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 are the advantages of using the Redux library in a React application?

To simplify state management and make it predictable

To eliminate the need for component state

To handle form validation in React

To optimize rendering performance

3. What is the role of the dangerouslySetInnerHTML prop in React?

To set the component's initial state

To handle context API

To update the virtual DOM

To render HTML content dangerously

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. What does the term 'props drilling' refer to in React?

Passing data from child to parent components

Passing data through multiple layers of components

Passing data from parent to child components

Passing data using context API

6. What is the purpose of the useLayoutEffect hook in React, and how does it differ from useEffect?

To handle layout changes and synchronously apply effects

To manage component state during layout updates

To define the component's initial state

To handle asynchronous operations in functional components

7. What is the significance of the React Fragment?

It represents a virtual DOM element

It is used to create JSX fragments

It defines the lifecycle of a component

It is a replacement for the div element

8. Explain the concept of server-side rendering (SSR) in React and its advantages.

SSR is a technique to render React components on the server and send HTML to the client

SSR is used for handling client-side routing in React

SSR is a replacement for the useEffect hook

SSR eliminates the need for component state

9. How does React handle prop drilling?

By passing props through multiple components

By avoiding the use of props

By directly modifying parent components

By using Redux for state management

10. 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

11. Explain the concept of controlled components in React.

Components that are directly manipulated by the DOM

Components that maintain their own state

Components that rely on Redux for state management

Components that receive props from parent components

12. What is the purpose of the key prop in React lists?

It sets the background color of elements

It defines the order of elements

It is used for styling purposes

It uniquely identifies elements in an array

13. How can you handle events in React?

By using the onClick event

By using the bind method

By using the addEventListener method

By using the onEvent prop

14. How can you update the state based on the previous state in React?

By using the setState() method

By using the getSnapshotBeforeUpdate method

By using the useReducer hook

By passing a function to the setState() method

15. What are Higher Order Components (HOCs) in React, and how do they work?

Components with a higher level of complexity

Components that use hooks extensively

Functions that return components with enhanced functionality

Components that follow a specific naming convention

16. Explain the concept of code splitting in React and how it can improve application performance.

Code splitting is a method for writing concise React components

Code splitting is a feature of React Lazy

Code splitting is a technique to divide the application code into smaller chunks

Code splitting has no impact on application performance

17. What is the role of the arrow function in React?

To create components

To bind event handlers

To define state

To initialize props

18. 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

19. 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

20. What is the purpose of the React.StrictMode component, and when should it be used?

To define strict coding rules for React components

To optimize rendering performance in React

To catch common coding mistakes and potential issues early

To handle routing in React applications

React MCQ Test 4