React Components MCQ Components Practice Questions

Direction: Choose the correct option

What are React components?

A. Functions that return HTML strings

B. Third-party libraries

C. Reusable pieces of UI that return React elements

D. Classes that directly manipulate the DOM

Direction: Choose the correct option

Which of the following is a valid way to define a React component?

A. All of the above

B. class MyComponent extends React.Component { render() { return <div>Hi</div>; } }

C. function MyComponent() { return <div>Hi</div>; }

D. const MyComponent = () => { return <div>Hi</div>; }

Direction: Choose the correct option

What must every React component return?

A. A string

C. A single root React element

D. An array of elements

Direction: Choose the correct option

What is the difference between a React element and a React component?

A. A component is a function/class; an element is the object returned from it

B. An element is a component instance

C. They are the same

D. Components are written in JSX, elements in HTML

Direction: Choose the correct option

Which lifecycle method is mandatory in a class component?

A. render()

B. componentDidMount()

C. constructor()

D. componentWillUnmount()

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