Q1) OOPS is abbreviated as object oriented programming system in which programs are considered as a collection of object .each object is nothing but an instance of a class. followings are features of OOPS: 1)Encapsulation 2)Polymorphism 3)Inheritance 4)Abstraction Q2) Inheritance : In inheritance is a concept where one class shares the structure and the behavior defines in another class . Q)3 Polymorphism : Polymorphism is nothing but assigning behavior or value in a subclass to some that was already declared in the main class .simply polymorphism takes more than one form.