Unit 1: Introduction To .Net And C# - Practice Quiz

1 What is ASP.NET Core primarily used to build?

2 Which feature allows ASP.NET Core applications to run on Windows, Linux, and macOS?

3 Which version was the first official release of ASP.NET Core?

4 Starting with which version did Microsoft drop the word "Core" from the main .NET platform name?

5 Which platform is designed to run on Windows, Linux, and macOS?

6 Which platform is primarily associated with older Windows-only applications?

7 What must be installed to create and run .NET applications from VS Code?

8 Which VS Code extension provides language support for C# development?

9 Which command creates a new .NET console application?

10 Which .NET CLI command compiles a project?

11 Which .NET CLI command runs a project from its source code?

12 Which component executes managed .NET applications?

13 Which package manager is commonly used to add libraries to .NET projects?

14 Who developed the C# programming language?

15 Which programming style is directly supported by C#?

16 Which C# version introduced the async and await keywords?

17 Which C# version introduced nullable reference types?

18 What does the C# compiler normally produce from C# source code?

19 What does the Just-In-Time compiler do during C# program execution?

20 Which Visual Studio workload is commonly selected for creating C# console applications?

21 A team wants the same ASP.NET Core web application to run behind IIS on Windows and Nginx on Linux. Which ASP.NET Core feature most directly supports this requirement?

22 An ASP.NET Core application needs a different email service implementation during automated testing. Which built-in feature is best suited to this requirement?

23 A legacy project targets ASP.NET Core 2.2. The team wants to move to the first ASP.NET Core release that followed the unified .NET naming introduced after .NET Core 3.1. Which target should it choose?

24 A company prioritizes a longer support period for a production ASP.NET Core application. Which release type should it normally select?

25 An existing application depends heavily on ASP.NET Web Forms and Windows-specific libraries. Which platform is the most practical target if the application will remain Windows-only and cannot be substantially rewritten?

26 Two applications on one Linux server must use different runtime versions without changing the machine-wide runtime. Which capability of .NET Core or modern .NET best addresses this?

27 After installing VS Code and the C# extension, a developer opens a new terminal but the dotnet command is not recognized. What is the most likely missing component?

28 A developer can edit C# files in VS Code but cannot build or debug a newly cloned project. Which sequence is the most appropriate first check?

29 A developer has modified package references in a project file and wants to download the required NuGet packages without compiling the project. Which command should be used?

30 A team needs deployment-ready output containing the application and its required files in a selected folder. Which command is designed for this task?

31 A library author wants one compiled API contract to be usable by multiple compatible .NET implementations. Which concept was designed to define that shared API surface?

32 Which component executes managed .NET code and provides services such as garbage collection and exception handling?

33 A method must accept objects that provide a Save() operation, even when their classes do not share a base implementation. Which C# construct best expresses this contract?

34 What is the result of the following C# code?

int x = 7;

int y = 2;

double result = x / y;

35 A developer wants to use nullable reference type annotations such as string? to improve null-safety analysis. In which C# version was this feature introduced?

36 A project uses record declarations to model immutable data-oriented types with value-based equality. Which language version first introduced records?

37 When a C# project is built, what does the C# compiler normally produce before the runtime executes the program?

38 A .NET application starts running a method for the first time. Which process commonly converts that method's intermediate language into native machine instructions?

39 During Visual Studio installation, a student wants the templates and tools needed to build ASP.NET Core applications. Which workload should be selected?

40 Visual Studio opens a C# project but reports that its target framework cannot be found. What is the most appropriate corrective action?

41 An ASP.NET Core app must serve static files without authentication, authenticate MVC requests, and ensure endpoint-specific authorization policies are evaluated. Which middleware order is correct?

42 A singleton service constructor receives a scoped DbContext. Scope validation is enabled. What is the correct diagnosis and redesign?

43 An ASP.NET Core app behind a TLS-terminating reverse proxy repeatedly redirects HTTPS requests back to HTTPS. The proxy forwards X-Forwarded-Proto: https, but the app observes HTTP. Which change most directly addresses the loop?

44 A legacy application targets ASP.NET Core 2.1 and relies on running either on .NET Core or on the full .NET Framework. A team proposes upgrading directly to ASP.NET Core 3.0 while keeping the full .NET Framework target. What blocks that plan?

45 Which migration issue most specifically reflects the routing change introduced with ASP.NET Core 3.0?

46 A Windows-only ASP.NET MVC 5 application heavily uses System.Web, but a new Linux service must reuse its platform-neutral business rules. Which architecture is most viable?

47 Two applications on one server require incompatible runtime patch levels and must be deployed without changing the machine-wide .NET installation. Which .NET capability best satisfies this requirement?

48 A repository contains Api/Api.csproj and Tests/Tests.csproj, but no solution file. VS Code is opened at the repository root, and a build task runs dotnet build with no arguments. The CLI reports that it cannot determine which project to use. What is the most maintainable fix?

49 A VS Code debugger successfully launches an ASP.NET Core project, but the app uses Production settings even though launchSettings.json defines ASPNETCORE_ENVIRONMENT=Development. The debug configuration launches the compiled DLL directly. What best explains the behavior?

50 A CI pipeline runs dotnet restore --locked-mode followed by dotnet build --no-restore. A developer changes a package reference without updating the lock file. What should happen?

51 Which command publishes a Linux x64 application with its own runtime and permits execution on a compatible host without a separately installed .NET runtime?

52 A repository requires every developer and CI agent to use the same version of a custom dotnet tool without installing it globally. Which setup provides reproducible tool resolution?

53 A framework-dependent application targets net8.0. A machine has only .NET 9 installed, and the application's runtime configuration uses the default roll-forward behavior. What is the expected result?

54 A project builds successfully with .NET SDK 8, but running its framework-dependent output on a server fails with a message that the required framework is missing. Which statement reconciles these facts?

55 Consider var actions = new List<Action>(); for (int i = 0; i < 3; i++) actions.Add(() => Console.Write(i));. What is printed when all actions execute after the loop?

56 A library targets netstandard2.0 but is compiled with a modern SDK. The team wants to use C# records while preserving the same target framework. Which statement is most accurate?

57 A project enables nullable reference types and changes string Name to string? Name. Which consequence is most accurate for ordinary .NET execution?

58 A release build calls a generic method M<T> with both string and object, then with both int and double. Which JIT behavior is generally expected?

59 Which sequence best describes normal execution of a framework-dependent C# application without ahead-of-time native compilation?

60 Visual Studio can open an existing net8.0 project as text, but reports that the target framework is unsupported and cannot build it. The machine has an older Visual Studio release and only a .NET 6 SDK. What is the correct remediation?