1. Java supports which of the following inheritance types?

A. Multiple and Hybrid B. Single, Multilevel, and Hierarchical C. Multiple only D. Hybrid only

2. Which of the following keywords is used to differentiate members of superclass and subclass when they have the same name?

A. this B. super C. base D. parent

3. Which type of inheritance occurs when multiple derived classes inherit from a single base class?

A. Single inheritance B. Multilevel inheritance C. Hierarchical inheritance D. Multiple inheritance

4. Which keyword is used in Java to refer explicitly to a superclass constructor?

A. this B. super C. base D. parent

5. What relationship does the "HAS-A" relationship represent in Java?

A. Inheritance between classes B. Implementation of an interface C. Containment or usage of one class inside another D. Overriding a method in subclass

6. Which of the following is NOT a benefit of inheritance in Java?

A. Code reusability B. Extensibility of features C. Method overriding D. Memory management optimization

7. Which of the following is TRUE about Java inheritance?

A. A class can extend multiple classes directly B. Constructors are inherited by subclasses C. A subclass inherits all members except constructors of a superclass D. Superclasses cannot have private members

8. Which of the following is NOT a valid reason for using inheritance in Java?

A. Code reusability B. Extensibility of functionality C. Achieving encapsulation by hiding data D. Implementing method overriding

9. What will happen if you try to declare a class as `public class extends Animal, Mammal{}` in Java?

A. It will compile and run successfully B. It will cause a syntax error because Java doesn't support multiple inheritance with classes C. It creates a hybrid inheritance class D. It will extend only the first class and ignore the second

10. Consider the following code:

A. printOne() only B. printTwo() only C. printOne() and printTwo() D. None of the above

11. Which statement about interfaces in Java is CORRECT?

A. Classes can extend multiple interfaces B. Classes cannot implement interfaces C. Interfaces can be extended by classes D. Interfaces provide implementation of methods

12. Which of the following inheritance types is NOT supported by Java classes?

A. Single inheritance B. Multilevel inheritance C. Multiple inheritance (extending more than one class) D. Hierarchical inheritance

13. Which statement about method overriding in inheritance is correct?

A. Overriding does not require inheritance B. Overriding allows a subclass to provide a specific implementation for a method already defined in its superclass C. Overriding renames methods in the subclass D. Overriding is only possible for static methods

14. What does the IS-A relationship describe in Java inheritance?

A. An object uses attributes of another object B. An object is a type of another object through inheritance C. One class contains an object of another class D. Two unrelated classes sharing methods

15. How does Java overcome the lack of multiple inheritance of classes?

A. Using abstract classes B. Using interfaces implemented by classes C. Using static classes D. Using inner classes

16. The `instanceof` keyword in Java is used to:

A. Create a new object instance B. Check if an object is of a specified type or subclass thereof C. Compare two objects for equality D. Instantiate an interface directly

17. Consider the following classes: Animal, Mammal extends Animal, and Dog extends Mammal. What is true about Dog in relation to Animal and Mammal?

A. Dog IS-A Mammal but NOT an Animal B. Dog IS-A Animal but NOT a Mammal C. Dog IS-A Mammal and IS-A Animal D. Dog neither IS-A Mammal nor IS-A Animal

18. What is the role of the instanceof operator in Java?

A. To check if an object is an instance of a particular class or interface B. To create new class instances C. To determine the size of an object D. To inherit the properties of a class

19. Which of the following is TRUE about constructors in Java inheritance?

A. Constructors are inherited by subclasses B. Subclasses cannot invoke superclass constructors C. Subclasses can invoke superclass constructors using the super keyword D. Subclasses automatically invoke all superclass constructors

20. What keyword is used in Java to inherit properties from a superclass?

A. implements B. extends C. inherits D. super

21. What syntax is correct for a subclass `Main` extending class `One` in Java?

A. `class Main implement One { ... }` B. `class Main inherits One { ... }` C. `class Main extends One { ... }` D. `class Main use One { ... }`

22. In multilevel inheritance, how many total classes are involved minimally?

A. One B. Two C. Three D. Four

23. What will happen if a class implements two interfaces with conflicting method names?

A. Compilation error B. The class needs to override the conflicting method explicitly C. The subclass inherits both methods automatically D. Only methods from the first interface will be implemented

24. In the context of Java inheritance, what does the HAS-A relationship signify?

A. That a class inherits all methods of another class B. That a class contains or uses another class as a member C. That a class is derived from multiple classes D. That a class cannot be instantiated

25. In Java, what keyword is used to inherit the properties of a superclass by a subclass?

A. implements B. extend C. extends D. inherit

26. If class `Sub` extends class `Super`, which of the following statements is TRUE?

A. Objects of Sub are NOT instances of Super B. Objects of Super are instances of Sub C. Objects of Sub are instances of Super D. Sub can only override static methods of Super

27. What will happen if a subclass method has the same signature as a superclass method?

A. Method overloading B. Method overriding C. Method hiding D. Compilation error

28. Which of these is a true statement about an interface in Java?

A. It can contain method implementations B. A class can only implement one interface C. Interfaces can be implemented by multiple classes D. Interfaces can inherit from classes

29. What will be output if a subclass calls `super.display()`?

A. Calls display method of subclass B. Calls display method of superclass C. Calls display method of another subclass D. Causes runtime error

30. What is the IS-A relationship in Java inheritance?

A. A class containing another class B. A class inheriting properties of another class C. An interface extending a class D. A class implementing multiple interfaces

31. What is the primary reason for using inheritance in Java?

A. To create new data types B. To reuse code and extend functionalities C. To reduce the size of programs D. To prevent access to superclass methods

32. Which of the following is a correct use of the `instanceof` operator?

A. `if(obj instanceof int)` B. `if(obj instanceof ClassName)` C. `if(ClassName instanceof obj)` D. `if(obj instanceof void)`

33. In Java, can a class extend and implement another class and interface respectively at the same time?

A. Yes B. No C. Only if the interface is empty D. Only if the class is abstract

34. Which inheritance type is shown when one base class has multiple derived classes?

A. Single Inheritance B. Multilevel Inheritance C. Multiple Inheritance D. Hierarchical Inheritance

35. What does the term "method overriding" mean in Java?

A. Defining a method with the same name but different parameters B. Defining a method in subclass with the same signature as superclass method C. Writing new methods unrelated to inheritance D. Overloading methods within the same class

36. What type of inheritance is demonstrated when a base class is inherited by a class, and that class is further inherited by another class?

A. Single Inheritance B. Multilevel Inheritance C. Hierarchical Inheritance D. Multiple Inheritance

37. How can a class in Java achieve multiple inheritance-like behavior if extending multiple classes is not allowed?

A. By extending multiple classes using the extends keyword B. By using public class to extend multiple classes C. By implementing multiple interfaces D. It is not possible at all

38. Which of the following best describes "hybrid inheritance"?

A. A class extends more than one class B. A combination of multiple and multilevel inheritance C. A class implements one interface and extends another D. A class contains another class inside it

39. The keyword `implements` in Java is used for:

A. Inheriting from a superclass B. Implementing interfaces C. Dereferencing objects D. Overriding superclass methods

40. Which statement about constructor inheritance is TRUE?

A. Constructors are inherited like other members B. Constructors are never inherited C. Constructors can be accessed outside class hierarchy D. Constructors are inherited only if protected

41. Which type of inheritance is shown when one derived class extends two or more base classes?

A. Single Inheritance B. Multiple Inheritance C. Multilevel Inheritance D. Hierarchical Inheritance

42. Why is the super keyword used in a subclass constructor?

A. To call a method of the subclass B. To call superclass parameterized constructor C. To create a new object D. To override methods

43. What does the `extends` keyword indicate in Java inheritance?

A. The class hides another class B. The class implements an interface C. The class inherits properties and methods from a base class D. The class is contained inside another class

44. In a single inheritance hierarchy, how many base classes exist for one derived class?

A. One B. Two C. Multiple D. None

45. What is the output of the code if a subclass and superclass have variables with the same name and the subclass uses `super.variable`?

A. It accesses the subclass variable B. It accesses the superclass variable C. It causes a compilation error D. It accesses a global variable

46. What happens to private members of a superclass in subclass inheritance?

A. Subclass can access them directly B. They are inherited but not accessible directly C. They cause compilation errors D. Private members are deleted from superclass

47. What does the super keyword do in the context of Java inheritance?

A. Creates a new superclass B. Refers to the current class object C. Differentiates superclass members from subclass members and invokes superclass constructors D. Overrides methods of the superclass

48. Which keyword is used to implement an interface in Java?

A. extends B. inherits C. implements D. interface

49. Which of the following is illegal in Java?

A. A class implementing multiple interfaces B. A class extending a single class C. A class extending multiple classes D. An interface extending multiple interfaces

50. For the following classes:

A. Dog is not an Animal B. Mammal is not an Animal C. Dog instanceof Animal returns true D. Dog cannot extend Mammal