Microsoft Power Platform Developer

PL-400 Practice Test

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Today's 10 PL-400 questions

Use this PL-400 practice test to review Microsoft Power Platform Developer. Questions rotate daily and each answer links back to the source used to write it.

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Question 1 of 10

Objective Implement advanced canvas logic and reusable components Implement Power Apps improvements

A canvas search formula displays a delegation warning against a large SharePoint list. Small test data looks correct. What risk must the developer address?

Concept tested:

Source:Understand delegation in a canvas app

Question 2 of 10

Objective Process long-running, scheduled, and event-driven work with Azure Functions Extend the platform

A reconciliation process fans out work across regions, waits for all activities, and must resume from durable checkpoints if the host restarts. The run may last twenty minutes and should report final success or failure. Which Azure Functions design fits?

Concept tested:

Question 3 of 10

Objective Design reusable components, connectors, code components, and integrations Create a technical design

Four canvas apps need the same standard-control header. A separate integration must process invoices after save without delaying users. Which design is best?

Concept tested:

Question 4 of 10

Objective Implement model-driven client scripting, commands, Web API calls, and navigation Extend the user experience

A client script must show an immediate warning and asynchronously retrieve entitlement data. The entitlement rule must also block API-created records, and users may lack Read privilege on the related table. Which design is best?

Concept tested:

Question 5 of 10

Objective Implement solutions, dependencies, environment variables, layers, pipelines, and CI/CD Build Power Platform solutions

A managed solution hotfix must replace an installed component and remove a deprecated component across test and production. The team wants one governed release rather than leaving an accumulating patch layer. What should it deliver?

Concept tested:

Question 6 of 10

Objective Synchronize Dataverse data with change tracking, alternate keys, and upsert Develop integrations

An integration currently rereads every Dataverse row nightly. It needs only rows changed or deleted since the last successful synchronization. Which capability should it use?

Concept tested:

Question 7 of 10

Objective Optimize and troubleshoot canvas and model-driven apps Implement Power Apps improvements

A model-driven app sends an unexpected update only for some users. The developer needs runtime operations, network calls, and errors from a live session. What should be started?

Concept tested:

Question 8 of 10

Objective Design technical architecture, security, and business logic placement Create a technical design

A field must become required immediately on a model-driven form under a condition, but the same rule must block invalid imports and Web API writes. Which principle applies?

Concept tested:

Question 9 of 10

Objective Build, package, deploy, and consume PCF code components Extend the user experience

A model-driven host changes the value of a bound PCF input after a server refresh. The control must render the host-supplied value, but it should not notify the host that it changed the value itself. Where should the control read the new value?

Concept tested:

Question 10 of 10

Objective Configure environments, troubleshoot security, and apply least privilege Build Power Platform solutions

A deployment automation process uses a developer's System Administrator account across development, test, and production. It requires only solution import operations in test and production. What is the better design?

Concept tested:

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The free daily PL-400 set includes crawlable question text, answer choices, correct answer labels, objective mapping, and source links. Only the first SEO card includes answer explanations and any extra learning features. Pro-only bank questions stay locked; this section mirrors only the 10 free daily questions already shown on this page.

Question 1 A canvas search formula displays a delegation warning against a large SharePoint list. Small test data looks correct. What risk must the developer address?

Answer choices

A. The app will always query every remote row despite the warning
B. The nondelegable portion may evaluate only a local row limit and omit valid matches
C. The warning affects colors only
D. Delegation automatically creates a Dataverse plug-in

Correct answer

The nondelegable portion may evaluate only a local row limit and omit valid matches

A delegation warning means part of the query cannot be executed by the source. Large datasets can therefore return incomplete locally evaluated results.

Wrong-answer review

A. The app will always query every remote row despite the warning: Nondelegable operations cannot be assumed to scan the complete source.
C. The warning affects colors only: Delegation controls data processing location rather than appearance.
D. Delegation automatically creates a Dataverse plug-in: Canvas delegation has no relationship to plug-in registration.

Extra learning features

Why candidates miss this

The 'Delegation automatically creates a Dataverse plug-in' distractor is tempting because it simplifies the issue, but it’s incorrect. The warning indicates incomplete results due to delegation limitations, not a plug-in creation. The decisive clue is the concept of nondelegable operations. Likely wrong answer: Delegation automatically creates a Dataverse plug-in Review focus: Understand delegation in a canvas app

Objective/domain: Implement Power Apps improvements

Source: Understand delegation in a canvas app

Question 2 A reconciliation process fans out work across regions, waits for all activities, and must resume from durable checkpoints if the host restarts. The run may last twenty minutes and should report final success or failure. Which Azure Functions design fits?

Answer choices

A. Use a Durable Functions orchestrator with activity functions and durable checkpoints
B. Use a single synchronous Dataverse plug-in with a longer timeout
C. Use a model-driven OnLoad event to retain the workflow state
D. Use only a timer trigger and keep the entire run in process memory

Correct answer

Use a Durable Functions orchestrator with activity functions and durable checkpoints

Objective/domain: Extend the platform

Source: Durable Functions overview

Question 3 Four canvas apps need the same standard-control header. A separate integration must process invoices after save without delaying users. Which design is best?

Answer choices

A. Put asynchronous invoice processing inside the header component
B. Use a synchronous plug-in for both UI reuse and invoice processing
C. Copy the header into every app and call the invoice system from form JavaScript
D. Create a component-library header and decouple invoice processing through asynchronous or event-driven integration

Correct answer

Create a component-library header and decouple invoice processing through asynchronous or event-driven integration

Objective/domain: Create a technical design

Source: Power Apps component framework overview

Question 4 A client script must show an immediate warning and asynchronously retrieve entitlement data. The entitlement rule must also block API-created records, and users may lack Read privilege on the related table. Which design is best?

Answer choices

A. Use a synchronous browser request and trust the client as authoritative
B. Hide all errors and assume missing data means entitled
C. Use an asynchronous client Web API call with success and privilege-error handling for feedback, plus server-side enforcement for every write path
D. Put the rule only in command-bar JavaScript

Correct answer

Use an asynchronous client Web API call with success and privilege-error handling for feedback, plus server-side enforcement for every write path

Objective/domain: Extend the user experience

Source: Client API object model for model-driven apps

Question 5 A managed solution hotfix must replace an installed component and remove a deprecated component across test and production. The team wants one governed release rather than leaving an accumulating patch layer. What should it deliver?

Answer choices

A. An unmanaged export and manual production edits
B. A new managed solution version delivered as an upgrade of the installed solution
C. An unrelated managed solution with a different publisher
D. A solution backup copied into each environment

Correct answer

A new managed solution version delivered as an upgrade of the installed solution

Objective/domain: Build Power Platform solutions

Source: Upgrade or update a solution

Question 6 An integration currently rereads every Dataverse row nightly. It needs only rows changed or deleted since the last successful synchronization. Which capability should it use?

Answer choices

A. Dataverse change tracking with a persisted version token
B. A full solution export
C. A PCF updateView call
D. A model-driven form OnLoad handler

Correct answer

Dataverse change tracking with a persisted version token

Objective/domain: Develop integrations

Source: Use Upsert to create or update a record

Question 7 A model-driven app sends an unexpected update only for some users. The developer needs runtime operations, network calls, and errors from a live session. What should be started?

Answer choices

A. A solution import
B. A license assignment
C. A component library
D. Power Apps Monitor

Correct answer

Power Apps Monitor

Objective/domain: Implement Power Apps improvements

Source: Debug apps with Monitor

Question 8 A field must become required immediately on a model-driven form under a condition, but the same rule must block invalid imports and Web API writes. Which principle applies?

Answer choices

A. Client logic is sufficient because all writes render the form
B. Use only a report alert
C. Hide the field with DOM manipulation
D. Use client logic for responsive form behavior and server-side logic for universal enforcement

Correct answer

Use client logic for responsive form behavior and server-side logic for universal enforcement

Objective/domain: Create a technical design

Source: Security roles and privileges for Dataverse

Question 9 A model-driven host changes the value of a bound PCF input after a server refresh. The control must render the host-supplied value, but it should not notify the host that it changed the value itself. Where should the control read the new value?

Answer choices

A. Call init again for every host refresh
B. Write the new value into the component manifest
C. Read the bound parameter in updateView and render from the current context
D. Call notifyOutputChanged even though the control did not change the value

Correct answer

Read the bound parameter in updateView and render from the current context

Objective/domain: Extend the user experience

Source: Power Apps component framework overview

Question 10 A deployment automation process uses a developer's System Administrator account across development, test, and production. It requires only solution import operations in test and production. What is the better design?

Answer choices

A. Use the same human identity but rotate its password monthly
B. Merge all environments so the account has only one place to sign in
C. Give all developers production administrator rights for backup
D. Use a service principal application user with least-required roles per isolated environment and keep lifecycle stages separated

Correct answer

Use a service principal application user with least-required roles per isolated environment and keep lifecycle stages separated

Objective/domain: Build Power Platform solutions

Source: Security roles and privileges for Dataverse

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