React_Quiz

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React Quiz

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Birendra Singh

India

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#	Player	Accuracy	time
1	Nivitha February 9, 2026	% 80	04:44
2	Vicky February 9, 2026	% 80	07:21
3	Sachi Kanta Sahu February 9, 2026	% 60	09:10
4	Sindhu B February 9, 2026	% 60	15:35
5	Sahith P February 8, 2026	% 53	04:46
6	Ashwini February 9, 2026	% 27	08:08

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React_QuizOnline version React Quiz by Birendra Singh 1 Which ECMAScript feature allows extracting values from objects or arrays into variables? a Spread Operator b Destructuring c Template Literals d Arrow Functions 2 What is the main advantage of React’s Virtual DOM? a Direct DOM manipulation b Faster page reload c Efficient UI updates d Reduced JavaScript code 3 Which of the following is NOT a React feature? a Component-based architecture b Two-way data binding c Virtual DOM d Unidirectional data flow 4 How do you define a class component in React? a function MyComp() b class MyComp extends Component c class MyComp extends React.Component d Both B and C 5 What will be the output of the following ECMAScript code? const user = { name: "Amit", age: 25 }; const { name } = user; console.log(name); a undefined b null c Amit d Error 6 What does the following JSX compile to? Choose one or more answers a HTML b DOM element c React.createElement() call d Browser API 7 What happens if render() does not return JSX? a App crashes b Component will not render c JSX is optional d Browser renders empty string 8 Which keyword is mandatory to access props in a class component? a this.props b props c useProps() d super.props 9 What is the output of the following code? class Test extends React.Component { render() { return {this.props.name} ; } } When rendered as: a Error b undefined c Blank screen d null 10 Which statement about state in class components is TRUE? a State can be modified directly b State is mutable c State is shared across components d State is read-only 11 What is a controlled component? a Uses ref b State handled by DOM c State handled by React d No state involved 12 Identify the component type: a Uncontrolled b Controlled c Stateless d Pure 13 Which validation approach is correct in React forms? a HTML validation only b State-based validation c Server-side validation only d Browser validation disabled 14 Which statement about CSS Modules is TRUE? a Global scope b Inline only c Locally scoped CSS d Replaces styled-components 15 Which library allows writing CSS inside JavaScript files? a CSS Modules b Styled-Components c Bootstrap d Inline CSS

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React_Quiz

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About this activity

Created by

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React_QuizOnline version

by Birendra Singh

Which ECMAScript feature allows extracting values from objects or arrays into variables?

What is the main advantage of React’s Virtual DOM?

Which of the following is NOT a React feature?

How do you define a class component in React?

What will be the output of the following ECMAScript code? const user = { name: "Amit", age: 25 }; const { name } = user; console.log(name);

What does the following JSX compile to?

Choose one or more answers

What happens if render() does not return JSX?

Which keyword is mandatory to access props in a class component?

What is the output of the following code? class Test extends React.Component { render() { return

{this.props.name}

Which statement about state in class components is TRUE?

What is a controlled component?

Identify the component type:

Which validation approach is correct in React forms?

Which statement about CSS Modules is TRUE?

Which library allows writing CSS inside JavaScript files?