Operating System (OS)
Four necessary conditions for deadlock to exist are: mutual exclusion, no-preemption, circular wait and

race around condition
None of these
hold and wait
buffer overflow
deadlock avoidance

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Operating System (OS)
Thrashing can be avoided if

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

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