Which of the following is a valid way to represent the value null in JavaScript?

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

A). Number

B). String

C). Object

D). Undefined

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 result of the expression true == 1 in JavaScript?

A). true

B). false

C). Error

D). 1

What is the result of the expression 5 + '5' in JavaScript?

A). 10

B). '55'

C). '10'

D). Error

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

A). #

B). $

C). !

D). true/false

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

A). true

B). false

C). 1

D). 0

Which of the following is a valid JavaScript symbol?

A). symbol

B). &symbol

C). #symbol

D). Symbol('description')

What does the Symbol data type represent in JavaScript?

A). A unique identifier

B). A number

C). A boolean value

D). An object

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