Microprocessor
When RET instruction is executed by any subroutine then

 without any operation, the calling program would resume from instruction immediately following the call instruction.
 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.

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Microprocessor
DS directive in 8085

None of these
Forces the assembler to reserve one byte of memory
Forces the assembler to reserve a specified number of bytes in the memory
Forces the assembler to reserve a specified number of consecutive bytes in the memory

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Microprocessor
A microprocessor is ALU

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

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