React Virtual DOM MCQ Virtual DOM Practice Questions

Direction: Choose the correct option

What is the Virtual DOM in React?

A. A separate browser feature

B. A direct copy of the real DOM

C. A lightweight JavaScript object representing the real DOM

D. A debugging tool

Direction: Choose the correct option

How does React use the Virtual DOM to improve performance?

A. It compares the Virtual DOM with the real DOM and applies minimal changes

B. It updates the real DOM directly

C. It replaces the real DOM entirely

D. It uses a different rendering engine

Direction: Choose the correct option

What is the process of comparing the Virtual DOM with the previous version called?

A. Rendering

B. Mounting

C. Reconciliation

D. Compilation

Direction: Choose the correct option

In a class component, which method triggers a re-render and updates the Virtual DOM?

A. setState()

B. constructor()

C. componentDidMount()

D. render()

Direction: Choose the correct option

Which statement about the Virtual DOM is correct?

A. It is a separate DOM implemented by browsers

B. It always makes React faster

C. It minimizes direct manipulation of the real DOM

D. It cannot be used with functional components

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