Quiz for Redux Basics

Q1: What is Redux?

A. A state management library B. A UI library C. A styling tool D. A router

Q2: Which principle is core to Redux?

A. Single source of truth B. Multiple state stores C. Direct DOM manipulation D. Automatic styling

Q3: What is an action in Redux?

A. A plain object describing state change B. A function to update UI C. A CSS rule D. A component

Q4: What is a reducer?

A. A function that returns new state based on action B. A UI component C. A type of middleware D. A store

Q5: What does the store in Redux do?

A. Holds the application state B. Renders UI C. Handles routing D. Manages CSS

Q6: How do you dispatch an action?

A. Using store.dispatch(action) B. By calling a reducer C. By updating state directly D. By changing props

Q7: What must an action object contain?

A. A type property B. A state property C. A payload property D. A reducer property

Q8: What is middleware in Redux?

A. Code between dispatch and reducer B. State updater C. UI renderer D. Routing handler

Q9: Which is a popular middleware for async in Redux?

A. Redux Thunk B. Redux Saga C. Redux Logger D. Redux DevTools

Q10: How do you access Redux state in a React component?

A. Using useSelector hook B. Using useState hook C. Using props D. Using useEffect hook

Q11: What is the purpose of connect() function?

A. To connect React to Redux store B. To dispatch actions C. To create reducers D. To render UI

Q12: What is the difference between useSelector and connect?

A. useSelector is hook based, connect is HOC B. No difference C. connect is faster D. useSelector is deprecated

Q13: What does combineReducers do?

A. Combines multiple reducers into one B. Merges state C. Dispatches multiple actions D. Creates middleware

Q14: What is the typical flow in Redux?

A. Dispatch action → reducer → new state B. New state → action → dispatch C. Reducer → dispatch → action D. UI → new state → reducer

Q15: Is Redux suitable for small apps?

A. Sometimes, but often overkill B. Always C. Never D. Only with React Native

Q16: What is a selector?

A. Function to select part of state B. Action creator C. Middleware D. Reducer

Q17: Can Redux work with frameworks other than React?

A. Yes, it is framework agnostic B. No, only React C. Only Angular D. Only Vue

Q18: What tool helps debug Redux state?

A. Redux DevTools B. React DevTools C. Chrome DevTools D. VSCode Debugger

Q19: What does "immutable state" mean in Redux?

A. State cannot be mutated directly B. State is mutable C. State changes randomly D. State is only for UI

Q20: How are state updates handled in Redux?

A. By returning new state objects from reducers B. By modifying state directly C. By calling setState D. By dispatching UI events