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React Basics

1/25 React is mainly used for building ___.
- Database
- Connectivity
- User interface
- Design Platform
2/25 ___ can be done while multiple elements need to be returned from a component.
- Abstraction
- Packing
- Insulation
- Wrapping
3/25 Which of the following methods in a React Component is called after the component is rendered for the first time?
- componentDidUpdate
- componentDidMount
- componentMounted
- componentUpdated
4/25 What advantages does ReactJS have?
- Increases the application’s performance with Virtual DOM
- JSX makes a code that is easy to read and write
- It renders both on client and server side
- Easy to integrate with other frameworks(Angular, BackboneJS) since it is only a view library
- All of the above
5/25 What is ReactJS?
- Server side Framework
- User-interface framework
- Library for building interaction interfaces
6/25 In React, which method is used to create a context?
- React.createContext()
- React.createState()
- React.createComponent()
- React.createRef()
7/25 What does 'PureComponent' do in React?
- Manages pure functions
- Prevents re-rendering if props and state have not changed
- Cleans up the component
- Enhances component performance
8/25 How do you create a ref in a class component in React?
- React.createRef()
- React.ref()
- this.ref.create()
- new Ref()
9/25 What is the default port where a create-react-app project runs?
- 3000
- 8080
- 5000
- 8000
10/25 In React, what does the 'useEffect' hook do?
- Manages component lifecycle
- Handles state changes
- Creates a new effect
- None of the above
11/25 Which of the following is not a lifecycle method in React?
- componentDidMount
- shouldComponentRender
- componentWillUnmount
- getSnapshotBeforeUpdate
12/25 What is the correct syntax for a functional component in React?
- function MyComponent() { return <div />; }
- class MyComponent extends React.Component { render() { return <div />; }}
- const MyComponent = () => { return <div />; }
- var MyComponent = function() { return <div />; }
13/25 How do you pass a prop named 'data' to a component named 'MyComponent'?
- <MyComponent data={this.props.data} />
- <MyComponent props={data} />
- <MyComponent>{data}</MyComponent>
- <MyComponent data='data' />
14/25 What is the significance of the 'key' prop when rendering a list of items in React?
- It is used for styling the list items
- It helps React identify which items have changed
- It is a required prop for all list items
- It increases the rendering speed of the list
15/25 What is a 'prop' in React?
- A function inside a component
- A state variable in a component
- A read-only attribute used in a component
- A style attribute of HTML elements
16/25 What does 'props.children' represent in a React component?
- The state of the parent component
- The children passed to the component
- A type of React child component
- The props of the child components
17/25 What does 'React.Fragment' do?
- It groups a list of children without adding extra nodes to the DOM
- It is a method to optimize performance
- It is used to fragment a component into smaller components
- It is a way to render components asynchronously
18/25 What is the purpose of the 'useEffect' hook?
- To handle state changes
- To create a new component
- To perform side effects in functional components
- To connect to a Redux store
19/25 What is 'prop drilling' in React?
- Passing props through multiple layers of components
- A method to define PropTypes in a component
- Drilling down to find errors in props
- A React library for handling properties
20/25 In React, what is the purpose of the Context API?
- To manage global state
- To handle HTTP requests
- To connect to databases
- To optimize performance
21/25 How can you prevent a function from being called too frequently in React, such as during window resizing?
- Using shouldComponentUpdate
- Using PureComponent
- Using debounce or throttle techniques
- Using useEffect with an empty dependency array
22/25 How do you share state between two components that are not parent-child in React?
- Using global variables
- Using the Context API
- Passing props through intermediate components
- Using a state management library like Redux
23/25 What is the purpose of 'useReducer' in React?
- To handle component lifecycle
- For state management using a reducer function
- To reduce the bundle size of a React app
- To optimize rendering performance
24/25 What is JSX in React?
- A JavaScript-based styling language
- A syntax extension for JavaScript
- A new programming language based on JavaScript
- A framework for building user interfaces
25/25 How do you handle form submissions in React?
- Using an onSubmit event handler
- With a dedicated form management library
- By directly submitting to the server
- React does not support form submissions
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