React JS MCQs with answers Page - 5

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 of the following best describes React?

  • (A) A full-stack framework
  • (B) A library for building user interfaces
  • (C) A server-side rendering engine
  • (D) A CSS framework

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Q. Which hook is used to memoize a callback function in React?

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

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Q. Which React hook is used to store and persist a reference across renders?

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

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Q. Which statement is true about state in React?

  • (A) State can be changed directly
  • (B) State updates are synchronous
  • (C) State should be immutable
  • (D) State is used only in class components

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Q. What will happen if you forget to include a key in a list item?

  • (A) React will crash
  • (B) Nothing, it's optional
  • (C) React will throw an error
  • (D) React may render inefficiently

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Q. What is the role of defaultProps in React?

  • (A) To define required props
  • (B) To apply default values to props
  • (C) To validate prop types
  • (D) To override parent props

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Q. Which of the following is a valid custom hook name?

  • (A) useLogin
  • (B) LoginHook
  • (C) myHook
  • (D) hookUse

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Q. How can you conditionally render a component in React?

  • (A) Using if statement outside JSX
  • (B) Using ternary operator or logical && inside JSX
  • (C) Using a loop
  • (D) You cannot conditionally render in React

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Q. Which of the following is used to install React?

  • (A) npm install create-react-app
  • (B) npm create react-app
  • (C) npx create-react-app
  • (D) npx init react

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Q. Which tag is necessary to wrap multiple elements in JSX?

  • (A) <div>
  • (B) <section>
  • (C) <React.Fragment>
  • (D) All of the above

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