C# .Net Quizz Dive into our tech quiz zone and put your technical skills to the test! Our quizzes cover a wide array of technical topics, perfect for sharpening your knowledge and challenging your understanding. Compete with others, see your rankings, and boost your technical proficiency. Start quizzing today! 1 / 29 1. Which of the following design patterns is used to convert the interface of a class into another interface that clients expect? Composite Bridge Facade Adapter 2 / 29 2. What will be the output of the following code? public class Singleton { private static Singleton _instance; private Singleton() { } public static Singleton Instance { get { if (_instance == null) { _instance = new Singleton(); } return _instance; } } public void Print() { Console.WriteLine("Singleton instance"); } } public class Program { public static void Main() { Singleton.Instance.Print(); } } Compilation error NullReferenceException Runtime error Singleton instance 3 / 29 3. What will be the output of the following code? public class Test { public static void Main(string[] args) { int x = 5; object y = x; y = 10; Console.WriteLine(x); } } 5 Runtime error Compilation error 10 4 / 29 4. What does the DbContext class represent in Entity Framework? The database migrations The session with the database and allows querying and saving data The database schema The connection string to the database 5 / 29 5. Which design pattern provides an interface for creating families of related or dependent objects without specifying their concrete classes? Decorator Prototype Builder Abstract Factory 6 / 29 6. Which design pattern ensures a class has only one instance and provides a global point of access to it? Singleton Builder Factory Adapter 7 / 29 7. Which feature of C# allows the definition of methods that can be overridden in derived classes? Polymorphism Inheritance Encapsulation Abstraction 8 / 29 8. What does the ConfigureAwait(false) method do in an asynchronous call? It ensures the continuation runs on the same thread It throws an exception if the task fails It cancels the asynchronous task It ensures the continuation does not run on the captured context 9 / 29 9. What is the purpose of the lock statement in C#? To prevent a thread from being aborted To provide a mechanism for mutual exclusion To ensure that a block of code runs only once To create a new thread 10 / 29 10. What will be the output of the following code? Type type = typeof(string); MethodInfo method = type.GetMethod("Substring", new[] { typeof(int), typeof(int) }); var result = method.Invoke("Hello, World!", new object[] { 7, 5 }); Console.WriteLine(result); llo, , Wor World Hello 11 / 29 11. What is the purpose of the AsParallel method in PLINQ? To convert a query into parallel execution To filter elements based on a condition To sort a collection in parallel To convert a query into sequential execution 12 / 29 12. What will be the output of the following code? int[] numbers = { 1, 2, 3, 4, 5 }; var query = from num in numbers where num % 2 == 0 select num; numbers[1] = 0; Console.WriteLine(query.First()); 2 Compilation error 0 4 13 / 29 13. What will be the output of the following code? public async Task<int> GetData() { await Task.Delay(1000); return 42; } public async Task PrintData() { int data = await GetData(); Console.WriteLine(data); } Compilation error 42 after a delay 42 immediately Runtime error 14 / 29 14. What does the Type.GetType method do? It retrieves a Type object for a specified type name It returns the type of an object It gets the base type of a class It creates a new instance of a type 15 / 29 15. Which of the following is not a valid access modifier in C#? private external protected internal 16 / 29 16. Which keyword is used in LINQ to create a new anonymous type? from var new select 17 / 29 17. What is the purpose of the dynamic keyword in C#? To handle exceptions dynamically To enable late binding To create anonymous types To define variables that can change type 18 / 29 18. Which of the following is a use case of reflection in C#? Creating user interfaces Compiling code dynamically Accessing metadata of assemblies Serializing objects 19 / 29 19. What will be the output of the following code? public class Program { public static void Main() { Thread t = new Thread(Print); t.Start(); t.Join(); Console.WriteLine("Main thread"); } public static void Print() { Thread.Sleep(1000); Console.WriteLine("Worker thread"); } } Worker threadnMain thread Worker thread Main thread Main threadnWorker thread 20 / 29 20. What is the primary purpose of reflection in C#? To execute code at runtime To compile code dynamically To inspect and interact with types at runtime To handle exceptions 21 / 29 21. Which of the following best describes the await keyword in C#? It creates a new task It runs a task synchronously It pauses the execution of an asynchronous method until the awaited task completes It starts a new thread 22 / 29 22. What is the primary benefit of the Dependency Injection pattern? Reduced code complexity Improved code readability Enhanced code reusability Improved testability and flexibility 23 / 29 23. What keyword is used to allow a derived class to extend or modify the behavior defined in the base class method? new override abstract virtual 24 / 29 24. What is the primary purpose of the using statement in C#? To declare constants To ensure the correct use of IDisposable objects To manage threading To include namespaces 25 / 29 25. Which class in the .NET Framework provides a mechanism to schedule and execute background tasks? ThreadPool Thread Timer Task 26 / 29 26. Which of the following is a correct way to handle exceptions in asynchronous methods? Using try-catch within the async method Using await without try-catch Using Task.Run with try-catch Using Task.Wait with try-catch 27 / 29 27. What is the primary purpose of the async keyword in C#? To synchronize threads To declare a thread To mark a method as asynchronous To define a delegate 28 / 29 28. What is the purpose of the Monitor class in C#? To create threads To manage thread priorities To implement critical sections To abort threads 29 / 29 29. Which of the following is a deferred execution method in LINQ? Where() First() Count() ToList() Your score is 0%
