[Sep-2026 Newly Released] Plat-Dev-301 Exam Questions For You To Pass [Q66-Q90]

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[Sep-2026 Newly Released] Plat-Dev-301 Exam Questions For You To Pass

Salesforce Plat-Dev-301 Exam: Basic Questions With Answers

Salesforce Plat-Dev-301 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Logic, Process Automation, and Integration	27%	– Complex business logic and automation design – Asynchronous Apex: future, queueable, batch, scheduled – Advanced Apex programming and transaction management – REST/SOAP API, Platform Events, and external integrations
Topic 2: Advanced Developer Fundamentals	15%	– Apply security best practices in development – Work with localization, multi-currency, and global features – Design and maintain scalable, reusable code
Topic 3: Testing, Debugging, and Deployment	20%	– Advanced testing strategies and test frameworks – Debugging and error handling across layers – Deployment strategies, CI/CD, and change management
Topic 4: Performance and Data Management	18%	– Governor limits optimization and best practices – Data modeling and complex data operations – Optimize queries and handle large data volumes
Topic 5: User Interface Development	20%	– Implement advanced Visualforce functionality – Build complex Lightning Web Components and Aura Components – Optimize UI performance and usability

NO.66 A company has a custom object, Order__c, that has a custom picklist field, Status__c, with values of `”New’, `”In Progress’, or `”Fulfilled’ and a lookup field, Contact__c, to Contact.
Which SOQL query will return a unique list of all the Contact records that have no `”Fulfilled’ Orders?

SELECT Id FROM Contact WHERE Id NOT IN (SELECT Id FROM Order__c WHERE Status__c = ‘Fulfilled’)

SELECT Contact__c FROM Order__c WHERE Status__c <> ‘Fulfilled’

SELECT Id FROM Contact WHERE Id NOT IN (SELECT Contact__c FROM Order__c WHERE Status__c = ‘Fulfilled’)

SELECT Contact__c FROM Order__c WHERE Id NOT IN (SELECT Id FROM Order__c Where Status__c = ‘Fulfilled’)

NO.67 Which statement is considered a best practice for writing bulk safe Apex triggers?

Add records to collections and perform DML operations against these collections.

Add LIMIT 50000 to every SOQL statement.

Perform all DML operations from within a future method.

Use the Database methods with allorNone set to £21s= instead of DML statements.

NO.68 A business currently has a process to manually upload orders from its external Order Management System (OMS) into Salesforce.
This is a labor intensive process since accounts must be exported out of Salesforce to get the IDs. The upload file must be updated with the correct account IDs to relate the orders to the corresponding accounts.
Which two recommendations should make this process more efficient?
Choose 2 answers

Identify unique fields on Order and Account and set them as External IDs.

Use the insert wizard in the Data Loader to import the data.

Ensure the data in the file is sorted by the order ID.

Use the upsert wizard in the Data Loader to import the data.

NO.69 Refer to the exhibit

Users of this Visualforce page complain that the page does a full refresh every time the Search button Is pressed. What should the developer do to ensure that a partial refresh Is made so that only the section identified with opportunity List is re-drawn on the screen?

Enclose the DATA table within the <apex:actionRegion> tag.

Implement the render attribute on the <apex:ccxmandButton> tag.

Ensure the action method search returns null.

Implement the <apex:actionfunction> tag with immediate = true.

NO.70 An Aura component has a section that displays some information about an Account and it works well on the desktop, but users have to scroll horizontally to see the description field output on their mobile devices and tablets.

How should a developer change the component to be responsive for mobile and tablet devices? A)

B)

C)

D)

Option A

Option B

Option C

Option D

NO.71 A developer is writing a Jest test for a Lightning web component that conditionally displays child components based on a user’s checkbox selections.
What should the developer do to properly test that the correct components display and hide for each scenario?

Create a new describe block for each test.

Reset the DOM after each test with the after Each() method.

Add a teardown block to reset the DOM after each test.

Create a new jsdom instance for each test.

NO.72 Universal Containers is using a custom Salesforce application to manage customer support cases. The support team needs to collaborate with external partners to resolve certain cases. However, they want to control the visibility and access to the cases shared with the external partners. Which Salesforce feature can help achieve this requirement?

Role hierarchy

Criteria-based sharing rules

Apex managed sharing

Sharing sets

NO.73 Universal Containers ne=ds to integrate with several external systems. The process Is Initiated when a record Is created in Salesforce, The remote systems do not require Salesforce to wait for a response before continuing.
What is the recommended best solution to accomplish this?

PushTopic event

Qutbound message

Trigger with HTTP callout

Platform event

NO.74 Consider the Apex controller below, that is called from an Aura component.

What is wrong with this code?

Line 1: class must be global8. Lines 1 and 6: class and method must be global

Line 6: method must be static

Line 8: method must first serialize the list to JSON before returning

NO.75 A developer created 2 class that implements the Queueable Interface, as follows:

As part of the deployment process, the developer is asked to create a corresponding test class. Which two actions should the developer take to successfully execute the test class? Choose 2 answers

Implement seeAllData=True to ensure the Queueable job is able to run in bulk mode.

Ensure the running user of the test class has, at I the View All permission on the Order object.

Enclose System.enqueueJob(new OrderQueueableJob ()] within Tess. and Test .stopTest (1.

Implement Test. isRunningTest() to prevent chaining jobs during test execution.

NO.76 Which three Visualforce components can be used to initiate Ajax behavior to perform partial page updates?
Choose 3 answers

<apex:commondLink>

<apex:commandButton>

<Apex:form>

<apex:actionsStatus>

<apex:actionSupport>

NO.77 Which scenario requires a developer to use an Apex callout
Instead of Outbound Messaging?

The target system uses a REST APL.

The target system uses a SCAP API.

The callout needs to be asynchronous.

The callout needs to be invoked from a flow.

NO.78 What is a benefit of JavaScript remoting over Visualforce Remote Objects?

Does not require any JavaScript code

Supports complex server-side application logic

Does not require any Apex code

Allows for specified re-render targets

NO.79 Universal Containers analyzes a Lightning web component and its Apex controller class that retrieves a list of contacts associated with an account. The code snippets are as follows:

Based on the code snippets, what change should be made to display the contacts’ mailing addresses in the Lightning web component?

Add a new method in the Apex controller class to retneve the mailing addresses separately and modify the Lightning web component to invoke this method.

Extend the lightning-datatable component in the Lightning web component to include a column for the MailingAddress field.

Modify the SOQL guery in the getAccountContacts method to include the MailingAddress field.

Modify the SOQL query in the getAccountContacts method to include the MailingAddress field and update the columns attribute in javascript file to add Mailing address fields.

NO.80 A developer sees test failures in the sandbox but not in production. No code or metadata changes have been actively made to either environment since the sandbox was created.
Which consideration should be checked to resolve the issue?

Ensure that Disable Parallel Apex Testing Is unchecked.

Ensure test classes are using SeeAllData = true.

Ensure the sandbox Is on the same release as production.

Ensure the Apex classes are on the same API version.

NO.81 Which technique can run custom logic when a Lightning web component is loaded?

Use an <aura:handler> init event to call a function.

Use the randersd loack { } method.

Call 52. engqueusiction and pass in the method to call.

Use the connectedCallback { } method.

NO.82 Consider the following code snippet:

As part of the deployment cycle, a developer creates the following test class:

When the test class runs, the assertion fails. Which change should the developer implement in the Apex test method to ensure the test method executes successfully? A)

B)

C)

D)

Option A

Option B

Option C

Option D

NO.83 A developer has a Visualforce page that automatically assigns ewnership of an Account to a queue upon save. The page appears to correctly assign ownership, but an assertion validating the correct ownership fails.
What can cause this problem?

The test class does not retrieve the updated value from the database,

The test class does not use the Bulk API for loading test data.

The test class does not use the seeallData=true= annotation.

The test class does not implement the Queueable interface.

NO.84 A Salesforce org has more than 50,000 contacts. A new business process requires a calculation that aggregates data from all of these contact records. This calculation needs to run once a day after business hours.
which two steps should a developer take to accomplish this?
Choose 2 answers
A)

B)

C)

D)

Option A

Option B

Option C

Option D

NO.85 A corporation has many different Salesforce orgs, with some different objects and some common objects, and wants to build a single Java application that can create, retrieve, and update common object records in all of the different orgs.
Which method of integration should the application use?

SOAP API with the Partner WSDL

Apex REST Web Service

SOAP API with the Enterprise WSDL

Metadata APT

NO.86 Universal Containers has an Apex trigger on Account that creates an Account Plan record when an Account is marked as a Customer.
Recently a record-triggered flow was added so that whenever an Account is marked as a Customer, a “Customer Since’ date field is updated with today’s date. Since the addition of the flow, two Account Plan records are created whenever the Account is marked as a Customer.
What might cause this to happen?

The Apex trigger does not use a static variable to ensure it only fires once.

The flow is configured to use an “Update Records’ element.

The Apex trigger is not bulk safe and calls insert inside of a for loop.

The flow is configured to evaluate when a record is created and every time it is edited.

NO.87 A company has a custom component that allows users to search for records of a certain object type by invoking an Apex Controller that returns a list of results based on the user’s input. When the search is completed, a searchComplete event is fired, with the results put in a results attribute of the event. The component is designed to be used within other components and may appear on a single page more than once.
What is the optimal code that should be added to fire the event when the search has completed?
A)

B)

C)

D)

Option A

Option B

Option C

Option D

NO.88 A company manages information about their product offerings in custom objects named Catalog and Catalog Item. Catalog Item has a master-detail field to Catalog, and each Catalog may have as many as 100,000 Catalog Items.
Both custom objects have a CurrencylsoCode text field that contains the currency code they should use. If a Catalog’s CurrencylsoCode changes, all of its Catalog Items’ CurrencylsoCodes should be changed as well.
What should a developer use to update the CurrencylsoCodes on the Catalog Items when the Catalog’s CurrencylsoCode changes?

A Database.Schedulable and Database.Batchacle class that queries the Catalog Item object and updates the Catalog Items if the Catalog CurrencylSoCode is different

An after insert trigger on Catalog that updates the Catalog Items if the Catalogs CurrencylsoCode is different

An after insert trigger on Catalog Item that updates the Catalog Items if the Catalog’s CurrencylsoCode is different

A Database. schedulable and Dazabase.Bazchacle class that queries the Catalog object and updates the Catalog Items if the Catalog CurrencylSoCode is different

NO.89 What should be added to the setup, in the location indicated, for the unit test above to create the controller extension for the test?

ApexPages.Standardcontroller sc = new ApexPages. Standardcontroller (acct.Id) ;AccountControllerExt extension = new AccountControllerExt(sc) ;om

AccountControllerExt extension = new AccountControllerExt (acct);

ApexPages.StandardController sc = new ApexPages.StandardController(acct);AccountcontrollerExt extension = new AccountControllerExt(sc);

AccountControllerExt extension = new AccountControllerExt (acct.Id) ;

NO.90 Users report that a button on a custom Lightning web component (LWC) is not saving the data they enter. The button looks to be clicked, but the LWC simply sits there, seemingly doing nothing.
What should the developer use to ensure error messages are properly displayed?

Add a try-catch block surrounding the DML statement.

Use the Database method with a110rNone Set to false.

Add the <apex:messages/> tag to the component.

Add JavaScript and HTML to display an error message.