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