AI-900 Practice Questions

According to the Microsoft Azure AI Fundamentals (AI-900) official study guide and the Microsoft Learn module “Identify guiding principles for responsible AI”, responsible AI is built upon six foundational principles: Fairness, Reliability and Safety, Privacy and Security, Inclusiveness, Transparency, and Accountability. Each principle serves to guide the ethical design, deployment, and management of artificial intelligence systems.

Fairness – This principle ensures that AI systems treat all people fairly and do not discriminate based on personal attributes such as gender, race, or age. The Microsoft Learn content emphasizes that “AI systems should treat everyone fairly” and that organizations must evaluate datasets and model outputs for bias. In this scenario, “The system must not discriminate based on gender, race” clearly aligns with Fairness because it directly addresses equitable treatment and unbiased decision-making.

Privacy and Security – Microsoft’s responsible AI framework stresses that “AI systems must be secure and respect privacy.” This means personal data should be safeguarded, processed lawfully, and visible only to authorized users. The statement “Personal data must be visible only to approved users” reflects the importance of protecting sensitive information and controlling access—precisely the intent of the Privacy and Security principle.

Transparency – Transparency refers to ensuring that users understand how AI systems operate and make decisions. Microsoft notes that “AI systems should be understandable and users should be able to know why decisions are made.” The requirement “Automated decision-making processes must be recorded so that approved users can identify why a decision was made” directly supports this principle. Transparency promotes trust and accountability by documenting the reasoning behind AI outputs.

Reliability and Safety, though another core principle, does not directly relate to any of the provided statements in this question.

<  Smart home device answering questions → Yes

 Webchat using Azure Bot Service → Yes

 Auto-caption generation for videos → No

According to the Microsoft Azure AI Fundamentals (AI-900) official study guide and the Microsoft Learn module “Describe features of common AI workloads”, Conversational AI refers to systems designed to engage in human-like dialogue through natural language—either text or speech. These systems include chatbots, virtual assistants, and voice-enabled smart devices, all of which can interpret user intent and respond meaningfully.

A smart device in the home that responds to questions such as “When is my next appointment?” – Yes.This is a classic example of Conversational AI. Devices like smart speakers or personal digital assistants use speech recognition, natural language understanding (NLU), and language generation to interpret spoken input and respond conversationally. The AI-900 study materials identify these as examples of voice-based conversational AI systems, which fall under the Speech and Language AI workloads.

An interactive webchat feature on a company website can be implemented by using Azure Bot Service – Yes.This statement is true. The Azure Bot Service is the primary Microsoft tool for creating and deploying conversational bots across various channels, including websites, Microsoft Teams, and other messaging platforms. The AI-900 syllabus specifically cites this as an example of implementing conversational AI for customer support or information retrieval.

Automatically generating captions for pre-recorded videos is an example of conversational AI – No.This is not conversational AI; instead, it falls under the Speech AI workload, specifically speech-to-text transcription. Automatically generating captions involves converting audio from video into written text but does not involve dialogue or interaction between a user and a system.

Thus, based on the official AI-900 guidance, only the first two scenarios describe conversational AI use cases.

The Transformer model architecture is a foundational deep learning model introduced in the 2017 research paper “Attention Is All You Need.” It serves as the core architecture for modern large language models such as GPT, BERT, and T5, all of which are used in Azure OpenAI Service.

“A transformer model architecture uses self-attention.” – YesThe self-attention mechanism is the defining feature of transformer models. It allows the model to evaluate the relationships between words (tokens) in a sequence and assign weights based on contextual relevance. This means that each word in an input sentence can " attend " to every other word, capturing dependencies regardless of their position in the text. This mechanism replaced older recurrent (RNN) and convolutional (CNN) architectures for sequence processing because it provides parallelization and better context understanding.

“A transformer model architecture includes an encoder block and a decoder block.” – YesThe original Transformer architecture includes both an encoder and a decoder. The encoder processes the input sequence into contextual representations, and the decoder generates the output sequence based on both the encoder’s output and previously generated tokens. Models like BERT use only the encoder stack, while GPT models use only the decoder stack, but the full Transformer design conceptually includes both.

“A transformer model architecture includes an encryption block or a decryption block.” – NoTransformers are not related to cryptography. They perform encoding and decoding of language data for representation learning—not encryption or decryption for data security. The terms “encoder” and “decoder” here refer to neural network components, not cryptographic processes.

validation.

In the Microsoft Azure AI Fundamentals (AI-900) study materials, a key concept in machine learning model development is splitting data into subsets for training, validation, and testing. A randomly extracted subset of data from a dataset is most commonly used for validation — that is, for evaluating the performance of the model during or after training.

Here’s how this process works:

Training set – This portion of the dataset is used to train the machine learning model. The model learns patterns, relationships, and parameters from this data.

Validation set – This is a randomly selected subset (separate from training data) used to fine-tune model hyperparameters and evaluate how well the model generalizes to unseen data. It helps detect overfitting — when the model performs well on training data but poorly on new data.

Test set – A final, untouched dataset used to measure the model’s real-world performance after all training and tuning are complete.

By reserving a random subset for validation, data scientists ensure that the model’s performance metrics reflect generalization, not memorization of the training data.

Let’s review the incorrect options:

Algorithms – These are the mathematical frameworks or methods used to build models (e.g., decision trees, neural networks). They are not data subsets.

Features – These are input variables (attributes) used by the model, not randomly selected data subsets.

Labels – These are target values or outcomes the model predicts; again, not data subsets.

Therefore, in alignment with Azure AI-900’s machine learning fundamentals, the correct completion is:

✅ “A randomly extracted subset of data from a dataset is commonly used for validation of the model.”

According to the Microsoft Azure AI Fundamentals (AI-900) official study materials, object detection is a type of computer vision workload that not only identifies objects within an image but also determines their location by drawing bounding boxes around them. This functionality is clearly described in the Microsoft Learn module “Identify features of computer vision workloads.”

In this scenario, the AI system analyzes an image to find a vehicle and then returns a bounding box showing where that vehicle is located within the image frame. That ability — to detect, classify, and localize multiple objects — perfectly defines object detection.

Microsoft’s study content contrasts object detection with other computer vision workloads as follows:

Image classification: Determines what object or scene is present in an image as a whole but does not locate it (e.g., “this is a car”).

Object detection: Identifies what objects are present and where they are, usually returning coordinates for bounding boxes (e.g., “car detected at position X, Y”).

Optical Character Recognition (OCR): Extracts text content from images or scanned documents.

Facial detection: Specifically locates human faces within an image or video feed, often as part of face recognition systems.

In Azure, object detection capabilities are available through services such as Azure Computer Vision, Custom Vision, and Azure Cognitive Services for Vision, which can be trained to detect vehicles, products, or other objects in various image datasets.

Therefore, based on the AI-900 study guide and Microsoft Learn materials, the verified and correct answer is Object detection, as it accurately describes the process of returning a bounding box indicating an object’s position in an image.