DP-900 Describe core data concepts Practice Question
This DP-900 practice question tests your understanding of describe core data concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A data analyst receives a dataset containing customer order details stored in a CSV file, a JSON file with product reviews, and a folder of JPEG images of products. Which of the following correctly categorizes these data types from most structured to least structured?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
CSV → JSON → JPEG
CSV files are highly structured with rows and columns defined by a schema, making them the most structured. JSON files are semi-structured, using key-value pairs and nested objects that allow flexibility but lack a fixed schema. JPEG images are unstructured binary data with no inherent schema, so the correct order from most to least structured is CSV → JSON → JPEG, making option C correct.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
CSV → JPEG → JSON
Why it's wrong here
This order is incorrect because JPEG is unstructured, which is less structured than JSON (semi-structured).
✗
JSON → CSV → JPEG
Why it's wrong here
This order is incorrect because CSV (structured) is more structured than JSON (semi-structured).
✓
CSV → JSON → JPEG
Why this is correct
Correct. CSV is structured, JSON is semi-structured, and JPEG is unstructured, so this is the correct order from most to least structured.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
JPEG → JSON → CSV
Why it's wrong here
This order is reversed; JPEG (unstructured) is the least structured, not the most.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Microsoft often tests the misconception that JSON is more structured than CSV because it uses named keys, but in reality, CSV's fixed schema makes it more structured than JSON's flexible, self-describing format.
Detailed technical explanation
How to think about this question
CSV files enforce a strict row-column relationship with a delimiter (e.g., comma) and often a header row, making them directly loadable into relational databases. JSON uses a tree-like structure with objects, arrays, and primitive types, allowing nested data but requiring parsing to enforce schema. JPEG images are compressed binary streams defined by the JPEG standard (ISO/IEC 10918), with no inherent data organization beyond pixel encoding, thus requiring external metadata for interpretation.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
Describe core data concepts — This question tests Describe core data concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: CSV → JSON → JPEG — CSV files are highly structured with rows and columns defined by a schema, making them the most structured. JSON files are semi-structured, using key-value pairs and nested objects that allow flexibility but lack a fixed schema. JPEG images are unstructured binary data with no inherent schema, so the correct order from most to least structured is CSV → JSON → JPEG, making option C correct.
What should I do if I get this DP-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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