MCA MAGADH UNIVERSITY QUESTION (2004-2007) (second semester) Operating system

MCA MAGADH UNIVERSITY QUESTION (2004-2007) (second semester) Operating system

                                                                          2004-2007
                                                                       Full marks: 80
                                                                      Time: 4 hours
                                                               Answer any five questions

1. Fill in the blanks:
    a) _________ is used to list the directory contexts in UNIX.
    b) ___________ is a primitive scheduling technique.
    c) The short - term scheduler sends the process to ___________
    d) ___________ Share resources common to them
    e) Turn around time is the sum of ________ and _________.
    f) __________ is the file system used in window operating system.
    g) The consistency check of the file system in UNIX  is done by ___________ command.
    h)  __________ OS  are systems with time as key parameter.
    i) Windows CE is a __________ operating system.
    j) A process called ___________ reads the date from the terminal.

2. a) What is the need for interprocess synchronization ?
    b) Explain the various techniques used for synchronization of processes.

3. a) What is spooling? Do you think that advanced personal computers will have spooling as a standard teacher in future.
    b) Differentiate between trap and interrupt ?
    c) A computer has a pipeline with four stages? Each stage takes the same time to do the work, namely insec. How many instruction per second the machine can execute?

4. a) What do you mean by file system? Explain? The file organization used by UNIX os.
    b) Give an brief account of security and protection mechanism in UNIX.

5.a) What do you mean by producer- consumer problem? Give an algorithm to solve the same.
  b) Explain briefly hardware- support for mutual exclusion? How they same can be used in salving synchronization problem.

6. a) What is direct memory Access/ how it can be good solution in modern o/s input/ output system.
    b) What do you mean by disk- scheduling? Give any one disk- scheduling of your choice include the regions for the relection of the algorithm.

7. a) What do you mean by memory mapped terminals? When will you suggest the use of such terminals?
   b) What is the significance of implementing clocks in operating system? Explain different types of clock implementation. What are soft timers?

8. a) Discuss preemptable and non- preemptable resources.
    b) Write  a short note on Deadlocks.
    c) What do you mean by deadlock detection avoidance and prevention?

9.  Write short notes on the following ( any three)
     a) Semaphore
     b) Distributed file system
     c) MS- DOS
     d) Raid
     e) Threads
     f) Two phase locking