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

51.Throughput of a multiprogramming OS that processes n programs over th eperiod of time that starts t0 and ends at tf is
A.(tf-t0)/n
B.tf*n/t0
C.n/(tf-t0)
D.n*tf*t0
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52.Which of these are the reasons for CPU-bound programs having higher priority than the I/O bound programs
A.CPU utilization is better in CPU-bound programs
B.I/O bound programs do not get an opportunity to be executed
C.Period of concurrent CPU and I/O bound activities is rare.
D.All of the above
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53.Which of these is incorrect in context of Real Time Operating System?
A.Permits creation of multiple processes within an application.
B.Permits priorities to be assigned to the processes.
C.Doesn't allow programmer to define interrupts and interrupt processing routines
D.Provides fault tolerance and graceful degradation capabilities.
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54.Which of these is not a goal of Scheduling Algorithm for Different Operating Systems
A.Fairness
B.balance
C.maximize throughput
D.Policy enforcement
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55.Which of these is a disadvantage of first Come First Serve?
A.Convoy Effect
B.Small average and worst-case waiting times
C.Simplicity
D.non-preemptive
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56.What is the duration of a time quantum in Round-Robin Scheduling?
A.10-100 millisec
B.10-100 nanosec
C.100-1000 millisec
D.100-1000 nanosec
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57.As a rule of thumb what percentage of the CPU bursts should be shorter than the time quantum?
A.80%
B.70%
C.60%
D.50%
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58.Interval between the time since submission of the job to the time its results become available, is called
A.Response Time
B.Throughput
C.Waiting time
D.Turnaround Time
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59.A scheduler which selects processes from Primary memory is called
A.Long Term Scheduler
B.Medium Term Scheduler
C.Short Term Scheduler
D.Job Scheduler
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60.The scheduling in which CPU is allocated to the process with least CPU-burst time is called
A.Priority Scheduling
B.Round Robin Scheduling
C.Multilevel Queue Scheduling
D.Shortest job first Scheduling
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Author Does Not claim of any answer these answers are as per expert opinion


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