Maharashi Dayanand University (MDU) 2007 M.C.A Computer Operating System & Unix - Question Paper

Q1.(a) define how an operating system can be considered as a resource manager.
(b) System calls are extended instructions how? List any 2 services given by system calls.

Q2. (a) elaborate the reasons for building a distributed operating system? How is it various from a
timesharing and multiprogramming system?
(b) What is the cause for race condition? provide 1 method of avoiding race Condition.

Q3.(a) What is a thread? Why is it gaining popularity?
(b) What is the function of a scheduler? Under what circumstances does CPU scheduling take place?

Q4 provide a brief description of the following:
(a) Semaphore (b) Priority Scheduling (c) Multitasking

Q5. How is memory management supported by swapping? What variations are given by 1st fit, next fit
and best fit memory allocation methods? What is the advantage of Compaction?

Q6. provide distinctions between:
(a) Paging and Segmentation
(b) Sequential and concurrent processes.

Q7. (a) discuss the function of file allocation table with the help of a suitable example.
(b) What is the advantage of using a disk scheduling algorithm?

Q8. (a) How do deadlocks occur and how can they be handled?
(b) Write any 4 distinguishing features of UNIX O.S. and discuss.

Earning:   Approval pending.