| OPERATING SYSTEM |
| PAPER NO. 3 |
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| CS-202 OPERATING SYSTEM (B.Tech 4th Semester,2052) Time : 3 Hours Maximum Marks : 60 NOTE:- This paper consist of Three Sections. Section A is compulsory. Do any Four questions from Section B and any two questions from Section C Section-A Marks : 20 1(a) What is kernal ? (b) What is thew purpose of system programs ? (c) Define Thread. (d) What is the purpose of system calls ? (e) What is meant by address binding ? (f)Explain the following allocation algorithims : (i) First-fit (ii) Best-fit (iii) Worst-fit (g) What is inverted page table ? (h) Explain the concept of stable storage. (i) What is thew need-to-know principle ? Why is it important for a protection system to adhere to this principle ? (j) Explain the term trap door as concerns program threats. Section-B Marks:5 Each 2. What are the five major activities of an operating system in regard to file management ? 3. Describe the difference among short-term, medium term and long term scheduling. 4. Define the difference between Preemptive and Non-preemptive scheduling. State why strict non-preemptive scheduling is unlikely to be used in a computer centre. 5. Consider the following snapshot of a system: Allocation Max Available A B C D A B C D A B C D P0 0 0 1 2 0 0 1 2 1 5 2 0 P1 1 0 0 0 1 7 5 0 P2 1 3 5 4 2 3 5 6 P3 0 6 3 2 0 6 5 2 P4 0 0 1 4 0 6 5 6 Answer the following questions using the banker's algorithm" What is the content of the matrix Need ? Is the system in a safe state ? If a request from process P1 arrives for (0, 4, 2, 0) can the request be granted immediately ? 6. What is the multilevel paging ? Why is it required ? Section-C Marks : 10 Each 7.(a) State and explain four necessary conditions for a deadlock to occur. (b) Explain resourse allocation graph. 8.(a) Explain the concept of virtual memory with its advantages. (b) When do page fault occur ? Describe the actions taken by the operating system when a page fault occurs. 9.(a) Comment upon the socket mechanism in Unix OS. (b) Discuss the important security features provided by most OS. |
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