PL-300 Visualize and analyze the data Practice Question
You have a Power BI report with a map visual showing sales by city. You want to ensure that cities with higher sales are represented by larger bubbles. What should you do?
⚠ Common exam trap
Test-takers frequently confuse the Tooltips field well with the Size field well; tooltips show data on hover, while Size controls bubble size.
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
✓
Place the Sales measure in the Size field well of the map visual.
To size map bubbles by a measure, you place that measure in the Size field well. The map visual then scales the bubbles according to the measure's value. This is the standard way to create proportional symbol maps in Power BI.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a measure that calculates the rank of each city by sales and use it as the Location field.
Why it's wrong here
Using a rank as the Location field would not map to geographical locations correctly. The Location field expects geographical data like city names or coordinates. This would break the map visual and not size bubbles by sales.
- ✗
Place the Sales measure in the Tooltips field well of the map visual.
Why it's wrong here
The Tooltips field well adds the Sales measure to the tooltip that appears when hovering over a bubble. It does not affect the bubble size. While it provides additional information, it does not fulfill the requirement of sizing bubbles by sales.
- ✓
Place the Sales measure in the Size field well of the map visual.
Why this is correct
The Size field well in a map visual controls the size of the bubbles based on a numeric value. Placing the Sales measure there will scale the bubbles proportionally to sales, making higher sales appear as larger bubbles. This directly achieves the requirement.
- ✗
In the map's formatting options, set the Bubble size to 'Sales'.
Why it's wrong here
There is no formatting option to set bubble size to a specific field directly. Bubble size is controlled by the Size field well, not by formatting options. The formatting pane controls appearance like color and transparency, not the data-driven sizing.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Microsoft exam blueprint
This PL-300 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 PL-300 exam.