React MCQs – Multiple Choice Questions and Answers – Part 2
Multiple choice questions and answers (MCQs) on React to prepare for exams, tests, and certifications. These questions are taken from a real written exam and some parts are taken from an interview. So you will find questions on basic techniques such as UI, DOM, services, JSX, and more. This quiz will easily prepare anyone to pass their online test.
1. Props in React can ________
A Be modified inside the component
B Not be modified in the component
C Be modified in another component
D None of the above
In addition, the data in Props is read-only, which means that the data coming from the parent must not be modified by the child components.
2. In ReactJS, props can be used to trnasmit ________
A component properties
B component event handlers
C Both A and B are true.
D None of the above
3. What does the “webpack” command do?
A Turns all JavaScript into one file
B Runs the React local development server.
C A bundler module
D None of the above
4. Which port is the default port where the webpack-dev-server will run?
A 3000
B 8080
C 3306
D 8000
5. What are the two ways data is processed in React?
A state & props
B services & components
C state & services
D props & components
6. In React, what is used to transmit data to an outside component?
A setState
B render with arguments
C props
D PropTypes
7. What is the name of the developer of React.js?
A Jordan mike
B Jordan Walke
C Jordan Lee
D Tim Lee
8. Who is developing React.js?
A Google
B Twitter
C Apple
D Facebook
9. ______ helps react to keep their data unidirectional.
A JSX
B Flux
C Dom
D Props
10. The State object in react can be updated by calling the setState method. These calls are _________
A Synchronous by nature
B Asynchronous by nature
C Are asynchronous but can be synchronized if necessary
D None of the above
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