React MCQ Quiz | Set – 02Piyush PatilMay 8, 2023React Quiz, Quizzes Share your love 51 Created on May 04, 2023 By Piyush PatilReact Quiz | Set - 2 1 / 20What is a React component? A programming language A function or class that returns JSX to define a UI element A database management system A virtual DOM element 2 / 20What is the purpose of the render() method in a React component? To define the component's state To define the component's lifecycle methods To return JSX that describes the component's UI To define the component's props 3 / 20What is the difference between a controlled and uncontrolled component in React? A controlled component is managed by the React state, while an uncontrolled component is not. A controlled component is not managed by the React state, while an uncontrolled component is. There is no difference between a controlled and uncontrolled component in React. A controlled component is only used in functional components, while an uncontrolled component is only used in class components. 4 / 20 What is the purpose of React Router? To manage a component's state To handle server-side rendering To handle client-side routing in a single-page application To handle form validation in React 5 / 20Which of the following is a valid way to create a new React component? function myComponent(props) {} class myComponent extends React.Component {} const myComponent = React.createClass({}) All of the above 6 / 20 What is the purpose of the shouldComponentUpdate() method in React? To update the component's state To handle event listeners To determine if the component should re-render To manage the component's lifecycle methods 7 / 20What is the purpose of the key attribute in React? To identify individual elements in a list or collection To manage a component's internal state To handle form submission To create a unique identifier for each component 8 / 20What is the difference between state and props in React? Props are mutable, while state is immutable. State is passed down from parent components, while props are managed within a component. Props are used to manage a component's internal data, while state is used to pass data between components. 9 / 20Which of the following is not a valid way to update a component's state in React? this.setState({ count: this.state.count + 1 }) this.state.count++ this.setState(prevState => ({ count: prevState.count + 1 })) this.setState({}) 10 / 20What is the difference between React and React Native? React is a library for building user interfaces in web applications, while React Native is a framework for building native mobile applications. React is a programming language, while React Native is a database management system. React is a markup language for building UI components, while React Native is a styling framework. There is no difference between React and React Native. 11 / 20What is the purpose of the ref attribute in React? To reference a component's parent To reference a component's children To reference a DOM element or component instance To reference a React Router route 12 / 20What is the purpose of the React Developer Tools browser extension? To provide a way to debug React applications in the browser To manage a component's state To handle form validation in React To optimize performance in React applications 13 / 20What is the purpose of the componentDidCatch() method in React? To update the component's state To manage the component's lifecycle methods To handle errors in the component tree below the current component To handle form submission 14 / 20Which of the following is a valid way to define a React propType? PropTypes.arrayOf() PropTypes.oneOf() PropTypes.shape() All of the above 15 / 20What is the purpose of the react-dom package? To provide a way to debug React applications in the browser To provide a way to render React components to the DOM To manage a component's state To handle form validation in React 16 / 20What is Redux in React? A styling framework A library for managing state in React applications A database management system A React component 17 / 20What is the purpose of the shouldComponentUpdate() method in React? To update the component's state To handle event listeners To determine if the component should re-render 18 / 20What is JSX in React? A styling framework A database management system A templating language for writing HTML-like syntax in JavaScript A React component 19 / 20What is the purpose of the React Context API? To manage a component's internal state To provide a way to handle form submission To pass data down through the component tree without having to pass props manually at every level To provide a way to handle events in a React application 20 / 20What is the purpose of the React Fragment component? To group a list of child elements without adding extra nodes to the DOM To manage a component's internal state To handle form validation in React To optimize performance in React applications Your score isThe average score is 63% LinkedIn Facebook Twitter VKontakte 0% Restart quiz Share your love Previous Post Donut Truck Illustration using HTML and CSS Next Post Digital Clock using HTML CSS and JavaScript
Web Development MCQ Quiz For Beginners 2024Piyush PatilJanuary 29, 2024HTML & CSS, Beginner, CSS Quiz, Frontend, HTML Quiz, JavaScript, JavaScript Quiz, Quizzes, Web Development
JavaScript MCQ Quiz | Set – 03Piyush PatilJanuary 9, 2024JavaScript Quiz, HTML & CSS, JavaScript Games, Quizzes
