What does the expression typeof '123' return in JavaScript?
A). number
B). string
C). undefined
D). boolean
Which primitive data type represents unique identifiers introduced in ECMAScript 6?
A). Number
B). Symbol
C). Boolean
D). Undefined
What does the expression typeof Symbol() return in JavaScript?
A). number
B). string
C). symbol
D). boolean
Which primitive data type represents variables that are declared but not initialized?
A). Number
B). String
C). Undefined
D). Null
What is the result of the expression typeof 'Hello' in JavaScript?
A). number
B). string
C). undefined
D). boolean
What does the expression typeof 42 return in JavaScript?
A). number
B). string
C). undefined
D). boolean
Which of the following statements accurately describes the Boolean data type in JavaScript?
A). It represents textual data
B). It represents numeric data
C). It represents logical values
D). It represents an absence of value
Which data type is represented by the value null in JavaScript?
A). Numeric data
B). Textual data
C). Absence of value
D). Logical value
Which primitive data type represents textual data?
A). Number
B). String
C). Boolean
D). Undefined
What is the result of the expression typeof undefined in JavaScript?
A). number
B). string
C). undefined
D). boolean