Operating System (OS)
The category of operating system that you most likely have running on your PDA computer is a ....... Operating system

Single user, single task
Multiuser, multitask
Real time
Single user, multitask

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Operating System (OS)
System maintenance:

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

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Operating System (OS)
Addressing structure

are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
All of these
None of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
defines the fundamental method of determining effective operand addresses

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