Total No. of Questions 18] [Total No. of Pages 02
M.Sc. DEGREE EXAMINATION, MAY 2017
First Year
INFORMATION TECHNOLOGY
Operating Systems
Time 3 Hours Maximum Marks: 70
SECTION A
Answer Any three questions × 15 45)
Q1) Give the detail description of the system structure of modern operating system.
Q2) Consider the following five processes, with the length of the CPU burst time
given in milliseconds.
Process P1 P2 P3 P4 P5
Burst Time 10 1 2 1 5
Priority 3 1 5 4 2
Draw four Gantt charts illustrating the execution of these processes using
FCFS, a non-preemptive priority smaller priority number implies a higher
priority), and RR (quantum scheduling.
Q3) What is deadlock detection and recovery? Describe the method for recovering
from deadlock.
Q4) Explain in detail about paging and segmentation.
Q5) Write about disk management and swap-space management in detail

SECTION B
Answer Any five questions ×
Q6) Write about time sharing and batch systems.
Q7) What is use of system call? Describe various types of system calls.
Q8) What is thread? Describe different thread models.
Q9) Briefly explain about External and internal Fragmentation?
Q10) Write note on protection strategies provided for files.
Q11) What is demand paging and what is its use?
Q12) What is a file? List the various file attributes.
Q13) Describe various program threats in operating systems.
SECTION C
Answer all questions × 1
Q14) Define spooling.
Q15) Define Critical section.
Q16) What is meant by mutual exclusion?
Q17) What are overlays?
Q18) Define worm and virus.