Which of the following is a primitive data type in JavaScript?
A). Object
B). Array
C). Function
D). Boolean
What is the outcome of typeof undefined in JavaScript?
A). String
B). Undefined
C). Null
D). Number
What will the following code snippet output: let a = 10; a += '5'; console.log(a); in JavaScript?
A). '105'
B). 105
C). 15
D). '15'
What is the data type of the value 'null' (with quotes) in JavaScript?
A). String
B). Number
C). Null
D). Undefined
What will let x = '10'; let y = x - 5; console.log(y); output in JavaScript?
A). '5'
B). 5
C). '10'
D). 10
What does NaN represent in JavaScript?
A). Not a Number
B). Infinity
C). Positive Infinity
D). Negative Infinity
What is the data type of the value undefined in JavaScript?
A). Number
B). Boolean
C). String
D). Undefined
What is the data type of the value true in JavaScript?
A). Number
B). String
C). Boolean
D). Undefined
Which data type represents positive infinity in JavaScript?
A). Infinity
B). Number
C). NaN
D). Null
Which of these is a complex or reference data type in JavaScript?
A). Number
B). Boolean
C). Object
D). String