B.Sc. (Computer Science) Sem 3 Principles of Operating Systems Oct 2022 Question Paper - Mumbai University | munotes

Questions asked in this paper

• 2) Figures to the right indicate marks

1. Q1 Attempt the following (Any four) (20M)
   • (a) What is Thread? Explain various multithreading models
   • (b) Write a note on real time operating system
   • (c) Write different services provided by operating system
   • (d) Explain Interprocess communication
   • (e) What are the different states of process? Explain it
   • (f) Explain CPU Scheduling criteria
2. Q2 Attempt the following (Any four) (20M)
   • (a) What is Deadlock? Explain deadlock conditions
   • (b) What is semaphore? Explain types of semaphore
   • (c) Consider the processes which are given below in the table having arrival time is 0 and burst time is given .Calculate avg waiting time for SJF SCHEDULING
   • (d) Explain deadlock prevention
   • (e) Considering a system with five processes Po through P4 and three resources of type A, B, C. Resource type A has 10 instances, B has 5 instances and type C has 7 instances, Suppose at time to following snapshot of the system has been taken: What will be the content of the Need matrix? Is the system in a safe state? If Yes, then what is the safe sequence?
   • (f) Explain RR scheduling algorithm with example VCD/ SYCS SEM-III PRINCIPLES OF OPERATING SYSTEM 75M
3. Q3 Attempt the following (Any four) (20M)
   • (a) What is Virtual Memory? Explain in brief
   • (b) Write short notes on:
4. Q1 paging 2) Interrupt
   • (c) Consider page reference string 1, 3, 0, 3, 5, 6, 3 with 3 page frames Find the number of page faults using FIFO
   • (d) Explain different file operations
   • (e) Explain in detail multilevel queue scheduling
   • (f) Explain FCFS disc scheduling with example
5. Q4 Attempt the following (Any five) (15M)
   • (a) What is Operating system? Explain function of operating system
   • (b) Write a short note on multicore programming?
   • (c) Describe directory structure.(any two)
   • (d) Write short note on 1.MMU 2.PAGE TABLE
   • (e) Explain Thrashing
   • (f) Write a note on DMA

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