Full-Stack Development Full-Stack Development Frontend Frameworks & UI Architecture

Question 1

Which React hook is used to perform side effects such as data fetching or subscriptions in a functional component?

Accepted Answer

useEffect

Answer

useState

Answer

useContext

Answer

useReducer

Question 2

In Vue 3, which Composition API function creates a reactive reference to a primitive value?

Accepted Answer

ref()

Answer

reactive()

Answer

computed()

Answer

watch()

Question 3

What does the Angular CLI command `ng generate component header` do?

Accepted Answer

Creates a new component with its template, styles, spec, and module declaration

Answer

Installs the Angular header package

Answer

Generates a routing module for the header

Answer

Compiles the header component for production

Question 4

Which tool is most commonly used to bundle JavaScript modules in modern React applications?

Accepted Answer

Webpack

Answer

Babel

Answer

ESLint

Answer

Prettier

Question 5

What is the Virtual DOM in React?

Accepted Answer

An in-memory representation of the real DOM used to batch and optimize updates

Answer

A DOM stored in a database

Answer

A virtual machine that runs the DOM

Answer

A shadow DOM implementation

Question 6

In a single-page application (SPA), what is the role of a client-side router such as React Router?

Accepted Answer

It intercepts URL changes and renders the appropriate component without a full page reload

Answer

It sends requests to multiple backend servers

Answer

It caches API responses in the browser

Answer

It compiles TypeScript to JavaScript