.NET - Object-Oriented Programming

9.
What is the index value of the first element in an array?
In an array, the index value of the first element is 0 (zero).

10.
Can you specify the accessibility modifier for methods inside the interface?
All the methods inside an interface are always public, by default. You cannot specify any other access modifier for them.

11.
Is it possible for a class to inherit the constructor of its base class?
No, a class cannot inherit the constructor of its base class.

12.
How is method overriding different from method overloading?
Overriding involves the creation of two or more methods with the same name and same signature in different classes (one of them should be parent class and other should be child).

Overloading is a concept of using a method at different places with same name and different signatures within the same class.