- A
Rapid elasticity
Why wrong: Rapid elasticity refers to the ability to quickly scale resources up or down based on demand. While Azure supports this, the billing model described is not about scaling but about metering usage.
- B
Resource pooling
Why wrong: Resource pooling describes the provider serving multiple customers from shared physical resources. The scenario focuses on how charges are calculated, not on multi-tenancy.
- C
Measured service
Measured service is correct. Cloud providers track resource usage and bill accordingly, enabling pay-as-you-go pricing. The invoice based on VM hours and storage GB exemplifies this characteristic.
- D
On-demand self-service
Why wrong: On-demand self-service allows users to provision resources without human intervention. Although Azure offers this, the billing model itself is separate and best described as measured service.
AZ-900 Describe cloud concepts Practice Question
This AZ-900 practice question tests your understanding of describe cloud concepts. 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 uses Azure to host its virtual machines and storage. The company receives a monthly invoice that charges based on the exact number of virtual machine hours and gigabytes of storage consumed. No upfront payment is required. Which characteristic of cloud computing does this billing model represent?
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
Measured service
The billing model charges based on exact virtual machine hours and gigabytes of storage consumed, with no upfront payment. This directly reflects the measured service characteristic of cloud computing, where resource usage is metered, monitored, and billed according to consumption. Azure tracks usage metrics (e.g., VM runtime in hours, storage in GB-months) via its meters and generates invoices based on these precise measurements.
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.
- ✗
Rapid elasticity
Why it's wrong here
Rapid elasticity refers to the ability to quickly scale resources up or down based on demand. While Azure supports this, the billing model described is not about scaling but about metering usage.
- ✗
Resource pooling
Why it's wrong here
Resource pooling describes the provider serving multiple customers from shared physical resources. The scenario focuses on how charges are calculated, not on multi-tenancy.
- ✓
Measured service
Why this is correct
Measured service is correct. Cloud providers track resource usage and bill accordingly, enabling pay-as-you-go pricing. The invoice based on VM hours and storage GB exemplifies this characteristic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
On-demand self-service
Why it's wrong here
On-demand self-service allows users to provision resources without human intervention. Although Azure offers this, the billing model itself is separate and best described as measured service.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse measured service with on-demand self-service, because both involve user-driven actions, but measured service specifically refers to the metering and billing of consumed resources, not the ability to provision them without manual intervention.
Trap categories for this question
Scenario analysis trap
Resource pooling describes the provider serving multiple customers from shared physical resources. The scenario focuses on how charges are calculated, not on multi-tenancy.
Detailed technical explanation
How to think about this question
Azure uses a metering subsystem that tracks resource consumption at a granular level, such as per-second VM billing for certain instances and per-GB-month for storage. The measured service model relies on telemetry data collected by Azure's billing meters, which are aggregated and reported to the Azure Billing API. In a real-world scenario, a company running VMs for only 10 hours a month pays only for those 10 hours, not a fixed monthly fee, demonstrating the pay-as-you-go nature of measured service.
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.
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FAQ
Questions learners often ask
What does this AZ-900 question test?
Describe cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Measured service — The billing model charges based on exact virtual machine hours and gigabytes of storage consumed, with no upfront payment. This directly reflects the measured service characteristic of cloud computing, where resource usage is metered, monitored, and billed according to consumption. Azure tracks usage metrics (e.g., VM runtime in hours, storage in GB-months) via its meters and generates invoices based on these precise measurements.
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.
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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.
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