Which symbol is used to represent a boolean value in JavaScript?
A). #
B). $
C). !
D). true/false
What is the data type of the value NaN in JavaScript?
A). Number
B). String
C). Object
D). Undefined
Which primitive value represents absence of value or no value assigned?
A). undefined
B). null
C). 0
D). 'undefined'
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 happens when you try to access a variable that has not been declared in JavaScript?
A). SyntaxError is thrown
B). ReferenceError is thrown
C). TypeError is thrown
D). Undefined
Which of the following statements is true about JavaScript's null value?
A). It represents an empty string
B). It represents a non-existent value
C). It represents a boolean value
D). It represents a number
What is the data type of the value undefined in JavaScript?
A). String
B). Object
C). Undefined
D). Number
What is the result of the expression true == 1 in JavaScript?
A). true
B). false
C). Error
D). 1
Which of the following is not a primitive value in JavaScript?
A). Number
B). Boolean
C). Object
D). String
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