner.HTML()

document.write()

console.log()

14 / 30

What will be the output of the code below?

567

none

15 / 30

In how many ways can we print output in JS?

16 / 30

Which of the following will print output of 7?

<!DOCTYPE html> <html> <body> <p id="demo"></p> <script> const term1 = 5; const term2 = 2; let total = term1 + term2; document.getElementById("demo").innerHTML = "The total is: " + total; </script> </body> </html>

17 / 30

_________ is used to declare variable with block scope & ______ used for global scope.

int , var

let,var

var, let

char , var

18 / 30

Which of the following code will provide output 12?

<!DOCTYPE html> <html> <body> <p id="demo1"></p> <script> let a, b, c; a = 5; b = 5; c = a + b; document.getElementById("demo1").innerHTML = c; </script> </body> </html>

<!DOCTYPE html> <html> <body> <p id="demo1"></p> <script> let a, b, c; a = 5; b = 7; c = a + b; document.getElementById("demo1").innerHTML = b; </script> </body> </html>

<!DOCTYPE html> <html> <body> <p id="demo1"></p> <script> let a, b, c; a = 5; b = 7; c = a + b; document.getElementById("demo1").innerHTML = c; </script> </body> </html>

<!DOCTYPE html> <html> <body> <p id="demo1"></p> <script> let a, b, c; a = 5; b = 12; c = a + b; document.getElementById("demo1").innerHTML = c; </script> </body> </html>

19 / 30

Which of these is not a JS keyword?

return

for

function

int

20 / 30

What will be the output of the code below?

Peter Mary

Mary

Peter

none

21 / 30

The programming instruction in JS is called _________.

statement

condition

step

process

22 / 30

Which of the following code will provide output 110?

<!DOCTYPE html> <html> <body> <p id="demo"></p> <script> int x, y; x = 5 + 6; y = x * 10; document.getElementById("demo").innerHTML = y; </script> </body> </html>

<!DOCTYPE html> <html> <body> <p id="demo"></p> <script> var x, y; x = 5 + 6; y = x * 10; document.getElementById("demo").innerHTML = y; </script> </body> </html>

<!DOCTYPE html> <html> <body> <p id="demo"></p> <script> const x, y; x = 5 + 6; y = x * 10; document.getElementById("demo").innerHTML = y; </script> </body> </html>

<!DOCTYPE html> <html> <body> <p id="demo"></p> <script> char x, y; x = 5 + 6; y = x * 10; document.getElementById("demo").innerHTML = y; </script> </body> </html>

23 / 30

Can a single error in code stop the whole website rendering?

yes

24 / 30

What will be the output of the code below?

Blank

Peter

Error

None

25 / 30

What is the main feature of JS?

Array

light weight

platform independent

Handling events

26 / 30

What will be the output of the code below?

The value of z is z

The value of z is 7

The value of z is 7.

27 / 30

JS is case sensitive

True

False

28 / 30

Internal Js means

JS in HTML

JS outside HTML

JS in div tag

ALL

29 / 30

What will be the output of the code below?

JS example

Js example

JS example 10

30 / 30

Javascript can be used for

Client-side

server-side

Both a & b

none

Your score is

Author

Barry Allen

A Full Stack Developer with 10+ years of experience in technical content creation.

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Author

Barry Allen

A Full Stack Developer with 10+ years of experience in technical content creation.

View all posts

JavaScript Quiz

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