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17th
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REACT JS MCQ
* Admin
* 17th Mar, 2023
* 846 Followers
* React Js MCQ Questions
* React JS MCQ Pdf
REACT JS MCQ QUESTIONS
* 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 -
* 15. Which of the following is the correct data flow sequence of flux concept?
* 16. React.js covers only the view layer of the app.
* 17. React was originally developed by ...............
* 18. .............. helps react for keeping their data unidirectional.
* 19. React merges the object you provide into the current state using
setState().
* 20. Arbitrary inputs of components are called ...........
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.
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REACT JS MCQ ONLINE TEST
1) REACT.JS IS A FREE AND OPEN-SOURCE FRONT-END .................
* A. JavaScript library
* B.Bootstrap library
* C.CSS library
* D.None of the Above
2) REACT.JS WAS INITIALLY RELEASED IN ................
* A. May 29, 2013
* B.April 29, 2013
* C.June 29, 2013
* D.May 29, 2014
3) REACT.JS HAS WRITTEN IN ................
* A. JavaScript
* B.Python
* C.Java
* D.Php
4) ............. IS USED IN REACT.JS TO INCREASE PERFORMANCE?
* A. Virtual DOM
* B.Original DOM
* C.Both Original & Virtual DOM
* D.None of the Above
5) WHAT IS BABEL?
* A. A JavaScript transpiler
* B.A JavaScript interpreter
* C.A JavaScript Compiler
* D.None of the above
Download Free : React JS MCQ PDF
6) WHICH OF THE FOLLOWING COMMAND IS USED TO CREATE A REACT APP?
* A. install -g create-react-app
* B.npm install create-react-app
* C.npx create-react-app reactapp
* D.None of the Above
7) .............. PORT IS THE DEFAULT WHERE THE WEBPACK-DEV-SERVER WILL RUN.
* A. 3030
* B.8080
* C.3306
* D.3000
8) A VALID REACT COMPONENT CAN RETURN ONLY ......... ELEMENT.
* A. 2
* B.3
* C.1
* D.4
9) A STATE IN REACT.JS IS ALSO KNOWN IS ..............
* A. A permanent storage.
* B.An Internal storage of the component.
* C.An External storage of the component.
* D.All of the above
10) IN REACT JS WHAT IS USED TO PASS DATA TO A COMPONENT FROM OUTSIDE?
* A. setState
* B.render with arguments
* C.props
* D.PropTypes
Read Best: React Js Interview Questions
11) HOW CAN YOU ACCESS THE STATE OF A COMPONENT FROM INSIDE OF A MEMBER
FUNCTION?
* A. this.getState()
* B.this.values
* C.this.prototype.stateValue
* D.this.state
12) PROPS ARE __________ INTO OTHER COMPONENTS.
* A. Methods
* B.Injected
* C.Both 1 & 2
* D.All of the above
13) WHAT IS A REACT.JS IN MVC?
* A. Middleware
* B.Controller
* C.Model
* D.View
14) KEYS ARE GIVEN TO A LIST OF ELEMENTS IN REACT. THESE KEYS SHOULD BE -
* A. Do not requires to be unique
* B.Unique in the DOM
* C.Unique among the siblings only
* D.All of the above
15) WHICH OF THE FOLLOWING IS THE CORRECT DATA FLOW SEQUENCE OF FLUX CONCEPT?
* A. Dispatcher->Action->Store->View
* B.Action->Dispatcher->View->Store
* C.Action->Dispatcher->Store->View
* D.Action->Store->Dispatcher->View
Download Free: React Js Interview Questions PDF
16) REACT.JS COVERS ONLY THE VIEW LAYER OF THE APP.
* A. Yes
* B.No
17) REACT WAS ORIGINALLY DEVELOPED BY ...............
* A. Jordan Walke
* B.Rasmus Lerdorf
* C.Miško Hevery
* D.None of the above
18) .............. HELPS REACT FOR KEEPING THEIR DATA UNIDIRECTIONAL.
* A. JSX
* B.Flux
* C.Dom
* D.Props
19) REACT MERGES THE OBJECT YOU PROVIDE INTO THE CURRENT STATE USING SETSTATE().
* A. True
* B.False
20) ARBITRARY INPUTS OF COMPONENTS ARE CALLED ...........
* A. Ref
* B.Keys
* C.Props
* D.Elements
21) WE CAN PREVENT DEFAULT BEHAVIOR IN REACT USING ............
* A. revokeDefault()
* B.preventDefault()
* C.avoidDefault()
* D.None of the Above
22) REACT IS MAINLY USED FOR BUILDING ................
* A. Database
* B.User interface
* C.Connectivity
* D.Design platform
23) WHAT IS THE SMALLEST BUILDING BLOCK OF REACTJS?
* A. props
* B.elements
* C.components
* D.None of the Above
24) WHICH FUNCTION IS USED TO CHANGE THE STATE OF REACT COMPONENT?
* A. this.State{}
* B.this.setState
* C.this.setChangeState
* D.None of the Above
25) WHAT IS REACT JS?
* A. client-side framework
* B.server-side framework
* C.ui (user interface) framework
* D.None of the above
26) WHICH OF THE FOLLOWING IS USED TO CREATE A CLASS INHERITANCE?
* A. this
* B.Create
* C.Extends
* D.Inherits
27) WHAT ARE THE WAYS TO HANDLE DATA IN REACT.JS?
* A. state & services
* B.state & component
* C.State & props
* D.services & component
28) WHICH OF THE FOLLOWING METHOD IS USED FOR THE PARENT CLASS IN REACT.JS?
* A. self()
* B.this()
* C.Inherits()
* D.super()
29) REACT COMPONENTS ARE SAVED IN ....................... DIRECTORY.
* A. js/components
* B.components/js
* C.vendor/components
* D.None of the above
30) USELAYOUTEFFECT FUNCTION IS USED TO .................
* A. complete the update
* B.optimize for all devices
* C.change the layout of the screen
* D.when we need the browser to paint before effectors
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