Punjab Technical University 2006-1st Sem B.Sc Information Technology -IT OPERATING SYSTEM - Question Paper

BSIT (05)-103
OPERATING SYSTEM
BSC (IT) Ist Semester (2096)

Time: three Hours Max Marks:75

Note: Part A is compulsory and have 15 short ans ques. of two marks every. Part B is consists of 12 long ans ques. of five marks each,out of which you have to attempt 9 ques..


Part A (15x2=30)

Short ans ques.
1. Explain PCB.
2. What is Kernal thread?
3. What do you mean by virtual machines?
4. What are direct and indirect communications?
5. Explain interface design?
6. What is the difference ranging from a trap and interrupt? What is the use of every function?
7. Explain the difference ranging from internal and external fragmentation.
8. What do you mean by critical part problem?
9. Explain sleeping barber issue.
10. How will you avoid deadlocks?
11. What are the difference in writing an OS for a real time environment?
12. What is Fat 32?
13. What do you mean by single level and 2 level structures?
14. What do you mean by Hierarchical structure?
15. Explain Kernal I/O subsystem.


Section B
1. Compare and contrast the techniques of catching disk blocks locally , on a client system and remotely , on a server.
2. Describe the Monolithic and Layered Architecture.
3. The Definition of Operating system “ It si the software that controls the Hardware” is not adequate. explain.
4. Explain various kinds of CPU scheduling in details.
5. Explain Semaphores and Synchronization issues.
6. Give 3 (3) page frames use algorithm

(a)LRU (b) OPT to calculate the number of page faults for the
following reference string:
F A B C A D A E C D A D C B C A B F A B
7. What do you mean by Deadlock detection and recovery?
8. Define and discuss the subsequent

(a) Concurrent Processing
(b) Segmentation with paging

9. What is demand paging?
10. Explain the function of DMA in details.
11. Explain I/O Hardware , polling and Interrupts.
12. Define and discuss the following:

(a) Inverted Page Tables
(b) Thrashing

Earning:   Approval pending.