State After Two Shifts

Correct Answer

C — 01111001

Concept and Reasoning

Shift the serial data right-most bit first into the specified end of the 8-bit register, one bit per clock, while moving the existing contents one position each time. Applying two clock pulses to initial state 11100100 with the first two incoming bits from 10110101 gives the register state shown in option C.

Calculation / Key Relation

One clock → one serial bit inserted and all stored bits shift one place

Exam Takeaway

Write the first two serial bits in the actual entry order before shifting.

Common Mistake

Do not read “right-most bit first” as left-most bit first.