Quiz | Croma Campus

What is the purpose of React?

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

Mark for review

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

componentDidMount
componentWillUnmount
componentDidUpdate
render

Mark for review

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

Mark for review

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

Mark for review

What is the virtual DOM?

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

Mark for review

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

Using refs
Using state
Using props
Using context

Mark for review

How do you handle errors in a React application?

Using error boundaries
Using try-catch
Using state
Using props

Mark for review

What is the purpose of getDerivedStateFromProps?

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

Mark for review

How do you conditionally render a component?

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

Mark for review

What is the purpose of React.memo?

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

Mark for review

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

Mark for review

What is the purpose of useReducer hook?

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

Mark for review

What is the purpose of componentDidCatch?

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

Mark for review

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

Mark for review

What is the purpose of prop-types?

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

Mark for review

How do you pass data to a child component?

Using states
Using methods
Using props
Using functions

Mark for review

How do you create a portal in React?

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

Mark for review

What is the purpose of componentDidUpdate?

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

Mark for review

What is JSX?

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

Mark for review

How do you handle user input in React?

Using state
Using props
Using methods
Using events

Mark for review

What is the purpose of lazy and Suspense in React?

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

Mark for review

How do you optimize a React application?

Using memoization
Using lazy loading
Using code splitting
All of the above

Mark for review

How do you fetch data in a React component?

Using fetch API
Using Axios
Both A and B
Using state

Mark for review

How do you make a network request in React?

Using fetch API
Using Axios
Both A and B
Using state

Mark for review

What is the use of Fragment in React?

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

Mark for review

How do you handle routing in a React application?

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

Mark for review

What is the purpose of useRef hook?

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

Mark for review

What is the purpose of ReactDOM.hydrate?

To render a React application on the client side
To render a React application on the server side
To render a static site
To optimize performance

Mark for review

How do you access state in a class component?

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

Mark for review

How do you handle asynchronous operations in React?

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

Mark for review

Online Exam Quiz

Online

Did you like this Question

Get a 1:1 Mentorship call with our Career Advisor