BCA II Sem (Y2K7) - Operating System Question Paper 2009

II Sem B.C.A Examination, June 2009

(Y2K7 Scheme)

COMPUTER SCIENCE

BCA 201 :  Operating System

Time: 3 Hours                                                                                                                   Max.Marks: 80

Instruction: Answer all the parts.

PART - A

Note: Answer any eight questions.                                                                                       (8x3=24)

1. Define operating system. What is time sharing OS?

2. Differentiate between a program and a process.
3. What are operating system services?
4. What is context switching?
5. What are the functions of dispatcher?
6. What are overlays ?
7. Explain the difference between logical and physical addresses.
8. Explain the concept of paging.

9. What are the various methods of file access.
10. Define seektime and rotational delay. 

PART - B

Note: Answer any four questions.                                                                                       (4x14=56)

11. a) Explain system calls with respect to process management and memory management. 

       b) Explain distributed system. What are the advantages and disadvantages?

12. a) Describe about PCB its detail.

       b) What are scheduling criteria? Explain briefly.

13. a) What is a dead lock? Discuss any two methods Of dead lock prevention.

       b) Explain critical regions.

14. a) Explain demand page memory management system with a neat diagram.

       b) Explain LRU page replacement algorithm with an example.

15. a) Explain single level and two level directory structure.

       b) Explain any two disk scheduling algorithms.

16. Write short notes:

      a) Methods of authentication

      b) Co-operating processes

      c) Semaphores