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