Free Salesforce PDII Practice Exam with Questions & Answers | Set: 4

Comprehensive and Detailed 150 to 25042 words o43f Explanation:

In Lightning Web Components, external JavaScript libraries or CSS files stored in Static Resources must be imported using a specific syntax. The correct way to reference the resource URL is through the @salesforce/resourceUrl scoped module. Option A correctly follows this convention: import resourceName from '@salesforce/resourceUrl/staticResourceName'. This statement provides the component with the URL string pointing to the resource.

It is important to note that the import statement only gives you the URL of the file. To actually load and execute the JavaScript within the component, you would then need to use the loadScript function from the lightning/platformResourceLoader module, typically within the renderedCallback() lifecycle hook.

Option B is incorrect because resource imports are default imports, not named imports. Option C uses Aura framework syntax ($A.get), which is not supported in LWC. Option D uses a syntax that resembles Aura's ltng:require tag, which does not exist in the LWC template syntax. Therefore, Option A is the essential first step for any LWC to identify and eventually load a static resource.

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To retrieve record data in a Lightning Web Component using the Lightning Data Service (LDS), the developer must use the @wire decorator with the getRecord wire adapter.

Option D provides the correct syntax. The @wire decorator requires the adapter name (getRecord) and a configuration object. The configuration must include the recordId and either the fields or layoutTypes to be retrieved. By using the $ prefix (e.g., '$recordId'), the developer makes the property "reactive." This means that whenever the value of recordId or fields changes, the wire service automatically re-provisions the data from Salesforce.

Options A and C are incorrect because @api is used to expose public properties, not for wiring data. Option B is incorrect because getRecord requires a field list or layout type to know which data points to fetch from the server. Using the reactive $fields ensures that the component remains flexible and can load different field sets as defined by its parent component.

In Aura components, Salesforce provides specific interfaces that "inject" context into the component automatically. The developer is already using force:hasRecordId, which automatically populates a recordId attribute with the ID of the current record.

To get the API Name of the sObject (e.g., "Account" or "Contact") without writing Apex code or requiring manual configuration in the App Builder, the developer should implement force:hasSObjectName (Option D). When this interface is added to the implements attribute, the framework automatically provides an attribute named sObjectName to the component.

This is the most efficient solution because:

It is purely declarative and handled by the Lightning framework.

It requires zero Apex code, meaning there is no need for additional unit tests or code coverage (satisfying the requirement "without requiring additional test coverage").

It makes the component truly reusable; you can drop it on an Account page, a Contact page, or any custom object page, and it will immediately know which object it is currently displaying.

Options A and B require manual configuration or hardcoding, which reduces reusability. Option C requires an Apex call, which adds complexity and necessitates writing test classes for coverage.

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The primary issue in this code snippet is a violation of basic variable assignment rules in Apex when dealing with SOQL results. In the line Account a = [SELECT Id, Name FROM Account ... ], the code attempts to assign the result of a query directly 3to a single SObject variable (Account a).

In Apex, a SOQL query assigned to a single SObject variable must return exactly one record. If the query returns zero records, it throws a System.QueryException: List has no rows for assignment. If the query returns more than one record, it throws a System.QueryException: List has more than one row for assignment (Option A). Since the prompt explicitly states that five Accounts were created today and the query is not filtered to a single unique ID, the query will return five records. Even though there is a LIMIT 5 clause, that only caps the results at five; it does not ensure only one is returned. To fix this, the result should be assigned to a List or the query should be filtered to return exactly one row.

While the code also violates the "SOQL in a loop" best practice, it would not hit the LimitException (Option C) in this specific case because the loop only runs 10 times (10 contacts), and the limit is 100 queries. The runtime assignment error occurs before any governor limits are breached.

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The lightning-record-edit-form i7s a powerful LWC component that automates record creation and editing. 8It handles field-level security, metadata retrieval, and data persistence automatically. However, for a complete user experience, it requires specific sub-components to handle feedback. While lightning-input-field handles inline validation (like a missing required field), it does not automatically display "top-level" error messages, such as validation rule failures or system errors returned from the server.

To display these errors, the developer must include the lightning-messages (Option A) component inside the lightning-record-edit-form tags. When a form submission fails, the lightning-messages component automatically catches the error payload returned by the Lightning Data Service and renders it in a user-friendly format at the top of the form (or wherever it is placed).

Option B is not a standard Base Lightning Component name. Options C and D belong to the Visualforce and Aura frameworks, respectively, and cannot be used within a Lightning Web Component template. Including lightning-messages is a required step for any robust implementation of lightning-record-edit-form to ensure users are informed of why a record could not be saved.

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The "SOQL query not selective enough" error occurs when a query on an object with a large volume of records (typically over 200,000) does not use a filtered index to narrow down the result set effectively. In Sales1force,2 the query optimizer must be able to use an index to scan a small enough percentage of the total records to maintain performance. When a query filters on a non-indexed field, the system is forced to perform a full table scan, which triggers this exception to prevent performance degradation.

To resolve this, the developer must ensure that the field used in the WHERE clause is indexed. Marking a custom field as an "External ID" or "Unique" automatically creates a custom index on that field. By marking ERP_Number__c as an External ID, the platform generates a underlying database index, allowing the query optimizer to quickly locate matching records without scanning the entire table. While the LIKE operator with a trailing wildcard (e.g., 'Text%') can utilize an index, it will only be considered "selective" if the filter narrow the results below the platform's selectivity thresholds (typically 10% of the first million records). Making the field an External ID is the standard programmatic solution to provide the necessary indexing for selectivity. Option A is incorrect because moving a non-selective query to an asynchronous process does not change the fact that it is non-selective; it will still fail.

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When building global applications in Lightning Web Components (LWC), developers should never hardcode locale-specific logic. Salesforce provides a robust Internationalization (i18n) service that exposes the current user's regional settings directly to the JavaScript controller.9

The correct approach is to import the @salesforce/i18n module (Option D). This module contains several properties that are automatically populated based on the logged-in user's Salesforce profile settings. Specifically, the firstDayOfWeek property 10returns an integer (0 for Sunday, 1 for Monday, etc.) that corresponds to the cultural standard of the user's locale.

Using this built-in property is superior to other methods because:

It requires no Apex callouts or SOQL queries (unlike Option A and C).

It is automatically maintained by Salesforce; as global standards change, the platform updates the i18n values, ensuring the component remains compliant without developer intervention.

It avoids the maintenance overhead of creating custom metadata (Option B) to map every possible locale to a starting day.

By leveraging @salesforce/i18n/firstDayOfWeek, the developer ensures the calendar component is truly global and provides a native, localized experience for every user regardless of their country.

The Visualforce View State is a hidden form field that maintains the state of the page (including controller variables) between server requests. 9Salesforce imposes a strict 135KB limit on the View State. When a page handles large amounts of 10data—such as large lists of records or complex objects—the serialized size of the controller variables can easily exceed this limit, resulting in a runtime error for the user.

To correct these errors, the developer should use the transient keyword (Option C). Marking a variable as transient prevents it from being serialized into the View State. This is the standard best practice for any data that does not need to be maintained across "postbacks" (actions that refresh the page or part of the page). Common candidates for the transient keyword include:

Large lists of records retrieved for display only.

Temporary variables used for calculations during a single request.

Summary data that can be easily re-queried if needed.

Option A relates to security, not performance. Option B (private variables) does not exclude variables from the View State; only static and transient variables are excluded. Option D relates to SOQL governor limits, which are independent of the View State size. By judiciously using transient, the developer keeps the page weight low and ensures a smooth user experience in production environments with real-world data volumes.

When a Salesforce organization uses the Translation Workbench, picklist values can be translated into multiple languages. By default, a SOQL query returns the "Master" or API value of a picklist field, which is usually in English. If a developer needs the returned data to reflect the translated labels based on the current user's language settings, they must use the toLabel() function within the SOQL SELECT statement.

Using SELECT toLabel(Products__c) FROM Account (Option A) tells the Salesforce query engine to look up the translated value for each picklist entry in the result set before returning it to Apex. This is particularly useful for UI components or reports where the user expects to see values in their native tongue. It works for both standard picklists and multi-select picklists.

Other options are incorrect because they do not exist as standard Apex features. There is no translate() method on SObject records (Option B), and Apex does not allow you to manually "set the locale" on individual records to trigger translation (Option C). There is also no "locale clause" in SOQL syntax (Option D). Using toLabel() is the platform-standard, most efficient way to handle localized data retrieval directly within the data access layer.

The issue described involves hitting DML limits due to a high volume of records (over 10,000) being processed in a single transaction. In Salesforce, a single synchronous transaction or a standard Scheduled Apex job has strict governor limits on the number of DML statements (150) and the total number of records processed (10,000 for DML rows).

To resolve this, the developer should implement the Database.Batchable interface. Batch Apex is specifically designed to handle large data volumes by breaking the processing into smaller, manageable chunks (batches) of records (default 200). Each batch runs within its own transaction context, resetting the governor limits for that specific batch. This prevents the "Too many DML rows" exception. While Queueable (Option D) and @future (Option C) provide asynchronous processing, they are not inherently designed to iterate over large datasets in the same robust, governor-limit-safe manner as Batch Apex, particularly when the record count exceeds the thousands.