React setState Method MCQ setState Practice Questions

Direction: Choose the correct option

In a class component, which method is used to update state?

A. this.updateState()

B. this.setState()

C. this.state = {}

D. this.replaceState()

Direction: Choose the correct option

What is the behavior of setState?

A. It replaces the entire state object

B. It schedules an update and may batch multiple calls

C. It only works in constructor

D. It immediately updates the state

Direction: Choose the correct option

When you call setState with an object, what does React do?

A. Ignores it

B. Replaces the entire state

C. Throws an error

D. Merges the object with current state

Direction: Choose the correct option

Why might you pass a function to setState instead of an object?

A. To access previous state reliably when updates are batched

B. To avoid merging

C. Because objects are not allowed

D. To improve performance

Direction: Choose the correct option

After calling setState, which lifecycle method is invoked?

A. All of the above

B. shouldComponentUpdate

C. render

D. componentDidUpdate

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