Microprocessor
The 8085 microprocessor enters into bus idle machine cycle whenever

 DAD RP instruction is executed
 RST 7.5 is recognized
 INTR interrupt is recognized
None of these

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Microprocessor
The interrupt facility is provided in microprocessor to

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

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