Boost your job readiness with these essential questions and answers.
🔷 Angular Interview Questions
1. What are Angular Components?
Answer: Components are the building blocks of Angular applications. A component controls a view and consists of: Template (HTML), Class (TypeScript), and Metadata (@Component).
2. What is Dependency Injection in Angular?
Answer: DI is a pattern where components receive dependencies instead of creating them. Angular has built-in DI for modular and testable code.
3. What are Observables in Angular?
Answer: Observables are used for asynchronous operations like HTTP requests. They provide operators like .subscribe(), .map(), .filter() using RxJS.
⚛️ React Interview Questions
4. What is the Virtual DOM in React?
Answer: A virtual DOM is a JavaScript representation of the actual DOM. React updates the virtual DOM first and then reconciles it with the real DOM efficiently.
5. What are React Hooks? Name a few commonly used hooks.
Answer: Hooks are functions that let you use state and lifecycle in functional components. Examples: useState(), useEffect(), useRef().
6. Explain the difference between Props and State in React.
Answer: Props are read-only and passed from parent to child. State is managed within the component and can be changed using setState() or useState().
⚙️ .NET Core Interview Questions
7. What is .NET Core and how is it different from .NET Framework?
Answer: .NET Core is a cross-platform, open-source framework for modern apps. It runs on Windows, Linux, and macOS unlike the Windows-only .NET Framework.
8. Explain Middleware in .NET Core.
Answer: Middleware handles requests/responses in the HTTP pipeline. In Startup.cs, it’s configured with methods like app.UseRouting(), app.UseEndpoints().
9. What is Dependency Injection in .NET Core?
Answer: Built-in DI is used to manage object lifetimes. Services are added in Startup.cs using Scoped, Singleton, or Transient lifetimes.
10. What are the differences between IApplicationBuilder, IHostBuilder, and IWebHostBuilder?
Answer:
- IApplicationBuilder: Configures middleware.
- IWebHostBuilder: Used in older ASP.NET Core apps.
- IHostBuilder: Unified model supporting web apps and background services.
✅ Final Tips
Practice building apps using Angular, React, and .NET Core. Learn common tools like Postman, VS Code, Git, and Docker to stand out.
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