RAG Assistant Repeats Same Question Explained
This worked AI Engineer Interview practice question tests Validation and Learning. Try the answer first, then review why D is the best choice.
Short answer
The correct answer is D. Nothing was fixed: repeatability and correctness are different properties; the model now fails identically every time..
The answer was already consistently wrong with the evidence present, which points at grounding, context position, or extraction — determinism just froze the failure. The key is to match the exact action in the prompt to the tool, command, or concept that performs that action directly. Here, D. Nothing was fixed: repeatability and correctness are different properties; the model now fails identically every time. is the only option that satisfies the scenario without adding unrelated behavior.
The Question
A RAG assistant repeats the same wrong answer even though the correct paragraph is in context. A teammate sets temperature to zero and declares it fixed because output is now deterministic. What actually happened?
Why D is correct
The answer was already consistently wrong with the evidence present, which points at grounding, context position, or extraction — determinism just froze the failure. The key is to match the exact action in the prompt to the tool, command, or concept that performs that action directly. Here, D. Nothing was fixed: repeatability and correctness are different properties; the model now fails identically every time. is the only option that satisfies the scenario without adding unrelated behavior.
Why the other options are wrong
Option A does not match the requirement in the prompt. The correct answer is D because The answer was already consistently wrong with the evidence present, which points at grounding, context position, or extraction — determinism just froze the failure.
Option B does not match the requirement in the prompt. The correct answer is D because The answer was already consistently wrong with the evidence present, which points at grounding, context position, or extraction — determinism just froze the failure.
Option C does not match the requirement in the prompt. The correct answer is D because The answer was already consistently wrong with the evidence present, which points at grounding, context position, or extraction — determinism just froze the failure.
Key idea: Validation and Learning
Every question is a production situation an AI engineer interviewer can put to you: a failing endpoint, a cost spike, an agent that loops, an eval that disagrees with users. The best answer is almost always the one that measures or contains the problem before it changes the model or the prompt. If you miss a question, note which habit it tests: decompose before you fix, put the security boundary where the side effect happens, and trust an eval only after you check what it covers. The 12 open-ended questions with answer guides are at aijobprep.app/questions/ai-engineer.html.
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