Correct AnswerA. Right, one
Quick Explanation
A 4-bit shift register loaded in parallel still shifts one bit position for each clock pulse once placed in shift mode. Under the convention used in the question, it shifts one position to the right per clock.
Detailed Explanation
Concept & Reasoning
Parallel loading determines how the initial 4-bit word enters; it does not mean four positions shift at once. During serial shift operation, every active clock moves each stored bit to the adjacent stage by one position. Direction is set by the register configuration/control input.
How to Solve It in the Exam
Parallel load ≠ parallel shift.
Important Exam PointRead the direction stated/assumed by the device before tracing bits.
Related Revision Path
This question sits in the revision path Digital Electronics → Sequential Logic → Shift Registers .