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1.What is React JS?
A) Database
B) JavaScript Library
C) Operating System
D) Programming Language
Answer: B) JavaScript Library
2. Who developed React?
A) Google
B) Facebook
C) Microsoft
D) Apple
Answer: B) Facebook
3. What does JSX stand for?
A) JavaScript XML
B) Java Syntax Extension
C) Java XML System
D) JSON XML
Answer: A) JavaScript XML
4. Which DOM does React use?
A) Real DOM
B) Virtual DOM
C) Shadow DOM
D) Browser DOM
Answer: B) Virtual DOM
5. React components are mainly ______.
A) Reusable
B) Temporary
C) Static
D) Fixed
Answer: A) Reusable
6. Data flow in React is?
A) Bidirectional
B) Unidirectional
C) Multidirectional
D) Random
Answer: B) Unidirectional
7. Which hook is used to manage state?
A) useEffect
B) useState
C) useRef
D) useMemo
Answer: B) useState
8. Props in React are?
A) Mutable
B) Immutable
C) Editable
D) Changeable
Answer: B) Immutable
9. Which hook is used for side effects?
A) useState
B) useEffect
C) useReducer
D) useProps
Answer: B) useEffect
10. What is used to uniquely identify list items?
A) id
B) key
C) index
D) value
Answer: B) key
11. Which library is used for routing in React?
A) ReactPath
B) ReactRouter
C) RouterJS
D) RouteDOM
Answer: B) ReactRouter
12. What is create-react-app?
A) Framework
B) CLI Tool
C) Library
D) Plugin
Answer: B) CLI Tool
13. Which hook accesses DOM elements?
A) useDOM
B) useRef
C) useState
D) useEffect
Answer: B) useRef
14. Which is a state management library?
A) Axios
B) Redux
C) Babel
D) Webpack
Answer: B) Redux
15. React is mainly used to build?
A) Backend
B) User Interface
C) Database
D) Network
Answer: B) User Interface
16. Which method renders React to DOM?
A) React.render()
B) ReactDOM.render()
C) renderApp()
D) startReact()
Answer: B) ReactDOM.render()
17. What is Babel used for?
A) Testing
B) Compile JSX
C) Routing
D) Styling
Answer: B) Compile JSX
18. Fragment is used to?
A) Add extra DOM
B) Avoid extra DOM
C) Style DOM
D) Delete DOM
Answer: B) Avoid extra DOM
19. Which is NOT a React hook?
A) useState
B) useClass
C) useEffect
D) useRef
Answer: B) useClass
20. React supports ______ rendering.
A) Only client
B) Only server
C) Both
D) None
Answer: C) Both
21. State in React is?
A) Immutable
B) Mutable
C) Fixed
D) Constant
Answer: B) Mutable
22. Parent to child communication uses?
A) Redux
B) Props
C) Context
D) Event
Answer: B) Props
23. Which is used for performance optimization?
A) useMemo
B) useState
C) useEffect
D) useProps
Answer: A) useMemo
24. React testing library?
A) Jest
B) Mocha
C) Selenium
D) PHPUnit
Answer: A) Jest
25. React is based on ______ architecture.
A) MVC
B) Component
C) Layered
D) Monolithic
Answer: B) Component
