Power Platform Developer

Sample PL-400 practice questions

5 of the 300 original questions in our PL-400 bank, written to match the real exam's style and difficulty. Every question includes a full explanation — expand each answer to check your reasoning.

1. Question 1medium

   A requirement needs synchronous validation that blocks a save if related data is invalid, running server-side. Which extension point is most appropriate?

   • AA scheduled cloud flow
   • BA plug-in registered on the PreOperation stage (synchronous)
   • CA Power BI measure
   • DA canvas app formula
   Show answer & explanation

   Correct: B

   A synchronous plug-in on PreOperation can validate and throw to block the save, running server-side for all clients. Cloud flows are async/event-driven.

2. Question 2medium

   You must decide where to put business logic that should run regardless of which client (app, API, or import) modifies the data. Where should it go?

   • AClient-side JavaScript on the form
   • BServer-side (plug-in / Dataverse logic)
   • CA canvas app OnSelect formula
   • DA model-driven view filter
   Show answer & explanation

   Correct: B

   Logic that must run for every client belongs server-side (plug-in/Dataverse logic). Client-side JavaScript only runs in the form UI.

3. Question 3medium

   A solution needs to read data that lives in an external system in real time, without copying it into Dataverse. Which option fits?

   • AStandard table
   • BVirtual table
   • CElastic table
   • DActivity table
   Show answer & explanation

   Correct: B

   Virtual tables surface external data in real time without storing it in Dataverse.

4. Question 4hard

   You need very high-volume, sparse, write-heavy storage (e.g., IoT-style telemetry) inside Dataverse. Which table type is designed for this?

   • AStandard table
   • BVirtual table
   • CElastic table
   • DActivity table
   Show answer & explanation

   Correct: C

   Elastic tables (Cosmos DB–backed) are built for high-volume, sparse, write-heavy workloads like telemetry.

5. Question 5medium

   When assessing security impact on solution components, which policy could block a flow from combining a business connector with a social-media connector?

   • AA data loss prevention (DLP) policy
   • BA rollup column
   • CA site map
   • DA Quick View form
   Show answer & explanation

   Correct: A

   DLP policies classify connectors (Business/Non-Business/Blocked) and can prevent combining connectors across groups.