Microprocessor
PUSH B instruction in 8085 microprocessor causes

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

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Microprocessor
A microprocessor is ALU

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

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