Exam-style question
Try this first
A student makes a mistake while revising Calculate Depth From Pulse Return Time. Which correction is most accurate?.
- A.A. The correction is to keep calculate depth from pulse return time separate from the common neighbouring idea in Non-ionising imaging, then explain the tested distinction.
- B.B. The mistake is harmless because the two ideas always mean the same thing.
- C.C. The correction is to memorise the wording without explaining the distinction.
- D.D. The answer should move to a different Non-ionising imaging topic instead of fixing the misconception.
Model answer
What a good answer should say
- Boundary Check answer 916d6d: A.
- The correction is to keep calculate depth from pulse return time separate from the common neighbouring idea in Non-ionising imaging, then explain the tested distinction.
- is correct because it matches Calculate depth from pulse return time.
- through ultrasound reflection, acoustic impedance, X-ray attenuation, half-value thickness.
Explanation
Why this works
Stem being answered: A student makes a mistake while revising Calculate Depth From Pulse Return Time. Which correction is most accurate?
Route focus: medical-physics / Non Ionising Imaging. Key vocabulary for this item: depth, pulse, return, time.
Option check: keep Boundary Check answer 916d6d: A because it matches the stem; reject alternatives that change depth, pulse, return or use a neighbouring model. The explanation should keep the answer tied to these exact words rather than a general physics summary, using units, graph evidence or equation reasoning only when they are relevant to the stem.
Common mistake
No common mistake is linked to this question yet.