React State Management

Question 1

What is lifting state up in React?

Accepted Answer

Moving shared state to the closest common ancestor component so multiple children can access it

Answer

Moving state to a CDN

Answer

Increasing state values

Answer

A performance optimization

Question 2

What is the Context API?

Accepted Answer

A React feature for sharing data globally across components without passing props through every level

Answer

A REST API

Answer

A third-party library

Answer

A server-side feature

Question 3

What is useReducer?

Accepted Answer

A hook for managing complex state logic with a reducer function, similar to Redux patterns

Answer

A size reducer

Answer

A file compressor

Answer

A performance tool

Question 4

What triggers a re-render in React?

Accepted Answer

State changes via setState/useState, parent re-renders passing new props, or context value changes

Answer

Every second automatically

Answer

Only manual refresh

Answer

DOM changes

Question 5

What is immutability in React state?

Accepted Answer

The practice of creating new objects/arrays instead of modifying existing ones when updating state

Answer

State that cannot exist

Answer

Read-only components

Answer

A security feature

Question 6

What is Redux?

Accepted Answer

A predictable state management library using a single store, actions, and reducers for managing application state

Answer

A React component

Answer

A CSS framework

Answer

A database