Wednesday, March 25, 2020

Operating System Notes | 100% Easy Short Notes | ALLBCA


Operating System Notes : ALLBCA

Here, allbca provide you very-very important topics of Operating System Notes, for your Sem 4th exam preparation and to increase your knowledge. We are 100% sure, that it will pass you in the Operating System  Exam. And you will have very good marks. Section 'C' contains 15 marks, Section 'B'  7.1/2 marks and Section 'A' 3 marks'Stars' represents the possibility of that particular question arrive in the exam. So read them all carefully.

Section 'C' (15 marks) : Operating System Notes

Q1. “Deadlock”? Diff. methods for prevention and avoidance of deadlock?
(Explain for necessary conditions for deadlock to occur with example)

Ans. (click here) ★★★★★★★

Q2. Consider following ‘Page reference strings 1,2,3…… How many “Page Fault” could occur for following replacement algorithms, assuming four frames. (it is Numerical)
(a) LRU replacement ?
Ans(a). (click here) ★★★
(b) Optimal replacement ?
Ans(b). (click here) ★★★
(c) FIFO replacement ?
Ans(c). (click here) ★

Q3. 'Linked Allocation' methods for files? (merits & drawbacks)
(How does an indexed allocation salve problems of linked allocation scheme)

Ans. (click here) ★★★

Q4. “Process Scheduling Algorithm”
(Explain performance ‘criteria’ for ‘scheduling algorithm’)
(a) First Come First Serve ?
(b) Shortest Job First ?
(c) Priority Scheduling ?
(d) Round Robin ?
Ans. (click here) ★★★

Q5. 'Semaphor' ? How do they implement mutual exclusion ?
Ans. (click here) ★★

Q6. 'Segmentation' ? (memory segmentation)
Ans. (click here) ★★

Q7. (i) 'Directory Structure' with Ex. ?
Ans(i). (click here) ★★
(ii) 'Multi-threading Concept' ?
Ans(ii). (click here)
(iii) 'Free Space Management' with Ex. ?
Ans(iii). (click here)
(iv) 'Thrashing' ? why occur? working set strategy to deal this problem ?
Ans(iv). (click here)

Q8. 'Fragmentation' ? (Internal/External Fragmentation)
Ans. (click here) ★*

Q9. 'Structure of a disk' with diagram?
Ans. (click here) ★*

Q10. ‘The CPU Burst Time’ requirement of five processes P1,P2,P3,P4 and P5 along with their arrival times at ready queue are shown below:-
★★ (Q10 is Numerical) [Ans1] [Ans2]
(i) Preemptive shortest-job-first scheduling.
Ans(i). (click here) / (read)
(ii) Non-preemptive shortest-job-first scheduling.
Ans(ii). (click here) / (read)

Section 'B' (7.1/2 marks)

Q1. How ‘Memory can dynamically allocated’ using ‘first fit’, ‘best fit’, ‘worst fit’ strategies?
Ans. (click here) ★★

Q2. ‘Paging’?
Ans. (click here) ★★

Q3. ‘Critical section problem’? Example?
Ans. (click here)

Q4. ‘Virtual memory’? with diagram?
Ans. (click here) ★

Q5. ‘Virtual devices’? its advantages?
Ans. (click here)

Section 'A' (3 marks)

Q1. ‘Operating System’? Role? (services are provided by an OS)
Ans. (click here) ★★★*

Q2. ‘Time Sharing’ System Vs ‘Real Time’ System.
Ans. (click here) ★★★

Q3. ‘Physical Address’ Vs ‘Logical Address'.
Ans. (click here) ★★★*

Q4. ‘Resource allocation graph’? Example?
Ans. (click here) ★*

Q5. ‘Batch processing’?
Ans. (click here) ★*

Q6. ‘Handling a page fault’ steps involved?
Ans. (click here)

Q7. ‘Device Management’ (its Function)?
Ans. (click here)

Q8. ‘Protection’ and ‘Security’?
Ans. (click here)

[ Topic= Operating System Notes ]

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[ Topic= Operating System Notes ]
[ Topic= Operating System Notes ]

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