Welcome to Operating System Quiz, Advanced Level !!

Question 1. If all page frames are initially empty, and a process is allocated 3 page frames in real memory and references its pages in the order 1 2 3 2 4 5 2 3 2 4 1 and the page replacement is FIFO, the total number of page faults caused by the process will be ?

10

7

8

9

Question 2. Consider the two statements.
(A) A network operating system, the users access remote resources in the same manner as local resource.
(B) In a distributed operating system, the user can access remote resources either by logging into the appropriate remote machine or transferring data from the remote machine to their own machine.
Which of the statement is true?

A true, B false

B true, A false

Both A and B false

Both A and B true

Question 3. In Priority Scheduling a priority number (integer) is associated with each process. The CPU is allocated to the process with the highest priority (smallest integer = highest priority). The problem of, Starvation ? low priority processes may never execute, is resolved by ?

Terminating the process.

Aging

Mutual Exclusion

Semaphore

Question 4. The degree of Multiprogramming is controlled by

CPU Scheduler

Context Switching

Long-term Scheduler

Medium term Scheduler

Question 5. _________ allocates the largest hole (free fragment) available in the memory.

best fit

worst fit

first fit

none of the above

Question 6. Consider Peterson?s algorithm for mutual exclusion between two concurrent processes i and j. The program executed by process is shown below
      repeat
          flag [i] = true;
          turn = j;
          while ( P ) do no-op;
          Enter critical section, perform actions, then exit critical section
      flag [ i ] = false;
      Perform other non-critical section actions
     until false;

For the program to guarantee mutual exclusion, the predicate P in the while loop should be

flag [j] = true and turn = i

flag [j] = true and turn = j

flag [i] = true and turn = j

flag [i] = true and turn = i

Question 7. In one of the deadlock prevention methods, impose a total ordering of all resource types, and require that each process requests resources in an increasing order of enumeration. This violates which condition of deadlock

Mutual exclusion

Hold and Wait

Circular Wait

no preemption

Question 8. Consider a machine with 64 MB physical memory and a 32-bit virtual address space. If the page size is 4KB, what is the approximate size of the page table?

16 MB

8 MB

2 MB

24 MB

Question 9. _________ is a high speed cache used to hold recently referenced page table entries a part of paged virtual memory

Translation Lookaside buffer

Inverse page table

Segmented page table

all of the above

Question 10. _________ page replacement alogorithm suffers from Belady's anamoly.

LRU

MRU

FIFO

LIFO