Test Your React.js Expertise: 35+ Multiple Choice Questions

Challenge your understanding of React.js with this comprehensive multiple-choice quiz. These questions cover a wide range of topics, from fundamental concepts to more advanced techniques, helping you assess your React.js knowledge and identify areas for further learning.

35+ React.js Multiple Choice Questions

Test your React.js knowledge with these multiple-choice questions!

Questions and Answers

1) What is the correct name for React.js?

  • React
  • React.js
  • ReactJS
  • All of the above

2) What are some advantages of React.js?

  • Improved performance with Virtual DOM.
  • Easy integration with other frameworks.
  • Client and server-side rendering.
  • All of the above

3) Which of the following is NOT a disadvantage of React.js?

  • React.js handles only the view layer.
  • React.js has a large library.
  • JSX makes code easy to read and write.
  • React.js has a steep learning curve.

4) How do you install create-react-app?

  • npm install -g create-react-app
  • npm install create-react-app
  • npm install -f create-react-app
  • install -g create-react-app

5) What improves performance in React.js?

  • Original DOM
  • Virtual DOM
  • Both A and B
  • None of the above

6) What keyword is used to define a class in JavaScript (instead of `function`)?

  • Constructor
  • Class
  • Object
  • DataObject

7) What acts as the input for a class-based component?

  • Class
  • Factory
  • Render
  • Props

8) What keyword is used for class inheritance?

  • Create
  • Inherits
  • Extends
  • This

9) What's the output of this code? 

var Helloword = (props) => {
  return (
    <div>Hello World 1</div>
    <div>Hello World 2</div>
  );
};
ReactDOM.render(<Helloword />, mountNode);

  • Hello World 1
  • Hello World 2
  • Hello World 1 Hello World 2
  • Error

10) What's the default port for webpack-dev-server?

  • 3000
  • 8080
  • 3030
  • 6060