React JS MCQs for Aspiring Front-End Developers

Whether you’re a seasoned developer or just starting, preparing for a React JS interview can be daunting. That’s why we have curated the list of React JS interview questions to help you in your learning journey.

These interview questions are Multiple Choice Questions (MCQs) that cover a range of core concepts essential for understanding and working with React.

These interview questions include state management (eg. Internal state, setState method), props, hooks (eg. State and side effect management in functional components), higher-order components (HOCs), Redux, and more.

Additionally, the questions address understanding of controlled vs. uncontrolled components, serverless architecture benefits, and key features of React such as the virtual DOM, and declarative UI.

As an aspiring frond-end developer, you might already be leveraging online resources, coding boot camps, tutorials, and building personal projects. These MCQs can help you gauge your overall performance and identify areas needing improvement.

So, let’s just dive straight!

Also read: Advanced React JS Interview Questions

Popular React MCQs with Answers

To help you recall ReactJS basics, let’s now head towards MCQs. Explore the React interview questions and SPA framework questions for front-end development here. 

Q1. AngularJS is highly suited for

1. MPA
2. ZPA
3. SPA
4. DPA

Answer: c. SPA

Q2. What do you interpret by state in React?

1. External storage of compartment
2. Permanent storage
3. Internal storage of compartment
4. All of the above

Answer: c. Internal storage of compartment

Q3. Which of the following directory stores the React Components?

1. Inside components/js/
2. Inside vendor/components
3. Inside js/components/
4. Inside vendor/js/components/

Answer: c. Inside js/components/

Q4. Which among the following defined routes in a React application?

1. Route
2. Router
3. Routed
4. Routing

Answer: a. Route

Q5. Choose the wrong statement about redux

1. It offers state persistence
2. It easily passes between components
3. It is only used with React
4. It eases debugging and testing

Answer: a. It offers state persistence

Q6. Which is the right command for creating a new React app?

1. npx create-react-app-g my-app
2. npx create-new-react-app my-app
3. npx create-react-app my-app
4. Any of these can be used

Answer: c. npx create-react-app my-app

Q7. Select the correct use of React hooks

1. Style management in class components
2. Style management in functional components
3. State and side effect management in class components
4. State and side effect management in functional components

Answer: d. State and side effect management in functional components

Q8. Which type of updates to the component state is seen when using React?

1. Removal of complete component
2. Updation of complete component
3. Updation of a specific component
4. Addition of a new component

Answer: c. Updation of a specific component

Q9. Select the correct option depiction purpose of HOCs or Higher Order Components in React

1. Management of component events
2. Management of component styles
3. Reuse of component logic
4. Data sharing between components

Answer: c. Reuse of component logic

Q10. What are props in ReactJS?

1. They are the functions in ReactJS
2. They are the arguments passed into React components
3. They return multiple values from the function
4. All of the above

Answer: b. They are the arguments passed into React components

Q11. Which of the following allows accessing URL parameters from the React component?

1. By using the object props.route
2. By using the object props.location
3. By using the object props.match.params
4. By using the object props.params

Answer: c. By using the object props.match.params

Q12. Select the correct option describing the use of the ‘webpack’ command in ReactJS

1. It is a module bundler
2. It runes React local development server
3. It is used to transpile all JavaScript into one file
4. All of the above

Answer: a. It is a module bundler

Q13. Which option states the correct information on the ‘key’ prop

1. The ‘Key’ prop is among the HTML attributes
2. ‘Key’ prop identifies a newly added item in the list
3. The ‘Key’ prop compares the new item during the ‘diffing’ algorithm
4. Both b and c

Answer: d. Both b and c

Q14. During the ReactJS Lifecycle method, static getDerivedSateFromProps(props, state) is called in which condition

1. On updating the state of the component
2. On creating a new component
3. Both a and b
4. None of the above

Answer: c. Both a and b

Q15. Which of these functions updates the state in ReactJS?

1. Through the componentDidUpdate lifecycle method
2. Via setState() method
3. Through the componentWillUpdate life cycle method
4. Via direct modification of the state object

Answer: b. Via setState() method

Q16. What are the components of React?

1. They are a set of variables defined in ReactJS
2. They are HTML elements
3. They are independent and reusable codes that return HTML elements
4. Both a and b are correct

Answer: c. They are independent and reusable codes that return HTML elements

Q17. How do you understand prop drilling? It is:

1. Concept of passing data inside the component itself
2. Concept of passing data between sibling components
3. Concept of passing data to required destination as states until data reaches the required destination
4. Concept of passing data through intermediate components as props until data reaches the required destination

Answer: d. Concept of passing data through intermediate components as props until data reaches the required destination

Q18. What is the benefit of serverless integration on React applications?

1. It adds authentication functionality
2. It speeds up component rendering
3. It optimized code splitting
4. It allows scalability and cost-effective hosting

Answer: d. It allows scalability and cost-effective hosting

Q19. How will you manage scaling up of the resources in serverless architecture

1. Via physical hardware
2. Via load balancers
3. Automatically through the cloud provider
4. Manually by developer

Answer: c. Automatically through the cloud provider

Q20. Which of these features can be enlisted as features of ReactJS?

1. JSX to ease writing React components
2. Declarative UI for efficient readability and debugging
3. Flexibility and speed
4. Virtual DOM
5. All of the above

Answer: e. All of the above

Q21. Which of these parameters differentiates controlled and uncontrolled components?

1. Predictability
2. Component and quantity of control over the data
3. Form of storage of values
4. All of the above

Answer: d. All of the above

Q22. What is the role of JSX in React?

1. Eases working with props and state
2. Efficiently handles browser events
3. Offers the method to write HTML elements in JavaScript
4. Improves performance of the Virtual DOM

Answer: c. Offers the method to write HTML elements in JavaScript

Q23. Which functions change the state of the ReactJS component?

1. this.State{}
2. this.setState
3. this.setChangeState
4. this.ChangeState

Answer: b. this.setState

Q24. Which of these can handle data in React?

1. State and component
2. Service and component
3. State and service
4. State and props

Answer: d. State and props

Q25. Which of the functions is not available in ReactDOM?

1. ReactDOM.findDOMNode()
2. ReactDOM.hydrate()
3. ReactDOM.destroy()
4. ReactDOM.create Portal()

Answer: c. ReactDOM.destroy()

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FAQs: React JS MCQs

Why is React good for the front end? 
Yes, easy maintenance and flexibility make it good for the front end.

Is React better than HTML?
React is preferred for dynamic and complex applications, while HTML is suited for static and simple websites.

Should I use NodeJS with React? 
Yes, it is a widely recommended combination for creating modern web applications.

Should I learn React without JavaScript?
No. Familiarity with JavaScript is critical to learning React.

What is the difference between React and ReactJS? 
React or React Native is an open-source JavaScript framework used to develop mobile applications. ReactJS is open-source JavaScript that builds user interfaces for web applications.

What is TypeScript vs React? 
TypeScript is a superset of JavaScript that allows developers to type annotations. React is the user interface library written in JavaScript.

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