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

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

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Operating System (OS)
Assembler language

is usually the primary user interface
None of these
requires fixed-format commands
is quite different from the SCL interpreter
is a mnemonic form of machine language

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Operating System (OS)
Most of the microcomputer's operating systems like Apple DOS, MS DOS and PC DOS etc. are called disk operating systems because

None of these
they are partly in primary memory and partly on disk
they are available on magnetic tapes
they are initially stored on disk
they are memory resident

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Operating System (OS)
Thrashing

None of these
can always be avoided by swapping
can be caused by poor paging algorithms
is a natural consequence of virtual memory systems
always occurs on large computers

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