AI-102 Practice Question: Implement knowledge mining and document intelligence solutions
A company is building a knowledge mining solution using Azure AI Search. They need to extract text from handwritten notes stored as images in Azure Blob Storage. They want to use the built-in OCR skill in a skillset. Which cognitive service does the OCR skill rely on?
⚠ Common exam trap
Many exam-takers confuse Azure AI Document Intelligence with the OCR skill, but Document Intelligence is a separate service not used by the built-in OCR skill.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure AI Vision
The built-in OCR skill in Azure AI Search is powered by the Computer Vision OCR API, which is part of Azure AI Vision. This service extracts text from images, including handwritten text, and returns it as structured data. The skill then makes this text available for indexing. Other cognitive services like Language, Document Intelligence, and Translator serve different purposes and are not used by the OCR skill.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Azure AI Language
Why it's wrong here
Azure AI Language provides natural language processing features such as sentiment analysis, key phrase extraction, and entity recognition. It does not perform optical character recognition on images. The OCR skill specifically requires image analysis capabilities, which are provided by Azure AI Vision, not Azure AI Language.
- ✗
Azure AI Document Intelligence
Why it's wrong here
Azure AI Document Intelligence is designed for extracting structured data from documents like forms and invoices. While it can perform OCR as part of its analysis, the built-in OCR skill in Azure AI Search does not use Document Intelligence; it uses the Computer Vision OCR API. Document Intelligence is a separate service with its own models and APIs.
- ✗
Azure AI Translator
Why it's wrong here
Azure AI Translator is used for text translation between languages. It does not extract text from images. The OCR skill requires image-to-text conversion, which is not a capability of Translator. Therefore, it cannot be the service behind the OCR skill.
- ✓
Azure AI Vision
Why this is correct
This is correct because the OCR skill in Azure AI Search uses the Computer Vision OCR API from Azure AI Vision. It extracts text from images, including handwritten text, depending on the language and model. The skill sends image data to the Azure AI Vision service and receives recognized text, which is then enriched into the search index.
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
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Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Microsoft exam blueprint
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