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