Microprocessor
PUSH B instruction in 8085 microprocessor causes

 the contents of register B & C to be copied in the stack
 the contents of registers B & C to be transferred in the stack and and the registers get cleared
 the contents of register B only to be copied in the stack
 registers B & C to be cleared

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Microprocessor
The interrupt facility is provided in microprocessor to

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

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