Q. A page fault

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Q. A semaphore count of negative n means (s = –n) that the queue contains ………….. waiting processes.

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Q. A program is located in the smallest available hole in the memory is ……………

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Q. With a four programs in memory and with 80% average I/O wait, the CPU utilization is?

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Q. Assume N segments in memory and a page size of P bytes. The wastage on account of internal fragmentation is:

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Q. Suppose it takes 100 ns to access a page table and 20 ns to access associative memory with a 90% hit rate, the average access time equals:

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Q. Variable partition memory management technique with compaction results in:

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Q. Four jobs J1, J2, J3 and J4 are waiting to be run. Their expected run times are 9, 6, 3 and 5 respectively. In order to minimize average response time, the jobs should be run in the order:

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Q. Suppose it takes 100 ns to access page table and 20 ns to access associative memory. If the average access time is 28 ns, the corresponding hit rate is:

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Q. N processes are waiting for I/O. A process spends a fraction p of its time in I/O wait state. The CPU utilization is given by:

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Q. If holes are half as large as processes, the fraction of memory wasted in holes is:

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Q. An example of a non pre-emptive scheduling algorithm is:

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Q. An example of distributed OS is:

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Q. In which of the following, ready to execute processes must be present in RAM?

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Q. If the executing program size is greater than the existing RAM of a computer, it is still possible to execute the program if the OS supports:

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Q. Files that are related to input/output and are used to model serial I/O devices such as terminals, printers and networks are called :

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Q. An example of a possible file attribute is:

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Q. An example of a non-preemptive CPU scheduling algorithm is:

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Q. There are ‘n’ processes in memory. A process spends a fraction ‘p’ of its time waiting for I/O to complete. The CPU utilization is given by:

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Q. With 64 bit virtual addresses, a 4KB page and 256 MB of RAM, an inverted page table requires:

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