React JS MCQs with answers Page - 4

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 is NOT a React hook?

  • (A) useContext
  • (B) useFetch
  • (C) useReducer
  • (D) useEffect

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Q. What is the purpose of useContext in React?

  • (A) To manage routing
  • (B) To fetch data
  • (C) To access context values
  • (D) To handle forms

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Q. What is the default behavior of React when state changes?

  • (A) It re-renders only the changed component
  • (B) It re-renders the whole application
  • (C) It manually updates the DOM
  • (D) It blocks rendering

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Q. What is a controlled component in React?

  • (A) A component that controls another
  • (B) A component with its own state
  • (C) A form element controlled by React state
  • (D) A static component

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Q. Which of the following is true about React keys in a list?

  • (A) They can be duplicated
  • (B) They should be the index of the array always
  • (C) They must be unique among siblings
  • (D) They are optional

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Q. What does JSX stand for?

  • (A) JavaScript Xtreme
  • (B) JavaScript XML
  • (C) Java Simple Extension
  • (D) Java Syntax Extension

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Q. How do you pass a function as a prop in React?

  • (A) <Comp func='handleClick' />
  • (B) <Comp func={handleClick} />
  • (C) <Comp>handleClick</Comp>
  • (D) <Comp.handleClick />

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Q. When using useEffect with an empty dependency array, how often does it run?

  • (A) On every render
  • (B) Only on unmount
  • (C) Once after the initial render
  • (D) Every 5 seconds

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Q. What is React Router used for?

  • (A) Fetching data
  • (B) State management
  • (C) Client-side routing
  • (D) Form validation

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Q. Which package is commonly used for form handling in React?

  • (A) formik
  • (B) redux
  • (C) react-dom
  • (D) axios

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