Module 09 Knowledge Check
5 questions. Pass mark 4 out of 5. Answer every question before checking the answer key below, then retry after reading the feedback.
1. An individual dimension of an image embedding…
- A. encodes a nameable attribute
- B. means nothing on its own
- C. is a colour channel
- D. indicates confidence
2. Two photos matching with high similarity may have matched on…
- A. object identity only
- B. lighting, background or pose rather than the object
- C. file size
- D. resolution
3. A similarity search for an object absent from the index…
- A. returns nothing
- B. returns k results anyway, all irrelevant
- C. raises an error
- D. returns a low-confidence flag
4. Near-duplicates should be detected…
- A. after training
- B. before splitting, by embedding similarity
- C. by file hash
- D. only for exact copies
5. Searching an index with a different embedding model than built it…
- A. raises a dimension error
- B. returns plausible, meaningless rankings
- C. returns nothing
- D. auto-converts
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Answer Key and Explanations
Check these only after attempting every question.
1. B - means nothing on its own
Only angles between vectors carry meaning, which is why every use is a comparison.
2. B - lighting, background or pose rather than the object
A general-purpose embedding cannot tell you which attribute drove a given match.
3. B - returns k results anyway, all irrelevant
A score threshold is what turns a ranking into a decision about whether to answer.
4. B - before splitting, by embedding similarity
File hashes miss video frames and burst photos, and a straddling pair inflates every score you report.
5. B - returns plausible, meaningless rankings
The vectors occupy different spaces. There is no symptom - record which model produced an index.
Practical Check
Apply this module to your own work: complete the module activity for *Embeddings and Image Similarity*, then write one sentence naming what your result shows and one naming what it does not.
Strong Answer Pattern
A strong answer names the task, the evidence used, the check performed, and the remaining limitation. It avoids "proved", "guaranteed", or "always" unless the evidence genuinely supports it.