a ) 1. single level inheritance
2. multi level inheritance
3. multiple inheritance
4. hierarchical inheritance
32. Can we inherit the private members of a class
a ) Yes. But they are not accessible.
33. Why we use the keyword virtual?
a ) When you want to override a method of base class in derived class you should use this virtual keyword to the method in base class
34. Why we use override keyword?
a ) When you want to override a method of base class in derived class you should use this override keyword to the method in derived class
35. What are the abstract classes?
a ) Abstract classes are the classes for which we can not create objects. Means an abstract class can not be instantiated.
36. What are abstract methods?
a ) Abstract methods are the methods which does not contain their body part means they does not provide any implementation.
37. What are the properties of abstract methods?
a ) 1. they do not contain body part.
2. their definition/implementation should be given in non-abstract classes by overriding that method.
3. we can not use static modifier to it.
38. What are the sealed classes?
a ) If you want to prevent a class from being inherited you can use this keyword sealed to that particular class
39. What are sealed methods?
a ) A sealed method is a method which can not be overridden by its derived class.
40. Does a sealed class is an abstract class? Why?
a ) No a sealed class is not an abstract class. Because we can’t inherit a sealed class but we can inherit an abstract class.
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