C# Programming - MCQ Practice Questions

What is the purpose of the 'sealed' keyword in C#?

In C#, what is the difference between a class and a struct?

Which of the following represents proper use of constructor chaining in C#?

In C# 2024-25, which feature allows defining read-only properties with automatic backing fields?

In C# 11, which feature allows you to define required members in a class?

What is the output when you access a property marked with 'init' accessor after object initialization in C#?

What is the primary difference between method overloading and method overriding in C#?

What will be the behavior if a base class method is not marked as 'virtual' and a derived class attempts to override it?

Which statement about record types in C# 9+ is correct?

In C#, what is the correct way to implement explicit interface implementation?

In C#, what is the relationship between composition and inheritance in OOP design?

In C# 11, which feature enables you to define constraints on generic type parameters at compile-time?

What does the 'virtual' keyword enable in C#?

Consider a BankAccount class with private balance field. How should external classes access this field safely?

A developer creates a class Library and another class Book. The Library class contains multiple Book objects. What is this relationship called?

In C# 9+, which feature allows you to create immutable reference types?

What is the output of the following code? class Animal { public virtual void Sound() { Console.WriteLine("Generic Sound"); } } class Dog : Animal { public override void Sound() { Console.WriteLine("Bark"); } } Dog dog = new Dog(); dog.Sound();

An abstract class Shape has an abstract method CalculateArea(). Which statement is true?

In C#, what is the difference between 'is' and 'as' operators?

In C# 13+ (projected features), nullable reference types help prevent which type of error?