Madras University (UnOM) 2005 B.Sc Computer Science operating system - Question Paper

PART A - (10 x three = 30 marks)

ans any TEN ques..All ques. carry equal marks.

every ans should not exceed 50 words.

1. List out the common services given by the operating system.

2.Describe the states of a process.

3. What do you mean by interprocess communication?

4.What is a monitor? provide its syntax.

5.What are external and internal fragmentations?

6.What is paging?

7.List out the different common file kinds.

8.List out the file allocation methods in disk space.





9. elaborate the different kinds of I/O devices classified on their characteristics?

10. describe a bit map and provide its use.

11.What are the goals of protection?

12. What is encryption? discuss the mechanism followed for it?



PART B - (5 x six = 30 marks)

ans any 5 ques.. All ques. carry equal marks.

every ans should not exceed 200 words.

13. define how hardware protection are handled in a system.

14. discuss the different criteria considered for CPU scheduling.

15. define how mutual exclusion is implemented with test-and-set and swap instructions.

16. discuss the segmentation memory management scheme.

17. Write a note on thrashing.

18.Describe the different disk scheduling algorithms.

19. discuss the different methods of implementation of access matrix.



PART C - (4 x 10 = 40 marks)

ans any 4 ques.. All ques. carry equal marks.

every ans should not exceed 500 words.

20. explain the different kinds of operating systems.

21. define any 5 CPU scheduling algorithms.

22. discuss the Banker's algorithm for deadlock avoidance with an example.

23.Describe any 4 page replacement algorithms.

24. explain the different schemes for defining the logical structure of a directory.

25.Write short notes on :

(a) Worms (b)Viruses and (c)Threat monitoring.

Earning:   Approval pending.