Microprocessor
When RET instruction is executed by any subroutine then

 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 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.

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Microprocessor
The interrupt facility is provided in microprocessor to

 stop the microprocessor when desired
 change the sequence of the instructions being executed
 stop the microprocessor when it starts malfunctioning
 keep a control on the working of the microprocessor

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Microprocessor
Assertion(A): Ready signal of microprocessor is used to detect whether a peripheral is ready for the data transfer or not. Reason(R): In the microprocessor during data transfer operations, the wait states are added by forcing the ready signal low.

 A is false but R is true.
 A is true but R is false.
 Both A & R are true but R is not the correct explanation of A .
 Both A & R are true and R is the correct explanation of A.

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