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How do you create a Higher-Order Component?

By wrapping a component with a function
By using a class component
By using a functional component
By using hooks

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What is the virtual DOM?

A browser feature
A programming language
A lightweight copy of the real DOM
A server-side technology

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How do you handle errors in a React application?

Using error boundaries
Using try-catch
Using state
Using props

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How do you create a React component?

By defining a class
By defining a function
By using HTML tags
Both A and B

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Which of the following is true about React?

It is a framework
It is a library
It is a language
It is a template engine

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What is JSX?

A templating language
A JavaScript syntax extension
A CSS preprocessor
A JavaScript library

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Which method is used to re-render a class component?

render
setState
forceUpdate
updateState

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Which command is used to create a new React application?

create-react-app
npm init
react-init
npx create-react-app

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What is the use of Fragment in React?

To group multiple elements
To style components
To manage state
To handle events

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What is Redux?

A library for managing state
A CSS framework
A React component
A testing library

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How do you update state in a functional component?

setState
updateState
changeState
setState

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Which hook is used for side effects in functional components?

useState
useEffect
useReducer
useContext

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How do you handle routing in a React application?

Using react-router
Using URL paths
Using HTML tags
Using props

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What is the purpose of the useContext hook?

To manage state
To handle events
To pass data through component tree
To fetch data

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What is the purpose of React.memo?

To optimize performance
To create a memo
To store values
To manage state

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How do you implement context in a class component?

Using React.createContext
Using React.ContextType
Using React.createState
Using React.createElement

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How do you access a child component's methods in React?

Using refs
Using state
Using props
Using context

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How do you create a context in React?

Using React.createContext
Using React.createState
Using React.createEvent
Using React.createElement

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Which of the following is a valid way to handle forms in React?

Using controlled components
Using uncontrolled components
Using HTML forms
Both A and B

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What is the purpose of useMemo hook?

To memoize values
To handle state
To handle events
To pass props

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How do you conditionally render a component?

Using if-else statements
Using ternary operator
Using && operator
All of the above

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How do you fetch data in a React component?

Using fetch API
Using Axios
Both A and B
Using state

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How do you create a portal in React?

Using React.createPortal
Using React.createElement
Using React.createState
Using ReactDOM.render

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What is the use of the key prop in lists?

To identify unique elements
To reorder elements
To add styles to elements
To handle events

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What is the purpose of getDerivedStateFromProps?

To fetch data
To update state based on props
To handle events
To optimize performance

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How do you implement code splitting in a React application?

Using dynamic import
Using React.lazy
Using Suspense
All of the above

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What is the purpose of prop-types?

To handle state
To enforce type checking
To fetch data
To create components

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What is the default port for a React development server?

3000
8000
8080
5000

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What is the purpose of React?

To manage databases
To build user interfaces
To style web pages
To write server-side code

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What is the use of componentDidMount?

To handle events
To fetch data after component mounts
To initialize state
To bind methods

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