React JS MCQ For Freshers & Experienced

  • Question 1) What kind of component import React from 'react' is?
  • Question 2) What is ReactJS?
  • Question 3) Which of following is used to pass data to a component from outside?
  • Question 4) What function allows you to render React content in an HTML page?
  • Question 5) React.js was created by
  • Question 6) Arbitrary inputs of components in React are called
  • Question 7) What is state in React?
  • Question 8) For what "webpack" command is used?
  • Question 9) What create-react-app command do
  • Question 10) How many elements does a react component return?
  • Question 11) in which directory react components are saved?
  • Question 12) Everything in react is a ....................
  • Question 13) Props are __________ into other components.
  • Sharad Jaiswal
  • 24th Aug, 2020
  • 675 Followers

We have listed here Best React JS MCQ Questions for your basic knowledge of React JS. This React JS MCQ Test contains 25 multiple Choice Questions with 4 options. You have to select the right answer to every question.

React JS MCQ
Updated ON

24th Aug, 2020

No. of Questions

25

Posted In

MCQ

Author

Sharad Jaiswal

  1. React JS MCQ

React JS MCQ Questions

Q1. What kind of component import React from 'react' is?

  • stateless component
  • statefull component
  • pure component
View Answer
import React from 'react' is a stateless component.

Q2. What is ReactJS?

  • User-interface framework
  • Server-side Framework
  • Both server & Client
View Answer
ReactJS is User-interface framework.

Q3. Which of following is used to pass data to a component from outside?

  • PropTypes
  • setState
  • render with arguments
  • props
View Answer
Props are used to pass data to a component from outside

Q4. What function allows you to render React content in an HTML page?

  • React.mount()
  • ReactDOM.start()
  • ReactDOM.render()
  • React.render()
View Answer
ReactDOM.render() function allows you to render React content in an HTML page

Q5. React.js was created by

  • Jordan Walke
  • Jordan mike
  • Tim Lee
  • Jordan Lee
View Answer
React.js was created by Jordan Walke

Q6. Arbitrary inputs of components in React are called

  • Keys
  • Props
  • Elements
  • Ref
View Answer
Arbitrary inputs of components in React are called props.

Q7. What is state in React?

  • A persistant storage.
  • An internal data store (object) of a component.
View Answer
State in React is an internal data store (object) of a component.

Q8. For what "webpack" command is used?

  • Transpiles all the Javascript down into one file
  • Runs react local development server.
  • A module bundler
View Answer
Webpack is a module bundler

Q9. What create-react-app command do

  • Update a react app
  • Creates new react app
  • install dependencies
View Answer
create-react-app command is used to create a new react app

Q10. How many elements does a react component return?

  • 1
  • 2
  • Multiple Elements
View Answer
A react component can return Multiple Elements

Q11. in which directory react components are saved?

  • Inside vendor/
  • Inside js/components/
  • Inside vendor/components/
  • Inside external/components/
View Answer
Inside js/components/

Q12. Everything in react is a ....................

  • Class
  • Module
  • Package
  • Component
View Answer
Component

Q13. Props are __________ into other components.

  • Injected
  • Methods
View Answer
Methods

Q14. React.js Covers only the view layer of the app.

  • True
  • False

Q15. How can you access the state of a component from inside of a member function?

  • this.state
  • this.values
  • this.getState()
  • this.prototype.stateValue
View Answer
this.values

Q16. Which of the following is the correct data flow sequence of flux concept?

  • Action->Dispatcher->View->Store
  • Action->Dispatcher->Store->View
  • Action->Store->Dispatcher->View
  • None of the above
View Answer
Action->Dispatcher->Store->View

Q17. How many elements does a react component return?

  • 1 Element
  • 2 Elements
  • Multiple Elements
  • None of the above
View Answer
Multiple Elements

Q18. ReactJS uses _____ to increase performance.

  • Original DOM
  • Virtual DOM
  • Both Original & Virtual DOM
  • None of the above
View Answer
Virtual DOM

Q19. For controlled components in react

  • Source of truth is DOM
  • Source of truth can be anything
  • Source of truth is component state
  • None of the above
View Answer
Source of truth is component state

Q20. What are the two ways that data gets handled in React?

  • state & props
  • services & components
  • None of the above
View Answer
state & props

Q21. Which of the following option is used to access the state of a component from inside of a member function?

  • this.state
  • this.values
  • this.getState()
  • this.prototype.stateValue
View Answer
this.values

Q22. At the highest level, React components have lifecycle events that fall into

  • Destruction
  • Initialization
  • State/Property Updates
  • All of these
View Answer
All of these

Q23. React is mainly for building ...........

  • Database
  • Connectivity
  • Design platform
  • User interface
View Answer
User interface

Q24. React supports all the syntax of ........

  • ES6
  • Redux
  • Native Java
  • None of the above

Q25. Which of the following concepts is/are key to ReactJS?

  • Event delegation model
  • Component-oriented design
  • Both of the above
  • None of the above
View Answer
Both of the above

About Author :

  • Author of React JS MCQ

    Sharad Jaiswal

    Sharad Jaiswal is Sr. Web Developer from Noida area. He have rich experience in PHP, Angular Js, React, javascript and Node .If you any query or project on these programming you can drop your enquiry in comment section.

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