Operating System (OS)
Two basic types of operating systems are:

batch and interactive
sequential and direct
sequential and realtime
None of these
batch and timesharing

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Operating System (OS)
Feed back queue

are very easy to implement
None of these
dispatch tasks according to execution characteristics
are used to favor real-time tasks
require manual intervention to implement properly

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Operating System (OS)
A public key encryption system

allows only the correct sender to decode the data
allows anyone to decode the transmission
None of these
allows only the correct receiver to decode the data
does not encode the data before transmitting it

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Operating System (OS)
The function(s) of file system is (are):

All of these
to provide complete file naming freedom to the users and to permit controlled sharing of files
None of these
to provide for long and short term storage of files with appropriate economic tradeoffs.
to provide security against loss of information due to system failure

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