JavaScript MCQ Question with Answer

JavaScript MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

Question No : 15
What will be the output of the following Javascript code?

<script>
document.getElementById("demo").innerHTML = typeof "John"
</script>

integer

number

string

error

Question No : 16
JavaScript Code can be called by using ___________

RMI

Triggering Event

Preprocessor

Function/Method

Question No : 17
The type of a variable that is volatile is _______________

Volatile variable

Mutable variable

Immutable variable

Dynamic variable

Question No : 18
A hexadecimal literal begins with __________

Both 0x and 0X

Question No : 19
The generalised syntax for a real number representation is __________

[digits][.digits][(E|e)[(+|-)]digits]

[digits][+digits][(E|e)[(+|-)]digits]

[digits][(E|e)[(+|-)]digits]

[.digits][digits][(E|e)[(+|-)]digits]

Question No : 20
JavaScript _________ when there is an indefinite or an infinite value during an arithmetic computation.

Prints an exception error

Prints an overflow error

Displays Infinity

Prints the value as such

Question No : 21
Which of the following is not considered as an error in JavaScript?

Syntax error

Missing of semicolons

Division by zero

Missing of Bracket