Question 1

Which keyword in JavaScript allows variables to be block scoped?

Accepted Answer

let

Answer

block

Answer

const

Answer

dynamic

Answer

var

Question 2

What does the term 'hoisting' refer to in JavaScript?

Accepted Answer

Variable and function declarations are moved to the top of their containing scope during the compile phase

Answer

Resizing images dynamically

Answer

Animating elements on a webpage

Answer

Handling user input in real-time

Question 3

What is a closure in JavaScript?

Accepted Answer

A closure is the combination of a function and the lexical environment within which that function was declared

Answer

A type of loop structure

Answer

A way to lock data in a JavaScript application

Answer

An error handling mechanism

Question 4

Which keyword in JavaScript is used to declare constants?

Accepted Answer

const

Answer

final

Answer

let

Answer

var

Answer

static

Question 5

How does the 'let' keyword differ from the 'var' keyword in JavaScript?

Accepted Answer

'let' is block-scoped while 'var' is function-scoped

Answer

'let' is declared globally by default

Answer

'var' allows block-scoping in ES6

Answer

'let' allows variable re-declaration within the same block

Answer

'var' can be used inside for loops only

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