admin Oct, Fri, 2024 EXAM REACT JS PROGRAMMING EXAM 123456789101112131415161718192021222324252627282930 Exam Instructions: Total Number of Questions: 30 You will be required to answer a total of 30 multiple-choice questions. Time Limit: 15 minutes for the entire exam Once the time is up, the exam will automatically submit. Passing Criteria: A minimum score of 50% is required to pass the exam Multiple Attempts: You are allowed to take the exam multiple times. Only your highest score will be considered for certification. Additional Instructions: The exam timer cannot be paused once it begins. Good luck, and feel free to retake the exam to improve your score! REACT JS PROGRAMMING EXAM Test your REACT JS skills with a challenging exam designed to evaluate your knowledge in programming, data structures, and algorithms The certificate will be generated based on the information you provide in the form, so please ensure that all details are entered correctly. NameEmailPhone NumberUniversityCollegeDegreeDepartmentPass Out YearPass Out Year2014201520162017201820192020202120222023202420252026202720282029 1 / 30 1) What does React.memo do? A) To manage state B) To handle events C) To optimize functional components D) To create context 2 / 30 2) How can you create a collapsible panel in React? A) By managing open/closed state B) By using local storage C) By using static content only D) By modifying the DOM directly 3 / 30 3) What is the purpose of the useSyncExternalStore hook? A) To manage state B) To handle events C) To synchronize state with external stores D) To modify the DOM directly 4 / 30 4) What does useTransition do in React? A) To manage local state B) To handle asynchronous updates C) To mark updates as non-urgent D) To manage context 5 / 30 5) What is the purpose of useImperativeHandle in React? A) To manage state B) To optimize rendering C) To customize ref instance value D) To handle events 6 / 30 6) How can you create a toast notification in React? A) By managing visibility and message in state B) By using local storage C) By using static content only D) By modifying the DOM directly 7 / 30 7) How can you implement a confirmation dialog in React? A) By managing open state B) By using local storage C) By using static content only D) By modifying the DOM directly 8 / 30 8) What is the significance of the ref attribute in React? A) To manage state B) To handle events C) To get a reference for manipulation D) To manage props 9 / 30 9) What is the purpose of React.createContext? A) To manage state B) To handle events C) To create a context object for value sharing D) To optimize performance 10 / 30 10) How do you create a reusable input component in React? A) By using local storage B) By using static inputs only C) By defining a functional component with props D) By modifying the DOM directly 11 / 30 11) How can you implement a toast notification in React? A) By managing visibility state B) By using local storage C) By hardcoding notifications D) By modifying the DOM directly 12 / 30 12) What are props in React? A) Component methods B) Class variables C) Inputs to a React component D) State variables 13 / 30 13) What is the purpose of useCallback in React? A) Returns a memoized callback function B) Prevents re-renders C) Manages state D) Modifies the DOM directly 14 / 30 14) What does the React.Fragment component do? A) To manage state B) To handle events C) To group children without additional nodes D) To optimize performance 15 / 30 15) How do you create a custom hook in React? A) By using class components B) By using static methods C) By defining a function that uses built-in hooks D) By modifying the DOM directly 16 / 30 16) How can you implement a multi-step form in React? A) By using local storage B) By using static content only C) By managing current step state and rendering conditionally D) By modifying the DOM directly 17 / 30 17) What is the role of useContext? A) To manage state B) Allows functional components to access context C) Handles events D) Modifies the DOM directly 18 / 30 18) What is a higher-order component (HOC)? A) A class component B) A function that returns a component C) A component that manages state D) A function that takes a component and returns a new component 19 / 30 19) What is the purpose of React.PureComponent? A) To manage state B) To handle events C) To optimize rendering D) To create context 20 / 30 20) What does the contextType property do? A) Allows class components to consume context B) Manages state C) Handles events D) Modifies the DOM directly 21 / 30 21) What is the significance of the useRef hook? A) To manage state B) To handle events C) To create a mutable reference that persists across renders D) To optimize performance 22 / 30 22) How do you implement lazy loading images in React? A) By using the IntersectionObserver API B) By hardcoding images C) By ignoring visibility D) By modifying the DOM directly 23 / 30 23) How can you create a file upload component in React? A) By managing file input state B) By using local storage C) By hardcoding file inputs D) By modifying the DOM directly 24 / 30 24) How can you create a loading indicator in React? A) By managing loading state B) By using local storage C) By using static content only D) By modifying the DOM directly 25 / 30 25) What is the significance of the render method in class components? A) To manage state B) To handle events C) To return JSX for rendering D) To fetch data 26 / 30 26) How can you implement pagination in a React application? A) By modifying the DOM B) By dividing data into pages C) By using local storage D) By loading all data at once 27 / 30 27) What is the significance of the key prop in lists? A) To manage state B) To handle events C) To group children without additional nodes D) To track list item changes 28 / 30 28) How can you implement a rating component in React? A) By managing state and rendering stars/icons B) By using local storage C) By using static content only D) By modifying the DOM directly 29 / 30 29) What is the role of useRef in React? A) Creates a mutable ref object B) Manages state C) Handles events D) Modifies the DOM directly 30 / 30 30) What does ReactDOM.render() do? A) Renders a React component into the DOM B) Prevents rendering C) Manages state D) Modifies the DOM directly Your score is LinkedIn Facebook Twitter VKontakte 0% ExamWEB DEVELOPMENT EXAM...Read MoreREACT JS PROGRAMMING EXAM...Read MorePYTHON FULL STACK...Read MorePYTHON EXAMS ...Read MoreMYSQL...Read MoreMACHINE LEARNING...Read MoreJAVASCRIPT PROGRAMMING EXAM...Read MoreJAVA SPRING BOOT...Read MoreJAVA PROGRAMMING EXAM...Read MoreJAVA FULL STACK...Read MoreHTML PROGRAMMING EXAM...Read MoreDEEP LEARNING...Read MoreDATA SCIENCE...Read MoreCSS PROGRAMMING EXAM...Read MoreANGULAR JS PROGRAMMING EXAM...Read More 16Share on WhatsApp10Share on LinkedIn5Share on YouTube9Share on Facebook Comments 0
