React JS MCQs with answers Page - 3

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 these is a valid way to pass props to a component?

Code: 
<MyComponent title="React" />
  • (A) title: 'React'
  • (B) MyComponent.props('React')
  • (C) <MyComponent title="React" />
  • (D) MyComponent[title='React']

A

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Q. Which React hook is best suited for managing complex state logic?

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

A

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Q. Which of the following correctly describes React's data flow?

  • (A) Two-way binding
  • (B) Circular flow
  • (C) Unidirectional flow
  • (D) Bidirectional flow

A

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Q. Which statement about props is correct?

  • (A) Props are mutable
  • (B) Props can only be passed to class components
  • (C) Props help pass data to components
  • (D) Props are used to store state

A

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Q. What is the use of Fragment in React?

  • (A) To apply CSS styling
  • (B) To manage routing
  • (C) To wrap multiple elements without adding extra nodes to the DOM
  • (D) To format JSON data

A

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Q. What does the useMemo hook do?

  • (A) Returns a memoized callback
  • (B) Returns a memoized value
  • (C) Returns a cleanup function
  • (D) Returns a component

A

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Q. Which hook should be used to avoid re-creating functions on every render?

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

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Q. In which file is the root React component typically rendered?

  • (A) App.js
  • (B) Main.js
  • (C) Index.js
  • (D) Root.js

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Q. What does React.StrictMode do?

  • (A) Disables JSX
  • (B) Checks for potential problems in code
  • (C) Blocks state updates
  • (D) Optimizes rendering

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Q. Which method is used to update state in a class component?

  • (A) this.state
  • (B) setState
  • (C) updateState
  • (D) changeState

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