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?int[] numbers = { 1, 2, 3, 4, 5 };var query = from num in numberswhere num % 2 == 0select num;numbers[1] = 0;Console.WriteLine(query.First()); 2 0 4 Compilation error 2 / 29 2. What keyword is used to allow a derived class to extend or modify the behavior defined in the base class method? new abstract override virtual 3 / 29 3. Which design pattern ensures a class has only one instance and provides a global point of access to it? Adapter Factory Builder Singleton 4 / 29 4. Which of the following best describes the await keyword in C#? It starts a new thread It pauses the execution of an asynchronous method until the awaited task completes It runs a task synchronously It creates a new task 5 / 29 5. What does the ConfigureAwait(false) method do in an asynchronous call? It ensures the continuation does not run on the captured context It ensures the continuation runs on the same thread It cancels the asynchronous task It throws an exception if the task fails 6 / 29 6. What is the primary purpose of the async keyword in C#? To declare a thread To define a delegate To mark a method as asynchronous To synchronize threads 7 / 29 7. 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, World , Wor Hello 8 / 29 8. What is the primary purpose of reflection in C#? To compile code dynamically To inspect and interact with types at runtime To handle exceptions To execute code at runtime 9 / 29 9. What is the purpose of the AsParallel method in PLINQ? To convert a query into sequential execution To convert a query into parallel execution To sort a collection in parallel To filter elements based on a condition 10 / 29 10. 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 11 / 29 11. Which feature of C# allows the definition of methods that can be overridden in derived classes? Encapsulation Abstraction Inheritance Polymorphism 12 / 29 12. Which of the following is a deferred execution method in LINQ? Where() ToList() Count() First() 13 / 29 13. 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 14 / 29 14. 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 15 / 29 15. What does the DbContext class represent in Entity Framework? The database schema The session with the database and allows querying and saving data The connection string to the database The database migrations 16 / 29 16. Which of the following is a use case of reflection in C#? Accessing metadata of assemblies Compiling code dynamically Serializing objects Creating user interfaces 17 / 29 17. What is the primary benefit of the Dependency Injection pattern? Improved code readability Enhanced code reusability Reduced code complexity Improved testability and flexibility 18 / 29 18. 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();}} NullReferenceException Singleton instance Compilation error Runtime error 19 / 29 19. Which of the following is not a valid access modifier in C#? protected private internal external 20 / 29 20. What is the purpose of the lock statement in C#? To prevent a thread from being aborted To create a new thread To ensure that a block of code runs only once To provide a mechanism for mutual exclusion 21 / 29 21. What is the primary purpose of the using statement in C#? To ensure the correct use of IDisposable objects To manage threading To include namespaces To declare constants 22 / 29 22. 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);} 42 after a delay Compilation error Runtime error 42 immediately 23 / 29 23. What is the purpose of the dynamic keyword in C#? To enable late binding To handle exceptions dynamically To create anonymous types To define variables that can change type 24 / 29 24. Which of the following design patterns is used to convert the interface of a class into another interface that clients expect? Adapter Facade Composite Bridge 25 / 29 25. Which class in the .NET Framework provides a mechanism to schedule and execute background tasks? Thread Task ThreadPool Timer 26 / 29 26. 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);}} 10 Compilation error 5 Runtime error 27 / 29 27. What is the purpose of the Monitor class in C#? To create threads To manage thread priorities To abort threads To implement critical sections 28 / 29 28. Which design pattern provides an interface for creating families of related or dependent objects without specifying their concrete classes? Abstract Factory Builder Prototype Decorator 29 / 29 29. Which keyword is used in LINQ to create a new anonymous type? new select var from Your score is 0%
