Operating System (OS)
Memory management is :

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

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Operating System (OS)
A linker

None of these
must be run after the loader
is not necessary with variable partitions
is not needed with a good compiler
creates a load module

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

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

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