Quiz for Lifting State Up

Q1: What is "lifting state up" in React?

A. Moving state from parent to child B. Moving state from child to parent C. Deleting state D. Creating new state

Q2: Why do we lift state up in React?

A. To avoid prop drilling B. To reduce re-renders C. To share data between components D. To increase performance

Q3: Where should the shared state reside when two sibling components need to communicate?

A. In one of the siblings B. In the child component C. In the common parent D. In App component only

Q4: Which method is commonly used to lift state up?

A. Passing refs B. Passing callback functions C. Using Redux D. Using Context API

Q5: What is passed from parent to child to allow lifting state up?

A. State B. Context C. Callback function D. useEffect

Q6: What happens when state is lifted up?

A. Only the parent re-renders B. Only children re-render C. Both parent and children re-render D. No component re-renders

Q7: Which React hook is typically used in parent when lifting state?

A. useEffect B. useRef C. useState D. useMemo

Q8: How do children affect parent state when lifted?

A. By using state directly B. By using props C. By calling callback props D. By accessing context

Q9: What is a downside of lifting state up?

A. It causes memory leaks B. It breaks components C. It can lead to prop drilling D. It disables re-rendering

Q10: Which is true about lifting state?

A. Only works in class components B. Avoided in functional components C. Still valid with hooks D. Deprecated in latest React

Q11: Is lifting state up related to component hierarchy?

A. No B. Yes, only if deeply nested C. Yes, based on common ancestor D. Only in HOC components

Q12: What kind of function is passed to child for lifting state?

A. State hook B. Pure function C. State updating function D. Static function

Q13: Can multiple children share a lifted state?

A. No B. Yes, through context only C. Yes, if managed in parent D. Only with Redux

Q14: When should state be lifted up?

A. When only one component uses it B. To increase code duplication C. To share between siblings D. To reduce abstraction

Q15: Which approach is better for deeply nested state sharing?

A. Lifting state up B. Passing through props C. Context API D. Using refs

Q16: Does lifting state up increase coupling?

A. No B. Yes C. Only in Redux D. Depends on props

Q17: What causes child to update when lifting state?

A. Changing internal state B. Receiving new props from parent C. Calling useRef D. Uncontrolled input

Q18: Which is an alternative to lifting state up?

A. Higher Order Component B. Class Components C. React Context D. Destructuring props

Q19: Lifting state helps in achieving what React principle?

A. One-way data flow B. Two-way data binding C. Virtual DOM D. Lazy loading

Q20: What’s a sign that you may need to lift state up?

A. Both parent and child use same logic B. Child uses independent data C. Sibling components share common data D. Component does not re-render