React useEffect Dependency MCQ useEffect Dependency Practice Questions

Direction: Choose the correct option

What does the dependency array in useEffect control?

A. The cleanup timing

B. The return value of useEffect

C. The order of effects

D. When the effect should re-run

Direction: Choose the correct option

If you omit the dependency array, how often does the effect run?

A. Never

B. After every render

C. Only when a specific prop changes

D. Only once

Direction: Choose the correct option

What happens if you pass an empty array []?

A. The effect runs only when state changes

B. The effect never runs

C. The effect runs only on mount and unmount

D. The effect runs after every render

Direction: Choose the correct option

Which values should be included in the dependency array?

A. Only functions

B. All props and state used inside the effect

C. Only primitive values

D. Only objects

Direction: Choose the correct option

What is a common mistake when using dependencies?

A. Including too many values

B. Not using an array

C. Using an empty array

D. Missing dependencies, causing stale closures

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