Operating System 2018 – BSc Computer Science Part 2 (MJPRU)

Paper code: 13513
1513
B.Sc. (Computer Science) (Part 2)
Examination, 2018
Paper No. 2.1
OPERATING SYSTEM

Time: Three Hours] [Maximum Marks: 33

 

Note: Attempt five questions in all. Attempt one question from each unit.

Unit-I

1. (a) What are the services provided by the operating system ? Describe each of them in brief.

    (b) What is file ? Describe allocation methods of a file.

2. (a) There is a total memory of 64M in the system, and the total memory is equally divided in 8 parts of 8M each. The request process are 1M, 2M, 3M, 4M, 5m< 6M, 7M, 9M. Calculate :

         (i) Internal Fragmentation

        (ii) External Fragmentation

    (b) Explain the following :

         (i) Real-Time System

         (ii) Multitasking

         (iii) Distributed System

Unit-II

3. Describe page replacement algorithm. Find out total no. of page fault in the sequence with :

    (a) FIFO

    (b) LRU

    (c) Optimal

< 7, 0, 1, 2, 3, 4, 7, 0, 1, 2, 3, 4, 5, 7, 0, 1, 2, 3, 4, 5, 6 >

4. What is Segmentation ? Describe fragmentation with diagram and also define internal and external fragmentation.

Unit-III

5. Current situation of system is :

Process	Allocation	Max	Available
	A    B    C	A     B     C	A     B     C
P0	7     0     0	8     0     1	7     0     3
P1	2     0     0	3     0    2
P2	0     0     3	2     2     0
P3	5     4     3	4     4     4

Find out :

(a) Need table

(b) Safe-Sequence and Intermediate Process request for process P3 (0, 2, 2).

6. What is CPU Scheduling ? Explain in brief with suitable example and diagrams.

Unit-IV

7. (a) What is PCB ? Explain its working.

    (b) Explain Memory Management Schemes in brief.

8. (a) What is Deadlock ? What are the prevention schemes of deadlock ?

    (b) Explain in brief :

         (i) Access Matrix

         (ii) Dynamic Protection Structure

         (iii) Resource Protection Policies

Unit-V

9. (a) What are applications and characteristics of windows NT ? Explain its installation scheme.

    (b) What is standalone server ? Explain its utility.

10. (a) Differentiate PDC and BDC in details with examples.

      (b) Write short notes on any three of the following :

           (i) Dhep

           (ii) Wns

           (iii) Web Server

           (iv) Router

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