AI-900 Practice Exam 55 — 20 Questions

Question 1

A retail company wants to predict the exact number of units of a product that will be sold next month. They have historical sales data and information about promotions and holidays. The target variable is the number of units sold, which is a continuous value. Which type of machine learning task should they perform?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Regression. Regression is the correct choice because the target variable—number of units sold—is a continuous numeric value. Regression algorithms, such as linear regression or decision forest regression, are designed to predict a numeric quantity from historical features like sales data, promotions, and holidays. In Azure Machine Learning, regression models output a real number, making them ideal for this forecasting scenario.

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Binary classification

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Multiclass classification

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Clustering

Question 2

A logistics company needs to automatically read shipping labels on packages. The labels contain printed text in various fonts and sizes, as well as handwritten addresses. Which Azure Computer Vision capability should they use to extract the text from the labels?

Accepted Answer

Optical Character Recognition (OCR) - Read API. The Read API (part of Azure Computer Vision's OCR capabilities) is specifically designed to extract printed and handwritten text from images, handling varied fonts, sizes, and styles. This makes it the correct choice for reading shipping labels that contain both printed text and handwritten addresses.

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Image Analysis

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Face API

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Custom Vision

Question 3

A developer uses Azure OpenAI Service to generate product descriptions. They want to ensure that the model only considers the most likely tokens that together have a cumulative probability of 0.95, ignoring very low-probability tokens that could lead to nonsensical outputs. Which parameter should they configure?

Accepted Answer

Top_p. (Top_p) is correct because the developer wants to limit token selection to those with a cumulative probability of 0.95, which is exactly what the Top_p (nucleus sampling) parameter controls. By setting Top_p to 0.95, the model will only consider the smallest set of tokens whose combined probability mass reaches 0.95, effectively ignoring low-probability tokens that could produce nonsensical outputs.

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Temperature

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Frequency penalty

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Presence penalty

Question 4

A data scientist trains a binary classification model to detect fraudulent transactions. The dataset contains 99% legitimate transactions (negative class) and 1% fraudulent transactions (positive class). The model predicts 'legitimate' for every transaction in the test set and achieves 99% accuracy. Which metric would best reveal that the model is failing to identify any fraudulent transactions?

Accepted Answer

Recall. Recall (also known as sensitivity or true positive rate) measures the proportion of actual positive cases (fraudulent transactions) that the model correctly identifies. With 99% accuracy but zero true positives, the recall is 0%, which immediately reveals the model's complete failure to detect fraud. In Azure Machine Learning, the classification metrics pane would show recall = 0.0 for the positive class, highlighting this issue despite high accuracy.

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Accuracy

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Precision

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F1-score

Question 5

What is 'abstractive summarization' vs. 'extractive summarization' in Azure AI Language, and which produces summaries in new words?

Accepted Answer

Abstractive generates new sentences; extractive selects existing sentences from the source. Abstractive summarization generates new sentences that rephrase the core meaning of the source text, similar to how a human would summarize. Extractive summarization, in contrast, selects and copies key sentences directly from the original document without rewording them. Option B correctly identifies that abstractive produces new sentences while extractive selects existing ones.

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Extractive produces new words; abstractive copies sentences

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They produce identical output through different computational paths

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Abstractive works only for legal documents; extractive for general text

Question 6

A customer support team wants to analyze chat transcripts to identify the most common issues customers are reporting. They need to automatically extract meaningful phrases like 'slow internet connection' and 'billing error' from the conversations. Which Azure AI Language feature should they use?

Accepted Answer

Key Phrase Extraction. Key Phrase Extraction is the correct Azure AI Language feature because it is specifically designed to automatically identify and extract the most important words and phrases from unstructured text, such as 'slow internet connection' and 'billing error' from chat transcripts. This allows the support team to surface common issues without manual review. Sentiment Analysis, NER, and Language Detection serve different purposes and do not extract meaningful multi-word phrases.

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Sentiment Analysis

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Named Entity Recognition (NER)

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Language Detection

Question 7

A data scientist evaluates a regression model that predicts house prices. On the test set, the Mean Absolute Error (MAE) is $8,000 and the Root Mean Squared Error (RMSE) is $25,000. What does the large difference between MAE and RMSE indicate about the model's errors?

Accepted Answer

The model has some predictions with very large errors. The large difference between MAE ($8,000) and RMSE ($25,000) indicates that the model has some predictions with very large errors. RMSE squares the errors before averaging, which heavily penalizes large deviations, so a significantly higher RMSE relative to MAE suggests the presence of outliers or extreme prediction errors in the test set.

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The model is overfitting the training data

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The model predictions are consistently biased high

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The model has high variance due to outliers in training data

Question 8

A law firm receives hundreds of legal documents daily. They need to automatically extract key entities like names of parties, dates, jurisdictions, and also classify each document as 'contract', 'pleading', or 'memo'. Which combination of Azure AI Language features should they use?

Accepted Answer

Entity recognition and custom text classification. The law firm needs both entity extraction (to identify parties, dates, jurisdictions) and document classification (contract, pleading, memo). Azure AI Language's prebuilt entity recognition handles the entity extraction, while custom text classification allows the firm to train a model to classify documents into their specific categories. This combination directly addresses both requirements without unnecessary features.

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Entity recognition and key phrase extraction

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Sentiment analysis and language detection

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Summarization and conversation analysis

Question 9

A manufacturing company wants to use computer vision to inspect products on an assembly line. They need to identify and locate specific types of defects (e.g., scratch, dent, crack) in product images. Which Azure Computer Vision capability should they use?

Accepted Answer

Object Detection. Object Detection is the correct choice because it not only classifies defects (e.g., scratch, dent, crack) but also provides bounding box coordinates to locate each defect within the product image. This meets the requirement to both identify and locate specific defect types on the assembly line.

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Image Classification

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Optical Character Recognition (OCR)

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Face Detection

Question 10

A hospital deploys an AI system to predict patient readmission risk using historical health records. To protect patient privacy, the hospital wants to ensure that individual patients cannot be identified from the data used for training. Which responsible AI principle is most directly relevant to this requirement?

Accepted Answer

Privacy and security. The requirement to prevent individual patient identification from training data directly aligns with the privacy and security principle, which mandates data anonymization, de-identification, and access controls. In AI systems, this is implemented through techniques like differential privacy (adding noise to data) or k-anonymity to ensure that outputs cannot be re-identified. The hospital's goal is to protect patient confidentiality, which is the core focus of this principle.

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Fairness

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Reliability and safety

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Inclusiveness

Question 11

What is 'retrieval augmented generation' (RAG) and which Azure services typically implement it?

Accepted Answer

Combining Azure AI Search (retrieval) with Azure OpenAI (generation) to ground LLM responses in a knowledge base. Retrieval Augmented Generation (RAG) is a pattern that combines a retrieval step with a generative step. In Azure, this is typically implemented by using Azure AI Search to retrieve relevant documents or chunks from a knowledge base, then passing those results as context to an Azure OpenAI model (e.g., GPT-4) to generate a grounded, fact-based response. This approach reduces hallucinations and ensures the output is based on authoritative data rather than the model's training data alone.

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Using Azure Storage to retrieve training data for model fine-tuning

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Using Azure CDN to deliver AI-generated content faster globally

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A method of compressing large datasets before training language models

Question 12

A marketing team wants to automatically analyze thousands of customer reviews to identify the most commonly discussed aspects, such as 'price', 'durability', or 'customer service'. They do not have any labeled data for custom training. Which prebuilt Azure AI Language feature should they use?

Accepted Answer

Key phrase extraction. Key phrase extraction is the correct choice because it automatically identifies the most important points or topics (like 'price', 'durability', 'customer service') from unstructured text without requiring any labeled training data. This prebuilt Azure AI Language feature is designed specifically to surface commonly discussed aspects from large volumes of text, making it ideal for analyzing thousands of customer reviews.

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Sentiment analysis

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Entity recognition

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Language detection

Question 13

Which responsible AI principle ensures that AI systems work reliably across different conditions and for all users, including those from different demographics?

Accepted Answer

Reliability and safety. The Reliability and safety principle ensures that AI systems perform consistently and correctly under a wide range of conditions, including edge cases and diverse demographic groups. This principle requires rigorous testing, validation, and monitoring to prevent failures or biased outcomes that could harm users. In the context of AI-900, this principle directly addresses the need for systems to work reliably for all users, regardless of age, gender, ethnicity, or other demographic factors.

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Privacy

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Transparency

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Accountability

Question 14

A multinational corporation receives customer support emails in multiple languages. They need to automatically identify the language of each email so it can be routed to the appropriate support team. Which Azure AI Language feature should they use?

Accepted Answer

Language detection. Language detection is the correct Azure AI Language feature because it is specifically designed to identify the written language of text input. The multinational corporation's requirement to automatically determine the language of each email for routing directly matches the core functionality of this prebuilt capability, which returns a language name and ISO 639-1 code for each document.

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Sentiment analysis

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Key phrase extraction

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Entity recognition

Question 15

A city deploys an AI system that automatically issues parking fines based on camera images. A citizen disputes a fine, claiming the system misidentified their car. The city cannot provide an explanation of how the system reached its decision because the model is too complex to interpret. Which Microsoft responsible AI principle is most directly violated?

Accepted Answer

Transparency. The city cannot explain how the AI system reached its decision, which directly violates the transparency principle. Transparency requires that AI systems be understandable and that organizations provide meaningful explanations of their behavior, especially when decisions have legal or financial consequences. The inability to interpret the model's reasoning prevents the citizen from understanding or challenging the fine, undermining trust and accountability.

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Privacy and security

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Inclusiveness

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Reliability and safety

Question 16

A university wants to build a chatbot that can answer questions about its admission procedures. The chatbot should retrieve answers directly from a set of official PDF documents containing policies and FAQs. Which Azure AI Language feature should they use to implement this?

Accepted Answer

Custom question answering. Custom question answering (C) is the correct choice because it allows the university to ingest official PDF documents and create a knowledge base of question-answer pairs. The chatbot can then retrieve answers directly from this curated content, making it ideal for domain-specific, document-based Q&A scenarios like admission procedures.

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Sentiment analysis

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Key phrase extraction

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Language detection

Question 17

A healthcare organization deploys an AI diagnostic system that was trained primarily on data from patients in one geographic region. When used in other regions with different demographics, the system shows significantly lower accuracy for those populations. Which Microsoft responsible AI principle is most directly violated?

Accepted Answer

Fairness. The system's accuracy drop across different demographics directly violates the Fairness principle, which requires AI systems to treat all groups equitably and avoid bias. Because the training data was geographically homogeneous, the model learned patterns that do not generalize, leading to disparate performance for underrepresented populations.

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Transparency

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Privacy

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Inclusiveness

Question 18

A customer support team wants to create a chatbot that can answer common questions about employee benefits. They have a PDF document containing a list of frequently asked questions with their answers. Which Azure AI Language feature should they use to build a solution that extracts answers directly from this content?

Accepted Answer

Custom Question Answering. Custom Question Answering (C) is the correct choice because it is specifically designed to ingest documents like PDFs and extract question-answer pairs from them, enabling a chatbot to respond directly with answers from the content. This feature uses a pre-built or custom knowledge base to match user queries to the most relevant answer, making it ideal for the described scenario.

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Sentiment Analysis

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Key Phrase Extraction

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Text Analytics for Health

Question 19

A research organization is developing an AI system to assist with medical diagnosis. They want to ensure that if the system makes an error, there is a clear process for auditing and determining responsibility. Which Microsoft responsible AI principle is most relevant?

Accepted Answer

Accountability. Accountability is the Microsoft responsible AI principle that requires organizations to define and maintain clear processes for auditing, reviewing, and taking responsibility for AI system outcomes. In this scenario, the need for a clear process to audit errors and determine responsibility directly aligns with accountability, which mandates that AI systems have governance structures, human oversight, and audit trails to assign ownership for decisions and mistakes.

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Privacy and Security

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Inclusiveness

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Transparency

Question 20

Which Azure AI service is used to index and extract insights from large collections of videos at scale?

Accepted Answer

Azure AI Video Indexer. Azure AI Video Indexer is the correct service because it is specifically designed to ingest large collections of videos, extract metadata (such as transcripts, faces, emotions, and keyframes), and provide searchable insights at scale. Unlike other Azure AI services, Video Indexer combines multiple AI models (speech, vision, and language) into a single pipeline optimized for video content, making it the appropriate choice for indexing and extracting insights from video libraries.

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Azure AI Custom Vision

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Azure Blob Storage media services

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Azure AI Speech transcription only