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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Q. The scheduling in which CPU is allocated to the process with least CPU-burst time is called

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Q. The “turn-around” time of a user job is the

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Q. Program ‘preemption’ is

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Q. “Throughput” of a system is

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Q. Jobs which are admitted to the system for processing is called

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Q. ___________ is a technique of improving the priority of process waiting in Queue for CPU allocation.

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Q. .............. refers to a situation in which a process is ready to execute but is continuously denied access to a processor in deference to other processes.

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Q. Which of the following are the states of a five state process model?

i) Running ii) Ready iii) New iv) Exit v) Destroy

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Q. State which statement is true for Suspended process?

i) The process is not immediately available for execution.
ii) The process may be removed from suspended state automatically without removal order.

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Q. Following is/are the reasons for process suspension.

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Q. Match the following mechanisms for interrupting the execution of a process and their uses.

i) Interrupt a) Call to an operating system function
ii) Trap b) Reaction to an asynchronous external event
iii) Supervisor Call c) Handling of a error or an exception condition

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Q. In process scheduling, …………………… determines when new processes are admitted to the system.

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