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MCQs Operating System|UGC-NET|GATE|Computer Science

1.If the disk head is located initially at 32, find the number of disk moves required with FCFS if the disk queue of I/O blocks requests are 98, 37, 14, 124, 65, 67.
A.239
B.310
C.321
D.325
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Explanation
2.Which of the following memory allocation scheme suffers from external fragmentation ?
A.Segmentation
B.Pure demand paging
C.Swapping
D.Paging
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3.Consider a system having m resources of the same type. These resources are shared by 3 processes A, B and C which have peak demands of 3, 4 and 6 respectively. For what value of m deadlock will not occur ?
A.7
B.9
C.10
D.13
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4.Pre-emptive scheduling is the strategy of temporarily suspending a running process
A.before the CPU time slice expires
B.to allow starving processes to run
C.when it requests I/O
D.to avoid collision
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5.Resources are allocated to the process on non-sharable basis is
A.mutual exclusion
B.hold and wait
C.no pre-emption
D.circular wait
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6.In round robin CPU scheduling as time quantum is increased the average turn around time
A.increases
B.decreases
C.remains constant
D.varies irregularly
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7.Pool based allocation of memory achieves better usage. Memory can be preempted from inactive programs and used to accommodate active programs. This is called
A.Preemption
B.Swapping
C.Spooling
D.Scheduling
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8.Which of these is an example of a virtual resource?
A.Print server
B.Virtual machine
C.Virtual memory
D.All of the above
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9.Which concept explains the working of an Operating System?
A.It is event driven
B.It is object oriented
C.It is procedure based system software
D.It is a collection of procedures that interact with each other
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10.Which of these is/are the desirable features of an Operating system
A.Extensible
B.Portable
C.Reliable
D.All of the above
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Author Does Not claim of any answer these answers are as per expert opinion


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