React.js Interview Questions Quiz Part 1

Are you preparing for a React.js interview?

Test your skills with this quiz and see how well you know the fundamentals of React.js. These 10 questions are designed to challenge both beginners and intermediate developers, helping you identify areas where you might need more practice.

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Created on October 01, 2024 By PC Prajapat

React.js Interview Questions Quiz Part 1

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1 / 10

1. What is React?

A) A back-end framework

B) A front-end library

C) A database management system

D) A full-stack framework

2 / 10

2. What is JSX in React?

A) A JavaScript extension used to write HTML in React

B) A new version of JavaScript

C) A CSS preprocessor

D) A database query language

3 / 10

3. Which of the following is used to manage state in React?

A) setState

B) useEffect

C) useState

D) componentDidMount

4 / 10

4. What is the use of useEffect hook in React?

A) To directly manipulate the DOM

B) To handle side effects in a component

C) To create class components

D) To initialize state in functional components

5 / 10

5. What does the key prop do in React?

A) Improves accessibility

B) Helps React identify which items have changed

C) Improves the styling of components

D) Prevents memory leaks

6 / 10

6. Which method is used to update the state in a class component?

A) this. Update()

B) this.setState()

C) this.changeState()

D) this.modifyState()

7 / 10

7. What is the purpose of React.Fragment?

A) To create a fragment of the component tree

B) To group multiple elements without adding extra nodes to the DOM

C) To fetch data from APIs

D) To replace class components

8 / 10

8. Which of the following is NOT a lifecycle method in React?

A) componentDidMount

B) componentWillUnmount

C) shouldComponentUpdate

D) useContext

9 / 10

9. What is the virtual DOM in React?

A) A direct representation of the actual DOM

B) An in-memory representation of the real DOM

C) A server-side rendering feature

D) A new type of DOM introduced in ECMAScript 6

10 / 10

10. How do you lift state up in React?

A) By using the useReducer hook

B) By passing state from parent to child

C) By moving state to the closest common ancestor component

D) By using React.Context

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