Download JNTUH MCA 1st Year R20 2021 July-August 871AD Operating Systems Question Paper

Download JNTUH (Jawaharlal nehru technological university) MCA (Master of Computer Applications) 1st Year (First Year) R20 2021 July-August 871AD Operating Systems Previous Question Paper

R20

Code No: 871AD

2021

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

MCA I Semester Examinations, July/August - 2021

OPERATING SYSTEMS

Time: 3 Hours















Max.Marks:75

Answer any five questions

All questions carry equal marks

- - -


1.a)

Write in detail on time shared and real-time operating systems.

b)

What is Operating system? Explain various services of operating system.

[7+8]


2.a)

What is CPU scheduling? Describe the difference among the short term scheduler,
Medium term scheduler and Long term scheduler.

b)

What is thread? Explain about user-level and kernel level threads.



[7+8]


3.a)

What is the difference between the processes and thread ?Explain about process and
process control block.

b)

What is dead lock? Explain about the dead lock prevention conditions.



[7+8]


4.

What is process Synchronization and critical section? Explain the Peterson solution
on critical section problems.













[15]


5.

What is semaphore? How it is used in solving the critical section problems?

[15]


6.

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?
a) FIFO replacement

b) Optimal replacement.







[8+7]


7.a)

What is Virtual memory? Explain the demand paging and its performance.

b)

Write detail on file allocation methods.











[7+8]


8.a)

Discuss about File system structure.

b)

Explain about lseek, stat and ioctl system calls.









[7+8]



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