Supreme React Test - 72+ MCQs: React test: Evaluate Your Proficiency with React Questions and Answers

1. Explain the concept of server components in React and how they differ from traditional components.

Server components are components rendered on the server and sent to the client as HTML

Server components are a replacement for the useEffect hook

Server components are used for handling client-side routing in React

Server components have no impact on rendering performance

2. What is the significance of the React memo function, and how can it optimize performance?

React memo is used for styling in React components

React memo allows the creation of reusable components

React memo is a replacement for the shouldComponentUpdate method

React memo prevents unnecessary re-rendering of functional components

3. In React, what is the role of the render() method?

To update the component's state

To render JSX elements

To handle user interactions

To define component properties

4. What is the purpose of the Redux library in React applications?

To manage component state

To handle routing

To simplify state management

To style React components

5. Explain the concept of render props in React and provide a scenario where they are beneficial.

Render props are functions passed as props that return React elements

Render props are used for component styling

Render props are an alternative to using state in React

Render props are only applicable in class components

6. How does React Router improve the navigation experience in a React application?

By providing a built-in state management system

By allowing the use of global variables for navigation

By synchronizing the UI with the URL

By preventing the use of dynamic routes

7. How can you handle forms in React?

Using the form tag

Using the state object

Using the onSubmit event

Using the submit() method

8. Explain the concept of React Hooks rules, and why is it essential to follow them?

Rules that dictate the naming convention of hooks

Guidelines for using hooks within class components

Guidelines for using hooks within functional components

Rules that define the lifecycle of a hook

9. How can you implement server-side rendering (SSR) with data fetching in a React application?

By using the useEffect hook for data fetching

By relying solely on client-side rendering for data fetching

By incorporating the useTransition hook for server-side rendering

By using a library like Next.js for server-side rendering

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

To perform side effects in function components

To define the component's initial state

To handle component rendering

To manage component lifecycle

React MCQ Test 5