AZ-900 Questions 81-90: Cloud Concepts and Service Model Review

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AZ-900Questions 81-90Original PracticeAnswers Hidden

AZ-900 Questions 81-90: Cloud Concepts and Service Model Review

Continue the AZ-900 practice bank with 10 original exam-style questions focused on cloud fundamentals, economics, and service models. Choose your answer first, then reveal the explanation.

Series position: This continues the AZ-900 sequence after the previous 10-question batch. The goal is a complete, reviewable Microsoft Azure Fundamentals practice bank from Questions 1-100.
Exam code
AZ-900
Question range
81-90
Format
Single-best-answer practice
Status
Original questions, source-grounded
Practice mode: Answers are hidden by default. Decide on A, B, C, or D before opening the reveal panel.

Questions

Question 81

Single answerCapEx vs OpEx
Moving from buying datacenter hardware upfront to paying monthly for cloud usage is an example of shifting from what to what?
  • A. Capital expenditure to operational expenditure
  • B. Operational expenditure to capital expenditure
  • C. Availability to scalability
  • D. Identity to networking
Reveal answer and explanation
Correct answer: A. Capital expenditure to operational expenditure
Cloud consumption commonly shifts spending from upfront capital expenditure to ongoing operational expenditure.
Why the others are wrong: The other choices do not describe the cloud spending model shift.

Objective: CapEx vs OpEx.

Question 82

Single answerConsumption pricing
Which statement best describes consumption-based pricing?
  • A. You pay for what you use
  • B. You always pay a fixed datacenter purchase price
  • C. You cannot scale resources down
  • D. You must own the physical servers
Reveal answer and explanation
Correct answer: A. You pay for what you use
Consumption-based pricing charges based on actual resource usage.
Why the others are wrong: The other choices describe traditional ownership or incorrect limitations.

Objective: Consumption pricing.

Question 83

Single answerIaaS
A company deploys Azure virtual machines and manages the operating system. Which cloud service model is this?
  • A. Infrastructure as a service
  • B. Platform as a service
  • C. Software as a service
  • D. Function as a legal service
Reveal answer and explanation
Correct answer: A. Infrastructure as a service
Virtual machines are a common IaaS offering; the customer manages the OS and applications.
Why the others are wrong: PaaS abstracts more platform management, SaaS provides complete software, and the last option is not a service model.

Objective: IaaS.

Question 84

Single answerPaaS
Developers deploy code to Azure App Service and do not manage the underlying OS. Which service model is this?
  • A. Platform as a service
  • B. Infrastructure as a service
  • C. Software as a service
  • D. Private cloud only
Reveal answer and explanation
Correct answer: A. Platform as a service
App Service is PaaS because it provides a managed application hosting platform.
Why the others are wrong: IaaS gives more infrastructure control, SaaS is complete software, and private cloud is a deployment model.

Objective: PaaS.

Question 85

Single answerSaaS
Users access Microsoft 365 email through a browser and do not manage servers, runtime, or application code. Which model is this?
  • A. Software as a service
  • B. Infrastructure as a service
  • C. Platform as a service
  • D. Hybrid networking
Reveal answer and explanation
Correct answer: A. Software as a service
Microsoft 365 is SaaS: users consume the software while the provider manages the application and platform.
Why the others are wrong: The other service models require more customer management or describe networking.

Objective: SaaS.

Question 86

Single answerPublic cloud
A startup runs workloads on infrastructure owned and operated by Microsoft and shared across many customers with isolation. Which deployment model is this?
  • A. Public cloud
  • B. Private cloud
  • C. On-premises only
  • D. Disconnected cloud only
Reveal answer and explanation
Correct answer: A. Public cloud
Azure public cloud is operated by Microsoft and used by many customers with logical isolation.
Why the others are wrong: Private cloud is dedicated to one organization; on-premises and disconnected are not public cloud.

Objective: Public cloud.

Question 87

Single answerScalability
An API needs the ability to add more instances as demand grows. Which cloud concept is this?
  • A. Scalability
  • B. Compliance boundary
  • C. Data residency
  • D. Manual patching
Reveal answer and explanation
Correct answer: A. Scalability
Scalability is the ability to increase capacity to meet demand.
Why the others are wrong: The other terms do not describe adding capacity.

Objective: Scalability.

Question 88

Single answerHigh availability
A service is designed to remain accessible even when a component fails. Which concept is being described?
  • A. High availability
  • B. Single point of failure
  • C. Data exfiltration
  • D. CapEx
Reveal answer and explanation
Correct answer: A. High availability
High availability focuses on keeping services available despite failures.
Why the others are wrong: The other options are failure risk, security incident, or spending category.

Objective: High availability.

Question 89

Single answerDisaster recovery
A company plans how to restore service in another region after a major regional outage. Which concept is this?
  • A. Disaster recovery
  • B. Vertical scaling only
  • C. Tagging
  • D. Identity federation only
Reveal answer and explanation
Correct answer: A. Disaster recovery
Disaster recovery is the process and design for recovering from major outages or disasters.
Why the others are wrong: Scaling, tagging, and federation do not fully describe regional recovery planning.

Objective: Disaster recovery.

Question 90

Single answerAgility
A developer creates a test environment in minutes and deletes it when finished. Which cloud benefit is this?
  • A. Agility
  • B. Manual procurement delay
  • C. Fixed capacity
  • D. Physical rack installation
Reveal answer and explanation
Correct answer: A. Agility
Cloud agility lets teams rapidly provision and remove resources.
Why the others are wrong: The other options describe slower or fixed traditional approaches.

Objective: Agility.

Answer key

Reveal full answer key
QuestionCorrect answerObjective area
81ACapEx vs OpEx
82AConsumption pricing
83AIaaS
84APaaS
85ASaaS
86APublic cloud
87AScalability
88AHigh availability
89ADisaster recovery
90AAgility
Exam tip: AZ-900 questions usually reward the simplest Azure service or concept that exactly matches the requirement. Watch for distractors that are real services but solve a different problem.
Next: Finish with AZ-900 Questions 91-100 for the final mixed readiness set.

Sources

📚 More questions from: AZ-900: Microsoft Azure Fundamentals

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