Quiz | Croma Campus

What is Redux?

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

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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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How do you handle user input in React?

Using state
Using props
Using methods
Using events

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What is a Higher-Order Component (HOC)?

A component that fetches data
A component that manages state
A function that returns a component
A component that handles events

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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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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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What is the purpose of ReactDOM.render?

To update the state
To create a component
To render a component to the DOM
To handle events

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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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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 componentDidUpdate?

To fetch data
To handle errors
To perform side effects after update
To update state

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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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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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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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Which method is used to handle state in functional components?

setState
useState
componentDidMount
render

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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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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 purpose of componentDidCatch?

To fetch data
To handle errors
To optimize performance
To update state

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Which lifecycle method is called when a component is removed from the DOM?

componentDidMount
componentWillUnmount
componentDidUpdate
render

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What is the purpose of useRef hook?

To create a reference
To handle state
To manage events
To pass props

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How do you access state in a class component?

this.state
this.props
this.setState
this.useState

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How do you handle asynchronous operations in React?

Using async/await
Using Promises
Using callback functions
All of the above

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How do you style components in React?

Using CSS
Using inline styles
Using styled-components
All of the above

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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 optimize a React application?

Using memoization
Using lazy loading
Using code splitting
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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How do you pass data to a child component?

Using states
Using methods
Using props
Using functions

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

Using refs
Using state
Using props
Using context

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

render
setState
forceUpdate
updateState

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What is the purpose of lazy and Suspense in React?

To optimize performance
To create a component
To handle errors
To lazy load components

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