SALESFORCE-PD1 Practice Test 31 — 15 Questions

Question 1

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)

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Define a Message Channel in XML format under the /messageChannels/ directory.. LMS requires defining a Message Channel metadata file, importing the channel in the component, and calling publish or subscribe APIs.

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 2

A developer creates a Visualforce page and wants to include standard Salesforce styling. Which attribute on the <apex:page> tag enables this?

Accepted Answer

standardStylesheets="true". The standardStylesheets attribute controls whether standard Salesforce styling is applied.

Answer

lightningStylesheets="true"

Answer

applyHtmlTag="true"

Answer

sidebar="true"

Question 3

Which tag is used in Visualforce to iterate over a collection of records and display them in a table?

Accepted Answer

apex:pageBlockTable. or are used for tabular iteration.

Answer

<apex:repeat>

Answer

apex:iterator

Answer

apex:outputPanel

Question 4

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';. Custom labels are imported from @salesforce/label/Namespace.LabelName.

Answer

Label.get('LabelName')

Answer

System.Label.LabelName

Answer

$Label.LabelName

Question 5

Which tag is used in Visualforce to output field labels and values dynamically based on sObject field definitions?

Accepted Answer

. renders field values with correct formatting and related labels.

Answer

<apex:field>

Answer

<apex:inputField>

Answer

<apex:outputText>

Question 6

A developer is building a Lightning Web Component and needs to dispatch a custom event. Which constructor should be used to create the event?

Accepted Answer

CustomEvent. CustomEvent is the standard browser constructor used to create custom events in LWC.

Answer

Event

Answer

AuraEvent

Answer

LightningEvent

Question 7

Which THREE strategies are recommended for improving the performance of Lightning Web Components rendering large lists of data? Choose 3 answers.

Accepted Answer

Provide a unique, stable 'key' attribute (such as record Id) on each iterated element in for:each loops.. Performance for large lists can be optimized by using pagination or infinite scrolling, ensuring unique stable keys in for:each loops, and avoiding complex nested getters.

Answer

Use synchronous imperative Apex calls inside template iterators.

Answer

Render all 10,000 records at once in a single flat DOM tree without pagination.

Question 8

A developer is troubleshooting a Lightning Web Component where data returned from an Apex wire adapter needs to be mutated before being rendered. What is the correct pattern to handle this?

Accepted Answer

Create a shallow copy or clone of the wire data object in a getter or property assignment before mutation.. Data returned by wire adapters is immutable (frozen). To mutate it, the developer must create a shallow copy of the data object.

Answer

Decorate the wire property with @api mutable to allow direct writes.

Answer

Use the eval() function to strip immutability constraints from the prototype chain.

Answer

Directly assign new properties to the object returned by the wire adapter property.

Question 9

Why does a test fail if it tries to perform a callout without Test.setMock()?

Accepted Answer

The platform disallows live callouts in test context.. Salesforce blocks all real callouts in tests to prevent side effects.

Answer

Governor limits are exceeded.

Answer

The mock server is not found.

Answer

The callout method is not public.

Question 10

Which tool is best suited for running all tests in an org and viewing the code coverage percentages?

Accepted Answer

Developer Console. The Developer Console provides a built-in interface to run tests and view code coverage immediately.

Answer

Salesforce Setup Menu

Answer

Change Sets

Answer

Workbench

Question 11

Which TWO of the following are limitations when deploying using the Metadata API?

Accepted Answer

Components must be defined in a package.xml manifest. Metadata API deployments require a manifest file and are subject to the same validation rules as the org.

Answer

It allows bypassing governor limits during deployment

Answer

It can only be used for Apex Classes

Answer

It requires a manual review by Salesforce Support

Question 12

A developer is creating a Visualforce page that overrides the standard Account View action. Which attribute must be included in the <apex:page> tag to ensure standard controller functionality?

Accepted Answer

standardController="Account". The standardController attribute binds a Visualforce page to a standard Salesforce object.

Answer

controller="Account"

Answer

object="Account"

Answer

recordId="Account"

Question 13

A developer is writing an Aura component and needs to handle an event fired by a child component. Which attribute is required in the aura:handler tag on the parent component?

Accepted Answer

event. The event attribute on aura:handler specifies the event name to handle.

Answer

name

Answer

method

Answer

controller

Question 14

What is the maximum number of view state bytes allowed in a Visualforce page before Salesforce throws an error?

Accepted Answer

172 KB. The maximum view state limit for a Visualforce page is 172 KB.

Answer

1 MB

Answer

64 KB

Answer

512 KB

Question 15

Which THREE factors influence deployment success?

Accepted Answer

Profile/Permission Set permissions.. Tests, dependencies, and profile permissions are critical.

Answer

The number of users.

Answer

The color of the UI.