Punjab Technical University 2009-4th Sem B.Tech Computer Science and Engineering (th) OPERATING SYSTEM ( ) Re-appear SUBJECT CODE, : CS-2O2 - Question Paper

Roll No.
Total No. of ques. : [09] [Total No. of Pages : 02]


B.Tech. (Sem-4th)
OPERATING SYSTEM
SUBJECT CODE : CS-2O2
Paper ID : [AO458]
[Note : Please fill subject code and paper ID on OMR]


Time : 03 Hours Maximum Marks : 60

Instruction to Candidates:
1) part - A is Compulsory.
2) Attempt any 4 ques. from Section- B.
3) Attempt any 2 ques. from Section- C

Section - A (10x2=20)
Q1) a) What is virtual memory?
b) describe preemptive and non-preemptive scheduling.
c) describe critical part.
d) What is deadlock?
e) elaborate the various objectives for the operating system to decide scheduling?
f) Differentiate ranging from a page and a frame.
g) Differentiate ranging from program and process.
h) Differentiate ranging from protection and security.
i) What is a Process Control Block?
j) elaborate semaphores?

Section-B (4x5=20)
Q2) What is Operating System? explain different classification of operating system.
Q3) What do you mean by page-faults?When do page-fault occurs?Describe the action taken by the O.S when page fault occurs
Q4) What is fragmentation? discuss the difference ranging from internal fragmentation and external fragmentation.
Q5) What is CPU scheduling?What is its need?List different scheduling algorithms.
Q6) elaborate distributed and non distributed operating systems

Section - C (2x10=20)
Q7) What is deadlock? List and discuss 4 necessary conditions for deadlock to occur? discuss various algorithms for prevention and avoidance of
deadlocks.
Q8) Compare and contrast Public - key cryptography technique with.Conventional cryptography technique.
Q9) (a) What is paging? discuss various paging techniques.
(b) discuss the concept of segmentation taking suitable examples

Earning:   Approval pending.