Given let a = "10"; let b = 20;, what is the result of a + b?

What will typeof NaN return in JavaScript?

A). number

B). NaN

C). undefined

D). object

What happens when you add a number and a string in JavaScript?

A). An error is thrown

B). The number is converted to a string

C). The string is converted to a number

D). Both are converted to boolean

What is the type of the value returned by parseFloat('3.14abc')?

A). number

B). string

C). NaN

D). undefined

Which operator is used to determine the type of a variable in JavaScript?

A). typeof

B). instanceof

C). type

D). isType

What does it mean that JavaScript is dynamically typed?

A). Variables do not have types

B). Variables can change type

C). Variables must be declared with a type

D). Variables cannot change type

Which of the following values is considered falsy in JavaScript?

A). 1

B). 0

C). 0

D). {}

Given the code: let y = 10; y = true;, what is the type of y after execution?

A). number

B). boolean

C). string

D). object

What is the initial type of a variable declared with let a;?

A). null

B). number

C). undefined

D). object

What is the type of the value returned by JSON.parse('null')?

A). null

B). string

C). object

D). undefined

In JavaScript, what will be the type of a variable x after x = 5 + true;?

A). number

B). string

C). boolean

D). undefined