This set tests how well you can tell the cloud service models (IaaS, PaaS, SaaS and FaaS) and deployment models (public, private, community, hybrid and multi-cloud) apart, and who secures what under the shared responsibility model. The questions use realistic scenarios, so they suit university exams, UGC NET, cloud certification preparation and interview rounds where you must map a requirement to the right model.
How to practise: read each question and tap the option you think is correct. You will see right away whether you got it, along with a short explanation, and your score is tracked at the bottom of the screen. This set has 18 questions.
Topics covered in this set
- IaaS, PaaS and SaaS responsibilities
- Function as a Service and cold starts
- Public, private and community clouds
- Hybrid cloud and cloud bursting
- Multi-cloud strategy
- Shared responsibility model
Cloud Computing MCQs with answers and explanations
Q1. In the IaaS model, who is normally responsible for patching the guest operating system of a virtual machine?
a) The cloud provider
b) The consumer
c) The hardware vendor
d) The internet service provider
Q2. A developer pushes source code and the platform automatically handles the runtime, OS, scaling and load balancing. Which service model is this?
a) IaaS
b) SaaS
c) PaaS
d) DaaS
Q3. Which of the following is an example of Software as a Service?
a) Amazon EC2
b) Google Compute Engine
c) Gmail
d) Azure Virtual Network
Q4. Which property most clearly distinguishes Function as a Service from a traditional PaaS?
a) Code runs as short-lived, event-triggered functions that scale to zero when idle
b) The consumer must manage the operating system
c) Virtual machines must be reserved in advance
d) It can only host SaaS products
Q5. When using a SaaS email product, which responsibility stays with the customer under the shared responsibility model?
a) Physical security of the data centre
b) Patching the hypervisor
c) Managing user accounts, access rights and the data users store
d) Maintaining network hardware
Q6. Several hospitals jointly operate cloud infrastructure built to meet the same healthcare compliance rules. Which deployment model is this?
a) Public cloud
b) Private cloud
c) Community cloud
d) Hybrid cloud
Q7. Running normal load on a private cloud and overflowing to a public cloud only during demand peaks is known as
a) Cloud bursting
b) SaaS federation
c) Lift and shift
d) Cold standby
Q8. A company uses AWS for compute and Google Cloud for analytics, with no private cloud involved. This arrangement is best called
a) Hybrid cloud
b) Multi-cloud
c) Community cloud
d) Private cloud
Q9. Which statement about a private cloud is correct?
a) It must be located on the organisation's own premises
b) It is provisioned for exclusive use by one organisation and may be hosted on or off premises
c) It is open to the general public
d) It cannot use virtualisation
Q10. Across IaaS, PaaS and SaaS, who is responsible for the physical security of the data centre?
a) The consumer
b) Shared equally
c) An external auditor
d) The provider
Q11. Which ordering correctly shows decreasing consumer control over the technology stack?
a) SaaS > PaaS > IaaS
b) IaaS > PaaS > SaaS
c) PaaS > IaaS > SaaS
d) IaaS > SaaS > PaaS
Q12. The extra latency seen when a serverless function is invoked after being idle, because a new execution environment must be initialised, is called
a) Warm pool
b) Throttling
c) Thrashing
d) Cold start
Q13. A managed relational database service where the provider handles engine patching and backups while the customer designs schemas and queries is usually classified as
a) Database as a Service, a form of PaaS
b) Bare-metal IaaS
c) An end-user SaaS application
d) On-premise hosting
Q14. A security team must install custom kernel modules and host-based agents on its servers. Which service model fits this requirement?
a) SaaS
b) FaaS
c) PaaS
d) IaaS
Q15. Which deployment model has infrastructure provisioned for open use by the general public and owned by a provider?
a) Public cloud
b) Private cloud
c) Community cloud
d) On-premise data centre
Q16. Under the shared responsibility model, security 'in' the cloud, such as configuring firewall rules and encrypting stored data on IaaS, is the responsibility of the
a) Provider
b) Customer
c) Regulator
d) Hardware manufacturer
Q17. A function configured with 512 MB of memory runs for 200 ms per invocation and is invoked 1 million times. How much compute is consumed in GB-seconds?
a) 10,000 GB-s
b) 1,000,000 GB-s
c) 50,000 GB-s
d) 100,000 GB-s
Q18. What is a main motivation for an organisation to adopt a multi-cloud strategy?
a) Reducing dependence on a single vendor and improving resilience
b) It is mandated by the NIST definition
c) It removes the need for networking
d) It reduces the range of skills the team needs
Quick revision notes
- IaaS: consumer manages OS, runtime, apps, data; provider manages hardware, network, hypervisor.
- PaaS: consumer manages apps and data only. SaaS: consumer manages data, users and configuration.
- FaaS: event-driven functions, scale to zero, billed per request and GB-seconds.
- GB-seconds = memory (GB) x duration (s) x invocations.
- Deployment models (NIST): public, private, community, hybrid. Multi-cloud = 2+ public providers.
- Hybrid cloud enables cloud bursting from private to public.
- Shared responsibility: provider secures OF the cloud, customer secures IN the cloud.
Frequently asked questions
What is the difference between IaaS, PaaS and SaaS?
IaaS rents virtual machines, storage and networks, leaving the OS and above to you. PaaS gives a managed platform where you only deploy code and data. SaaS delivers a finished application you simply use.
Is hybrid cloud the same as multi-cloud?
No. Hybrid cloud combines private infrastructure with at least one public cloud, connected so workloads or data can move between them. Multi-cloud means using multiple public providers and may or may not include a private cloud.
Is serverless the same as FaaS?
FaaS is the core of serverless computing, but serverless also includes managed services such as databases, queues and storage that scale automatically and bill per use. In both cases the developer does not manage servers.
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