TechAhead interview question

1. Difference between class and object. 2. Difference between abstract class and interface. 3. Difference between call by method and call by reference. 4 Significance of call by method and call by reference. 5. Create a Java program to find angle between the minute hand and hour hand of clock. Values for minute hand and hour hand will be entered by the user. 6. Difference between final, finally and finalize in Java. 7. OOPS and Java features. Why to use Java only. 8. Difference between smalltalk and Java. 9. College projects explanation.