Tuesday, December 8, 2015
Total No. of Questions : 13]
B.Sc.(IT) (Semester -1st)
OPERATING SYSTEM (B.Sc .(IT) -103)
(DCA – 204 (B.Sc.(IT) -302/201) (Semester -2nd &3rd )
Time : 03 Hours Max Marks : 75
Instruction to Candidates :
1) Section –A is Compulsory .
2) Attempt any Nine questions from Section – B.
a) Name hardware features designed to explicitly assist the operating system.
b) What characteristic is common to traps, supervisor calls and subroutine calls but different in interrupts ?
c) What is the principle disadvantage of too much multiprogramming ?
d) In what way is shortest job first scheduling just a particular from of priority scheduling.
e) What is a semaphore ?
f) Is it possible to have a deadlock power for only a single process ?
g) Why the page size are always power of 2 ?
h) What are the two major differences between segmentation and paging ?
i) The second chance algorithm rejects pages that have their reference bit set to one .What happens if all pages have their reference bit set to one ?
j) What is pre- paging ?
k) What is convoy effect ?
l) What is belady `s anomaly problem ?
m) Explain the purpose of the open and closed operations .
n) Why must the bit map for the file allocation be kept on mass storage rather than in main memory ?
o) State three advantages of placing functionality in a device controller rather than in the kernel .
Q2) Show how the Bakery`s algorithm satisfies the requirements of a mechanism to control access to a critical section.
Q3) What is CPU scheduling ? Explain FCFS,SJF and priority Scheduling with their advantage and disadvantages .
Q4) What is scheduler ? Explain different types of schedulers .
Q5) What are the four necessary conditions to occur a deadlock ? How we can prevent from a deadlock ?
Q6) What is difference between fixed partition and variable partition and explain the need of compaction ?
Q7) Explain the following allocation algorithms:
(a) First Fit
(b) Best Fit
(c) Worst Fit
Q8) Explain LRU page replacement algorithm in virtual memory.
Q9) What is thrashing ? What is its cause and how it can be minimized ?
Q10) Explain different access methods in a file system .
Q11) Explain different methods to implement the free space in file system with their advantage and disadvantages ?
Q12) What is DMA ? How does DMA increase system concurrency ?
Q13) What is the difference between process and thread ? Explain kernel level and user level threads .
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