Operating System (OS)
....... is the layer of a computer system between the hardware and the user program

System environment
Operating system
None of these
Operating environment

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Operating System (OS)
Paging

allows multiple programs to reside in separate areas of core at the time.
None of these
consists of those addresses that may be generated by a processor during execution of a computation.
is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.
is a method of allocating processor time.

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Operating System (OS)
Which of the following statement is true.

Seek analysis is used for analysing control-unit busy problems.
Thrashing is a natural consequence of virtual memory systems.
All of these
None of these
The LRU algorithm pages out pages that have been used recently

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