Operating System (OS)
The ability of an operating system to control the activities of multiple program at the same time is called

Multitasking
Multioperating
Multipaging
Multiprocessing

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Operating System (OS)
Thrashing can be avoided if

the speed of CPU is increased
None of these
All of these
the pages, belonging to the working set of the programs, are in main memory
the speed of I/O processor is increased

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Operating System (OS)
System maintenance:

is necessary on all systems, regardless of how good
None of these
is not required if the system is well written
always requires several programs
is usually not necessary

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