Microprocessor
The instruction set of a microprocessor

 is specified by the user
 cannot be changed by the user
 is specified by the manufacturers
 is stored inside the microprocessor

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Microprocessor
PUSH B instruction in 8085 microprocessor causes

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

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