Microprocessor
A microprocessor is ALU

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

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Microprocessor
PUSH B instruction in 8085 microprocessor causes

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

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Microprocessor
When RET instruction is executed by any subroutine then

 the top of the stack will be popped out and assigned to the PC.
 without any operation, the calling program would resume from instruction immediately following the call instruction and also the PC will be incremented after the execution of the instruction.
 the PC will be incremented after the execution of the instruction.
 without any operation, the calling program would resume from instruction immediately following the call instruction.

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