React JS MCQs with answers Page - 7

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. How can we prevent a component from re-rendering?

  • (A) Using useMemo only
  • (B) Using memo for functional components
  • (C) Avoid using props
  • (D) Using useEffect only

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Q. What is the default port for React development server?

  • (A) 3000
  • (B) 8080
  • (C) 5000
  • (D) 8000

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Q. Which of these is used to style React components?

  • (A) CSS
  • (B) Inline styles
  • (C) Styled-components
  • (D) All of the above

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Q. What will happen if a hook is used inside a conditional statement?

  • (A) It will work fine
  • (B) React will ignore it
  • (C) React will throw an error
  • (D) It will be skipped on first render

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Q. What is the key difference between props and state in React?

  • (A) Props are mutable, state is immutable
  • (B) Props are used for internal data, state for external
  • (C) Props are passed, state is managed internally
  • (D) No difference

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Q. Which hook should you use to manage complex state logic?

  • (A) useState
  • (B) useRef
  • (C) useEffect
  • (D) useReducer

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Q. What is returned by the useState hook?

  • (A) Only the current state value
  • (B) A function to update the state
  • (C) An array with current state and setter function
  • (D) A single object

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

  • (A) Using props
  • (B) Using state
  • (C) Using callback functions
  • (D) Using refs

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Q. What is JSX?

  • (A) A templating engine
  • (B) A syntax extension for JavaScript
  • (C) A CSS preprocessor
  • (D) A database language

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Q. Which method is used to pass props to a component?

  • (A) this.props()
  • (B) props.push()
  • (C) Passing them as attributes
  • (D) props.assign()

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