Operating System (OS)
The CPU, after receiving an interrupt from an I/O device

branches off to the interrupt service routine immediately
None of these
branches off to the interrupt service routine after completion of the current instruction
halts for a predetermined time
hands over control of address bus and data bus to the interrupting device

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Operating System (OS)
All of the following are task performed by the operating system except

Performing housekeeping task like file compression and disk defragmentation
Provides an interface for user to interact with computer
Controlling the access that application program has to the CPU
Managing hardware on the computer

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Operating System (OS)
The dispatcher

never changes task priorities
None of these
actually schedules the tasks into the processor
puts tasks in I/O wait
is always small and simple

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