OSG202 Trial Test Key Questions And Answers With
Verified Solutions
Which keyword is appropriate described in the following statement: "While memory sizes are
increasing rapidly, software sizes are increasing much faster"?
A. bloatware
B. swapping
C. paging
D. overlays ANS A
What is the advantage of the exokernel scheme?
A. Save a layer of mapping
B. Maintain tables to remap disk address
C. Try to use somebody else's resource
D. All of the others ANS A
How many ways are Thread implemented?
A. 1
B. 2
C. 3
D. 4 ANS B
Which problem is described two following statements?
1. No reader will be kept waiting unless a writer has already obtained permission to use the shared
object. Or, readers have higher priorities;
2. Once a writer is ready, the writer performs its write as soon as possible
A. Readers-Writers
B. All of the others
C. Bankers
D. Producer-Consumer ANS A
,Which operating system structure is communication between requesting process and responding
process by message passing?
A. Monolithic Systems
B. MS - DOS
C. All of the others
D. Client - Server Model ANS D
A disk queue with requests for I/O blocks on cylinders in orders: 10, 22, 20, 2, 40, 6, 38. Assume that
the disk head is initially at cylinder 9. How many cylinder do Total head movement using SSF
algorithms?
A. 45
B. 47
C. None of the others
D. 69 ANS B
Each process is associated with _________
A. all of the others
B. address space, set of resources, registers, etc
C. address memory, linker, compiler, etc
D. address space, set of program's source files, pointer, etc ANS B
A memory free in 3 frames. Which values do the page frame contain after the 4th page is accessed?
Assume that the running as the following page 7, 0 , 1, 2 , 0, 3, 0 , 4, 2 , 3 , 0 , 3 , 2 , 1, 2, 0, 1, 0 , 7
using LRU
A. 4, 0, 3
B. 3, 0, 4
C. 1, 0, 7
D. 7, 0, 1 ANS A
,A system has five processes and three allocated resources. The current allocation and request needs
are as following figure. What do the processes progress in sequence?
Process | Allocated | Currently Request | Available
A _________| _____010____ | __________000 __________| ____100
B _________| _____200___ | ___________202___________|
C _________| ____300 ___| ___________001___________|
D_________ |____ 211 _____|____________ 100__________|
E__________ |___ 022____ | ___________002__________|
A. ABCDE
B. ADECB
C. ADCEB
D. ACDEB ANS C
One of way to prevent a deadlock is ________
A. Locks one of the processes
B. Kills one of the processes
C. Spool everything
D. Rollback ANS C
Five batch jobs A through E, arrive at a computer center at almost the same time. They have
estimated running times of 8, 6, 2, 10, and 4 minutes and arrival times at 0, 4, 6, 10 and 12.
Determine the mean process 'average turnaround time' for FCFS (First-Come First Served)
scheduling. Ignore process switching overhead.
A. 6,4 minutes
B. 12,4 minutes
C. 62 minutes
D. 32 minutes ANS B
, Working set model is used for:
A. All of the other choices
B. Finding the minimum number of frames necessary for a job so that jobs can be run without
"thrashing"
C. Finding the average number of frames a job will need to run smoothly
D. Determining whether page replacement is needed ANS B
Which of the following is not correct about hard links and symbolic links?
A. Symbolic links need space to store the name of the file pointed to
B. Hard links can point to files on other machines
C. Hard links do not require extra disk space
D. Symbolic links can point to files in the network ANS B
Which of the following statements about segmentation is false?
A. Sharing of procedures between different users can be facilitated
B. The total address space can be more than the size of physical memory
C. There are several linear address spaces
D. None of the other choices ANS D
What are the allocation methods of disk blocks for files:
A. All of the other choices
B. Linked allocation
C. Contiguous allocation
D. Indexed allocation ANS A
Assume that the Page Table below is in effect. The number of lines per page is 400. The actual
memory location for line 433 is ____.
