React Js Online Test


  • This practice test has 20 questions
  • You have to attempt all the questions
  • Time will be 05:00 minute for 20 questions. After 05:00 minute, practice test will be submitted automatically and you will redirect to result page.
  • This practice test is for self evalutation, if you get less marks then passing marks. Please prepare more for get excellent mark next time
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Time: 05:00 minutes Passing Marks: 60%

1. In functional components, which React hook replaces lifecycle methods like componentDidMount?

2. What is the role of Babel in the React ecosystem?

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

4. What is the recommended way to control the rendering of child components in React?

5. How does React determine when to load a lazily loaded component?

6. What is the recommended approach for structuring tests in a React application?

7. In React, what does "pre-rendering" refer to in the context of server-side rendering (SSR)?

8. Which of the following is NOT a common state management library for React?

9. What is "code splitting" in the context of React application deployment?

10. What is the purpose of the useEffect Hook in React?

11. Which tool is commonly used for inspecting and debugging React components in the browser?

12. What is the name of the React Native component that serves as the fundamental building block of UI in an app?

13. In React, how are events typically named?

14. What is the purpose of the useReducer Hook in React state management?

15. What is the role of Continuous Integration/Continuous Deployment (CI/CD) tools in React application deployment?

16. What is the key advantage of lazy loading components in a React application?

17. What is React Native primarily used for?

18. In React, how do you handle user input in controlled components?

19. Which of the following is NOT a valid Route component prop in React Router?

20. In React, which attribute is used to specify an event handler in JSX?