Q. Preemptive Shortest Job First scheduling is sometimes called :

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Q. An SJF algorithm is simply a priority algorithm where the priority is :

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Q. One of the disadvantages of the priority scheduling algorithm is that :

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Q. ‘Aging’ is :

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Q. A solution to the problem of indefinite blockage of low – priority processes is :

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Q. Which of the following statements are true ?
i) Shortest remaining time first scheduling may cause starvation
ii) Preemptive scheduling may cause starvation
iii) Round robin is better than FCFS in terns of response time

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Q. Which of the following scheduling algorithms gives minimum average waiting time ?

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Q. Match the following:
List – I - - - - - - - - - - - - - - - - - - - - - - - - - List – II
a. Multilevel feedback queue - - - - - - - - - i. Time-slicing
b. FCFS - - - - - - - - - - - - - - - - - - - - - - - -ii. Criteria to move processes between queues
c. Shortest process next - - - - - - - - - - - -iii. Batch processing
d. Round robin scheduling - - - - - - - - - - -iv. Exponential smoothing

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Q. How you will describe Throughput in operating system?

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Q. Which of the following scheduling policy is well suited for a time shared operating system?

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Q. What is the most suitable scheduling policy for a time - shared operating systems?

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Q. Consider a uniprocessor computer system that has 2 processes and both of them alternate 10ms CPU bursts with 90ms I / O bursts. Both the processes were created at nearly the same time and can proceed in parallel. What is the scheduling strategy for this system that will result in the least CPU utilization (over a long period of time) ?

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Q. We have an operating system, which is capable of loading and executing a single sequential user process at a time. If the disk head scheduling algorithm which is initially First Come First Served (FCFS) is replaced by Shortest Seek Time First (SSTF) claimed by the vendor to give 50% better benchmark results then what is the expected improvement in the I / O performance of the user programs?

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Q. We have a uniprocessor machine where a set of n tasks with known run times r1, r2, r3,….rn are to be run. What will be the maximum throughput result of the processor scheduling algorithm?

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Q. Three CPU intensive processes requires 10, 20 and 30 time units and arrive at times 0, 2 and 6 respectively. The operating system implements a shortest remaining time first scheduling algorithm. Considering that the context switches at time zero and at the end are not counted the number of context switches are needed is ______.

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Q. What is the non - preemptive scheduling algorithm?

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Q. Which of the following statements are true?

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Q. On a single processor four jobs are to be executed. At time t = (0) + (jobs arrive in the order of A, B, C, D). The burst CPU time requirements are 4, 1, 8, 1 time units respectively.
Under Round Robin Scheduling with the time slice of 1 time unit the completion time of A is ______.

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Q. Interval between the time of submission and completion of the job is called

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Q. A scheduler which selects processes from secondary storage device is called

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