1500 Questions | ISTQB AI Testing Certification (CT-AI) 2026

Detailed Exam Domain Coverage

• AI and Machine Learning Fundamentals (20%): Covers the different types of AI, along with various machine learning models and techniques.

• Testing AI-Powered Applications (40%): Focuses on the practical aspects of testing conversational AI, as well as testing natural language processing (NLP) and complex machine learning models.

• AI Testing Methodologies and Tools (20%): Addresses testing within AI-powered software development life cycles and integrating AI testing seamlessly into DevOps.

• Specialized Topics and Industry Trends (20%): Explores AI testing in cloud and IoT environments, alongside critical methods for addressing bias and diversity in AI testing.

Course Description

I designed this comprehensive practice test course to help software testers, QA professionals, and engineers master the ISTQB Certified Tester – AI Testing (CT-AI) certification. Preparing for this specific exam requires a deep understanding of how to verify that software can correctly interact with conversational AI and how to thoroughly assess AI-powered features. Traditional testing approaches are often insufficient for machine learning models, which is why this question bank focuses heavily on the unique methodologies required for AI.

To ensure you are fully prepared, I have created 1500 original practice questions that directly mirror the syllabus and difficulty of the real CT-AI exam. This is not a surface-level overview. Every single question in this course comes with a detailed, in-depth explanation for why the correct option is right and why the other options are wrong. This allows you to learn the core concepts behind natural language processing, model evaluation, and bias detection while you test your knowledge. Search engines and platform algorithms look for depth, and this course provides exactly that for anyone serious about passing their certification on the first attempt.

Practice Questions Preview

Question 1: AI and Machine Learning Fundamentals Which of the following best describes an unsupervised machine learning model?

• A) A model trained on a labeled dataset where the desired output is known.

• B) A model that learns by interacting with an environment and receiving rewards or penalties.

• C) A model that analyzes unlabelled data to find hidden patterns, groupings, or structures.

• D) A model that relies entirely on explicit, human-coded IF-THEN rules to make decisions.

• E) A model that requires continuous manual correction by a data scientist during runtime.

• F) A model that is exclusively used for translating text from one natural language to another.

• Correct Answer: C

• Explanation:

  • A is incorrect because training on labeled data with known outputs defines supervised learning.

  • B is incorrect because learning via environmental rewards and penalties describes reinforcement learning.

  • C is correct because unsupervised learning specifically deals with finding structures and patterns in data that has not been previously labeled or categorized.

  • D is incorrect because relying on explicit IF-THEN rules describes a traditional expert system, not a machine learning model.

  • E is incorrect because unsupervised models do not require continuous manual correction to function.

  • F is incorrect because while NLP might use unsupervised elements, unsupervised learning is a broad category used for clustering and anomaly detection, not exclusively for translation.

Question 2: Testing AI-Powered Applications When testing a conversational AI, which metric is most appropriate for evaluating the NLP model’s intent recognition accuracy?

• A) Mean Time to Recovery (MTTR).

• B) Cyclomatic Complexity.

• C) Precision, Recall, and F1-Score.

• D) The total number of concurrent users supported by the chat interface.

• E) Page load speed of the chatbot widget.

• F) The percentage of code coverage achieved by unit tests.

• Correct Answer: C

• Explanation:

  • A is incorrect because MTTR is a metric used for incident management and system reliability, not NLP accuracy.

  • B is incorrect because cyclomatic complexity measures the structural complexity of source code, not the accuracy of an AI model’s intent recognition.

  • C is correct because Precision, Recall, and F1-Score are the standard statistical metrics used to evaluate how accurately an NLP model categorizes and recognizes user intent.

  • D is incorrect because concurrent user capacity is a performance and load testing metric, not an NLP accuracy metric.

  • E is incorrect because page load speed relates to frontend performance, not the underlying machine learning model.

  • F is incorrect because code coverage measures how much of the source code is executed during testing, which does not indicate how well the AI understands human language.

Question 3: Specialized Topics and Industry Trends Which of the following techniques is most effective for identifying demographic bias during the testing of an AI-powered recruitment application?

• A) Executing automated regression tests on the user interface layout.

• B) Testing the model against a highly skewed dataset representing only the majority demographic.

• C) Utilizing metamorphic testing by swapping demographic attributes in resumes and verifying if the output changes.

• D) Increasing the server allocation to reduce the processing time of resume parsing.

• E) Conducting a static analysis of the HTML source code.

• F) Performing a standard SQL injection attack on the database.

• Correct Answer: C

• Explanation:

  • A is incorrect because UI layout testing checks visual elements, not the logic or bias of the underlying recruitment algorithm.

  • B is incorrect because testing with a skewed dataset will reinforce bias, not identify it.

  • C is correct because metamorphic testing is a proven AI testing technique where testers change a specific input (like gender or race on a resume) that should not affect the outcome. If the model’s prediction changes, bias is present.

  • D is incorrect because server allocation is a performance optimization and has no bearing on algorithmic bias.

  • E is incorrect because HTML static analysis checks for frontend syntax errors, not machine learning model fairness.

  • F is incorrect because SQL injection is a security testing technique, entirely unrelated to demographic bias in AI.

• Welcome to the Mock Exam Practice Tests Academy to help you prepare for your ISTQB® Certified Tester – AI Testing (CT-AI) course.

• You can retake the exams as many times as I have made them available.

• This is a huge original question bank.

• You get support from me as your instructor if you have questions.

• Each question has a detailed explanation.

• Mobile-compatible with the Udemy app.

I hope that by now you’re convinced! And there are a lot more questions inside the course.

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