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