React JS MCQs with answers Page - 8

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. What does lifting state up mean in React?

  • (A) Creating global state
  • (B) Passing state to Redux
  • (C) Moving state to a common ancestor component
  • (D) Using local storage

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Q. What is a pure component?

  • (A) A component that uses only functional logic
  • (B) A component that does not re-render unnecessarily
  • (C) A component without any state
  • (D) A component with only props

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Q. How many root elements can a React component return?

  • (A) Multiple
  • (B) Only one
  • (C) Zero
  • (D) As many as you want

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Q. Which hook replaces lifecycle methods in functional components?

  • (A) useEffect
  • (B) useCallback
  • (C) useMemo
  • (D) useReducer

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Q. What happens if you use the same key for elements in a list?

  • (A) React warns but works fine
  • (B) Only the first element renders
  • (C) Unexpected behavior may occur
  • (D) Nothing happens

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Q. Which hook helps you prevent unnecessary function recreation?

  • (A) useRef
  • (B) useCallback
  • (C) useReducer
  • (D) useMemo

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Q. What is the main benefit of using React?

  • (A) Server-side rendering
  • (B) Fast and efficient UI updates
  • (C) Security
  • (D) Database support

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Q. What is the role of a key in a list of elements?

  • (A) To apply styles
  • (B) To identify which items changed
  • (C) To improve performance
  • (D) To bind events

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Q. What happens when setState is called?

  • (A) The component is replaced
  • (B) The component is re-rendered
  • (C) Nothing happens
  • (D) The whole DOM is rebuilt

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Q. How do you handle forms in React?

  • (A) Using traditional HTML methods
  • (B) Using refs only
  • (C) Using controlled components
  • (D) Only with third-party libraries

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