Mern Full Stack Developer

Mern Full Stack Developer Interview Questions and Answers for Freshers

Updated 11 Feb 2025
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Q1. What is react What is state Useffect

Ans.

React is a JavaScript library for building user interfaces. State is a JavaScript object that stores data in a component. useEffect is a React hook for handling side effects.

  • React is a library for building UI components

  • State is a JavaScript object that stores data within a component

  • useEffect is a hook used for handling side effects in React components

Q2. What is callback functions

Ans.

Callback functions are functions passed as arguments to other functions to be executed later.

  • Callback functions are commonly used in asynchronous programming.

  • They allow for functions to be executed after another function has finished.

  • Examples include event listeners in web development.

Q3. what is EventLoop?

Ans.

EventLoop is a mechanism in JavaScript that allows for asynchronous operations to be executed in a non-blocking manner.

  • EventLoop is responsible for handling asynchronous operations in JavaScript.

  • It continuously checks the call stack and the task queue, moving tasks from the queue to the stack when the stack is empty.

  • EventLoop ensures that JavaScript remains single-threaded and non-blocking, allowing for efficient handling of asynchronous tasks.

Q4. make ui clone of given website

Ans.

Create a UI clone of a given website for a Mern Full Stack Developer position.

  • Study the layout, design, and functionality of the given website thoroughly.

  • Use HTML, CSS, and JavaScript to replicate the UI elements and features.

  • Ensure responsiveness and compatibility with different devices and browsers.

  • Consider using frameworks like React for efficient development.

  • Test the clone extensively to ensure it matches the original website.

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Q5. Whats components

Ans.

Components are reusable and independent units of code that encapsulate functionality and can be combined to build larger applications.

  • Components are the building blocks of a software application.

  • They are reusable and can be used multiple times in different parts of the application.

  • Components can have their own state and can communicate with other components through props.

  • Examples of components include buttons, forms, navigation bars, and cards.

Q6. Oops concept in java

Ans.

Oops concept in Java refers to Object-Oriented Programming principles like Inheritance, Encapsulation, Polymorphism, and Abstraction.

  • Inheritance allows a class to inherit properties and behavior from another class.

  • Encapsulation involves bundling data and methods that operate on the data into a single unit.

  • Polymorphism allows objects to be treated as instances of their parent class.

  • Abstraction hides the implementation details and only shows the necessary features to the outsid...read more

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