What will be the output of typeof undefined in JavaScript?
A). String
B). Undefined
C). Null
D). Object
Which symbol is used to denote a comment in JavaScript?
A). //
B). --
C). #
D). /* ... */
What will be the output of typeof {} in JavaScript?
A). Object
B). Null
C). Undefined
D). Boolean
What is the data type of the value Infinity in JavaScript?
A). Number
B). String
C). Boolean
D). Null
What is the data type of the value NaN in JavaScript?
A). Null
B). String
C). Number
D). Boolean
What will be the data type of the result when dividing a number by zero in JavaScript?
A). Infinity
B). NaN
C). Undefined
D). Null
Which of the following is not a valid JavaScript data type?
A). Integer
B). Object
C). Symbol
D). NaN
Which data type is used to represent a unique identifier in JavaScript?
A). Identifier
B). Key
C). Object
D). Symbol
What data type is used to represent a collection of key-value pairs in JavaScript?
A). Object
B). Array
C). Map
D). Set
What will be the output of typeof NaN in JavaScript?
A). String
B). Number
C). NaN
D). Undefined