Question 1 :
Multiple inheritance is different from multiple levels of inheritance.
Multiple inheritance means deriving a class from more than one classes. On the other hand, multiple levels of inheritance means a class has been derived from a base class and the base class itself has been derived from another base class. Multiple inheritance is not permitted in C#.NET.
Question 2 :
An object of a derived class cannot access private members of base class.
The private members of the base class are never accessible outside the class.
Question 3 :
The way a derived class member function can access base class public members, the base class member functions can access public member functions of derived class.
Base class cannot access derived class members since it does not have any knowledge of the derived class.
Question 4 :
There is no private or protected inheritance in C#.NET.
Question 5 :
We can derive a class from a base class even if the base class's source code is not available.
We can derive from a base class even if it is present in an assembly.