250+ React Js MCQ With Online Practice Test

React.js, often simply called React, is a highly popular JavaScript library for building user interfaces. Developed and maintained by Facebook, React is renowned for its component-based architecture and the ability to efficiently update and render components when data changes. It is a foundational tool for developing modern web and mobile applications, allowing developers to create dynamic and interactive user interfaces with ease. React's vast ecosystem, including tools like React Native for mobile app development, makes it a top choice for frontend development and a key player in the world of web technologies.

Practice Test

211. What is the purpose of a build tool like Webpack or Parcel in React application deployment?

Answer: To optimize and bundle the code

212. Which of the following is not a commonly used hosting service for deploying React applications?

Answer: ReactHub

213. What is the role of Continuous Integration/Continuous Deployment (CI/CD) tools in React application deployment?

Answer: To build, test, and deploy code automatically

214. Which command is commonly used to create a production build of a React application?

Answer: npm run build

215. What is the purpose of setting environment variables in a React application before deployment?

Answer: To hide sensitive data

216. In React, what does "pre-rendering" refer to in the context of server-side rendering (SSR)?

Answer: Rendering components only on the server

217. What is the primary advantage of deploying a React application using a Content Delivery Network (CDN)?

Answer: Faster loading times

218. What is a common method for optimizing images in a React application before deployment?

Answer: Compressing and resizing images

219. What is "code splitting" in the context of React application deployment?

Answer: Dividing the code into small, manageable parts

220. What is the purpose of a "deployment pipeline" in React application deployment?

Answer: To automate the deployment process
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React Js Multiple Choice Questions React Js MCQ React Js Interview Questions With Answers