reactJS mcq(multiple choice) question with answers

1. What describes the ReactJS?

Server Side Framework

Client Side Framework

Both A & B

None of these

2. ReactJS written in which language?

Java

PHP

Javascript

None of these

3. Which command is used to create the new react app?

npx create-react-app my-app

npx create-react-app -g my-app

npx create-new-react-app my-app

None of these

4. What is Babel?

Compiler

Interpreter

Both A & B

None of these

5. Why react is mainly used for?

Database

User Interface

MVC

None of the above

6. JSX stands for?

Javscript Extension

Javascript

Javascript XML

None of these

7. What will be the output of the following code?

import React, { Component } from 'react';  
const App = () => {  
    
      return(  
         <div>  
            <h1 className = "hello" >{25+20}</h1>  
         </div>  
      );   
}  
export default App;

25

45

35

None of these

8. Why JSX used for?

To write HTML in React

To write jquery in React

To write SQL in React

None of these

9. What do you mean by ES6?

Javascript 6

Extended Javascript 6

ECMAScript 6

None of these

10. What is the virtual DOM in React?

A JavaScript library for building user interfaces

A lightweight JavaScript object that represents the actual DOM

A method for updating the view in MVC architecture

A tool for handling events and state in web applications

11. What is the purpose of JSX in React?

To improve the performance of the virtual DOM

To handle browser events in a more efficient way

To make it easier to work with state and props

To provide a way to write HTML elements in JavaScript

12. What is React?

A JavaScript library

A CSS framework

A Python library

A PHP library

13. What is the purpose of React state?

To store static data

To store styles

To store dynamic data

To store function

14. What is the use of React hooks?

To manage state and side effects in functional components

To manage styles in functional components

To manage state and side effects in class components

To manage styles in class components

15. What is the purpose of useEffect hook in React?

To add event listeners

To perform side effects

To render components

To manage state

16. What is the purpose of useState hook in React?

To manage state in functional components

To manage side effects in functional components

To manage state in class components

To manage side effects in class components

17. What is React component?

HTML document

A HTML element

A CSS stylesheet

A JavaScript function

18. How does React handle updates to the component state?

By updating the whole component

By updating specific parts of the component

By adding a new component

By removing the component

19. What is the purpose of setState in React?

To set the component event listeners

To set the component props

To set the component state

To set the component styles

20. What is the purpose of props in React?

To pass styles to the component

To pass data from parent to child component

To pass data from child to parent component

To pass data within the same component

reactJS mcq(multiple choice) question with answers

reactJS MCQ (Multiple Choice Question) with answers

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