Frontend Frameworks & Libraries

Q1. What is React?

1. A.A CSS framework for responsive page design
2. B.A relational database management system tool
3. C.A server-side backend application framework
4. D.A JavaScript library for building user interfaces✓ Correct

Report an error in this question

Q2. What is a component in React?

1. A.A reusable piece of UI with its own logic✓ Correct
2. B.A server route for handling requests
3. C.A CSS class for styling HTML elements
4. D.A database table for storing records

Report an error in this question

Q3. What is Vue.js?

1. A.A video player for streaming content
2. B.A testing tool for browser automation
3. C.A CSS library for animation effects
4. D.A progressive framework for building UIs✓ Correct

Report an error in this question

Q4. What is Angular?

1. A.A distributed version control system tool
2. B.A CSS grid system for page layout design
3. C.A TypeScript-based web framework by Google✓ Correct
4. D.A NoSQL document-oriented database system

Report an error in this question

Q5. What is JSX?

1. A.A new standalone programming language
2. B.A CSS preprocessor like Sass or Less
3. C.A syntax extension for HTML-like code in JS✓ Correct
4. D.A JSON alternative data exchange format

Report an error in this question

Q6. What are props in React?

1. A.Database properties for configuring schemas
2. B.Browser settings for rendering preferences
3. C.Data passed from parent to child components✓ Correct
4. D.CSS properties applied to styled elements

Report an error in this question

Q7. What is state in React?

1. A.A geographical US state name string value
2. B.An object holding data that triggers re-renders✓ Correct
3. C.A CSS state like hover or focus pseudo-class
4. D.A server state for managing session data

Report an error in this question

Q8. What is npm?

1. A.A server-side programming language runtime
2. B.Node Package Manager for managing dependencies✓ Correct
3. C.A CSS framework for responsive web design
4. D.A relational database management system

Report an error in this question

Q9. What does npm install do?

1. A.Installs CSS styles into browser cache
2. B.Installs dependencies from package.json✓ Correct
3. C.Installs a new browser on the system
4. D.Installs a new operating system update

Report an error in this question

Q10. What is a Single Page Application (SPA)?

1. A.A mobile app built with native platform-specific tools
2. B.A static HTML page with no interactive features at all
3. C.A web app that loads once and dynamically updates content✓ Correct
4. D.A website containing only a single paragraph of text

Report an error in this question

Q11. What is the Virtual DOM in React?

1. A.A browser API for accessing device hardware and sensors
2. B.A lightweight copy of the real DOM for efficient updates✓ Correct
3. C.A virtual reality feature for immersive web experiences
4. D.A hidden HTML element that is invisible to the end user

Report an error in this question

Q12. What is React's useState hook?

1. A.A database hook for managing query results
2. B.A function adding state to functional components✓ Correct
3. C.A CSS hook for applying dynamic styles
4. D.A routing hook for handling URL navigation

Report an error in this question

Q13. What is the useEffect hook used for?

1. A.Creating CSS effects through JavaScript manipulation
2. B.Performing side effects like data fetching in components✓ Correct
3. C.Managing component state with reactive data binding
4. D.Adding visual effects like shadows and gradients

Report an error in this question

Q14. What is Vue's reactivity system based on?

1. A.Manual DOM manipulation with vanilla JavaScript
2. B.JavaScript Proxies that track and trigger updates✓ Correct
3. C.Web Workers running in separate background threads
4. D.CSS variables with automatic browser recalculation

Report an error in this question

Q15. What is Angular's two-way data binding?

1. A.CSS binding between stylesheets and HTML elements
2. B.A database connection pool for managing active queries
3. C.Changes in model automatically update the view and vice versa✓ Correct
4. D.Server-client binding for real-time data synchronization

Report an error in this question

Q16. What is React Router?

1. A.A server framework for building backend APIs
2. B.A library for handling navigation in React apps✓ Correct
3. C.A CSS router for switching between stylesheets
4. D.A physical network router for internet traffic

Report an error in this question

Q17. What is a Higher-Order Component (HOC) in React?

1. A.A component rendering at the top of a page
2. B.A function that takes and returns an enhanced component✓ Correct
3. C.A CSS wrapper element for styling child elements
4. D.A parent component wrapping all child components

Report an error in this question

Q18. What is Vuex/Pinia used for in Vue?

1. A.Managing CSS styles across Vue applications
2. B.Centralized state management for Vue applications✓ Correct
3. C.Managing database connections in Vue projects
4. D.Server-side routing configuration for Vue apps

Report an error in this question

Q19. What is the purpose of Angular's NgModule?

1. A.A CSS module for scoped component styling
2. B.A testing module for automated browser tests
3. C.A class organizing components, directives, and services✓ Correct
4. D.A database module for connection management

Report an error in this question

Q20. What is Next.js?

1. A.A testing tool for automated end-to-end browser tests
2. B.A NoSQL document-oriented database management tool
3. C.A CSS framework for responsive web design layouts
4. D.A React framework supporting SSR and static generation✓ Correct

Report an error in this question

Q21. What is React's Concurrent Mode?

1. A.Parallel CSS processing across multiple browser threads
2. B.Multi-threaded JavaScript execution using Web Workers
3. C.Running multiple separate React applications at once
4. D.Features helping React stay responsive via background rendering✓ Correct

Report an error in this question

Q22. What is the purpose of React.memo()?

1. A.Creating in-app memo or notification features
2. B.A HOC memoizing a component to prevent re-renders✓ Correct
3. C.Saving developer notes within the application code
4. D.Memory management and garbage collection control

Report an error in this question

Q23. What is Angular's Change Detection strategy OnPush?

1. A.A Git branching strategy for version control
2. B.Detecting CSS property changes in stylesheets
3. C.Push notifications sent to mobile device users
4. D.A strategy checking only when input references change✓ Correct

Report an error in this question

Q24. What is the Composition API in Vue 3?

1. A.A music composition tool for creating audio
2. B.A CSS composition method for combining styles
3. C.A database query API for composing SQL queries
4. D.An API organizing component logic using setup()✓ Correct

Report an error in this question

Q25. What is code splitting in frontend frameworks?

1. A.Splitting CSS files into smaller partial files
2. B.Dividing server code into separate microservices
3. C.Splitting HTML files across multiple server routes
4. D.Breaking the bundle into smaller on-demand chunks✓ Correct

Report an error in this question

Q26. What is Server-Side Rendering (SSR) in React/Next.js?

1. A.Rendering CSS on the server before page delivery
2. B.Running JavaScript only on server, never on client
3. C.Generating HTML on the server for each client request✓ Correct
4. D.A database rendering technique for cached query results

Report an error in this question

Q27. What is React's useCallback hook?

1. A.A callback URL handler for authentication flows
2. B.An event listener for handling DOM user events
3. C.A hook returning a memoized callback function✓ Correct
4. D.A state management hook for complex data flows

Report an error in this question

Q28. What is the purpose of useMemo in React?

1. A.Memoizing expensive computations until deps change✓ Correct
2. B.Creating memoized components that never re-render
3. C.Memory allocation and management control utilities
4. D.Managing in-app memo and notification features

Report an error in this question

Q29. What is Angular's Dependency Injection?

1. A.A testing technique for isolating component behavior
2. B.Importing npm packages into project configuration
3. C.A class receiving dependencies from external sources✓ Correct
4. D.Injecting CSS dependencies into component styles

Report an error in this question

Q30. What is Incremental Static Regeneration (ISR) in Next.js?

1. A.Updating static pages after deploy without full rebuild✓ Correct
2. B.Regenerating CSS incrementally during development
3. C.Incremental database updates during data migration
4. D.A version control strategy for incremental releases

Report an error in this question