Which of the following is a primitive data type in JavaScript?
A). Object
B). Array
C). Function
D). Boolean
Which data type represents positive infinity in JavaScript?
A). Infinity
B). Number
C). NaN
D). Null
What is the data type of the value undefined in JavaScript?
A). Number
B). Boolean
C). String
D). Undefined
Which operator checks if an object is an instance of a specific object type in JavaScript?
A). instanceof
B). typeof
C). isInstanceof
D). isTypeOf
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 'null' (with quotes) in JavaScript?
A). String
B). Number
C). Null
D). Undefined
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'
Which data type represents a block of reusable code in JavaScript?
A). String
B). Object
C). Function
D). Number
Which of the following is not a valid data type in JavaScript?
A). Array
B). Symbol
C). Map
D). Tuple
Which data type represents an intentional absence of any value in JavaScript?
A). Null
B). Undefined
C). String
D). Number