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    • React tutorial Quiz 1

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    Question 1

    What is React?

    • A

      A front-end JavaScript library for building user interfaces

    • B

      A back-end framework for handling server requests

    • C

      A database for managing data storage

    • D

      A programming language for writing server-side code

    Question 2

    What is the purpose of the Virtual DOM in React?

    • A

      It improves server performance.

    • B

      It provides a faster way to update the user interface.

    • C

      It helps in routing between pages.

    • D

      It is used for managing application state.

    Question 3

    Which of the following correctly describes JSX?

    • A

      A templating engine for React

    • B

      A syntax extension for JavaScript

    • C

      A CSS preprocessor used in React

    • D

      A database query language

    Question 4

    Which of the following is a correct way to import a component in React?

    • A

      import { App } from './App.js'

    • B

      require App from './App.js'

    • C

      include App from './App.js'

    • D

      import App from './App.js'

    Question 5

    Which statement about React components is true?

    • A

      Only class components can hold state

    • B

      Components must be stored in .jsx files

    • C

      Both function and class components can be used in React

    • D

      Components can’t be reused

    Question 6

    What is a React component?

    • A

      A reusable piece of code that returns JSX

    • B

      A JavaScript variable

    • C

      A function to connect React with the backend

    • D

      A tool for compiling JSX

    Question 7

    What is the purpose of the ReactDOM.render method?

    • A

      To manage application state

    • B

      To compile JSX into JavaScript

    • C

      To render a React component into the DOM

    • D

      To define the Virtual DOM

    Question 8

    Which of the following statements about the Virtual DOM is true?

    • A

      It is the actual DOM manipulated directly by React components.

    • B

      It is a programming interface for web documents.

    • C

      It is a lightweight, in-memory representation of the actual DOM.

    • D

      It is used primarily for rendering static content in React applications.

    Question 9

    How can you conditionally render a component in React?

    • A

      Using if directly in return statement

    • B

      Using && or ternary operator inside JSX

    • C

      Using switch inside return

    • D

      Using console.log()

    Question 10

    What will be the output of this React code?
    import React from 'react';

    import ReactDOM from 'react-dom';

    function App() {

    const greeting = "Hello";

    return

    {greeting} World

    ;

    }

    ReactDOM.render(, document.getElementById('root'));


    • A

      Hello World

    • B

      {greeting} World

    • C

      "Hello World"

    • D

      Error

    There are 10 questions to complete.

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