(6 pages) Reg. No. : ..........................................
Code No. : 30383 E Sub. Code : JMCS 61/
JMSE 61/SMCS 61
B.Sc. (CBCS) DEGREE EXAMINATION,
APRIL 2020.
Sixth Semester
Computer Science/Software Engineering – Main
OPERATING SYSTEM
(For those who joined in July 2016 onwards)
Time : Three hours Maximum : 75 marks
PART A — (10 1 = 10 marks)
Answer ALL the questions.
Choose the correct answer :
1. Submission of subsequent task for processing to
the time its result becomes available —————.
(a) Throughput (b) Response time
(c) Turnaround time (d) Service time
2. SVC refers to —————.
(a) system viable call
(b) system visible call
(c) serial visible call
(d) supervisory call
3. For waiting state, a process can only enter into
—————.
(a) running state (b) ready state
(c) new state (d) terminated state
4. An application process can create ————— to
execute.
(a) One thread (b) Two threads
(c) Three threads (d) Many threads
5. A semaphore that does not specify the order in
which processes are removed from the queue is a
—————.
(a) strong semaphore
(b) weak semaphore
(c) binary semaphore
(d) general semaphore
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6. Safe state is one where —————.
(a) it is deadlock
(b) it is not a deadlocked state
(c) it is deadlock avoidance
(d) it is process and resource
7. The page replacement policy which uses the
principle of locality of reference for its replacement
decision —————.
(a) FIFO (b) Optimal
(c) LRU (d) Clock
8. Memory compaction is used to eliminate
—————.
(a) external fragmentation
(b) page fault
(c) swapping
(d) none of these
9. The physical order of a record in a file, as
determined by the access method, is known as
—————.
(a) file management system
(b) file organization
(c) file allocation table
(d) file structure
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10. A record contain —————.
(a) single data (b) multiple data
(c) related fields (d) logical flags
PART B — (5 × 5 = 25 marks)
Answer ALL questions, choosing either (a) or (b).
Each answer should not exceed 250 words.
11. (a) Write and discuss about Operating System
generation.
Or
(b) Discuss about system calls.
12. (a) What is meant by IPC? Explain.
Or
(b) Discuss about multi process scheduling.
13. (a) How the deadlock is prevented? Explain.
Or
(b) Discuss about Peterson’s solution for critical
section problem.
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[P.T.O.]
14. (a) Explain swapping method in memory
management.
Or
(b) Explain any one paging algorithm.
15. (a) Discuss about file system structure.
Or
(b) Write about directory implementation.
PART C — (5 8 = 40 marks)
Answer ALL questions, choosing either (a) or (b).
Each answer should not exceed 600 words.
16. (a) What is a function Operating System?
Or
(b) Write in details about Operating System
design and implementation.
17. (a) Write about the concept Operating System
scheduling criteria.
Or
(b) What is thread? Write about thread
scheduling.
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18. (a) Write and explain dead avoidance method.
Or
(b) Explain the following :
(i) Critical section problem
(ii) Semaphores.
19. (a) Discuss about virtual memory with example.
Or
(b) Write about :
(i) Frames
(ii) Threading.
20. (a) Explain file allocation method.
Or
(b) Write about file sharing and protection.
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