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React Js MCQ Online Test

  1. React.js is a free and open-source front-end .................
  2. React.js was Initially released in ................
  3. React.js has Written in ................
  4. ............. is used in React.js to increase performance?
  5. What is Babel?
  6. Which of the following command is used to create a react app?
  7. .............. port is the default where the webpack-dev-server will run.
  8. A valid react component can return only ......... element.
  9. A state in React.js is also known is ..............
  10. In React js what is used to pass data to a component from outside?
  11. How can you access the state of a component from inside of a member function?
  12. Props are __________ into other components.
  13. What is a react.js in MVC?
  14. Keys are given to a list of elements in react. These keys should be -
Last Updated: Mar 17, 2023,
Posted in Interview Questions,
30 Questions
React JS MCQ

React JS is the latest and most popular JavaScript framework. This React Js MCQ Test contains 30+ React Js Multiple Choice Questions. So, you have to select the right answer to check your final preparation for your Exams & Interviews. Besides this, you can also download the PDF Completely Free.

  • JavaScript library
  • Bootstrap library
  • CSS library
  • None of the Above
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  • May 29, 2013
  • April 29, 2013
  • June 29, 2013
  • May 29, 2014
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  • JavaScript
  • Python
  • Java
  • Php
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  • Virtual DOM
  • Original DOM
  • Both Original & Virtual DOM
  • None of the Above
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  • A JavaScript transpiler
  • A JavaScript interpreter
  • A JavaScript Compiler
  • None of the above
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  • install -g create-react-app
  • npm install create-react-app
  • npx create-react-app reactapp
  • None of the Above
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  • 3030
  • 8080
  • 3306
  • 3000
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  • 2
  • 3
  • 1
  • 4
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  • A permanent storage.
  • An Internal storage of the component.
  • An External storage of the component.
  • All of the above
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  • setState
  • render with arguments
  • props
  • PropTypes
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  • this.getState()
  • this.values
  • this.prototype.stateValue
  • this.state
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  • Methods
  • Injected
  • Both 1 & 2
  • All of the above
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  • Middleware
  • Controller
  • Model
  • View
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  • Do not requires to be unique
  • Unique in the DOM
  • Unique among the siblings only
  • All of the above
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  • Dispatcher->Action->Store->View
  • Action->Dispatcher->View->Store
  • Action->Dispatcher->Store->View
  • Action->Store->Dispatcher->View
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  • Yes
  • No
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  • Jordan Walke
  • Rasmus Lerdorf
  • Miško Hevery
  • None of the above
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  • JSX
  • Flux
  • Dom
  • Props
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  • True
  • False
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  • Ref
  • Keys
  • Props
  • Elements
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  • revokeDefault()
  • preventDefault()
  • avoidDefault()
  • None of the Above
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  • Database
  • User interface
  • Connectivity
  • Design platform
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  • props
  • elements
  • components
  • None of the Above
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  • this.State{}
  • this.setState
  • this.setChangeState
  • None of the Above
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  • client-side framework
  • server-side framework
  • ui (user interface) framework
  • None of the above
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  • this
  • Create
  • Extends
  • Inherits
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  • state & services
  • state & component
  • State & props
  • services & component
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  • self()
  • this()
  • Inherits()
  • super()
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  • js/components
  • components/js
  • vendor/components
  • None of the above
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  • complete the update
  • optimize for all devices
  • change the layout of the screen
  • when we need the browser to paint before effectors
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