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

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 is the primary difference between var and let?

A). Scope

B). Initialization

C). Data type

D). Assignment

What will be the output of the following code: let x = 10; { let x = 20; } console.log(x);?

A). 10

B). 20

C). undefined

D). ReferenceError

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

A). const

B). let

C). var

D). function

Which of the following statements about const and objects is true?

A). Objects declared with const are immutable

B). Properties of objects declared with const can be changed

C). The reference of objects declared with const can be changed

D). const cannot be used with objects

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

Which keyword allows block-level scope in ES6?

A). var

B). let

C). function

D). var and function

What happens if you try to access a let variable before its declaration?

A). Returns undefined

B). Throws a ReferenceError

C). Returns null

D). Returns an empty string

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

Can const be used for objects and arrays?

A). No

B). Yes

C). Only for arrays

D). Only for objects