Operating System (OS)
A page fault occurs when

the Segmentation starts
the page is found in the memory
the Deadlock happens
the page is not found in the memory

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

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

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