JavaScript MCQ Quiz | Set - 1

JavaScript MCQ Quiz | Set – 1

Piyush Patil
April 29, 2023
Web Development, JavaScript Quiz, Quizzes
2 Comments

179

Created on April 25, 2023 By

Piyush Patil

JavaScript Quiz | Set - 1

1 / 10

Which of the following is not a primitive data type in JavaScript?

number

boolean

string

array

2 / 10

What does the 'typeof' operator return when used on a null value?

"null"

"object"

"undefined"

"NaN"

3 / 10

What is the result of the following expression?
5 + "5"

"55"

"10"

4 / 10

What is the output of the following code?

for (var i = 0; i < 5; i++) {   setTimeout(function() {      console.log(i);   }, 1000);}

0 1 2 3 4

5 5 5 5 5

undefined undefined undefined undefined undefined

The code will produce an error.

5 / 10

What does the 'this' keyword refer to in JavaScript?

The global object

The object that the function is a method of

The object currently being constructed by a constructor function

All of the above

6 / 10

Which of the following is not a looping structure in JavaScript?

for loop

while loop

do-while loop

switch statement

7 / 10

What is the output of the following code?

console.log(1 < 2 < 3);

true

false

TypeError

SyntaxError

8 / 10

What is the output of the following code?

var x = 1;var y = 2;console.log(x + y + "3");

"33"

"63"

9 / 10

Which of the following is not a valid data type in JavaScript?

object

null

undefined

decimal

10 / 10

What is the difference between '==' and '===' operators in JavaScript?

'==' compares values and '===' compares values and data types.

'==' compares data types and '===' compares values.

Both operators are identical in their functionality.

None of the above.

Your score is

The average score is 54%

2 Comments

Ramesh Gharami
May 3, 2023 / 11:04 am
Best think to do…..
Thanks for these quizzes..,
- Piyush Patil
  May 4, 2023 / 7:21 pm
  I am glad you liked it Ramesh. Thank You!

Comments are closed.