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PUNJAB TECHNICAL UNIVERSITY MCA - II (SEM 4) MAY 2008 : Operating Systems

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Roll No. .......................... Total No. of Questions : 13] [Total No. of Pages : 02 Paper ID [A0519] (Please fill this Paper ID in OMR Sheet) MCA (404) (S05) (O) (Sem. - 4th) OPERATING SYSTEMS Time : 03 Hours Maximum Marks : 75 Instruction to Candidates: 1) 2) Section - A is Compulsory. Attempt any Nine questions from Section - B. Section - A Q1) (15 2 = 30) a) What is multiprocessing? b) Describe two different techniques for handling the communications between a processor and devices. c) What is the essential difference between a block special file and a character special file? d) What is device independence? e) What is the difference between a physical address and a virtual address? f) What is a semaphore? g) What is the process of segmentation? h) What is an acrylic graph? i) What do you mean by thrashing? j) What are conditions for a deadlock to exist? k) What is Belady s anomaly? l) What is a remote procedure call? m) Describe conditions under which a kernel may perform dispatching without performing scheduling. n) What is the importance of disk scheduling? o) How does salting improve password security? D - 699 P.T.O. Section - B (9 5 = 45) Q2) Define, Compare and Contrast between online, real time, interactive computing and time sharing computing. Q3) How has distributed computing affected the operating system design? Q4) Why main memory is called random access memory? Compare main memory to disk in terms of access time, capacity and volatility. Q5) What is meant by spooling? How does caching improves system performance? Q6) What is Direct Memory Access? How DMA improves system performance and cycle stealing. Q7) What is an interrupt? What does it means for an interrupt to be synchronous? Q8) What is inter-process communication? What is the major drawback of using signals for IPC? Q9) What is mutual exclusion? Discuss Dekker s Algorithm for mutual exclusion. Q10) What is processor scheduling? Discuss the Shortest Process First Scheduling with the help of suitable examples. Q11) What is the concept of deadlock? How to prevent Deadlock. Illustrate with the help of examples? Q12) What is demand paging? Discuss its advantages and disadvantage. Q13) Can the Trojan horse attack work in a system protected by capabilities? What is the difference between a virus and a worm? How do they each reproduce? xxxx D - 699 2

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Additional Info : Mca - II (sem 4) May 2008 Question Paper - Operating Systems
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