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

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

A). 3

B). 5

C). undefined

D). ReferenceError

Which keyword allows block-level scope in ES6?

A). var

B). let

C). function

D). var and function

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

A). 10

B). 20

C). undefined

D). TypeError

Can a const variable be declared without an initial value?

A). Yes

B). No

C). Only in strict mode

D). Only if it is an object

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

A). SyntaxError

B). TypeError

C). ReferenceError

D). No error

Can a variable declared with let be hoisted?

A). Yes, partially

B). No

C). Yes, fully

D). Only in strict mode

Can const be used for objects and arrays?

A). No

B). Yes

C). Only for arrays

D). Only for objects

What is the scope of a variable declared with let?

A). Global

B). Function

C). Block

D). Object

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

A). const

B). let

C). var

D). 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