React JS MCQs with answers Page - 20

Here, you will find a collection of MCQ questions on React JS. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. Which lifecycle method is deprecated in React 17?

  • (A) componentDidMount
  • (B) componentWillMount
  • (C) componentDidUpdate
  • (D) componentWillUnmount

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Q. Which tool helps to inspect React component hierarchies in browser?

  • (A) Redux DevTools
  • (B) React Developer Tools
  • (C) Chrome DevTools
  • (D) React Profiler

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Q. What is JSX transpiled to?

  • (A) HTML strings
  • (B) JavaScript function calls
  • (C) CSS classes
  • (D) React Components

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Q. How do you pass data from a child component to a parent component?

  • (A) Using props
  • (B) Using callback functions passed as props
  • (C) Using useState hook in child
  • (D) Using componentDidMount

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Q. What is the recommended way to handle forms in React?

  • (A) Using controlled components
  • (B) Using uncontrolled components only
  • (C) Using direct DOM manipulation
  • (D) Not recommended to handle forms

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Q. What happens if a component returns null?

  • (A) Nothing is rendered
  • (B) An error occurs
  • (C) An empty div is rendered
  • (D) The component re-renders infinitely

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Q. Which of these is NOT a feature of React?

  • (A) Component-based architecture
  • (B) Two-way data binding
  • (C) Virtual DOM
  • (D) JSX syntax

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Q. What is the primary purpose of the React key prop?

  • (A) To uniquely identify elements in a list for efficient re-rendering
  • (B) To add CSS styles
  • (C) To bind event handlers
  • (D) To pass data to child components

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Q. What hook would you use to perform side effects in functional components?

  • (A) useEffect
  • (B) useState
  • (C) useMemo
  • (D) useContext

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Q. Which of the following is true about React Context API?

  • (A) It provides a way to pass data through the component tree without passing props manually at every level
  • (B) It replaces Redux
  • (C) It is used for styling components
  • (D) It only works with class components

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