1. Which of the following are not keywords? (A) NULL (B) implements (C) protected (D) extended (E) string   (C), (D) & (E)   (A), (D) & (E)   (D) & (E)   (D)   Hint Half-n-half Clue   2. 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   3. Consider the following code: class ClassA   Error. ClassB does not define a no-argument constructor   Error. There is no code in the class ClassB   Will compile and run successfully   Error. ClassA does not define a no-argument constructor   Error. There is no code in the constructor ClassA(int x)   Half-n-half Clue   4. Which of the following are keywords? (A) switch (B) integer (C) default (D) boolean (E) object   (D)   (E)   (B) & (C)   (A) & (C)   Half-n-half Clue   5. Consider the following code: interface Area   Interface definition is incomplete   Method compute() in class Room should be declared public   Method compute() in interface Area should be declared public   All of these   Half-n-half Clue   6. 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   (D)   (B) & (C)   (A)   (A) & (C)   Half-n-half Clue   7. Which keyword can protect a class in a package from accessibility by the classes outside the package?   private   protected   final   don't use any keyword at all (make it default)   Half-n-half Clue