250+ React Js MCQ With Online Practice Test

React.js, often simply called React, is a highly popular JavaScript library for building user interfaces. Developed and maintained by Facebook, React is renowned for its component-based architecture and the ability to efficiently update and render components when data changes. It is a foundational tool for developing modern web and mobile applications, allowing developers to create dynamic and interactive user interfaces with ease. React's vast ecosystem, including tools like React Native for mobile app development, makes it a top choice for frontend development and a key player in the world of web technologies.

Practice Test

11. What are React components primarily used for?

Answer: Defining the structure of web pages

12. In React, what is a component?

Answer: A functional unit of user interface

13. Which of the following is true about React components?

Answer: They can be nested within other components

14. What is the purpose of the render method in a React component?

Answer: To render the component's UI

15. How can you pass data from a parent component to a child component in React?

Answer: By using props

16. What is the key benefit of using functional components in React?

Answer: They have better performance than class components

17. Which React hook is used for managing state in functional components?

Answer: useState

18. What does the term "props" stand for in React?

Answer: Properties

19. In React, what is the purpose of the constructor method in a class component?

Answer: To initialize component state

20. What is the primary difference between class components and functional components in React?

Answer: Functional components use hooks
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React Js Multiple Choice Questions React Js MCQ React Js Interview Questions With Answers