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

1.State an undesirable characteristic of each of the following criteria for measuring performance of an operating System
A.Turn around time
B.Waiting time
C.All of the Above
D.None of Above
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2.Which of the following is an example of a spooled device ?
A.The terminal used to input data for a program being executed.
B.The Secondary memory device in a virtual memory system.
C.A line printer used to print the output of a number of Jobs.
D.None of the Above.
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3.Which scheduling policy is most suitable for time shared operating systems?
A.Shortest Job First
B.Round Robin
C.First come First Serve
D.Elevator
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4.Which of the following is an example of Spooled device ?
A.A line printer used to print the output of a number of Jobs.
B.A terminal used to enter input data to a running program.
C.A secondary storage device in a virtual memory system.
D.A graphic display device.
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5.Four Jobs to be executed on a single processor system arrive at time 0 in the order A,B, C,D. Their burst CPU time requirements are 4,1,8,1 time units, respectively. The completion time of A under round robin scheduling with time slice of one time unit is
A.10
B.4
C.8
D.9
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6.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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7.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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8.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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9.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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10.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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Author Does Not claim of any answer these answers are as per expert opinion


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