What is the output of the following code: let z = 3; z = 5; console.log(z);?

What error will the following code produce: const PI; PI = 3.14;?

A). SyntaxError

B). TypeError

C). ReferenceError

D). No error

What is the primary difference between var and let?

A). Scope

B). Initialization

C). Data type

D). Assignment

Which keyword should be used for a variable that might be reassigned?

A). const

B). let

C). var

D). function

Which keyword allows block-level scope in ES6?

A). var

B). let

C). function

D). var and function

What is the temporal dead zone in ES6?

A). Time between function calls

B). Period between variable declaration and initialization

C). Time between two loops

D). Interval between event listeners

What will the following code output: { const a = 10; a = 20; }?

A). 10

B). 20

C). undefined

D). TypeError

Are variables declared with let and const accessible before they are declared?

A). Yes

B). No

C). Only in strict mode

D). Only if they are numbers

What is the value of a const variable once it is assigned?

A). Can be changed later

B). Cannot be changed later

C). Depends on the data type

D). Undefined initially

What is the scope of a variable declared with let?

A). Global

B). Function

C). Block

D). Object

Which keyword is used to declare a read-only named constant?

A). let

B). var

C). const

D). static