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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.

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