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

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

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Operating System (OS)
Memory management is :

replaced with virtual memory on current systems
critical for even the simplest operating systems
not used on multiprogramming systems
None of these
not used in modern operating system

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Operating System (OS)
Semaphores

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

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