SALESFORCE-PD1 Practice Test 34 — 15 Questions

Question 1

A developer is building a Lightning Web Component and needs to perform validation on an input field before submission. Which method on a lighting-input element checks validity?

Accepted Answer

checkValidity(). checkValidity() evaluates validity and reports validity status on input components.

Answer

verify()

Answer

isValid()

Answer

validate()

Question 2

A developer is building a Lightning Web Component and needs to navigate to a URL that is external to Salesforce. Which PageReference type should be used with NavigationMixin?

Accepted Answer

standard__webPage. standard__webPage is the PageReference type for navigating to external URLs or web pages.

Answer

standard__recordPage

Answer

standard__namedPage

Answer

standard__objectPage

Question 3

Which TWO tools or features are recommended for styling Lightning Web Components according to best practices? Choose 2 answers.

Accepted Answer

Component-scoped CSS style files (.css). SLDS utility classes and scoped CSS stylesheets are the standard ways to style LWC.

Answer

Global un-scoped CSS stylesheets loaded in every page

Answer

Inline style tags in HTML templates

Answer

Bootstrap CSS framework via static resource

Question 4

A developer is creating a Lightning Web Component that needs to display a list of Accounts. The developer wants to fetch the data imperatively when a user clicks a button rather than automatically via a wire adapter. What is the correct approach?

Accepted Answer

Call the imported Apex method as a JavaScript function inside the button's event handler and handle the returned promise.. Imperative Apex calls are invoked as standard JavaScript promises, typically triggered by an event handler such as a button click.

Answer

Use the @api track decorator on the Apex method call inside the template.

Answer

Use the @wire decorator on an imported Apex method and update a reactive property.

Answer

Configure the component metadata file to fetch the data imperatively on load.

Question 5

A developer is writing a Visualforce page with custom controller logic and needs to ensure that database operations are executed transactionally. What happens by default when an unhandled exception occurs during a controller action method?

Accepted Answer

The entire transaction is rolled back.. All database changes in the transaction are rolled back automatically by the platform if an unhandled exception occurs.

Answer

The user is redirected to the login page.

Answer

Only partial records are saved; successful ones are committed.

Answer

Changes are committed and an email is sent to the admin.

Question 6

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.. Wired Apex methods must be static, public or global, and annotated with @AuraEnabled(cacheable=true).

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 7

A developer is writing a Visualforce page and wants to include standard Salesforce styling and icons. What tag should be added to the top of the Visualforce page?

Accepted Answer

. includes the Salesforce Lightning Design System styles and assets in a Visualforce page.

Answer

<apex:lightningStyleguide />

Answer

<apex:stylesheet value="{!$Resource.SLDS}" />

Answer

<apex:includeLightning />

Question 8

A developer is writing a Visualforce page and wants to display messages generated by controllers or validation rules. Which component should be used?

Accepted Answer

. displays all messages queued on the page for the current request.

Answer

<apex:errorMessages />

Answer

<apex:outputPanel type="messages" />

Answer

<apex:messageLog />

Question 9

A developer is troubleshooting an issue where a Lightning Web Component is not picking up changes to the internal fields of an object property. What is the cause of this behavior in LWC reactivity?

Accepted Answer

LWC reactivity is shallow, so nested object property mutations require creating a new object reference or using @track.. LWC reactivity is shallow; mutating properties of a nested object without reassigning the reference requires @track or creating a new object reference.

Answer

Reactive properties must be declared as constants using const instead of let.

Answer

The component must be wrapped in an Aura container to enable deep object tracking.

Answer

LWC does not support objects as reactive properties under any circumstances.

Question 10

A developer is creating a Lightning Web Component that needs to interact with Salesforce data using Lightning Data Service. Which TWO wire adapters are natively available in the @salesforce/apex or lightning/ui* modules for basic record operations? (Choose TWO)

Accepted Answer

getRecordUi from 'lightning/uiRecordApi'. getRecord and getRecordUi are standard wire adapters provided by lightning/uiRecordApi for working with Salesforce records.

Answer

getAccountList from 'lightning/accountApi'

Answer

fetchRecord from 'lightning/recordStore'

Answer

queryDatabase from 'lightning/database'

Question 11

Which TWO tools or environments are officially supported for developing Lightning Web Components? (Choose TWO)

Accepted Answer

Visual Studio Code with the Salesforce Extension Pack. Visual Studio Code with the Salesforce Extension Pack and Salesforce CLI are standard tools for LWC development.

Answer

Microsoft FrontPage 2003

Answer

Eclipse IDE with the Force.com IDE v1 plugin

Answer

Dreamweaver MX with custom snippet extensions

Question 12

A developer has a Lightning Web Component with a reactive property 'recordId'. How should the property be decorated to ensure it receives the current record ID when placed on a record page?

Accepted Answer

@api recordId;. @api makes properties public so the container can pass values like recordId into the component.

Answer

@wire recordId;

Answer

@track recordId;

Answer

@wire(getRecord) recordId;

Question 13

A developer is writing a Lightning Web Component and needs to load a third-party JavaScript library (such as D3.js) stored as a static resource. Which lifecycle hook is most appropriate for initiating the load using loadScript?

Accepted Answer

connectedCallback(). Third-party scripts should be loaded in connectedCallback() because the component must be inserted in the DOM before script tags can be appended.

Answer

constructor()

Answer

disconnectedCallback()

Answer

renderedCallback()

Question 14

A developer wants to prevent sensitive fields from being included in the Visualforce view state to reduce size. Which keyword should be added to the field declaration in the controller?

Accepted Answer

transient. transient keyword prevents variables from being saved in the view state.

Answer

private

Answer

static

Answer

final

Question 15

A developer is reviewing a Lightning Web Component that makes calls to an Apex controller. Which THREE best practices should be followed when designing the Apex methods for LWC consumption? (Choose THREE)

Accepted Answer

Use primitive data types or simple serializable wrapper classes for parameters and return values.. Apex methods for LWC should be cacheable when read-only, handle security/sharing properly, and accept appropriate parameter types.

Answer

Mark all Apex controller methods as global to allow unrestricted LWC access.

Answer

Pass entire sobject records with complex parent relationships directly from client-side JavaScript without validation.