About this practice. Revision Robin is built and maintained by Bloor Engineering Ltd, a UK-registered company. Our Azure AI Fundamentals (AI-900) questions are written and reviewed in-house to match the current syllabus, each with a plain-English worked explanation. They are original practice material, not the official exam questions and not affiliated with or endorsed by Microsoft. Always confirm current test rules, fees and content with the official provider at Microsoft Credentials. See our Terms and Privacy.
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Q1. A retail company wants to identify unusual spikes in daily website traffic that could indicate a fraud attack. Which type of AI workload best fits this requirement?
A. Anomaly detection
B. Computer vision
C. Natural language processing
D. Knowledge mining
Show answer & explanation
✓ Answer: A. Anomaly detection
Anomaly detection workloads are designed to identify data points that deviate significantly from expected patterns, such as unusual traffic spikes. Computer vision and NLP work with images and text respectively, not numeric time-series patterns.
Q2. What does the term 'overfitting' describe in a machine learning model?
A. The model performs poorly on both training and new data
B. The model performs very well on training data but poorly on new, unseen data
C. The model has too few features to make accurate predictions
D. The model takes too long to train due to excessive data volume
Show answer & explanation
✓ Answer: B. The model performs very well on training data but poorly on new, unseen data
Overfitting occurs when a model learns the training data too closely, including its noise, so it fails to generalise to new data. This is different from underfitting, where the model performs poorly on both training and new data because it is too simple.
Q3. After training a Custom Vision object detection model, the evaluation shows high precision but low recall. What does this indicate?
A. Most positive predictions are correct, but many actual objects in the images were missed
B. Most positive predictions are wrong, but nearly all actual objects were found
C. The model performs equally poorly at finding and correctly labelling objects
D. The model cannot be published until precision and recall are both 100%
Show answer & explanation
✓ Answer: A. Most positive predictions are correct, but many actual objects in the images were missed
High precision means that when the model predicts an object, it is usually correct; low recall means the model is failing to detect many objects that are actually present, effectively under-predicting. Confusing precision and recall in the opposite direction is a common exam trap.
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Who has to sit the Azure AI Fundamentals (AI-900)
Who needs a Azure AI Fundamentals (AI-900)?
Individuals interested in AI/ML concepts and Azure AI services, incl. non-technical pros, students, IT pros, developers, data/business analysts.
The real Azure AI Fundamentals (AI-900): format
How many questions are in the Azure AI Fundamentals (AI-900)?
The real Azure AI Fundamentals (AI-900) has 40 questions and lasts 60 minutes. Our mock uses 50 questions in 45 minutes.
What is the Azure AI Fundamentals (AI-900) pass mark?
Real exam pass mark: 700 out of 1000. Our mock marks you at 35 out of 50, the threshold we mark against.
What it costs, and what a resit costs
How much does the Azure AI Fundamentals (AI-900) cost?
Real exam fee: £69. Resit fee: £69. Rebooking after a fail: 24 hours after 1st fail; 14 days between subsequent fails (up to 5 attempts in 12 months)
How hard is it
How hard is the Azure AI Fundamentals (AI-900)?
Difficulty: Low, entry-level, least technical of Microsoft fundamental certifications.
Why people fail it
Why do people fail the Azure AI Fundamentals (AI-900)?
Confusing similar Azure AI services.
Ignoring Responsible AI principles.
Complexity of Natural Language Processing (NLP) domain.
Figures for the real exam from vertexaisearch.cloud.google.com, checked October 2026. Fees and rules change, so confirm with the test provider before you book.
Azure AI Fundamentals (AI-900): common questions
Frequently asked
How long do you get?
The test is timed at 45 minutes. Our full mock runs on the same clock so you can practise your pacing.
Are these the real exam questions?
No. Our questions are original and written to match the current syllabus, so they give realistic practice without copying the official paper. Every answer comes with a plain-English explanation. Always confirm current rules and content with Microsoft.