Google Analytics GA4 2025 — 35 Q&A Complete Study Guide
Verified Answers
Series:
CrashCourses Professional Study Series
Author:
Dr Z. Moomba, MBChB, MRCPsych | BethelWellness Ltd
Exam Target:
Google Analytics GA4
Year:
2025/2026
Format:
35 Questions with Verified Answers and Rationales
>
Author's Note:
This document is an original work produced for the CrashCourses Professional Study Series.
Clinical questions and professional scenarios were composed by Dr Z. Moomba based on current
exam objectives, published guidelines, and evidence-based sources (2024–2025). All patient
names, ages, and case details are fictional. Any resemblance to existing published Q&A banks is
coincidental. For personal study use only — not for reproduction or redistribution.
SECTION A — FOUNDATIONS
Question 1
A digital marketing agency is onboarding a new e-commerce client who previously relied entirely
on Universal Analytics (UA). The lead data architect is explaining the fundamental difference in
data collection between UA and Google Analytics 4 (GA4). Which of the following accurately
describes the foundational data model of GA4?
A) It uses a session-based model where hits are categorised into pageviews, events, and
transactions.
B) It uses an event-based model where every user interaction is processed as a standalone event
with associated parameters.
,C) It relies strictly on cookie-based tracking to group pageviews into 30-minute sessions.
D) It utilises a hybrid model that prioritises bounce rate calculations before processing custom
events.
Answer: B
Rationale:
a) GA4 is built entirely on an event-based data model, meaning everything (pageviews, clicks,
purchases) is tracked as an event with flexible parameters.
b) The distinguishing feature is the abandonment of UA's "hit types" (pageview, social, timing) in
favour of a unified event architecture that provides better cross-platform (app and web)
consistency.
c) Option A is incorrect as it describes the obsolete Universal Analytics session-based model.
d) Examiner Pearl: Moving to an event-based model allows for highly customisable data collection,
where parameters add context (e.g., `page_location`, `link_url`) to every discrete user action.
[Google Analytics 4 Architecture Guidelines 2025]
Question 2
An enterprise retail brand has a website, an iOS app, and an Android app. The analytics team
wants to unify user journeys across all three platforms into a single reporting view to understand
cross-device purchasing behaviour. How should the GA4 property be structured to achieve this?
A) Create three separate GA4 properties and link them using a Roll-Up Property.
B) Create one GA4 property and set up three separate Data Streams within it.
C) Create one GA4 property and use different Measurement IDs for each page section.
D) Set up Universal Analytics for the website and Firebase Analytics for the apps, then merge
them in Looker Studio.
Answer: B
Rationale:
a) GA4 is designed for unified App + Web tracking. To track multiple platforms for the same
business, you create a single property with multiple Data Streams (one for Web, one for iOS, one
for Android).
b) This setup ensures that cross-device tracking, user deduplication, and predictive metrics are
calculated cohesively across the entire customer journey.
c) Option A is incorrect because creating separate properties fractures the data, defeating the
purpose of GA4's unified architecture. Roll-up properties are a legacy Analytics 360 concept that
, is handled differently in GA4.
d) Examiner Pearl: Always use a single GA4 property with multiple data streams when the apps
and website represent the same product or user journey; this enables unified user modeling. [GA4
Property Structuring Best Practices 2025]
Question 3
A junior web developer is tasked with deploying the GA4 base code directly onto a client's static
HTML website without using Google Tag Manager. They are looking for the unique identifier to
ensure data is sent to the correct property. Which format represents a GA4 Web Data Stream
Measurement ID?
A) UA-123456789-1
B) AW-987654321
C) G-ABC123XYZ9
D) GTM-N789XYZ
Answer: C
Rationale:
a) A GA4 Web Data Stream is uniquely identified by a Measurement ID that strictly follows the
format starting with "G-".
b) This ID is required when configuring the Google tag (`gtag.js`) to route the event stream to the
correct analytics property.
c) Option A is incorrect as "UA-" denotes legacy Universal Analytics. Option B ("AW-") is for
Google Ads, and Option D ("GTM-") is a Google Tag Manager container ID.
d) Examiner Pearl: The Measurement ID (G-) is specific to Web data streams; Firebase apps use a
Firebase App ID instead. [Google Analytics 4 Implementation Guide 2025]
Question 4
A marketing analyst is testing a new custom event (`generate_lead`) on a staging website. They
have fired the event multiple times but do not want to wait 24 hours for the standard reports to
update. Which native GA4 feature provides real-time validation of event firing and parameter
collection?
A) The Realtime Report exclusively.
B) The DebugView, accessed by enabling the `debug_mode` parameter or using Google Tag
Assistant.
Verified Answers
Series:
CrashCourses Professional Study Series
Author:
Dr Z. Moomba, MBChB, MRCPsych | BethelWellness Ltd
Exam Target:
Google Analytics GA4
Year:
2025/2026
Format:
35 Questions with Verified Answers and Rationales
>
Author's Note:
This document is an original work produced for the CrashCourses Professional Study Series.
Clinical questions and professional scenarios were composed by Dr Z. Moomba based on current
exam objectives, published guidelines, and evidence-based sources (2024–2025). All patient
names, ages, and case details are fictional. Any resemblance to existing published Q&A banks is
coincidental. For personal study use only — not for reproduction or redistribution.
SECTION A — FOUNDATIONS
Question 1
A digital marketing agency is onboarding a new e-commerce client who previously relied entirely
on Universal Analytics (UA). The lead data architect is explaining the fundamental difference in
data collection between UA and Google Analytics 4 (GA4). Which of the following accurately
describes the foundational data model of GA4?
A) It uses a session-based model where hits are categorised into pageviews, events, and
transactions.
B) It uses an event-based model where every user interaction is processed as a standalone event
with associated parameters.
,C) It relies strictly on cookie-based tracking to group pageviews into 30-minute sessions.
D) It utilises a hybrid model that prioritises bounce rate calculations before processing custom
events.
Answer: B
Rationale:
a) GA4 is built entirely on an event-based data model, meaning everything (pageviews, clicks,
purchases) is tracked as an event with flexible parameters.
b) The distinguishing feature is the abandonment of UA's "hit types" (pageview, social, timing) in
favour of a unified event architecture that provides better cross-platform (app and web)
consistency.
c) Option A is incorrect as it describes the obsolete Universal Analytics session-based model.
d) Examiner Pearl: Moving to an event-based model allows for highly customisable data collection,
where parameters add context (e.g., `page_location`, `link_url`) to every discrete user action.
[Google Analytics 4 Architecture Guidelines 2025]
Question 2
An enterprise retail brand has a website, an iOS app, and an Android app. The analytics team
wants to unify user journeys across all three platforms into a single reporting view to understand
cross-device purchasing behaviour. How should the GA4 property be structured to achieve this?
A) Create three separate GA4 properties and link them using a Roll-Up Property.
B) Create one GA4 property and set up three separate Data Streams within it.
C) Create one GA4 property and use different Measurement IDs for each page section.
D) Set up Universal Analytics for the website and Firebase Analytics for the apps, then merge
them in Looker Studio.
Answer: B
Rationale:
a) GA4 is designed for unified App + Web tracking. To track multiple platforms for the same
business, you create a single property with multiple Data Streams (one for Web, one for iOS, one
for Android).
b) This setup ensures that cross-device tracking, user deduplication, and predictive metrics are
calculated cohesively across the entire customer journey.
c) Option A is incorrect because creating separate properties fractures the data, defeating the
purpose of GA4's unified architecture. Roll-up properties are a legacy Analytics 360 concept that
, is handled differently in GA4.
d) Examiner Pearl: Always use a single GA4 property with multiple data streams when the apps
and website represent the same product or user journey; this enables unified user modeling. [GA4
Property Structuring Best Practices 2025]
Question 3
A junior web developer is tasked with deploying the GA4 base code directly onto a client's static
HTML website without using Google Tag Manager. They are looking for the unique identifier to
ensure data is sent to the correct property. Which format represents a GA4 Web Data Stream
Measurement ID?
A) UA-123456789-1
B) AW-987654321
C) G-ABC123XYZ9
D) GTM-N789XYZ
Answer: C
Rationale:
a) A GA4 Web Data Stream is uniquely identified by a Measurement ID that strictly follows the
format starting with "G-".
b) This ID is required when configuring the Google tag (`gtag.js`) to route the event stream to the
correct analytics property.
c) Option A is incorrect as "UA-" denotes legacy Universal Analytics. Option B ("AW-") is for
Google Ads, and Option D ("GTM-") is a Google Tag Manager container ID.
d) Examiner Pearl: The Measurement ID (G-) is specific to Web data streams; Firebase apps use a
Firebase App ID instead. [Google Analytics 4 Implementation Guide 2025]
Question 4
A marketing analyst is testing a new custom event (`generate_lead`) on a staging website. They
have fired the event multiple times but do not want to wait 24 hours for the standard reports to
update. Which native GA4 feature provides real-time validation of event firing and parameter
collection?
A) The Realtime Report exclusively.
B) The DebugView, accessed by enabling the `debug_mode` parameter or using Google Tag
Assistant.
