PL-900 Demonstrate capabilities of Power BI Practice Question
This PL-900 practice question tests your understanding of demonstrate capabilities of power bi. 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.
A Power BI report uses a calculated column that shows [Sales Amount] * 1.1. Users notice the column shows incorrect values after a data refresh. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The DAX formula was edited to multiply by 1.2 instead of 1.1
Option A is correct because if the DAX formula was edited to multiply by 1.2 instead of 1.1, the calculated column would produce values 9.09% higher than expected after the refresh. This directly explains the discrepancy users observe, as calculated columns are recomputed during data refresh based on the current formula definition.
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.
✓
The DAX formula was edited to multiply by 1.2 instead of 1.1
Why this is correct
Changing the multiplier would produce different results.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The dataset was refreshed in Import mode instead of DirectQuery
Why it's wrong here
Refresh mode does not affect the calculation logic.
✗
The data type of 'Sales Amount' changed from decimal to integer
Why it's wrong here
This would cause a type conversion error, not incorrect values.
✗
The source column name changed from 'Sales Amount' to 'SalesAmt'
Why it's wrong here
This would break the formula, causing an error, not incorrect values.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume a data type change or refresh mode is the cause, but the question specifically describes a consistent scaling error, which points directly to a formula change rather than structural or data source issues.
Detailed technical explanation
How to think about this question
Calculated columns in Power BI are evaluated row-by-row during data refresh using DAX, and their results are stored in memory. If the DAX expression is altered, the column is recomputed entirely on the next refresh, meaning any change to the multiplier directly scales all values. In contrast, measures are evaluated at query time and are not stored, which is why this issue is specific to calculated columns.
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.
Demonstrate capabilities of Power BI — This question tests Demonstrate capabilities of Power BI — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The DAX formula was edited to multiply by 1.2 instead of 1.1 — Option A is correct because if the DAX formula was edited to multiply by 1.2 instead of 1.1, the calculated column would produce values 9.09% higher than expected after the refresh. This directly explains the discrepancy users observe, as calculated columns are recomputed during data refresh based on the current formula definition.
What should I do if I get this PL-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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