Operating System (OS)
Object modules generated by assemblers that contain unresolved external references are resolved for two or more object modules by a/an

loader
linker
compiler
None of these
operating system

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Operating System (OS)
Semaphores

None of these
are used to do I/O
are used for memory management
synchronize critical resources to prevent deadlock
synchronize critical resources to prevent contention

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Operating System (OS)
A spooler is a

Program that coordinates the print job that are waiting to process
Queue of print job that are waiting to print
Message sent from the printer to the operating system when a print job is completed
Location in memory that maintains the contents of documents until it prints

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Operating System (OS)
The instruction register

None of these
is a hardware memory device which denotes the location of the current instruction being executed.
contains the address of the memory location that is to be read from or stored into.
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".

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