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State & Hooks interview questions

15 real State & Hooks questions from the React Native bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.

1. What is useState?

Junior
  1. A.the hook that adds a piece of local mutable value to a function component and returns its current value plus a setter
  2. B.the hook that runs side effects after render, controlled by a dependency array and optionally returning a cleanup function
  3. C.the read-only inputs passed from a parent down to a child component to configure its appearance and behavior
  4. D.the hook that memoizes a function identity across renders so it is not recreated, helping prevent needless child updates
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3. Which statement is correct?

Junior
  1. A.useState — the hook that adds a piece of local mutable value to a function component and returns its current value plus a setter
  2. B.useState — the read-only inputs passed from a parent down to a child component to configure its appearance and behavior
  3. C.useState — the hook that reads a shared value from a provider higher in the tree without threading it through every intermediate component
  4. D.useState — the hook that runs side effects after render, controlled by a dependency array and optionally returning a cleanup function
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4. What is useEffect?

Mid
  1. A.the read-only inputs passed from a parent down to a child component to configure its appearance and behavior
  2. B.the hook that memoizes a function identity across renders so it is not recreated, helping prevent needless child updates
  3. C.the hook that reads a shared value from a provider higher in the tree without threading it through every intermediate component
  4. D.the hook that runs side effects after render, controlled by a dependency array and optionally returning a cleanup function
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6. Which statement is correct?

Mid
  1. A.useEffect — the hook that reads a shared value from a provider higher in the tree without threading it through every intermediate component
  2. B.useEffect — the hook that adds a piece of local mutable value to a function component and returns its current value plus a setter
  3. C.useEffect — the hook that runs side effects after render, controlled by a dependency array and optionally returning a cleanup function
  4. D.useEffect — the hook that memoizes a function identity across renders so it is not recreated, helping prevent needless child updates
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7. What is props?

Junior
  1. A.the hook that memoizes a function identity across renders so it is not recreated, helping prevent needless child updates
  2. B.the read-only inputs passed from a parent down to a child component to configure its appearance and behavior
  3. C.the hook that runs side effects after render, controlled by a dependency array and optionally returning a cleanup function
  4. D.the hook that reads a shared value from a provider higher in the tree without threading it through every intermediate component
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9. Which statement is correct?

Junior
  1. A.props — the hook that memoizes a function identity across renders so it is not recreated, helping prevent needless child updates
  2. B.props — the read-only inputs passed from a parent down to a child component to configure its appearance and behavior
  3. C.props — the hook that runs side effects after render, controlled by a dependency array and optionally returning a cleanup function
  4. D.props — the hook that adds a piece of local mutable value to a function component and returns its current value plus a setter
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10. What is useContext?

Mid
  1. A.the hook that runs side effects after render, controlled by a dependency array and optionally returning a cleanup function
  2. B.the read-only inputs passed from a parent down to a child component to configure its appearance and behavior
  3. C.the hook that adds a piece of local mutable value to a function component and returns its current value plus a setter
  4. D.the hook that reads a shared value from a provider higher in the tree without threading it through every intermediate component
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12. Which statement is correct?

Mid
  1. A.useContext — the hook that adds a piece of local mutable value to a function component and returns its current value plus a setter
  2. B.useContext — the hook that reads a shared value from a provider higher in the tree without threading it through every intermediate component
  3. C.useContext — the hook that memoizes a function identity across renders so it is not recreated, helping prevent needless child updates
  4. D.useContext — the hook that runs side effects after render, controlled by a dependency array and optionally returning a cleanup function
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13. What is useCallback?

Senior
  1. A.the hook that runs side effects after render, controlled by a dependency array and optionally returning a cleanup function
  2. B.the hook that memoizes a function identity across renders so it is not recreated, helping prevent needless child updates
  3. C.the read-only inputs passed from a parent down to a child component to configure its appearance and behavior
  4. D.the hook that reads a shared value from a provider higher in the tree without threading it through every intermediate component
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15. Which statement is correct?

Senior
  1. A.useCallback — the hook that adds a piece of local mutable value to a function component and returns its current value plus a setter
  2. B.useCallback — the hook that memoizes a function identity across renders so it is not recreated, helping prevent needless child updates
  3. C.useCallback — the hook that reads a shared value from a provider higher in the tree without threading it through every intermediate component
  4. D.useCallback — the hook that runs side effects after render, controlled by a dependency array and optionally returning a cleanup function
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