Tiêu đề 3140702 - OS 2021S.pdf ✅

1 Seat No.: ________ Enrolment No.___________ GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER–IV (NEW) EXAMINATION – SUMMER 2021 Subject Code:3140702 Date:03/09/2021 Subject Name:Operating System Time:02:30 PM TO 05:00 PM Total Marks: 70 Instructions: 1. Attempt all questions. 2. Make suitable assumptions wherever necessary. 3. Figures to the right indicate full marks. 4. Simple and non-programmable scientific calculators are allowed. Q.1 (a) Define the essential properties of the following types of operating systems: (1) Batch (2) Time-sharing (3) Real-time 03 (b) What are the advantages of multiprogramming? 04 (c) What is the thread? What are the difference between user-level threads and kernel- supported threads? Under what circumstances is one type “better” than the other? 07 Q.2 (a) What is Process? Give the difference between a process and a program. 03 (b) What is Process State? Explain different states of a process with various queues generated at each stage. 04 (c) Write a bounded-buffer monitor in which the buffers (portions) are embedded within the monitor itself. 07 OR (c) What is Semaphore? Give the implementation of Readers-Writers Problem using Semaphore. 07 Q.3 (a) Define the difference between preemptive and nonpreemptive scheduling. 03 (b) What are the Allocation Methods of a Disk Space? 04 (c) What is deadlock? Explain deadlock prevention in detail. 07 OR Q.3 (a) What are the disadvantages of FCFS scheduling algorithm as compared to shortest job first (SJF) scheduling? 03 (b) Distinguish between CPU bounded, I/O bounded processes. 04 (c) What is deadlock? Explain deadlock Avoidance in detail. 07 Q.4 (a) What is Access control? 03 (b) What are Pages and Frames? What is the basic method of Segmentation? 04 (c) Briefly explain and compare, fixed and dynamic memory partitioning schemes. 07 OR Q.4 (a) Explain difference between Security and Protection? 03 (b) Differentiate external fragmentation with internal fragmentation. 04 (c) Explain the best fit, first fit and worst fit algorithm. 07 Q.5 (a) Explain the concept of virtual machines. 03 (b) Compare virtual machine and non virtual machine. 04 (c) What is “inode”? Explain File and Directory Management of Unix Operating System. 07 OR Q.5 (a) What is marshalling and unmarshalling? 03 (b) What are components of Linux systems? 04 (c) Explain Disk arm scheduling algorithm. 07 *************