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.

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

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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 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 and also the PC will be incremented after the execution of the instruction.
 the top of the stack will be popped out and assigned to the PC.

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Microprocessor
The output data lines of microprocessor and memories are usually tristated because

 More than one device can transmit information over the data bus by enabling only one device at a time
 It increases the speed of data transfer over the data bus
 More than one device can transmit over the data bus at the same time
 The data line can be multiplexed for both input and output

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