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.
 without any operation, the calling program would resume from instruction immediately following the call instruction.
 the PC will be incremented after the execution of the instruction.

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Microprocessor
When referring to instruction words, a mnemonic is

 a short abbreviation for the operand address.
 shorthand for machine language.
 a short abbreviation for the data word stored at the operand address.
 a short abbreviation for the operation to be performed.

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Microprocessor
HLDA signal in 8085 performs the following operation:

 Indicates that the CPU has not received the HOLD request.
 Indicates that the CPU has received the HOLD request and that it will relinquish the bus in the next clock cycle.
 Hold the data in the accumulator until the microprocessor is turned OFF.
 Indicates that another master is requesting the use of the address and data buses.

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