# Operating system mcqs virtual memory thrashing

## Operating system mcqs virtual memory thrashing

 Question 1 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Consider the following page reference string. 1 2 3 4 2 1 5 6 2 1 2 3 7 6 3 2 1 2 3 6 For FIFO page replacement algorithms with 4 frames, the number of page faults is?
 A 16 B 15 C 14 D 11
 Question 2 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Consider the following page reference string. 1 2 3 4 2 1 5 6 2 1 2 3 7 6 3 2 1 2 3 6 For LRU page replacement algorithm with 4 frames, the number of page faults is?
 A 10 B 14 C 8 D 11
 Question 3 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Consider the following page reference string. 1 2 3 4 2 1 5 6 2 1 2 3 7 6 3 2 1 2 3 6 For FIFO page replacement algorithms with 3 frames, the number of page faults is?
 A 16 B 15 C 14 D 11
 Question 4 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In the working set model, for: 2 6 1 5 7 7 7 7 5 1 6 2 3 4 1 2 3 4 4 4 3 4 3 4 4 4 1 3 2 3 if DELTA = 10, then the working set at time t1 (....7 5 1) is?
 A {1, 2, 4, 5, 6} B {2, 1, 6, 7, 3} C {1, 6, 5, 7, 2} D {1, 2, 3, 4, 5}
 Question 5 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Consider the following page reference string. 1 2 3 4 2 1 5 6 2 1 2 3 7 6 3 2 1 2 3 6 For Optimal page replacement algorithms with 3 frames, the number of page faults is?
 A 16 B 15 C 14 D 11
There are 5 questions to complete.