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

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

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Operating System (OS)
The term "operating system" means

None of these
the way a computer operator works
the way a floppy disk drive operates
a set of programs which controls computer working
conversion of high level language into machine code

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