Xamarin Certification Xamarin Cross-Platform Architecture

Question 1

What is the Shared Project approach in Xamarin cross-platform development?

Accepted Answer

Source files shared across platform projects at compile time with no output assembly

Answer

A NuGet package containing shared code

Answer

A runtime abstraction layer

Answer

A Git submodule strategy

Question 2

What is a Portable Class Library (PCL) in Xamarin development?

Accepted Answer

A compiled library targeting a common API subset usable across multiple platforms

Answer

A shared project with platform directives

Answer

A NuGet-only distribution format

Answer

An Android-specific class library

Question 3

Which .NET project type replaced PCL as the preferred Xamarin shared library format?

Accepted Answer

.NET Standard Library

Answer

Shared Project

Answer

Class Library (net6)

Answer

Universal Library

Question 4

In Xamarin cross-platform development, what is the Dependency Service used for?

Accepted Answer

Resolving platform-specific implementations from shared code

Answer

Injecting database services

Answer

Managing HTTP dependencies

Answer

Registering NuGet packages at runtime

Question 5

What design pattern is recommended for separating UI logic from business logic in Xamarin applications?

Accepted Answer

MVVM (Model-View-ViewModel)

Answer

MVC (Model-View-Controller)

Answer

MVP (Model-View-Presenter)

Answer

VIPER

Question 6

Which interface must a ViewModel implement to notify the View of property changes in Xamarin MVVM?

Accepted Answer

INotifyPropertyChanged

Answer

IObservable

Answer

IDataBinding

Answer

IViewModel