PL-400 practice questions

Q: Is this PL-400 practice test free?

Yes. All 15 PL-400 practice questions on this page are free, with instant scoring and a written explanation for each answer. You do not need an account and there is no time limit.

Q: How much does the real PL-400 exam cost?

The official price is $165. Cyber VK sells the same official PL-400 voucher for $44.99 — a saving of $120.01. The voucher is identical to one bought direct and is emailed within minutes of payment.

Q: Are these questions the same as the real PL-400 exam?

No. These are original practice questions written to match the published exam objectives and difficulty. They are not real exam questions — sharing or reproducing live exam content breaches every certification body's candidate agreement and can void your certification.

Q: How should I use this practice test?

Use it as a readiness check rather than a study tool. Work through the questions without notes, read the explanation for every answer including the ones you got right, and treat any domain where you miss more than a third as the area to revise before booking your exam.

Question 1

An integration process imports supplier records from an ERP system into a Dataverse table. The ERP supplies a unique SupplierCode value, but not the Dataverse GUID. Which Dataverse feature should the developer configure so the import can match existing rows without first querying for the GUID?

Accepted Answer

An alternate key lets the Web API and SDK reference a row by a business value (e.g., /suppliers(suppliercode='S100')) and enables Upsert without a GUID lookup. Duplicate detection rules only warn about matches and cannot be used for record addressing.

Question 2

A Dataverse table contains a Bank Account Number column. Only members of the Finance team may read or update this column, although all sales users must continue to open the record. What is the correct way to implement this?

Accepted Answer

Column (field) level security is enforced server-side by enabling security on the column and granting access through a field security profile. Business rules only hide the control on the form and do not protect the data from API access.

Question 3

A rollup column on the Account table sums the Estimated Revenue of related Opportunity rows. Users report that after creating an opportunity, the account rollup value does not change for a long period. What is the reason for this behavior?

Accepted Answer

Dataverse maintains rollup values through the Mass Calculate Rollup Field and Calculate Rollup Field system jobs on a recurring schedule, so values are eventually consistent; a user can force an immediate refresh from the form's recalculate icon.

Question 4

A developer must build a reusable code component that renders a custom slider on a model-driven app form and can also be reused in canvas apps. Which tool should be used to scaffold the project?

Accepted Answer

Power Apps Component Framework projects are scaffolded with Power Platform CLI (pac pcf init), which generates the manifest and TypeScript files required for the control. The other tools serve registration, workflow assemblies, and data migration scenarios.

Question 5

A JavaScript function is registered on the OnSave event of a model-driven app form. When a required approval field is empty, the save operation must be cancelled and the user notified. Which code should the function execute?

Accepted Answer

The OnSave event exposes a SaveEventArgs object whose preventDefault() method cancels the save. Returning false has no effect in the client API event pipeline, and save() would attempt another write.

Question 6

A canvas app connects to a Dataverse Accounts table containing 80,000 rows. Which formula will produce a delegation warning and risk returning incomplete results?

Accepted Answer

Len() is not a delegable function for the Dataverse connector, so evaluation happens locally on only the first 500–2,000 rows retrieved. StartsWith, equality comparisons, numeric comparisons, and Sort are all delegable to Dataverse.

Question 7

A business rule must set a field to read-only and enforce a default value both when users edit rows on any form and when rows are created through the Web API. Which scope should the developer select?

Accepted Answer

Only the Entity (Table) scope executes business rule logic server-side, so it applies to records created or updated outside the form, such as through the Web API or an import. Form-level scopes run client-side only.

Question 8

In a cloud flow, a 'Create item' action calls an external system. If that action fails, the flow must send a notification to an administrator instead of terminating silently. How should the developer configure the notification action?

Accepted Answer

The Configure run after setting controls which upstream outcomes allow an action to run, so selecting 'has failed' and 'has timed out' triggers the notification only on failure. Retry policies and Terminate actions do not create a branch for error handling.

Question 9

A developer designs a business process flow for an onboarding process that must guide users through data entry across Candidate, Application, Interview, Offer, Employee, Badge, and Workstation tables in one continuous flow. What design constraint must be addressed?

Accepted Answer

Dataverse limits a single business process flow to five tables (and 30 stages), so a seven-table process must be redesigned or divided into multiple processes. Related tables are still required, but the table count is the blocking limit here.

Question 10

A plug-in must validate incoming data and cancel the operation with a user-friendly error before the platform starts the main database transaction. In which pipeline stage should the step be registered?

Accepted Answer

PreValidation executes before the main system transaction begins, so throwing InvalidPluginExecutionException there cancels the operation without the cost of a transaction rollback. PreOperation already runs inside the transaction.

Question 11

A plug-in registered on the Update message of the Account table updates the same account row, which causes the plug-in to fire repeatedly. What is the recommended way to stop the recursion?

Accepted Answer

The execution context's Depth property increases with each nested pipeline call, so returning early when Depth exceeds 1 prevents the plug-in from processing its own update. Asynchronous registration still re-triggers the step.

Question 12

A sandboxed plug-in calls an external pricing API that regularly takes three to four minutes to respond, and executions are failing. What should the developer do to make the solution reliable?

Accepted Answer

Sandboxed plug-ins are subject to a two-minute execution limit whether registered synchronously or asynchronously, so long-running external calls must be offloaded to Azure through a webhook or Service Bus endpoint. Stage changes and client timeout settings do not extend the platform limit.

Question 13

An external web application must query Dataverse account rows using standard OData v4 syntax. Which endpoint should the developer call?

Accepted Answer

The Dataverse Web API is an OData v4 RESTful endpoint exposed at /api/data/v9.x/ using the table's entity set name. The 2011 endpoint is the deprecated SOAP service, and the discovery service only returns environment information.

Question 14

When an account is updated in Dataverse, the event payload must be posted in near real time to a third-party HTTPS REST service that authenticates callers with a custom HTTP header key. Which integration approach should the developer register?

Accepted Answer

Webhooks post the execution context as JSON directly to an external HTTPS endpoint and support authentication with a query-string WebhookKey or an HTTP header. Service Bus and Event Hub endpoints deliver to Azure messaging services, not arbitrary REST APIs.

Question 15

A .NET console application must create an account, a contact, and a related task in Dataverse so that if any single create fails, none of the three rows are persisted. Which SDK request should be used?

Accepted Answer

ExecuteTransactionRequest executes all contained messages in a single database transaction, so a failure rolls back every operation. ExecuteMultipleRequest only stops processing on error and does not undo requests that already succeeded, and batch operations are transactional only inside a changeset.

PL-400 — PL-400 Microsoft Power Platform Developer Associate Exam Voucher Practice Test

Free Practice Test

PL-400 practice test — common questions