DISTANCE EDUCATION
M.C.A./M.C.A. (Lateral) DEGREE EXAMINATION,
MAY 2018.
Third Semester
OPERATING SYSTEMS
(2005 to 2010 Calendar Year)
Time Three hours Maximum 100 marks
Answer any FIVE questions.
All questions carry equal marks.
x 20 100)
1. Explain about the desirable characteristics of
operating system.
Discuss about the structure of operating system
with neat sketch.
2. What is a process? Explain about race conditions in
process management.
Compare and contrast priority scheduling with
round robin scheduling.
3. Give the various activities of device controllers in
detail.
Mention and explain the various goals of I/O
software.
Sub. Code
32
DE-3851
2
sp4
4. What is a deadlock? Explain the principles and
conditions for deadlock.
What are the functions of Interrupt handlers?
Explain.
5. Compare and contrast paging with segmentation.

Explain about multiprogramming with fixed
partitions.
6. Give a detailed note on memory management with
bit-maps.
What is a buddy system? Explain.
7. Explain any two page replacement algorithms with
an example.
What is a file? Explain the different access methods
for files.
8. Explain the role of cryptography in security.
Explain about the various protection mechanisms in
file management.