Question 1

In JavaScript, what keyword is used to create a new class?

Accepted Answer

class

Answer

new

Answer

function

Answer

object

Question 2

Which of the following correctly defines a constructor in a JavaScript class?

Accepted Answer

constructor() {}

Answer

setup() {}

Answer

initialize() {}

Answer

create() {}

Question 3

What is the purpose of the 'extends' keyword in a JavaScript class?

Accepted Answer

To create a subclass that inherits from a parent class

Answer

To create private properties

Answer

To define a static method

Answer

To execute a function before the class definition

Question 4

Which method is used to call a parent class's constructor in a subclass?

Accepted Answer

super()

Answer

parent()

Answer

this()

Answer

base()

Question 5

In JavaScript classes, which keyword is used to define a static method?

Accepted Answer

static

Answer

private

Answer

abstract

Answer

public

Question 6

What keyword is used to create a new instance of a class in JavaScript?

Accepted Answer

new

Answer

instance

Answer

class

Answer

create

Question 7

What does the 'this' keyword refer to in a JavaScript class method?

Accepted Answer

The current instance of the class

Answer

A static variable

Answer

The parent class

Answer

The entire class definition

Question 8

Which feature of JavaScript classes allows you to implement polymorphism?

Accepted Answer

Method overriding

Answer

Abstraction

Answer

Encapsulation

Answer

Method overloading

Question 9

What is the result of trying to access a private field outside of its containing class in JavaScript?

Accepted Answer

It will throw a SyntaxError

Answer

It will return undefined

Answer

It will display a warning

Answer

It will return null

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