PDII Valid Test Objectives | Mock PDII Exam

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Salesforce Platform Developer II Sample Questions (Q38-Q43):

NEW QUESTION # 38
Which use case can be performed only by using asynchronous Apex?

A. Updating a record after the completion of an insert
B. Calling a web service from an Apex trigger
C. Making a call to schedule a batch process to complete in the future
D. Querying tens of thousands of records

Answer: B

Explanation:
Asynchronous Apex is a way of executing code in a separate thread from the main execution context. This allows you to perform long-running or resource-intensive operations without blocking the user interface or exceeding the governor limits. Some use cases that can be performed only by using asynchronous Apex are: calling a web service from an Apex trigger, sending email messages, performing complex calculations, and processing large data sets. Querying tens of thousands of records, scheduling a batch process, and updating a record after an insert can be done with synchronous Apex as well, depending on the context and requirements. Reference: [Asynchronous Apex], [Apex Triggers]

NEW QUESTION # 39
Universal Containers develops a Visualforce page that requires the inclusion of external JavaScript and C55 files. They want to ensure efficient loading and caching of the page.
Which feature should be utilized to achieve this goal?

A. RemoteAction
B. PageBlockTable
C. ActionFunction
D. Static resources

Answer: D

Explanation:
Static resources are ideal for efficient loading and caching of external files in Visualforce. They allow bundling and minimizing HTTP requests.
References: Using Static Resources

NEW QUESTION # 40
Which code snippet represents the optimal Apex trigger logic for assigning a Lead's Region based on its PostalCode, using a custom Region__c object?

A. Region__c = reg.Region_Name__c;
}
B. Region__c = r.Region_Name__c;
}
}
}
C. Java
Set<String> zips = new Set<String>();
for(Lead l : Trigger.new) {
if(l.PostalCode != Null) {
zips.add(l.PostalCode);
}
}
List<Region__c> regions = [SELECT Zip_Code__c, Region_Name__c FROM Region__c WHERE Zip_Code__c IN :zips]; Map<String, String> zipMap = new Map<String, String>(); for(Region__c r : regions) { zipMap.put(r.Zip_Code__c, r.Region_Name__c);
}
for(Lead l : Trigger.new) {
if(l.PostalCode != Null) {
D. Region__c = zipMap.get(l.PostalCode);
}
}
E. Java
for (Lead l : Trigger.new) {
Region__c reg = [SELECT Region_Name__c FROM Region__c WHERE Zip_Code__c = :l.
PostalCode];
F. Java
Set<String> zips = new Set<String>();
for(Lead l : Trigger.new) {
if(l.PostalCode != Null) {
zips.add(l.PostalCode);
}
}
for (Lead l : Trigger.new) {
List<Region__c> regions = [SELECT Zip_Code__c, Region_Name__c FROM Region__c WHERE Zip_Code__c IN :zips]; for (Region__c r : regions) { if(l.PostalCode == r.Zip_Code__c) {
G. Region__c = r.Region_Name__c;
}
}
}
H. Java
Set<String> zips = new Set<String>();
for(Lead l : Trigger.new) {
if(l.PostalCode != Null) {
zips.add(l.PostalCode);
}
}
for(Lead l : Trigger.new) {
List<Region__c> regions = [SELECT Zip_Code__c, Region_Name__c FROM Region__c WHERE Zip_Code__c IN :zips]; for(Region__c r : regions) { if(l.PostalCode == r.Zip_Code__c) {

Answer: C

Explanation:
The "optimal" Apex trigger logic is defined by its bulkification and strict adherence to Salesforce governor limits. In Apex, a trigger can process up to 200 records in a single batch. If a developer places a SOQL query inside a loop, the transaction will fail with a System.LimitException if more than 100 records are processed, as the limit is 100 synchronous SOQL queries.
Option A follows the industry-standard "Bulkify, Query, and Map" design pattern:
* Collection: It iterates through the input records once to gather all relevant search criteria (Zip Codes) into a Set.
* External Query: It performs a single SOQL query outside of any loop to fetch all matching Region__c records for the entire batch. This is the most critical step for scalability.
* Mapping: It organizes the results into a Map<String, String> (Zip Code to Region Name). Maps provide $O(1)$ constant-time lookup performance.
* Final Assignment: It iterates through the Leads a second time and assigns the Region using the Map.
Options B, C, and D are all anti-patterns. Option C is the most dangerous, as it executes a query for every single record. Options B and D are slightly better but still redundant, as they execute a query inside a loop that retrieves data already retrieved in previous iterations. Only Option A ensures the code is efficient, bulk-safe, and stays well within governor limits even under heavy data loads.

NEW QUESTION # 41
A Visualforce page contains an industry select list and displays a table of Accounts that have a matching value in their Industry field.

When a user changes the value in the industry select list, the table of Accounts should be automatically updated to show the Accounts associated with the selected industry, What is the optimal way to implement this?

A. Add an <apex:actionFunction> within the <apax:selecList>.
B. Add an <apex:actionFunction> within the <apex:selectOptions>.
C. Add an <apex:actionsupport> within the <apex:selecList>.
D. Add an <apex:actionsupport> within the <apex:selectOptions>.

Answer: C

Explanation:
The optimal way to implement the requirement is to add an apex:actionsupport within the apex:selectList. The apex:actionsupport component adds AJAX support to another component, allowing the component to be refreshed asynchronously by the server when a particular event occurs, such as a button click or mouseover. By adding an apex:actionsupport within the apex:selectList, the Visualforce page can invoke the controller method that performs the query based on the selected industry and re-render the table of Accounts without refreshing the whole page. The apex:actionsupport component can also specify the event that triggers the action, such as onchange, and the reRender attribute that specifies the ID of the component to be redrawn, such as the table. Adding an apex:actionFunction within the apex:selectList would not work, as the apex:actionFunction component defines a JavaScript function that can invoke a controller method. The apex:actionFunction component does not have an event attribute and cannot be triggered by changing the value in the select list. Adding an apex:actionsupport within the apex:selectOptions would not work, as the apex:selectOptions component defines the options to be displayed in the select list and does not support the event attribute. Adding an apex:actionFunction within the apex:selectOptions would not work, as the apex:actionFunction component defines a JavaScript function that can invoke a controller method. The apex:actionFunction component does not have an event attribute and cannot be triggered by changing the value in the select list. Reference: [apex:actionsupport], [apex:actionFunction], [apex:selectList], [apex:selectOptions]

NEW QUESTION # 42
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?

A. Create a new j.sdom instance for each test.11
B. Create a new describe block for each test.10
C. Add a teardown block to reset the DOM after each test.9
D. Reset the DOM after each test with the afterEach() method.12

Answer: D

Explanation:
Comprehensive and Detailed 150 to 14250 words of Explanation:
Jest tests for Lightning Web Components (LWC) run in a virtual browser environment called JSDOM. In this environment, the document.body persists across individual test cases (it or test blocks) within a single test file.
If a developer mounts a component to the DOM in the first test and doesn't remove it, the component's state and DOM elements will still be present when the second test starts, leading to "leaked" data and unreliable test results.
To ensure test isolation-which is critical for testing conditional rendering-the developer must clean up the DOM after every test. The standard best practice is to use the afterEach() hook (Option D). Within this hook, the developer should execute a loop that removes all child elements from document.body. This ensures that each test begins with a completely "clean slate." Option A is too vague; "teardown block" is a general term, but afterEach() is the specific Jest implementation.
Option B is for organizing tests but doesn't handle DOM cleanup. Option C is unnecessary as the LWC testing utility manages the JSDOM instance. By using afterEach() to reset the DOM, the developer can accurately verify that the component correctly shows or hides child components based on the specific inputs provided in each individual test case.

NEW QUESTION # 43
......

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