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Total No. of Pages : 02
(Sem.-3)
Roll No.
Total No. of Questions : 07
B.Sc. (IT) (2015 & Onwards)
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OPERATING SYSTEMS
Subject Code : BSIT-303
M.Code : 74061
Time: 3 Hrs.
Max. Marks : 60
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INSTRUCTIONS TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains SIX questions carrying TEN marks each and students have to attempt any FOUR questions.
SECTION-A
Q1. Answer briefly :
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- Define the terms: Multiprogramming and Multithreading.
- Differentiate between a short term scheduler and a long term scheduler.
- Differentiate between Logical and Physical address space.
- What are program threats?
- Define the term Pipe and FIFO.
- What do you understand by thrashing and its solution?
- Define the term file. List various attributes of a file.
- Discuss the need of virtual memory.
- What is the difference between seek time and rotational latency time?
- What do you mean by memory reference string?
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SECTION-B
Q2. What do you mean by CPU scheduling? What are the criteria of selecting scheduling algorithms? Explain with example the Shortest Job First (SJF) scheduling and Round robin scheduling algorithm.
Q3. What do you mean by page-faults? When do page-faults occur? Describe the action taken by the O.S when page fault occurs.
Q4. Discuss various methods of file allocation with advantages and disadvantages.
Q5 Explain the various disk-scheduling algorithms in brief. Find out number of head movements for FCFS, SCAN, LOOK scheduling algorithm for a queue from 0-199 and current head pointer is at 53, 98, 183, 37, 122, 14, 124, 65, 67.
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Q6. Explain the following terms with one example of each :
- Multiprogramming
- Multiprocessing
- Time sharing
- Real time operating systems
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Q7. Explain different security techniques with their advantages and disadvantages.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.
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