1. Which of the following defines a legal abstract class?   class Vehicle {<br>               abstract void display(); }   abstract Vehicle {<br>               abstract void display(); }   class abstract Vehicle {<br>               abstract void display(); }   abstract class Vehicle {<br>               abstract void display(); {<br>                 System.out.println("Car"); }}   abstract class Vehicle {<br>               abstract void display(); }   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   private OR protected   public   protected   Half-n-half Clue   3. Which of the following statements are true? (A) An abstract class may not have any final methods. (B) A final class may not have any abstract methods. (C) An inner class may be declared with any accessibility keyword. (D) Transient variables must be static.   (A) & (C)   (D)   (B) & (C)   (A)   Half-n-half Clue   4. The concept of multiple inheritance is implemented in Java by (A) extending two or more classes (B) extending one class and implementing one or more interfaces (C) implementing two or more interfaces (D) all of these   (A) & (C)   (A)   (D)   (B) & (C)   Half-n-half Clue   5. Which keyword can protect a class in a package from accessibility by the classes outside the package?   final   private   protected   don't use any keyword at all (make it default)   Half-n-half Clue   6. 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   7. The use of protected keyword to a member in a class will restrict its visibility as follows:   Visible only in the class where it is declared.   Visible only in the class and its subclass in the same package.   Visible in all classes in the same package and subclasses in other packages.   Visible only inside the package.   Half-n-half Clue