1. DI in ASP.NET Core primarily helps with
A) Performance
B) Loose coupling & testability ✅
C) UI rendering
D) Deployment
2. Which lifetime creates a new instance per HTTP request?
A) Singleton
B) Scoped ✅
C) Transient
D) ThreadStatic
3. Which DI lifetime should DbContext use?
A) Singleton
B) Scoped ✅
C) Transient
D) Static
4. If a Singleton depends on a Scoped service, what can happen?
A) Faster execution
B) Memory leak ✅
C) Thread lock
D) No effect
5. Where are services registered in .NET Core?
A) Web.config
B) Program.cs ✅
C) AppSettings.json
D) StartupController.cs
Middleware MCQs
6. Middleware executes in:
A) Random order
B) Fixed pipeline sequence ✅
C) Compiler decides
D) Based on thread pool
7. Which method MUST be called in custom middleware?
A) Task.Run
B) builder.Build
C) await next() ✅
D) UseMvc
8. Which is used to add routing?
A) app.UseAuthorization()
B) app.UseRouting() ✅
C) app.UseEndpoints()
D) app.MapControllers()
9. Middleware that runs FIRST for error handling?
A) UseAuthorization
B) UseExceptionHandler ✅
C) UseCors
D) MapEndpoints
10. Real order in ASP.NET Core pipeline?
A)
Auth → Routing → Exception
B)
Exception → Routing → Auth ✅ → Endpoint
C)
Endpoint → Auth → Exception
D)
Auth → Endpoint → Routing
Memory & Performance MCQs
11. What causes memory leaks in .NET Core most commonly?
A) No GC
B) Event handlers not unsubscribed ✅
C) Exception handling
D) Logging
12. GC collects?
A) Unmanaged memory
B) Managed memory ✅
C) Database connections
D) Threads
13. Which tool helps detect memory issues?
A) IIS Manager
B) Visual Studio Diagnostic Tools ✅
C) NuGet Manager
D) Windows Firewall
14. Purpose of IDisposable?
A) Compile code
B) Dispose unmanaged resources ✅
C) Debug logs
D) Speed up runtime
15. Best way to prevent memory leaks?
A) Never use Static
B) Use using & proper DI ✅
C) Avoid async
D) Restart server