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What is the purpose of useCallback hook?

To memoize functions
To memoize values
To handle side effects
To fetch data

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What is the purpose of PropTypes in React?

To specify the type of data expected in props
To define the initial state of a component
To manage component input
To handle component events

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What is the purpose of render props in React?

To share logic between components
To manage state
To handle side effects
To fetch data

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What is the purpose of the 'getDerivedStateFromProps' method in React?

To update the component's state based on props changes
To initialize the component's state
To perform side effects after rendering
To handle component errors

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What is JSX?

A JavaScript syntax extension
A type of database
A CSS preprocessor
A testing framework

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In React, how can you conditionally render components?

Using if-else statements
Using switch statements
Using ternary operators
All of the above

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What is the purpose of the 'useCallback' Hook in React?

To memoize expensive calculations
To update the component's state
To handle component errors
To perform side effects in function components

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What is the context API used for?

State management across components
DOM manipulation
CSS styling
Server-side rendering

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How do you handle errors in React components?

Using componentDidCatch
Using useEffect
Using useState
Using render

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Which lifecycle method is invoked immediately after updating occurs in React?

componentWillUpdate()
componentDidUpdate()
componentWillMount()
componentDidMount

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What does JSX stand for in React.js?

JavaScript XML
JavaScript Extension
JavaScript XQuery
JavaScript External

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What is a pure component in React?

A component with no side effects
A component that only re-renders when its props change
A component that always re-renders
A component that fetches data

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How do you handle events in React?

Using addEventListener
Using on prefix in JSX
Using handleEvent method
Using event method

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In React, what is the purpose of the 'useRef' Hook?

To reference DOM elements or React components
To define the initial state of a component
To update the component's props
To perform side effects in function components

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Which of the following methods is called after the component is rendered in React?

componentWillMount()
omponentDidMount()
componentDidUpdate()
componentWillReceiveProps

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How do you handle forms with controlled components?

Using value and onChange props
Using defaultValue prop
Using setState
Using useEffect

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What is a portal in React?

A way to render children into a DOM node outside the parent component
A way to handle events
A way to manage state
A way to fetch data

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What is the purpose of state in React?

To store props
To store component metadata
To manage component input
To manage component data that may change

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In React, what is the purpose of the 'static getDerivedStateFromError' method?

To update the component's state based on errors
To initialize the component's state
To perform cleanup after an error occurs
To handle errors that occur during rendering

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What is Redux used for?

State management
Routing
CSS styling
API calls

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Which of the following is NOT a way to handle events in React?

Inline event handlers
Event delegation
Event listeners
Synthetic events

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What does the useEffect hook do?

Manages state
Fetches data
Performs side effects in components
Defines components

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What is the purpose of the 'componentWillReceiveProps' method in React?

To update the component's props
To initialize the component's state
To perform cleanup before the component is removed
To handle errors during rendering

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What is the purpose of the 'useMemo' Hook in React?

To memoize expensive calculations
To update the component's state
To handle component errors
To perform side effects in function components

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Which of the following methods is used to update the state based on the previous state in React?

this.updateState()
this.setState()
this.changeState()
this.modifyState

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What is the purpose of StrictMode in React?

To highlight potential problems
To manage state
To fetch data
To handle errors

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How do you connect a React component to the Redux store?

Using connect
Using useState
Using useEffect
Using useContext

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Which of the following methods is used to perform side effects in React?

componentDidMount()
componentDidUpdate()
componentWillUnmount()
All of the above

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In React, what is the purpose of the 'useReducer' Hook?

To handle component errors
To manage complex state logic
To define the initial state of a component
To perform side effects in function components

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Which of the following is NOT a built-in Hook in React?

useCallback
useMemo
useState
useComponent

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