Microprocessor
A microprocessor is ALU

 register unit and I/O device on a single chip.
 and memory on a single chip.
 register unit and control unit on a single chip.
 and control unit on a single chip.

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Microprocessor
The interrupt facility is provided in microprocessor to

 stop the microprocessor when it starts malfunctioning
 change the sequence of the instructions being executed
 stop the microprocessor when desired
 keep a control on the working of the microprocessor

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