PCD Building and testing applications Practice Question
This PCD practice question tests your understanding of building and testing applications. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO statements are true about Cloud Functions? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cloud Functions automatically scale based on the number of incoming events
Cloud Functions automatically scale horizontally based on the number of incoming events, such as HTTP requests or Pub/Sub messages. The platform handles this scaling transparently, spinning up new function instances as needed to handle concurrent invocations, and scaling down to zero when idle. This is a key serverless characteristic that eliminates the need for manual capacity planning.
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.
✓
Cloud Functions automatically scale based on the number of incoming events
Why this is correct
Cloud Functions scale out to handle multiple events concurrently.
Related concept
Read the scenario before looking for a memorised answer.
✗
Cloud Functions require you to provide a container image from Container Registry
Why it's wrong here
Cloud Functions use runtimes; you don't provide container images.
✓
Cloud Functions are stateless by design
Why this is correct
Each invocation is independent; no state is preserved between invocations unless using external storage.
Related concept
Read the scenario before looking for a memorised answer.
✗
Cloud Functions can only be triggered by HTTP requests
Why it's wrong here
Cloud Functions supports many triggers including Pub/Sub, Cloud Storage, etc.
✗
Cloud Functions have a maximum execution timeout of 9 minutes for all runtimes
Why it's wrong here
2nd gen supports longer timeouts (up to 60 min).
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that Cloud Functions are limited to HTTP triggers or that the 9-minute timeout applies to all runtimes and trigger types, when in fact event-driven functions have a significantly longer timeout and multiple trigger options exist.
Detailed technical explanation
How to think about this question
Under the hood, Cloud Functions uses a container-based execution environment where each function instance is isolated. The platform employs a 'cold start' mechanism where a new container is provisioned for a function that hasn't been invoked recently; subsequent invocations reuse a warm container. For event-driven functions, the platform integrates with Cloud Pub/Sub's at-least-once delivery semantics, ensuring that events are retried if the function fails, up to the configured timeout (default 60 seconds, max 60 minutes for 2nd gen).
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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.
Building and testing applications — This question tests Building and testing applications — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud Functions automatically scale based on the number of incoming events — Cloud Functions automatically scale horizontally based on the number of incoming events, such as HTTP requests or Pub/Sub messages. The platform handles this scaling transparently, spinning up new function instances as needed to handle concurrent invocations, and scaling down to zero when idle. This is a key serverless characteristic that eliminates the need for manual capacity planning.
What should I do if I get this PCD 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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This PCD practice question is part of Courseiva's free Google Cloud 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 PCD exam.
Question Discussion
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