React JS Quiz

What is React.js?

• A) A back-end framework

• B) A front-end JavaScript library

• C) A database management system

• D) A CSS preprocessor

Which company developed React.js?

• A) Google

• B) Microsoft

• C) Facebook

• D) Twitter

What is JSX?

• A) A JavaScript extension syntax for writing HTML in JavaScript

• B) A new version of JavaScript

• C) A CSS framework

• D) A database language

Which of the following is used to create a functional component in React?

• A) class MyComponent extends React.Component

• B) function MyComponent() { return <div>Hello</div>; }

• C) React.createComponent(MyComponent)

• D) new React.Component(MyComponent)

Which method is used to update the state in a React class component?

• A) updateState()

• B) setState()

• C) changeState()

• D) modifyState()

Which of the following is a correct way to pass a prop to a component?

• A) <MyComponent prop="value" />

• B) <MyComponent {prop: "value"} />

• C) <MyComponent.prop = "value" />

• D) <MyComponent prop["value"] />

Which Hook is used to manage state in a functional component?

• A) useEffect

• B) useState

• C) useReducer

• D) useContext

What is the correct way to update a state variable in React?

• A) state = newValue;

• B) setState(newValue);

• C) this.state = newValue;

• D) modifyState(newValue);

How do you handle events in React?

• A) Using addEventListener

• B) By adding an event handler as a prop

• C) By using bindEvent()

• D) By calling eventHandle()

Which event handler is used for form submission in React?

• A) onChange

• B) onClick

• C) onSubmit

• D) onPress