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Free ISTQB CT-AI Sample Questions
Question 1
You have access to the training data that was used to train an AI-based system. You can review thisinformation and use it as a guideline when creating your tests. What type of characteristic is this?
A. Autonomy B. Explorability C. Transparency D. Accessibility
Answer: C Explanation:AI-based systems can sometimes behave like black boxes, where the internal decision-makingprocess is unclear. Transparency refers to the ability to inspect and understand the training data,algorithms, and decision-making process of the AI system.Why is Option C Correct?Transparency ensures that testers and stakeholders can review how an AI system was trained.Access to training data is a key factor in transparency because it allows testers to analyze biases,completeness, and representativeness of the dataset.Transparency is an essential characteristic of explainable AI (XAI).Having access to training data means that testers can investigate how data influences AI behavior.Regulatory and ethical AI guidelines emphasize transparency.Many AI ethics frameworks, such as GDPR and Trustworthy AI guidelines, recommend transparencyto ensure fair and explainable AI decision-making.Why Other Options are Incorrect?(A) Autonomy â ŒAutonomy refers to an AI systems ability to make decisions independently without humanintervention. However, having access to training data does not relate to autonomy, which is moreabout self-learning and decision-making without human control.(B) Explorability â ŒExplorability refers to the ability to test AI systems interactively to understand their behavior, but itdoes not directly relate to accessing training data.(D) Accessibility â ŒAccessibility refers to the ease with which people can use the system, not the ability to inspect thetraining data.Reference from ISTQB Certified Tester AI Testing Study GuideTransparency is the ease with which the training data and algorithm used to generate a model can be understood."Transparency: This is considered to be the ease with which the algorithm and training data used to generate the model can be determined."Thus, option C is the correct answer, as transparency involves access to training data, allowing testers to understand AI decision-making processes.
Question 2
A transportation company operates three types of delivery vehicles in its fleet. The vehicles operateat different speeds (slow, medium, and fast). The transportation company is attempting to optimizescheduling and has created an AI-based program to plan routes for its vehicles using records from themedium-speed vehicle traveling to selected destinations. The test team uses this data inmetamorphic testing to test the accuracy of the estimated travel times created by the AI routeplanner with the actual routes and times.Which of the following describes the next phase of metamorphic testing?
A. The team tests the time required for the fast and slow vehicles to travel the same route as themedium vehicle. Then, by calculating the speed difference, they then predict how much faster orslower the vehicles will travel. That information is then used to verify that the arrival time of thevehicles meets the expected result. B. The team decomposes each route into the relevant components that affect the travel time such astraffic density and vehicle power. The team then uses statistical analysis to characterize the influenceof each component to calculate the fast and slow vehicle route times. C. The team uses an AI system to select the most dissimilar routes. With this information, any of theAI routes can be metaphorically transformed into a fast or slow route. D. The team uses the same AI route planner to create routes that are longer and shorter but followthe same track. Finally, by driving the fast vehicles on the long routes and slow vehicles on the shortroutes and vice versa, the AI system will have enough information to infer travel times for all vehicleson all routes.
Answer: A Explanation:Metamorphic Testing (MT) is a testing technique that verifies AI-based systems by generating followuptest cases based on existing test cases. These follow-up test cases adhere to a MetamorphicRelation (MR), ensuring that if the system is functioning correctly, changes in input should result inpredictable changes in output.Why Option A is Correct?Metamorphic testing works by transforming source test cases into follow-up test casesHere, the source test case involves testing the medium-speed vehicles travel time.The follow-up test cases are derived by extrapolating travel times for fast and slow vehicles usingpredictable relationships based on speed differences.MR states that modifying input should result in a predictable change in outputSince the speed of the vehicle is a known factor, it is possible to predict the new arrival times andverify whether they follow expected trends.This is a direct application of metamorphic testing principlesIn route optimization systems, metamorphic testing often applies transformations to speed, distance,or conditions to verify expected outcomes.Why Other Options are Incorrect?(B) Decomposing each route into traffic density and vehicle power â ŒWhile useful for statistical analysis, this approach does not generate follow-up test cases based on adefined metamorphic relation (MR).(C) Selecting dissimilar routes and transforming them into a fast or slow route â ŒThis does not follow metamorphic testing principles, which require predictable transformations.(D) Running fast vehicles on long routes and slow vehicles on short routes â ŒThis method does not maintain a controlled MR and introduces too many uncontrolled variables.Reference from ISTQB Certified Tester AI Testing Study GuideMetamorphic testing generates follow-up test cases based on a source test case."MT is a technique aimed at generating test cases which are based on a source test case that haspassed. One or more follow-up test cases are generated by changing (metamorphizing) the sourcetest case based on a metamorphic relation (MR)."MT has been used for testing route optimization AI systems."In the area of AI, MT has been used for testing image recognition, search engines, routeoptimization and voice recognition, among others."Thus, option A is the correct answer, as it aligns with the principles of metamorphic testing bymodifying input speeds and verifying expected results.
Question 3
A mobile app start-up company is implementing an AI-based chat assistant for e-commercecustomers. In the process of planning the testing, the team realizes that the specifications areinsufficient.Which testing approach should be used to test this system?
A. Exploratory testing B. Static analysis C. Equivalence partitioning D. State transition testing
Answer: A Explanation:When testing an AI-based chat assistant for e-commerce customers, the lack of sufficientspecifications makes it difficult to use structured test techniques. The ISTQB CT-AI Syllabusrecommends exploratory testing in such cases:Why Exploratory Testing?Exploratory testing is useful when specifications are incomplete or unclear.AI-based systems, particularly those using natural language processing (NLP), may not behavedeterministically, making scripted test cases ineffective.The tester interacts dynamically with the system, identifying unexpected behaviors not documentedin the specification .Analysis of Answer Choices:A (Exploratory testing) → Correct, as it is the best approach when specifications are incomplete.B (Static analysis) → Incorrect, as static analysis checks code without execution, which is not helpfulfor AI chatbots.C (Equivalence partitioning) → Incorrect, as this technique requires well-defined inputs and outputs,which are missing due to insufficient specifications.D (State transition testing) → Incorrect, as state-based testing requires knowledge of valid and invalidtransitions, which is difficult with a chatbot lacking a clear specification .Thus, Option A is the correct answer, as exploratory testing is the best approach when dealing withinsufficient specifications in AI-based systems.Certified Tester AI Testing Study Guide Reference: ISTQB CT-AI Syllabus v1.0, Section 7.7 (Selecting a Test Approach for an ML System)ISTQB CT-AI Syllabus v1.0, Section 9.6 (Experience-Based Testing of AI-Based Systems)
Question 4
Which of the following is correct regarding the layers of a deep neural network?
A. There is only an input and output layer B. There is at least one internal hidden layer C. There must be a minimum of five total layers to be considered deep D. The output layer is not connected with the other layers to maintain integrity
Answer: B Explanation:A deep neural network (DNN) is a type of artificial neural network that consists of multiple layersbetween the input and output layers. The ISTQB Certified Tester AI Testing (CT-AI) Syllabus outlinesthe following characteristics of a DNN:Structure of a Deep Neural Network:A DNN comprises at least three types of layers:Input layer: Receives the input data.Hidden layers: Perform complex feature extraction and transformations.Output layer: Produces the final prediction or classification .Analysis of Answer Choices:A (Only input and output layers) → Incorrect, as a DNN must have at least one hidden layer.B (At least one internal hidden layer) → Correct, as a neural network must have hidden layers to beconsidered deep.C (Minimum of five layers required) → Incorrect, as there is no strict definition that requires at leastfive layers.D (Output layer is not connected to other layers) → Incorrect, as the output layer must be connectedto the hidden layers .Thus, Option B is the correct answer, as a deep neural network must have at least one hidden layer.Certified Tester AI Testing Study Guide Reference:ISTQB CT-AI Syllabus v1.0, Section 6.1 (Neural Networks and Deep Neural Networks)ISTQB CT-AI Syllabus v1.0, Section 6.2 (Structure of Deep Neural Networks) .
Question 5
When verifying that an autonomous AI-based system is acting appropriately, which of the followingare MOST important to include?
A. Test cases to verify that the system automatically confirms the correct classification of trainingdata B. Test cases to detect the system appropriately automating its data input C. Test cases to detect the system prompting for unnecessary human intervention D. Test cases to verify that the system automatically suppresses invalid output data
Answer: C Explanation:When verifying autonomous AI-based systems, a critical aspect is ensuring that they maintain anappropriate level of autonomy while only requesting human intervention when necessary. If an AIsystem unnecessarily asks for human input, it defeats the purpose of autonomy and can:Slow down operations.Reduce trust in the system.Indicate improper confidence thresholds in decision-making.This is particularly crucial in autonomous vehicles, AI-driven financial trading, and robotic processautomation, where excessive human intervention would hinder performance.Why are the other options incorrect?A . Test cases to verify that the system automatically confirms the correct classification of trainingdata → This is relevant for verifying training consistency but not for autonomy validation.B . Test cases to detect the system appropriately automating its data input → While relevant, dataautomation does not directly address the verification of autonomy.D . Test cases to verify that the system automatically suppresses invalid output data → This focuseson output filtering rather than decision-making autonomy.Thus, the most critical test case for verifying autonomous AI-based systems is ensuring that it doesnot unnecessarily request human intervention.Reference from ISTQB Certified Tester AI Testing Study Guide:Section: Section 8.2 - Testing Autonomous AI-Based Systems states that it is crucial to test whether the systemrequests human intervention only when necessary and does not disrupt autonomy .
Question 6
A beer company is trying to understand how much recognition its logo has in the market. It plans todo that by monitoring images on various social media platforms using a pre-trained neural networkfor logo detection. This particular model has been trained by looking for words, as well as matchingcolors on social media images. The company logo has a big word across the middle with a bold blueand magenta border.Which associated risk is most likely to occur when using this pre-trained model?
A. There is no risk, as the model has already been trained B. Insufficient function; the model was not trained to check for colors or words C. Improper data preparation D. Inherited bias: the model could have inherited unknown defects
Answer: D Explanation:A major risk when using a pre-trained neural network for logo detection is that it may inherit biasesand defects from the original dataset and training process. This means that the model couldmisidentify or fail to recognize certain logos due to:Differences in data preparation: The original training data may have used a different preprocessingmethod than the new dataset, leading to inconsistencies.Limited transparency: The exact details of the dataset and biases within it may not be known, whichcan cause unexpected behavior.Bias in logo detection: If the model was trained on a dataset with certain color or text preferences, itmay disproportionately misidentify logos with similar characteristics.This inherited bias can result in:False Positives: Recognizing other brand logos as the beer company's logo.False Negatives: Failing to detect the actual logo when variations occur (e.g., different lighting orpartial visibility).Algorithmic Bias: The model may favor certain shapes or color contrasts due to biased training data.Thus, the most appropriate risk associated with using this pre-trained model is inherited bias.Reference from ISTQB Certified Tester AI Testing Study Guide:Section: Section 1.8.3 - Risks of Using Pre-Trained Models and Transfer Learning explains how pre-trainedmodels may inherit biases and undocumented defects that affect performance in a newenvironment .
Question 7
A local business has a mail pickup/delivery robot for their office. The robot currently uses a track tomove between pickup/drop off locations. When it arrives at a destination, the robot stops to allow ahuman to remove or deposit mail.The office has decided to upgrade the robot to include AI capabilities that allow the robot to performits duties without a track, without running into obstacles, and without human intervention.The test team is creating a list of new and previously established test objectives and acceptancecriteria to be used in the testing of the robot upgrade. Which of the following test objectives will testan AI quality characteristic for this system?
A. The robot must evolve to optimize its routing B. The robot must recharge for no more than six hours a day C. The robot must record the time of each delivery which is compiled into a report D. The robot must complete 99.99% of its deliveries each day
Answer: A Explanation:AI-based systems have specific quality characteristics, including evolution, autonomy, andadaptability. A test objective that evaluates whether an AI system evolves to improve performanceover time directly aligns with AI quality characteristics .Explanation of Answer Choices:Option A: The robot must evolve to optimize its routing.Correct. Evolution is an AI quality characteristic that ensures the system learns from past experiencesand adapts to improve efficiency .Option B: The robot must recharge for no more than six hours a day.Incorrect. This is an operational constraint rather than an AI-specific quality characteristic .Option C: The robot must record the time of each delivery which is compiled into a report.Incorrect. Logging data does not relate to AI quality characteristics like adaptability or autonomy .Option D: The robot must complete 99.99% of its deliveries each day.Incorrect. This is a performance target rather than an AI quality characteristic .ISTQB CT-AI Syllabus Reference:Evolution as an AI Quality Characteristic: "Check how well the system learns from its own experience.Check how well the system copes when the profile of data changes (i.e., concept drift)" .Thus, Option A is the best choice as it directly tests an AI quality characteristic (evolution) in theupgraded autonomous robot.
Question 8
Which of the following is a dataset issue that can be resolved using pre-processing?
A. Insufficient data B. Invalid data C. Wanted outliers D. Numbers stored as strings
Answer: D Explanation:Pre-processing is an essential step in data preparation that ensures data is clean, formatted correctly,and structured for effective machine learning (ML) model training. One common issue that can beresolved during pre-processing is numbers stored as strings.Explanation of Answer Choices:Option A: Insufficient dataIncorrect. Pre-processing cannot resolve insufficient data. If data is lacking, techniques like dataaugmentation or external data collection are needed .Option B: Invalid dataIncorrect. While pre-processing can identify and handle some forms of invalid data (e.g., missingvalues, duplicate entries), it does not resolve all invalid data issues. Some cases may require domainexpertise to determine validity .Option C: Wanted outliersIncorrect. Pre-processing usually focuses on handling unwanted outliers. Wanted outliers may needto be preserved, which is more of a data selection decision rather than pre-processing .Option D: Numbers stored as stringsCorrect. One of the key functions of data pre-processing is data transformation, which includesconverting incorrectly formatted data types, such as numbers stored as strings, into their correctnumerical format .ISTQB CT-AI Syllabus Reference:Data Pre-Processing Steps: "Transformation: The format of the given data is changed (e.g., breakingan address held as a string into its constituent parts, dropping a field holding a random identifier,converting categorical data into numerical data, changing image formats)" .
Question 9
Which of the following characteristics of AI-based systems make it more difficult to ensure they aresafe?
A. Simplicity B. Sustainability C. Non-determinism D. Robustness
Answer: C Explanation:AI-based systems often exhibit non-deterministic behavior, meaning they do not always produce thesame output for the same input. This makes ensuring safety more difficult, as the system's behaviorcan change based on new data, environmental factors, or updates .Why Non-determinism Affects Safety:In traditional software, the same input always produces the same output.In AI systems, outputs vary probabilistically depending on learned patterns and weights.This unpredictability makes it harder to verify correctness, reliability, and safety, especially in criticaldomains like autonomous vehicles, medical AI, and industrial automation.Why Other Options Are Incorrect:A (Simplicity): AI-based systems are typically complex, not simple, which contributes to safetychallenges .B (Sustainability): While sustainability is an important AI consideration, it does not directly affectsafety .D (Robustness): Lack of robustness can make AI systems unsafe, but non-determinism is the primaryissue that complicates safety verification .Supporting Reference from ISTQB Certified Tester AI Testing Study Guide:ISTQB CT-AI Syllabus (Section 2.8: Safety and AI)"The characteristics of AI-based systems that make it more difficult to ensure they are safe include:complexity, non-determinism, probabilistic nature, self-learning, lack of transparency,interpretability and explainability, lack of robustness" .Conclusion:Since non-determinism makes AI behavior unpredictable, complicating safety assurance, the correctanswer is C.
Question 10
Which of the following is a technique used in machine learning?
A. Decision trees B. Equivalence partitioning C. Boundary value analysis D. Decision tables
Answer: A Explanation:Decision trees are a widely used machine learning (ML) technique that falls under supervisedlearning. They are used for both classification and regression tasks and are popular due to theirinterpretability and effectiveness.How Decision Trees Work:The model splits the dataset into branches based on feature conditions.It continues to divide the data until each subset belongs to a single category (classification) orpredicts a continuous value (regression).The final result is a tree structure where decisions are made at nodes, and predictions are given atleaf nodes.Common Applications of Decision Trees:Fraud detectionMedical diagnosisCustomer segmentationRecommendation systemsWhy Other Options Are Incorrect:B (Equivalence Partitioning): This is a software testing technique, not a machine learning method. Itis used to divide input data into partitions to reduce test cases while maintaining coverage .C (Boundary Value Analysis): Another software testing technique, used to check edge cases aroundinput boundaries .D (Decision Tables): A structured testing technique used to validate business rules and logic, not amachine learning method .Supporting Reference from ISTQB Certified Tester AI Testing Study Guide:ISTQB CT-AI Syllabus (Section 3.1: Forms of Machine Learning - Decision Trees)"Decision trees are used in classification and regression models and are fundamental ML algorithms" .Conclusion: Since decision trees are a core technique in machine learning, while the other options are softwaretesting techniques, the correct answer is A.
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