C# Programming - MCQ Practice Questions

Which of the following is a nullable type in C#?

In C#, what does the 'params' keyword allow you to do?

What will be the output of: string s1 = "Hello"; string s2 = "Hello"; Console.WriteLine(s1 == s2);

Which collection type in C# maintains insertion order and allows duplicate elements?

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

Which of the following best describes LINQ in C#?

What is the main purpose of the 'finally' block in C#?

What is the output of: int x = 10; int y = x++; Console.WriteLine(x + " " + y);

Which keyword is used to create a constant variable in C# that cannot be changed?

Which of the following is true about the 'var' keyword in C#?

What is the output of: char ch = 'A'; Console.WriteLine((int)ch);

Which statement about method overloading in C# is correct?

Which of the following correctly demonstrates the ternary operator in C#?

Which of the following statements about ref and out parameters in C# is correct?

What will be the behavior of the following code snippet? string str = null; string result = str?.ToUpper() ?? "DEFAULT"; Console.WriteLine(result);

What is the difference between 'is' and '==' operators when comparing object references in C#?

What will be the output of the following code? class A { public virtual void Show() { Console.WriteLine("A"); } } class B : A { public override void Show() { Console.WriteLine("B"); } } A obj = new B(); obj.Show();

What is the difference between 'new' keyword and 'override' keyword in C#?

In C#, which interface is used to implement custom iteration logic?

Which of the following is true about properties in C#?