What is the output of '5' + 3?
A). 8
B). 53
C). 8
D). Error
What will typeof NaN return?
A). number
B). NaN
C). undefined
D). object
What will typeof [1, 2, 3] return?
A). array
B). object
C). number
D). list
What is the result of typeof Symbol('id')?
A). symbol
B). object
C). string
D). undefined
What is the data type of 42 in JavaScript?
A). String
B). Boolean
C). Number
D). Object
What is the output of typeof null?
A). null
B). undefined
C). object
D). number
How do you declare a variable with an undefined value?
A). let x;
B). let x = '';
C). let x = 0;
D). let x = null;
Which of the following is not a primitive data type in JavaScript?
A). String
B). Number
C). Object
D). Boolean
What is the result of null === undefined?
A). 1
B). 0
C). Error
D). NaN
Which function can convert a number to a string in JavaScript?
A). toString()
B). parseInt()
C). String()
D). Number()