Quiz | Croma Campus

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 the useContext hook?

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

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Which hook is used for side effects in functional components?

useState
useEffect
useReducer
useContext

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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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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 create a context in React?

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

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What is JSX?

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

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How do you handle forms in React?

Using controlled components
Using uncontrolled components
Both A and B
Using state only

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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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How do you access state in a class component?

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

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What is the purpose of useCallback hook?

To memoize functions
To handle state
To handle events
To pass props

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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 lazy and Suspense in React?

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

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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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How do you update state in a functional component?

setState
updateState
changeState
setState

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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 handle errors in a React application?

Using error boundaries
Using try-catch
Using state
Using props

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What is the default port for a React development server?

3000
8000
8080
5000

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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 use of Fragment in React?

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

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

render
setState
forceUpdate
updateState

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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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What is the purpose of componentDidCatch?

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

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What is the purpose of useReducer hook?

To manage state
To handle events
To fetch data
To pass props

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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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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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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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How do you pass data to a child component?

Using states
Using methods
Using props
Using functions

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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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