Operating System (OS)
Operating system is

A collection of hardware components
A collection of input-output devices
None of these
A collection of software routines
All of these

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Operating System (OS)
The FIFO algorithm

execute first the job that has been in the queue the longest
executes first the job that first entered the queue
executes first the job that last entered the queue
executes first the job with the least processor needs
None of these

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Operating System (OS)
Assembler language

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

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Operating System (OS)
A critical region is

none is the above
a program segment that often causes unexpected system crashes
a program segment that has not been proved bug-free
a program segment where shared resources are accessed
one which is enclosed by a pair of P and V operations on semaphores

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