Code No: 871AD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
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R20
MCA I Semester Examinations, July/August - 2021
OPERATING SYSTEMS
Time: 3 Hours Max.Marks:75
Answer any five questions
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All questions carry equal marks
1. a) Write in detail on time shared and real-time operating systems.
2. a) What is Operating system? Explain various services of operating system. [7+8]
3. a) What is CPU scheduling? Describe the difference among the short term scheduler, Medium term scheduler and Long term scheduler.
4. a) What is thread? Explain about user-level and kernel level threads. [7+8]
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5. a) What is the difference between the processes and thread ?Explain about process and process control block.
6. a) What is dead lock? Explain about the dead lock prevention conditions. [7+8]
7. a) What is process Synchronization and critical section? Explain the Peterson solution on critical section problems. [15]
8. a) What is semaphore? How it is used in solving the critical section problems? [15]
9. a) Consider the following page reference ‘string 7,0,1,2,0,3,0,4,2,3,0,3,2,1,2,0,1,7,0,1 How many page faults would occur for the following replacement algorithm assuming three frames?
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b) FIFO replacement b) Optimal replacement. [8+7]
10. a) What is Virtual memory? Explain the demand paging and its performance.
11. a) Write detail on file allocation methods. [7+8]
12. a) Discuss about File system structure.
13. a) Explain about Iseek, stat and ioctl system calls. [7+8]
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