What is the result of the expression 5 + '5' in JavaScript?
A). 10
B). '55'
C). '10'
D). Error
Which primitive value represents absence of value or no value assigned?
A). undefined
B). null
C). 0
D). 'undefined'
Which of the following statements is true about primitive data types in JavaScript?
A). They have methods and properties
B). They can be used as keys in objects
C). They are instances of Object
D). They are passed by value
What is the result of the expression true == 1 in JavaScript?
A). true
B). false
C). Error
D). 1
What is a primitive value in JavaScript?
A). A complex data structure
B). A basic data type
C). A function
D). An array
Which of the following is a primitive data type in JavaScript?
A). Array
B). Object
C). Function
D). String
What does the Symbol data type represent in JavaScript?
A). A unique identifier
B). A number
C). A boolean value
D). An object
Which symbol is used to represent a boolean value in JavaScript?
A). #
B). $
C). !
D). true/false
What is the default value of a variable in JavaScript if it is not initialized?
A). null
B). undefined
C). 0
D). 'undefined'
What is the data type of the value undefined in JavaScript?
A). String
B). Object
C). Undefined
D). Number