Primitive Values Mockest | JavaScript

11.

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

A). Number B). Boolean C). Object D). String

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12.

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

A). true B). false C). 1 D). 0

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13.

What does the Symbol data type represent in JavaScript?

A). A unique identifier B). A number C). A boolean value D). An object

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14.

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

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15.

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

A). undefined B). null C). 0 D). Error

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16.

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

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17.

Which primitive value represents absence of value or no value assigned?

A). undefined B). null C). 0 D). 'undefined'

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18.

What is the result of the expression true == 1 in JavaScript?

A). true B). false C). Error D). 1

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19.

Which of the following is a valid JavaScript symbol?

A). symbol B). &symbol C). #symbol D). Symbol('description')

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20.

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

A). Number B). String C). Object D). Undefined

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