React JS MCQs with answers Page - 25

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.

To check the correct answer, simply click the View Answer button provided for each question.

Have your own questions to contribute? Click the button below to share your MCQs with others!

+ Add Question

A

Admin • 831.35K Points
Coach

Q. What is the primary role of React Router in React applications?

  • (A) To manage navigation and URL routing
  • (B) To handle HTTP requests
  • (C) To style components
  • (D) To manage component state

A

Admin • 831.35K Points
Coach

Q. How do you create a context in React?

  • (A) Using React.createContext()
  • (B) Using React.createComponent()
  • (C) Using React.useContext()
  • (D) Using React.Context()

A

Admin • 831.35K Points
Coach

Q. Which hook would you use to perform side effects such as data fetching in functional components?

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

A

Admin • 831.35K Points
Coach

Q. What does React.Fragment help you do?

  • (A) Group multiple elements without adding extra nodes to the DOM
  • (B) Create new components
  • (C) Manage state across components
  • (D) Handle errors in components

A

Admin • 831.35K Points
Coach

Q. Which attribute is used to specify inline styles in React?

  • (A) style (with an object)
  • (B) class
  • (C) className
  • (D) css

A

Admin • 831.35K Points
Coach

Q. What is reconciliation in React?

  • (A) The process React uses to update the DOM efficiently
  • (B) The process of combining components
  • (C) Merging CSS styles
  • (D) Handling user inputs

A

Admin • 831.35K Points
Coach

Q. Which of these is a way to handle events in React?

  • (A) Using camelCase syntax like onClick
  • (B) Using lowercase like onclick
  • (C) Using jQuery event handlers
  • (D) Using HTML event attributes

A

Admin • 831.35K Points
Coach

Q. In React, which statement about props is correct?

  • (A) Props are read-only and should not be modified by the component receiving them
  • (B) Props can be modified inside the child component
  • (C) Props are used to manage component state
  • (D) Props are only used in class components

A

Admin • 831.35K Points
Coach

Q. Which hook can be used to access the previous value of a prop or state?

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

A

Admin • 831.35K Points
Coach

Q. What is the default value of useState when not provided?

  • (A) undefined
  • (B) null
  • (C) 0
  • (D) Empty string

Add MCQ in this Category

If you want to share an MCQ question in this category, it's a great idea! It will be helpful for many other students using this website.

Share Your MCQ

Browse Categories

Click on category to learn MCQs of that category.