What is the data type of the value undefined in JavaScript?
A). String
B). Object
C). Undefined
D). Number
Which of the following is a valid JavaScript symbol?
A). symbol
B). &symbol
C). #symbol
D). Symbol('description')
What is the default value of a variable in JavaScript if it is not initialized?
A). null
B). undefined
C). 0
D). 'undefined'
Which of the following is a valid way to represent the value null in JavaScript?
A). undefined
B). NULL
C). null
D). None of the above
Which of the following is a primitive data type in JavaScript?
A). Array
B). Object
C). Function
D). String
Which symbol is used to represent a boolean value in JavaScript?
A). #
B). $
C). !
D). true/false
What does the Symbol data type represent in JavaScript?
A). A unique identifier
B). A number
C). A boolean value
D). An object
What is the result of the expression true + false in JavaScript?
A). true
B). false
C). 1
D). 0
What is the data type of the value NaN in JavaScript?
A). Number
B). String
C). Object
D). Undefined
What is the result of the expression 5 + '5' in JavaScript?
A). 10
B). '55'
C). '10'
D). Error