MCA MAGADH UNIVERSITY QUESTION ( 2010-2013) (second semester) OPERATING SYSTEMS

MCA MAGADH UNIVERSITY QUESTION ( 2010-2013) (second semester) OPERATING SYSTEMS

                                                                 

                                                                        2010-2013
                                                                      Full Marks: 80
                                                                      Time : 4 hours
                                                              Answer any five questions


(1). What is Operating systems? Explain the various types of OS given examples of each.

(2). What is process ? How does it change its stages in system?

(3). Explain the following CPU scheduling algorithm:
      (a) FCFS
      (b) SJF
      (c) Round Robin
      (d) Priority

(4). What is segimentation ? How is it different from paging?

(5). Explain page replacement algorithm using the reference string for a memory with four frames 1,2,3,4,2,1,5,6,2,1,2,3,7,6,3,2,1,2,3,6
 
          a. Give the number of page faults which would occur using-
         (a) FIFO
         (b) Optimal algorithm
         (c) LRU algorithm

6. (a) Write the difference between paging and segmentation.
    (b). How does virtual memory improve the performance of CPU ?

7. Write the conditions for a deadlock. Explain the deadlock prevention technique.

8. What do you mean by disk scheduling? Explain FCFS and SCAN  scheduling.

9. Explain the following:
    (a) File Attributes
    (b) File Access

10. Write the syntax, description and example of any five internal and external DOS commands.

11. Compare and contrast the use of monitors and semaphore operations.

12. Write short notes on any three of the following:
      (a). Clocks
      (b). Distributed file system
      (c). DMA
      (d). UNIX
      (e). Semaphore