Barkatullah University 2010-3rd Sem B.C.A Computer Application (ester) , 2009-10, OPERATING SYSTEM – -304, BRAKATULLAH UNIVERSITY BHOPAL - Question Paper

AS-181
B.C.A. (Third Semester) EXAMINATION, 2009-10
OPERATING SYSTEM
Paper – BCA-304
Time: 3 Hours
Maximum Marks : 35
Note : Attempt all ques.
Section-A 1-each
(Objective kind ques. )
Q.1. select the accurate answer-
(i) -------------- network can link buildings within a city:
a) LAN
b) WAN
c) MAN
d) SAN
(ii) In round robin scheduling , the ready queue is treated as a ---------
a) Closed queue
b) Circular queue
c) Dequeue
d) None
(iii) The address generated by the CPU in the paging scheme is in the form ---------- where ---------- stands for ------------ and -------- stands for ------------ .
(iv) FCB stands for ------------------- .
(v) The most common deadlock avoidance algorithm is ……………..

part –B
Short ans kind ques. two marks every
Q.I. provide a complete definition of operating system.
Or
describe the following:
(a) Real time system
(b) Distributed system
Q.II. Name the 3 kinds of CPU schedulers and provide function of every.
Or
provide the queuing diagram representing process scheduling and show the action point for the various kinds of CPU schedulers.
Q.III. If it takes 20 nanoseconds to search the TLB ( translation look-aside buffer) and 100 nanoseconds to access the memory. How much total time is needed to get the desired page if we fail to obtain the page number in the TLB.
Or
What is re-entrant code? Name a few heavily used programs that can be shared.
Q.IV. describe disk caching and disk mirroring.
Or
What is seek time and rotational latency as related to a hard disk.
Q.V. describe virtual devices, shared devices and dedicated devices.
Or
State the critical part issue.
part –C
Long ans kind ques. four marks every
Q.I. Write a note on the evolution of operating system.
Or
Compare client-server and peer-to-peer system stating their advantages and disadvantages.

Q.II. (i) discuss situation switch along with a suitable diagram. two
(ii) Name and briefly describe the scheduling criteria. 2
Or
(i) List out the circumstances under which a CPU scheduling decision may have to be taken by the CPU scheduler. 2
(ii) Assume, we have the workload as shown beneath. All five processes arrive at time 0, in the order provided. The length of the CPU burst time is provided in milliseconds
Process : P1 P2 P3 P4 P5
Burst time: 10 29 three seven 12
Considering the FCFS , SJF and RR (q=10ms) scheduling algorithms, which algorithm would provide the minimum avg. turn around time. 2
Q.III (i) Do real time systems have virtual memory. 1
(ii) List out the advantages and disadvantages of having a big page size. 3
Or
discuss in detail how a page fault is serviced under the virtual memory management schemes.
Support your ans with improper diagram.
Q.IV. Write in detail about disk driver and disk controller.
Or
Enumerate the responsibilities of a file management system.
Q.V. (i) describe a deadlock. 1
(ii) Name and discuss the 4 necessary conditions for a deadlock to occur. 3
Or
(i) Name the 3 items on which user authentication is mainly based. Elaborates on the different method of user authentication. 2
(ii) Name the 4 level at which security measures must be implemented for full protection of a system. discuss every in brief. 2

Earning:   Approval pending.