SALESFORCE-PD1 Practice Test 5 — 10 Questions

Question 1

Which THREE requirements must be met when implementing a custom Lightning Web Component pagination control? Choose 3 answers.

Accepted Answer

Slice the master dataset array based on current offset and limit calculations.. Option A is correct because a custom LWC pagination control must compute the visible subset of records by slicing the master dataset array using the current offset (page number × page size) and the page size limit, since LWC has no built-in pagination primitive. Option C is correct because the Next and Previous buttons must be disabled when boundary conditions are reached — Previous at page 1 and Next at the last page — to prevent out-of-range navigation and provide correct UX. Option D is correct because the component must track the current page number and page size as reactive properties (e.g., @track or standard reactive fields) so that changes trigger re-rendering and recomputation of the sliced data. Option B is incorrect because Visualforce's standardSetController is a Visualforce/Apex construct and cannot be used inside LWC JavaScript; pagination in LWC is handled client-side or via Apex methods. Option E is incorrect because mutating the server database on every page click is unnecessary and harmful — pagination should only change the client-side view, not persist data on each navigation.

Answer

Use standard Visualforce standardSetController inside the LWC JavaScript.

Answer

Directly mutate the server database on every page click.

Question 2

A developer is implementing a Batch Apex class to process 500,000 Contact records. Which method defines the starting point and retrieves the records to be processed?

Accepted Answer

Database.QueryLocator start(Database.BatchableContext BC). The start method of a Database.Batchable class returns either a Database.QueryLocator or an Iterable that defines the records to be processed.

Answer

void execute(Database.BatchableContext BC, List<SObject> scope)

Answer

void finish(Database.BatchableContext BC)

Answer

Database.BatchableContext start(Database.BatchableContext BC)

Question 3

A developer needs to chain asynchronous jobs. Which interface allows for a single job to be queued from within the execution of another?

Accepted Answer

Queueable. Queueable Apex allows for chaining jobs by calling System.enqueueJob within the execute method.

Answer

Batchable

Answer

Schedulable

Answer

Future

Question 4

An enterprise application requires real-time integration where outgoing callouts must be triggered from an Apex trigger. What architectural pattern must the developer use?

Accepted Answer

Future method annotated with @future(callout=true) invoked from an after trigger.. Triggers cannot make direct synchronous callouts, so they must invoke an asynchronous mechanism like a future method with callout=true.

Answer

Batch Apex execute method without queueing.

Answer

Direct synchronous HTTP callout inside the before insert trigger.

Answer

Validation rule containing an endpoint URL.

Question 5

A developer is creating a reusable LWC utility and needs to invoke an Apex method imperatively. The method accepts a record ID parameter. What is the correct way to pass this parameter in JavaScript?

Accepted Answer

Pass the parameter as an object with property names matching the Apex method parameters: getAccount({ accountId: recordId }). When invoking an Apex method imperatively from LWC, parameters must be passed as a single object where the keys match the Apex method parameter names exactly. For an Apex method like getAccount(Id accountId), the JavaScript call should be getAccount({ accountId: recordId }). This ensures the correct mapping of values to parameters.

Answer

Pass the parameter as a positional string argument: getAccount({recordId})

Answer

Bind the parameter using the @api decorator inside the JavaScript function body.

Answer

Assign the parameter to the window.apexParams object prior to invocation.

Question 6

Which trigger context variable should a developer use to access the map of old record versions prior to the update operation?

Accepted Answer

Trigger.oldMap. Trigger.oldMap provides a map of IDs to the old versions of the SObject records for update and delete triggers.

Answer

Trigger.old

Answer

Trigger.newMap

Answer

Trigger.new

Question 7

A developer implements a Queueable class that makes callouts and needs to test it using Test.startTest() and Test.stopTest(). When does the asynchronous queueable job execute during a unit test?

Accepted Answer

When Test.stopTest() is executed.. Asynchronous code executed inside Test.startTest() and Test.stopTest() runs synchronously when Test.stopTest() is called.

Answer

At the end of the test method automatically without stopTest.

Answer

Immediately when enqueued.

Answer

Only when explicitly mocked via HttpCalloutMock.

Question 8

Which TWO features of @isTest(SeeAllData=true) should a developer be aware of?

Accepted Answer

It makes tests results dependent on the org's existing data.. It grants access to all org data and can lead to unexpected test results.

Answer

It speeds up test execution.

Answer

It is required for testing standard objects.

Answer

It ignores all governor limits.

Question 9

A developer wants to inspect the code coverage of individual classes directly within the Salesforce Developer Console. Under which tab can the developer view this breakdown?

Accepted Answer

Tests tab. The Tests tab in the Developer Console displays test execution status, test results, and code coverage percentages by class.

Answer

Query Editor tab

Answer

DOM Inspector tab

Answer

Logs tab

Question 10

A developer creates a parent Lightning Web Component containing a child component. The parent needs to call a public method defined inside the child component. How is this accomplished?

Accepted Answer

Use this.template.querySelector('c-child-component').publicMethodName() in the parent component.. In LWC, a parent can call a public method on a child component by querying the child element from the parent's template and invoking the method directly. The child must expose the method with the @api decorator, and the parent uses this.template.querySelector('c-child-component') to obtain the element reference, then calls the method on it. This is the documented pattern for parent-to-child method invocation.

Answer

Use the publish() method of the Lightning Message Service.

Answer

Update a shared reactive property passed down via @api.

Answer

Dispatch an event from the parent and listen to it in the child component.