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React JS

Quiz by Hardik Vedikin

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40 questions
Show answers
  • Q1
    What is React JS?
    A programming language
    A front-end framework
    A JavaScript library for building user interfaces
    A database management system
    30s
  • Q2
    What is JSX in React JS?
    A state management library
    A CSS-in-JS solution
    A server-side rendering technique
    A syntax extension for JavaScript
    30s
  • Q3
    What is a component in React JS?
    A server-side API
    A programming language feature
    A data structure
    A reusable and independent piece of UI
    30s
  • Q4
    What is the virtual DOM in React JS?
    A server-side rendering technique
    A JavaScript framework
    A design pattern for component structure
    A lightweight copy of the actual DOM
    30s
  • Q5
    What is the purpose of the 'state' in React JS?
    To handle server-side requests
    To define component structure and layout
    To manage component data and handle UI changes
    To manage routing and navigation
    30s
  • Q6
    What is the purpose of props in React JS?
    To manage component state
    To pass data from parent components to child components
    To handle asynchronous operations
    To define component styles and layout
    30s
  • Q7
    What is the lifecycle method used to perform side effects in React JS?
    componentDidUpdate
    render
    constructor
    componentDidMount
    30s
  • Q8
    What is the purpose of the useState hook in React JS?
    To add state to functional components
    To manage component routing
    To handle component props
    To define component lifecycle methods
    30s
  • Q9
    What is the purpose of the useEffect hook in React JS?
    To perform side effects in functional components
    To manage component routing
    To define component lifecycle methods
    To handle component props
    30s
  • Q10
    What is the purpose of the 'key' prop in React JS?
    To define component hierarchy
    To uniquely identify elements in a list
    To manage component state
    To specify component styling
    30s
  • Q11
    What is the purpose of the render() method in React JS?
    To render the component's HTML representation
    To define component properties
    To handle user interactions
    To handle component state changes
    30s
  • Q12
    What is the purpose of the useEffect() hook in React JS?
    To create reusable custom hooks
    To handle form validation
    To manage component state
    To perform side effects in functional components
    30s
  • Q13
    What is the purpose of the useState() hook in React JS?
    To create reusable custom hooks
    To handle component rendering
    To perform side effects
    To manage component state in functional components
    30s
  • Q14
    What is a React component?
    A database table
    A JavaScript function
    A reusable, self-contained piece of UI
    A CSS stylesheet
    30s
  • Q15
    What is the purpose of the useCallback() hook in React JS?
    To manage component state
    To memoize functions and optimize performance
    To perform side effects
    To handle component rendering
    30s

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