1. Which of the following are keywords? (A) switch (B) integer (C) default (D) boolean (E) object   (A) & (C)   (B) & (C)   (D)   (E)   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   All of these.   (A), (C) & (E)   (B),(C) & (D)   (C) & (E)   Half-n-half Clue   3. Which of the following defines a legal abstract class?   abstract class Vehicle {<br>               abstract void display(); {<br>                 System.out.println("Car"); }}   class Vehicle {<br>               abstract void display(); }   class abstract Vehicle {<br>               abstract void display(); }   abstract Vehicle {<br>               abstract void display(); }   abstract class Vehicle {<br>               abstract void display(); }   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   (D)   (A) & (C)   (B) & (C)   (A)   Half-n-half Clue   5. Consider the following code: interface Area   Interface definition is incomplete   All of these   Method compute() in interface Area should be declared public   Method compute() in class Room should be declared public   Half-n-half Clue   6. Which of the following keywords are used to control access to a class member? (A) default (B) abstract (C) protected (D) interface (E) public   (C) & (E)   All of these.   (B), (C) & (E)   (A), (C) & (E)   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