1. Which of the following defines a legal abstract class?   abstract Vehicle {<br>               abstract void display(); }   class Vehicle {<br>               abstract void display(); }   abstract class Vehicle {<br>               abstract void display(); }   class abstract Vehicle {<br>               abstract void display(); }   abstract class Vehicle {<br>               abstract void display(); {<br>                 System.out.println("Car"); }}   Hint Half-n-half Clue   2. We would like to make a member of a class visible in all subclasses regardless of what package they are in. Which one of the following keywords would achieve this?   private OR protected   private   protected   public   Half-n-half Clue   3. The keywords reserved but not used in the initial version of Java are: (A) union (B) const (C) inner (D) goto (E) boolean (F) synchronized   (B),(C) & (D)   All of these.   (A), (C) & (E)   (C) & (E)   Half-n-half Clue   4. Package p1 contains the following code: package p1; public class Student   Result body is not fully defined.   Class result should be declared public.   Test class is not available.   Student class is not available.   Half-n-half Clue   5. Consider the following code: interface Area   All of these   Method compute() in interface Area should be declared public   Method compute() in class Room should be declared public   Interface definition is incomplete   Half-n-half Clue   6. The use of protected keyword to a member in a class will restrict its visibility as follows:   Visible only in the class and its subclass in the same package.   Visible only in the class where it is declared.   Visible only inside the package.   Visible in all classes in the same package and subclasses in other packages.   Half-n-half Clue   7. Which of the following statements about abstract methods/classes in Java are true? 1. An abstract class cannot be instantiated. 2. Constructors cannot be abstract. 3. A subclass of an abstract class must defined the abstract methods. 4. Static methods may be declared abstract.   Line 1, line 2 and line 3 only   Line 1 only   Line 1 and line 2 only   Line 2 only   All are true   Half-n-half Clue