React JS Multiple choice interview questions (MCQ) - Test your React JS knowledge

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Below are few React Js MCQ test that checks your basic knowledge of React JS. This React Js Test contains around 10 questions of multiple choice with 4 options. You have to select the right answer to a question. You can see the correct answer by clicking view answer link.

Also, Read Best React interview questions.

1. Everything in React is a _____________

  • Module
  • Component
  • Package
  • Class
View Answer

2. In which directory React Components are saved?

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

3. How many elements does a react component return?

  • 2 Elements
  • 1 Element
  • Multiple Elements
View Answer

4. What is state in React?

  • A persistant storage.
  • An internal data store (object) of a component.
View Answer

5. What is Babel?

  • A transpiler.
  • An interpreter
  • A Compiler
  • Both Compiler and Transpilar
View Answer

6. What does the "webpack" command do?

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

7. What port is the default where the webpack-dev-server will run?

  • 3000
  • 8080
  • 3306

8. What is ReactJS?

  • Server side Framework
  • User-interface framework
  • A Library for building interaction interfaces
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9. What are the two ways that data gets handled in React?

  • state & props
  • services & components
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10. In React what is used to pass data to a component from outside?

  • setState
  • render with arguments
  • props
  • PropTypes
View Answer

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