What is the outcome of typeof undefined in JavaScript?
A). String
B). Undefined
C). Null
D). Number
What is the data type of the value undefined in JavaScript?
A). Number
B). Boolean
C). String
D). Undefined
What will let x = null; console.log(typeof x); output in JavaScript?
A). Object
B). Null
C). Undefined
D). Number
What does NaN represent in JavaScript?
A). Not a Number
B). Infinity
C). Positive Infinity
D). Negative Infinity
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 is the data type of the value 42 in JavaScript?
A). String
B). Boolean
C). Number
D). Null
What is the result of 0 / 0 in JavaScript?
A). Infinity
B). 0
C). NaN
D). 1
Which data type represents a block of reusable code in JavaScript?
A). String
B). Object
C). Function
D). Number
What is the outcome of typeof [1, 2, 3] in JavaScript?
A). String
B). Number
C). Array
D). Object
Which of the following is a primitive data type in JavaScript?
A). Object
B). Array
C). Function
D). Boolean