What is the data type of the value NaN in JavaScript?

What is the result of the expression undefined + null in JavaScript?

A). undefined

B). null

C). 0

D). Error

What is the result of the expression true + false in JavaScript?

A). true

B). false

C). 1

D). 0

Which of the following is not a primitive value in JavaScript?

A). Number

B). Boolean

C). Object

D). String

What happens when you add two numbers using the + operator in JavaScript?

A). The numbers are concatenated

B). The numbers are multiplied

C). The numbers are added

D). An error occurs

What is the data type of the value undefined in JavaScript?

A). String

B). Object

C). Undefined

D). Number

Which symbol is used to represent a boolean value in JavaScript?

A). #

B). $

C). !

D). true/false

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

Which of the following is a valid JavaScript symbol?

A). symbol

B). &symbol

C). #symbol

D). Symbol('description')

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 statements about primitive values in JavaScript is true?

A). They are mutable

B). They are passed by reference

C). They are stored on the heap

D). They are immutable