SALESFORCE-PD1 Practice Test 22 — 15 Questions

Question 1

An Apex trigger needs to prevent records from being saved if a specific validation condition fails. How should the developer reject the DML operation on a specific record?

Accepted Answer

record.addError('Validation failed.');. Adding an error message to a record sObject in Trigger.new (e.g., record.addError('Message')) prevents that record from saving and adds an error to the UI/transaction.

Answer

Trigger.rollback();

Answer

ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, 'Error'));

Answer

throw new ValidationException('Error');

Question 2

A developer is utilizing the Lightning Message Service (LMS) to facilitate communication between an Aura component and a Lightning Web Component. Which THREE steps are required to implement LMS successfully? (Choose THREE)

Accepted Answer

Define a Message Channel in XML format under the /messageChannels/ directory.. Option A is correct because LMS requires a message channel to be defined as metadata in XML format inside the /messageChannels/ directory of a Salesforce DX project, which creates the ChannelName__c LightningMessageChannel used by all subscribers and publishers. Option B is correct because the LWC must import the channel reference with the exact scoped module syntax '@salesforce/messageChannel/ChannelName__c' so that publish() and subscribe() can target that specific channel. Option D is correct because the actual messaging is performed by calling publish() and subscribe() (and optionally unsubscribe()) from the 'lightning/messageService' module, which is how the Aura component and LWC exchange messages over the channel. Option C is not needed because LMS is a client-side, browser-based messaging service and does not involve Apex triggers or server-side listeners. Option E is not required because lightning__MessageChannel is not a valid component target for consuming LMS; the channel is referenced via the import, not via the component metadata targets.

Answer

Create an Apex trigger to listen to the Message Channel on the server side.

Answer

Configure the component metadata file with lightning__MessageChannel.

Question 3

A developer is building an Aura component and needs to include a Lightning Web Component inside it. How does the Aura markup reference the LWC?

Accepted Answer

. In Aura markup, a Lightning Web Component is referenced using the c: namespace followed by the component's camelCase name, e.g., . This is the documented syntax for embedding an LWC inside an Aura component. The c: namespace maps to the default namespace for custom components in the org.

Answer

<apex:includeComponent name="myLwcComponent" />

Answer

<lightning:lwc name="myLwcComponent" />

Answer

<aura:component include="myLwcComponent" />

Question 4

Which TWO conditions must be met for an Apex method to be wired using the @wire service in an LWC? Choose 2 answers.

Accepted Answer

The Apex method must be public or global and static.. Option B is correct because an Apex method exposed to Lightning Web Components via @wire must be declared public or global and static, since the wire adapter invokes it without an instance context. Option D is correct because the method must be annotated with @AuraEnabled(cacheable=true); the cacheable=true setting is what allows the wire service to call the method and cache its results on the client. Options A, C, and E are incorrect because a wired Apex method does not need to return a DML result, does not need to return a PageReference, and must not be asynchronous via @future — @future methods cannot be wired and cannot be marked cacheable.

Answer

The Apex method must return a DML operation result.

Answer

The Apex method must return a PageReference.

Answer

The Apex method must be asynchronous using @future.

Question 5

Which governor limit is associated with the total number of SOQL queries issued in a single synchronous transaction?

Accepted Answer

100. The limit for synchronous SOQL queries is 100.

Answer

10

Answer

50

Answer

200

Question 6

A developer is implementing communication in Lightning Web Components. Which TWO mechanisms are valid for passing data or messages between components? (Choose TWO)

Accepted Answer

Dispatching and listening to CustomEvent instances in parent-child hierarchies.. Option B is correct because in Lightning Web Components, a child component can dispatch a CustomEvent (via this.dispatchEvent(new CustomEvent(...))) that bubbles up the DOM, and a parent component can listen for it using an event handler in its template or with addEventListener, making it the standard mechanism for child-to-parent communication. Option E is correct because Lightning Message Service (LMS) provides a publish-subscribe API (lightning/messageService with publish() and subscribe()) that lets components communicate across the DOM—including between unrelated components, across different component trees, and even with Aura components—by publishing to a message channel. Option A is not valid because a component cannot directly reach into a sibling component's properties; siblings have no direct reference to each other and must communicate through a common parent or a message service. Option C is not valid because $A.get('e.force:event') is an Aura framework API for application events, and LWC does not support Aura application events; LWC uses CustomEvent or LMS instead. Option D is not valid because LWC components run in a secure, encapsulated environment (Lightning Web Security/synthetic shadow DOM) and sharing state through global window variables is an anti-pattern that breaks encapsulation and is not a supported communication mechanism.

Answer

Directly assigning properties on child components from sibling components.

Answer

Using application events via $A.get('e.force:event') in LWC.

Answer

Modifying global window variables shared across component scopes.

Question 7

A developer is choosing between Future methods and Queueable Apex. Which TWO characteristics are unique to Queueable Apex? (Choose TWO.)

Accepted Answer

Queueable Apex returns an AsyncApexJob ID that can be used to monitor job progress.. Queueable Apex supports complex objects and job chaining, unlike future methods.

Answer

Queueable Apex methods can be called synchronously from inside formula fields.

Answer

Queueable Apex does not support asynchronous job chaining.

Answer

Queueable Apex restricts external HTTP callouts entirely.

Question 8

What is the primary benefit of using Flow Builder over Apex triggers when implementing simple field validations?

Accepted Answer

Flows can be managed and updated declaratively without code deployment.. Flow Builder allows administrators and developers to build validations declaratively without writing and maintaining code.

Answer

Flows bypass all system validation rules automatically.

Answer

Flows do not count against governor limits.

Answer

Flows execute faster than compiled Apex triggers.

Question 9

Which TWO tools or APIs can a developer use to deploy metadata between Salesforce organizations? (Choose two.)

Accepted Answer

Outbound and Inbound Change Sets. Change Sets and the Metadata API (via CLI or IDEs) are primary tools for metadata deployment.

Answer

Data Loader

Answer

Apex Anonymous Windows

Answer

Process Builder

Question 10

Which context variable in an Apex trigger contains the old map of records for update operations?

Accepted Answer

Trigger.oldMap. Trigger.oldMap provides a map of ID to the old version of records during update and delete triggers.

Answer

Trigger.old

Answer

Trigger.new

Answer

Trigger.newMap

Question 11

What is the correct syntax to reference a custom label in a Lightning Web Component JavaScript file?

Accepted Answer

import labelName from '@salesforce/label/LabelName';. In Lightning Web Components (LWC), custom labels are imported using the standard ES6 import syntax from the special '@salesforce/label' module. The correct syntax is `import labelName from '@salesforce/label/LabelName';`, where `LabelName` is the API name of the custom label. This import makes the label's value available as a JavaScript variable that can be used in the component's template or logic. This approach is specific to LWC and differs from Aura or Visualforce.

Answer

Label.get('LabelName')

Answer

System.Label.LabelName

Answer

$Label.LabelName

Question 12

Which THREE best practices should a developer follow when implementing CRUD and FLS checks in Apex? Choose 3 answers.

Accepted Answer

Check sObject createability before performing insert DML operations.. Developers should check isAccessible, isCreateable, and isUpdateable using describe results before querying or saving data.

Answer

Rely solely on 'with sharing' keywords to handle field-level security checks.

Answer

Disable all triggers when performing security checks.

Question 13

A developer is writing code that processes untrusted data and wants to automatically strip fields and relationships that the current user cannot access, without throwing an exception. Which feature should be used?

Accepted Answer

Security.stripInaccessible(). The Security.stripInaccessible() method strips fields and SObjects that the user lacks permission to read or create/update, avoiding runtime security exceptions.

Answer

Database.insert(records, AccessType.ENFORCE_ACCESSIBLE)

Answer

Approval.lock()

Answer

Schema.sObjectType.fields.isAccessible()

Question 14

A developer writes a Queueable Apex job that queries 50,000 records, performs calculations, and updates them. During testing, the job hits a heap size limit. What is the standard asynchronous heap size limit in Apex?

Accepted Answer

12 MB. The asynchronous transaction heap size limit is 12 MB, compared to 6 MB for synchronous transactions.

Answer

50 MB

Answer

36 MB

Answer

6 MB

Question 15

Which Apex data type should a developer use to represent a precise geographic location with latitude and longitude coordinates?

Accepted Answer

Location. The Location primitive data type in Apex is designed specifically to represent geographic locations with latitude and longitude.

Answer

Coordinate

Answer

Address

Answer

GeoPoint