- A
Azure App Service
Why wrong: Azure App Service can deploy containers, but it runs continuously and bills per hour (or per plan), not per second of actual runtime. It also requires a plan that is always running, which does not match the requirement to pay only for active processing minutes.
- B
Azure Container Instances
Azure Container Instances (ACI) is the correct choice. It allows you to run containers directly on Azure without managing VMs or orchestrators. ACI bills per second of container execution and has no active cost when the container is stopped, matching the pay-per-use requirement perfectly.
- C
Azure Virtual Machine Scale Sets
Why wrong: Azure Virtual Machine Scale Sets require you to manage virtual machines (even though they can be patched and scaled automatically). You pay for the underlying VMs regardless of whether the container is actively processing, and you must manage the container runtime environment. This does not meet the no-VM-management or pay-per-second requirements.
- D
Azure Kubernetes Service
Why wrong: Azure Kubernetes Service (AKS) is a managed Kubernetes orchestrator, but it still requires you to manage worker node VMs (even if Microsoft manages the control plane). You pay for the node VMs continuously, and there is additional operational overhead for the Kubernetes configuration. It is not serverless and does not offer per-second billing for container execution.
Quick Answer
Azure Container Instances is the correct choice because it enables you to run a containerized application without managing any virtual machines or container orchestrators, and its per-second billing model means you pay only for the time the container is actively running, with no cost when idle. This perfectly matches the requirement for a simple, single-container workload that processes data for a few minutes each hour. On the Microsoft Azure Fundamentals AZ-900 exam, this scenario tests your understanding of serverless compute options and their cost models, often contrasting ACI with services like Azure Kubernetes Service or Azure App Service. A common trap is selecting a service that requires ongoing management or charges for allocated resources even when idle. Remember the memory tip: “ACI = Always Charged for Intervals” — meaning you only pay for the exact seconds your container is in use, making it ideal for intermittent container workloads.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has a simple containerized web application that runs in a single container. The application processes a workload for a few minutes every hour and remains idle the rest of the time. The company wants to deploy the container in Azure without managing any virtual machines or container orchestrators. They also want to pay only for the time the container is actually running, with no cost when idle. Which Azure compute service should the company use?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Azure Container Instances
Azure Container Instances (ACI) is the correct choice because it allows you to run a containerized application without managing any underlying virtual machines or container orchestrators like Kubernetes. ACI supports a per-second billing model, meaning you only pay for the compute resources consumed while the container is actively running, and incur no cost when the container is stopped or idle. This aligns perfectly with the company's requirement of a simple, single-container workload that runs intermittently.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Azure App Service
Why it's wrong here
Azure App Service can deploy containers, but it runs continuously and bills per hour (or per plan), not per second of actual runtime. It also requires a plan that is always running, which does not match the requirement to pay only for active processing minutes.
- ✓
Azure Container Instances
Why this is correct
Azure Container Instances (ACI) is the correct choice. It allows you to run containers directly on Azure without managing VMs or orchestrators. ACI bills per second of container execution and has no active cost when the container is stopped, matching the pay-per-use requirement perfectly.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure Virtual Machine Scale Sets
Why it's wrong here
Azure Virtual Machine Scale Sets require you to manage virtual machines (even though they can be patched and scaled automatically). You pay for the underlying VMs regardless of whether the container is actively processing, and you must manage the container runtime environment. This does not meet the no-VM-management or pay-per-second requirements.
- ✗
Azure Kubernetes Service
Why it's wrong here
Azure Kubernetes Service (AKS) is a managed Kubernetes orchestrator, but it still requires you to manage worker node VMs (even if Microsoft manages the control plane). You pay for the node VMs continuously, and there is additional operational overhead for the Kubernetes configuration. It is not serverless and does not offer per-second billing for container execution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure App Service's container support with a serverless container service, not realizing that App Service still requires a continuously running plan (e.g., Basic, Standard) that incurs charges even when the container is idle.
Detailed technical explanation
How to think about this question
Under the hood, Azure Container Instances leverages a hypervisor-level isolation technology that launches containers directly on Azure infrastructure without the overhead of a full VM or orchestrator control plane. The per-second billing granularity is enabled by the container group lifecycle, where billing stops immediately upon container group termination, making it ideal for burstable or scheduled workloads. In a real-world scenario, this is commonly used for batch processing jobs, data transformation tasks, or CI/CD pipeline agents that run for short durations and then shut down completely.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Describe Azure architecture and services — study guide chapter
Learn the concepts, then practise the questions
- →
Describe Azure architecture and services practice questions
Targeted practice on this topic area only
- →
All AZ-900 questions
1,031 questions across all exam domains
- →
Microsoft Azure Fundamentals AZ-900 study guide
Full concept coverage aligned to exam objectives
- →
AZ-900 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related AZ-900 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Describe cloud concepts practice questions
Practise AZ-900 questions linked to Describe cloud concepts.
Describe Azure architecture and services practice questions
Practise AZ-900 questions linked to Describe Azure architecture and services.
Describe Azure management and governance practice questions
Practise AZ-900 questions linked to Describe Azure management and governance.
AZ-900 Azure services practice questions
Practise AZ-900 questions linked to AZ-900 Azure services.
AZ-900 pricing and support practice questions
Practise AZ-900 questions linked to AZ-900 pricing and support.
AZ-900 security and compliance practice questions
Practise AZ-900 questions linked to AZ-900 security and compliance.
AZ-900 governance practice questions
Practise AZ-900 questions linked to AZ-900 governance.
Practice this exam
Start a free AZ-900 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this AZ-900 question test?
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Container Instances — Azure Container Instances (ACI) is the correct choice because it allows you to run a containerized application without managing any underlying virtual machines or container orchestrators like Kubernetes. ACI supports a per-second billing model, meaning you only pay for the compute resources consumed while the container is actively running, and incur no cost when the container is stopped or idle. This aligns perfectly with the company's requirement of a simple, single-container workload that runs intermittently.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
3 more ways this is tested on AZ-900
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company wants to run a containerized application that responds to HTTP requests. They want to deploy it without managing any virtual machines or orchestration. Which Azure service is the simplest option?
medium- A.Azure Kubernetes Service
- ✓ B.Azure Container Instances
- C.Azure Virtual Machines
- D.Azure App Service
Why B: Azure Container Instances (ACI) is the simplest option because it allows you to run a containerized application directly in Azure without managing any underlying virtual machines or orchestration. ACI automatically starts the container, assigns a public IP address, and handles HTTP requests on port 80/443, making it ideal for event-driven or stateless workloads that need rapid deployment.
Variation 2. A company needs to run a containerized application without managing any virtual machines or cluster orchestration. Which Azure service is best suited for this?
medium- ✓ A.Azure Container Instances
- B.Azure Kubernetes Service
- C.Azure App Service
- D.Azure Batch
Why A: Azure Container Instances (ACI) is the correct choice because it allows you to run a containerized application directly on Azure without provisioning or managing any underlying virtual machines, cluster orchestration, or scheduling. ACI provides a serverless, per-second billing model, making it ideal for simple, isolated containers that do not require the complexity of a full orchestration platform.
Variation 3. A company wants to run a containerized application quickly without managing any virtual machines or orchestration infrastructure. They just need to start a container and have it run. Which Azure service is best suited for this?
medium- ✓ A.Azure Container Instances
- B.Azure Kubernetes Service
- C.Azure App Service
- D.Azure Functions
Why A: Azure Container Instances (ACI) is the correct choice because it provides a serverless container platform that allows you to run a container directly without managing any underlying virtual machines or orchestration infrastructure. You simply specify the container image and resource requirements, and ACI launches the container in seconds, making it ideal for quick, isolated container workloads.
Last reviewed: Jun 11, 2026
This AZ-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-900 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.