JavaScript MCQ : JS Variables (Multiple Choice Questions)

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Question 1

<!DOCTYPE html>
<html>
    <body>
        <script>
            var x = "5";
            var y = 6;
            var z = x + y;
            document.write(x + "<br>");
            document.write(y + "<br>");
            document.write(z + "<br>");
        </script>
    </body>
</html>

Guess output of the following code.

A	5 6 11
B	5 6 10
C	None of These
D	5 6 56

Question 2

<!DOCTYPE html>
<html>
    <body>
        <script>
            var num1 = 1;
            var num2 = 1;
            var num3 = "1" + num1 + num2;
            document.write(num1 + "<br>");
            document.write(num2 + "<br>");
            document.write(num3 + "<br>");
        </script>
    </body>
</html>

Guess output of the following code.

A	1 1 12
B	None of these
C	1 1 111
D	1 1 3

Question 3

<html>
    <body>
        <script>
            var x = 12.45;
            var y = 1;
            var z = '8' + x + y;
            document.write(z + "<br>");
        </script>
    </body>
</html>

Value of Z is -

A	21.451
B	813.451
C	812.451
D	21.450

Question 4

Variable declared without a value will have the value ______________.Eg.

var num;

A	undefined
B	0
C	None of these
D	null

Question 5

<html>
    
    <body>
        <script>
            var name = "John Doe";
            var name = 123;
            document.write(name + "<br>");
        </script>
    </body>

</html>

Is it possible to change the type of value after re-assignment.

A	No
B	None of these
C	Yes !! It is possible.
D	It can be possible if variable is assigned with interger value.

There are 5 questions to complete.

Pages: 1234567

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JavaScript MCQ : JS Variables (Multiple Choice Questions)

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