React Js MCQ Questions And Answers

ReactJs MCQ : This section focuses on "Basics" of React Js. These Multiple Choice Questions (MCQ) should be practiced to improve the React Js skills required for various interviews (campus interviews, walk-in interviews, company interviews), placements, entrance exams and other competitive examinations.

1. Which of the following is true about React?

A. React is a JavaScript library for building user interfaces.
B. React is used to build single page applications.
C. React allows us to create reusable UI components.
D. All of the above

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2. Which command is used Install create-react-app?

A. npm install -g create-react-app
B. npm install create-react-app
C. npm install -f create-react-app
D. install -g create-react-app

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3. Initial Release to the Public (V0.3.0) was in ?

A. 2011
B. 2012
C. 2013
D. 2014

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4. A class is a type of function, but instead of using the keyword function to initiate it, we use the keyword?

A. constructor
B. class
C. object
D. dataObject

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5. To create a class inheritance, use the ________ keyword.

A. create
B. inherits
C. extends
D. this

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6. In ES6, how many ways of defining your variables?

A. 3
B. 4
C. 5
D. 6

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7. JSX allows us to write HTML elements in JavaScript and place them in the DOM without any?

A. createElement
B. appendChild
C. getElementById
D. Both A and B

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8. Does React creates a VIRTUAL DOM in memory.

A. TRUE
B. FALSE
C. Can be true or false
D. Can not say

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9. Everything in react is a?

A. Module
B. Package
C. Class
D. Component

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10. In React, component properties should be kept in an object called?

A. component
B. super
C. state
D. props

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