Operating System (OS)
The main function of the dispatcher (the portion of the process scheduler) is

swapping a process to the disk
suspending some of the processes when the CPU load is high
assigning ready process to the CPU
None of these
bring processes from the disk to the main memory

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Operating System (OS)
Round-robin scheduling

None of these
allows processor-bound tasks more time in the processor
gives each task the same chance at the processor
is quite complex to implement
allows interactive tasks quicker access to the processor

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Operating System (OS)
Semaphores

synchronize critical resources to prevent contention
None of these
synchronize critical resources to prevent deadlock
are used to do I/O
are used for memory management

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