C# Namespaces Quiz

This quiz is designed to test your understanding of C# Namespaces. It covers key concepts such as the purpose and structure of namespaces, scope, how to resolve naming conflicts, the use of the using keyword, nested namespaces, and file-scoped namespaces. By completing the quiz, you’ll reinforce your knowledge of how namespaces help organize code and avoid naming conflicts in large C# projects.

Which of the following is the correct syntax to declare an alias for a namespace?

scope MyAlias = NamespaceName;

namespace MyAlias = NamespaceName;

alias MyAlias = NamespaceName;

using MyAlias = NamespaceName;

None

Which of the following is not a valid C# namespace declaration?

namespace App::Main { }

namespace GlobalApp { }

namespace MyApp.MyModule { }

namespace DemoApp;

None

Can you access a class in a different namespace without dot notation?

No, dot notation is always required.

Yes, if the namespace is imported using the ‘using’ statement.

No, unless the class is static.

Yes, if the namespace is declared globally.

None

What does the global:: alias in C# do?

It refers to a namespace in another project.

It forces the program to reference the global namespace.

It combines two namespaces.

It removes the need to specify namespaces.

None

What happens when two namespaces contain classes with the same name?

The program will choose the first namespace automatically.

The compiler will ignore the second namespace.

The global namespace will override both classes.

The program will throw an error unless accessed using dot notation.

None

Can you declare multiple namespaces in a single file?

Only when using the ‘using’ keyword.

Yes, multiple namespaces can be declared in a single file.

Only when all namespaces are nested.

No, only one namespace can be declared per file.

None

Which keyword can be used to specify the default namespace for all types in a file?

default

global

root

using

None

What is the correct way to access a nested namespace?

Using the ‘::’ operator with the outer namespace name.

Using the ‘this’ keyword.

Using the dot notation to reference each namespace level.

By importing the nested namespace directly.

None

Why would you use an alias for a namespace in C#?

To combine two namespaces into one.

To restrict access to certain classes.

To shorten long or deeply nested namespace references.

To override global namespaces.

None

10.

What is the effect of omitting the 'namespace' declaration in a file?

The classes are automatically placed in a default namespace.

The classes are ignored by the compiler.

The classes belong to the global namespace.

The classes are made private.

None

11.

What is a valid use case for nested namespaces?

When you need to merge two namespaces.

When combining classes with similar functionality.

When you need to import classes from different projects.

When grouping related functionalities hierarchically.

None

12.

Can a C# namespace span multiple files?

Yes, namespaces can span across multiple files.

Only if they contain nested namespaces.

Only if they are global namespaces.

No, namespaces must be declared in a single file.

None

13.

How does C# handle conflicting class names from different namespaces?

It ignores all class definitions.

It throws a compile-time error unless namespaces are used.

It combines both class definitions.

It automatically chooses the global namespace.

None

14.

What is the main benefit of using file-scoped namespaces in C#?

It makes the code more readable and consistent when only one namespace is used.

It increases the performance of the application.

It prevents access to the global namespace.

It allows multiple namespaces in the same file.

None

15.

What is the purpose of namespaces in C#?

To define access control of methods.

To handle memory allocation.

To organize code and avoid naming conflicts.

To improve performance.

None

16.

What is the purpose of the 'using' keyword when used with aliases?

It creates a shorthand alias for a long or nested namespace.

It allows combining two namespaces.

It imports all classes from another project.

It restricts access to certain classes.

None

17.

How can you access the global namespace explicitly in C#?

By using the alias operator (::) with the keyword ‘global’.

By using the ‘global’ keyword directly.

By importing the namespace with ‘using global’.

By using the ‘this’ keyword.

None

18.

Which statement about file-scoped namespaces is true?

File-scoped namespaces automatically use the global namespace.

File-scoped namespaces cannot include other namespaces.

File-scoped namespaces must contain classes with the same name.

File-scoped namespaces can include other namespaces.

None

19.

How can nested namespaces be declared in C#?

By using file-scoped namespaces.

By using the ‘using’ keyword to import them.

By declaring one namespace inside another using braces.

By declaring all classes at the root scope.

None

20.

What happens if two 'using' statements import namespaces with conflicting class names?

Both namespaces will be ignored.

The program will run successfully with both classes.

The last imported namespace will override the previous one.

An error will be generated at compile-time.

None

21.

Which of the following is an invalid namespace declaration?

namespace Base::App { }

namespace MyApp;

namespace DemoApp { }

namespace MyNamespace1.MyNamespace2 { }

None

22.

How do you access a class from a different namespace in C#?

Using the scope keyword.

Using the namespace alias operator (::).

Placing the class in the global namespace.

Referencing it with the namespace and dot notation.

None

23.

What does the 'using' keyword do in C# with regard to namespaces?

It defines a namespace.

It allows a specific namespace to be used without qualifying it with dot notation.

It merges two namespaces together.

It imports all methods from another namespace.

None

24.

In the absence of a specific namespace, where are classes placed?

In the base namespace.

In the default namespace.

In the root namespace.

In the global namespace.

None

25.

Which of the following correctly declares a namespace?

scope Demo { }

module Demo { }

class Demo { }

namespace Demo { }

None

26.

How can you resolve naming conflicts between classes with the same name?

By using namespaces to place the classes in different scopes.

By combining both classes.

By removing the conflicting class.

By renaming the methods in the class.

None

27.

What happens if two classes in the same scope have the same name?

The classes will be merged.

A syntax error will occur.

The program will run successfully.

The first class will be overwritten.

None

28.

What keyword is used to declare a namespace in C#?

package

scope

namespace

class

None

Time’s up

←C# Tuples Quiz

C# Structures Quiz→

Categories Quiz