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React / ReactJS is a free and open-source front-end JavaScript library for building user interfaces based on UI components. It is maintained by Meta and a community of individual developers and companies. React can be used as a base in the development of single-page or mobile applications.

ReactJS MCQs: This section contains ReactJS Multiple-Choice Questions with Answers. These ReactJS MCQs are written for beginners as well as advanced, practice these MCQs to enhance and test the knowledge of ReactJS.

 

questions

Title
React is also known as _____

React is also known as _____.

  1. ReactJS
  2. js
  3. Both A. and B.
  4. None of these
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React is a ____

React is a ____.

  1. Web development Framework
  2. JavaScript Library
  3. jQuery
  4. Web Server
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Which ReactJS function renders HTML to the web page?

Which ReactJS function renders HTML to the web page?

  1. render()
  2. ReactDOM.render()
  3. renders()
  4. ReactDOM.renders()
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JSX stands for _____

JSX stands for _____.

  1. JSON
  2. JSON XML
  3. JavaScript XML
  4. JavaScript and AngularJS
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JSX allows us to write _____

JSX allows us to write _____.

  1. jQuery in React
  2. Angular Code in React
  3. MySQL in React
  4. HTML in React
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What is the correct syntax to write expression in JSX?

What is the correct syntax to write expression in JSX?

  1. [ expression ]
  2. { expression }
  3. {{ expression }}
  4. _expression
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A class component must include the _______ statement

A class component must include the _______ statement.

  1. extends React.Component
  2. extends React
  3. extends Component
  4. extends React.Component.All
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What are Props?

What are Props?

  1. Props are arguments passed into React components
  2. Props are functions in the ReactJS
  3. Props are used to returns multiple values from the function
  4. All of the above
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What does props stand for?

What does props stand for?

  1. Proper Arguments
  2. Properties
  3. Proper Return Values
  4. All of the above
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Which ReactJS command is used to create a new application?

Which ReactJS command is used to create a new application?

  1. create-react-app
  2. new-react-app
  3. create-new-reactapp
  4. react-app
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Which ReactJS command is used to set up everything you need to run a React Application?

Which ReactJS command is used to set up everything you need to run a React Application?

  1. create-react-app
  2. new-react-app
  3. create-new-reactapp
  4. react-app
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How to install create-react-app?

How to install create-react-app?

  1. npx create-react-app -new my-app
  2. npx create-react-app -app my-app
  3. npx new-react-app my-app
  4. npx create-react-app my-app
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ES6 stands for ____

ES6 stands for ____.

  1. ECMAScript 6
  2. Extended-JavaScript Version 6
  3. Extensive-JavaScript 6
  4. Expanded-JavaScript 6
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ECMAScript was created to standardize _____

ECMAScript was created to standardize _____.

  1. TypeScript
  2. Java
  3. JSON
  4. JavaScript
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In ES6 – A class is a type of ____

In ES6 – A class is a type of ____.

  1. Basic datatype
  2. Derived datatype
  3. Variable
  4. Function
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In ES6 – Which keyword is used to initiate a class?

In ES6 – Which keyword is used to initiate a class?

  1. function
  2. class
  3. ReactClass
  4. ReactClassJs
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In ES6 – The class properties are assigned inside a _____ method

In ES6 – The class properties are assigned inside a _____ method.

  1. props()
  2. properties()
  3. constructor()
  4. react-properties()
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In ES6 – Which keyword is used for class inheritance?

In ES6 – Which keyword is used for class inheritance?

  1. extends
  2. extend
  3. inheritance
  4. inheritances
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In ES6 – What is the correct syntax of class inheritance?

In ES6 – What is the correct syntax of class inheritance?

  1. class class1 extends class2{...}
  2. class class1 extends | class2{...}
  3. class class1 | extends class2{...}
  4. class class1 | extends | class2{...}
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In ES6 – Which method refers to the parent class?

In ES6 – Which method refers to the parent class?

  1. parent()
  2. super()
  3. top()
  4. main()
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total MCQs: 40

MCQs

40

Views

69

Best Answers

299

Points

5