1. What is Abstraction in OOPS?

2. Which keyword is used to declare an abstract class in Java?

3. Can we create an object of an abstract class?

4. Which is true about abstract methods?

5. If a class contains at least one abstract method, then the class must be?

6. Which of the following can be abstract?

7. Which keyword is used to inherit an abstract class?

8. A non-abstract class extending an abstract class must:

9. Which is true about abstract class constructors?

10. Can abstract class have non-abstract methods?

11. Which access modifier is NOT allowed for abstract methods?

12. What is the main purpose of abstraction?

13. Which is correct about abstract class variables?

14. Can an abstract class extend another abstract class?

15. What happens if subclass does not override abstract method?

16. Which is true?

17. Can abstract methods be static?

18. Which is correct about abstract class and interface?