SALESFORCE-PD1 Practice Test 21 — 15 Questions

Question 1

A developer needs to invoke an asynchronous method from a standard synchronous Apex trigger. The asynchronous method must be annotated with which keyword?

Accepted Answer

@future. Methods intended to run asynchronously outside the current request must be annotated with @future.

Answer

@AuraEnabled

Answer

@InvocableMethod

Answer

@testVisible

Question 2

A developer wants to test an asynchronous future method. Where must the developer place the asynchronous code execution so that it runs synchronously and within the test context?

Accepted Answer

Between Test.startTest() and Test.stopTest(). Test.startTest() and Test.stopTest() bracket the code block where asynchronous processes like future methods, batch jobs, and queueables are forced to execute synchronously.

Answer

Inside a System.runAs() block

Answer

Within a try-catch block

Answer

Inside a Database.executeBatch block

Question 3

Which THREE techniques help prevent hitting governor limits when writing SOQL queries in Apex? Choose 3 answers.

Accepted Answer

Filtering queries using indexed fields (such as Id, Name, or external IDs) where possible.. Best practices include querying into collections, using bind variables, and filtering with indexed fields.

Answer

Omitting LIMIT clauses on large queries to ensure all records are fetched at once.

Answer

Placing SOQL queries inside helper methods called within loops.

Question 4

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: the framework tracks assignments to the property itself, not mutations to nested fields. Changing obj.field does not trigger re-render because the object reference is unchanged. To make nested changes reactive, reassign the property with a new object (e.g., this.obj = {...this.obj, field: value}) or decorate the property with @track.

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 5

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 on the <apex:page> tag, when set to 'true', includes standard Salesforce styling (CSS) in the Visualforce page. This enables the page to use the standard Salesforce look and feel.

Answer

lightningStylesheets="true"

Answer

applyHtmlTag="true"

Answer

sidebar="true"

Question 6

A developer is working with component styling and design tokens in Lightning Web Components. Which TWO practices apply when working with SLDS styling in LWC? (Choose TWO)

Accepted Answer

Prefer standard SLDS utility classes over custom hardcoded CSS rules for padding and margins.. Option B is correct because SLDS provides utility classes (such as slds-m-around_medium and slds-p-horizontal_small) that implement the design system's spacing scale consistently, so using them instead of hardcoded padding/margin values keeps components aligned with SLDS and themeable. Option E is correct because LWC exposes SLDS design tokens as CSS custom properties (for example var(--lwc-spacingMedium) or var(--lwc-colorBrand)), letting styles reference the design system's values and adapt to theming rather than duplicating literal values. Option A is wrong because sprinkling !important everywhere is an anti-pattern that fights LWC's style encapsulation and makes styles brittle; encapsulation is handled by scoping, not by !important. Option C is wrong because global stylesheets loaded via <link> in static resources are not the recommended way to style LWC components, which rely on component-scoped CSS files. Option D is wrong because shadow DOM styles cannot be overridden from a parent component's CSS without using supported styling hooks (::part or CSS custom properties), so directly reaching into shadow DOM is not a valid practice.

Answer

Use the !important declaration on every CSS rule to bypass Salesforce CSS encapsulation.

Answer

Write global CSS stylesheets in static resources and include them in every component using standard HTML <link> tags.

Answer

Override component-internal shadow DOM styles from a parent component's CSS file without styling hooks.

Question 7

A developer is building a Lightning Web Component and wants to iterate over a list of items in the HTML template. Which directive should be used?

Accepted Answer

<template for:each={items} for:item="item">. In LWC templates, iteration is performed with the for:each directive: <template for:each={items} for:item="item">. This is the standard LWC syntax for rendering a list, and it requires a for:item attribute to name the current item (and optionally for:index for the index). It is the only correct directive among the options for LWC.

Answer

Answer

<aura:iteration items="{!v.items}" var="item">

Answer

<apex:repeat value="{!items}" var="item">

Question 8

A developer needs to create a Lightning Web Component configuration file. What is the required file extension and naming convention?

Accepted Answer

componentName.js-meta.xml. The Lightning Web Component configuration file must be named `componentName.js-meta.xml` — the component's base name followed by `.js-meta.xml`. This file defines the component's metadata, including its API version, targets, and exposed properties, and the naming convention is mandatory for the framework to recognize it.

Answer

componentName.cmp-meta.xml

Answer

componentName.xml

Answer

componentName.config.xml

Question 9

A developer is using the Lightning Message Service and needs to unsubscribe from a message channel when a component is destroyed. In which lifecycle hook should unsubscribe be called?

Accepted Answer

disconnectedCallback. The disconnectedCallback lifecycle hook fires when a component is removed from the DOM, making it the correct place to unsubscribe from a Lightning Message Channel. Failing to unsubscribe here causes memory leaks and errors when messages arrive for a destroyed component.

Answer

connectedCallback

Answer

constructor

Answer

renderedCallback

Question 10

Which log level is best for finding logic flow issues without cluttering the log?

Accepted Answer

DEBUG.. DEBUG is the standard level for custom messages and logic tracing.

Answer

FINEST.

Answer

INFO.

Answer

WARN.

Question 11

What is the primary function of a scratch org?

Accepted Answer

A source-driven, ephemeral environment for testing and development.. A scratch org is a disposable, source-driven Salesforce environment intended for development, testing, and continuous integration. It is ephemeral, meaning it can be created, used, and then deleted, and its configuration is defined in a JSON file.

Answer

A backup tool for production data.

Answer

A permanent environment for staging.

Answer

A tool to migrate Change Sets.

Question 12

Which THREE criteria are best suited for choosing an Apex Trigger over a Flow?

Accepted Answer

Requirement for high-performance, low-latency execution. Complex bulk logic, heavy computational requirements, and performance-critical operations are best handled in Apex.

Answer

Simple field updates on the same record

Answer

Sending a simple email alert

Question 13

When is an Apex test run automatically executed?

Accepted Answer

During production deployment.. Tests are run automatically during deployment and package installation.

Answer

Every time a trigger runs.

Answer

When a record is saved.

Answer

When a user logs in.

Question 14

An application uses a SOSL search to find records across multiple objects. Which return type must be used to capture the results in Apex?

Accepted Answer

List>. SOSL search queries return a List of Lists of SObjects (List>), because a single search can return results across multiple different sObject types.

Answer

Map<String, List<SObject>>

Answer

SearchResult[]

Answer

List<SObject>

Question 15

A developer is building a custom Lightning Web Component and wants to communicate data from a child component up to its parent component. Which THREE steps are required? (Choose three.)

Accepted Answer

Dispatch the event using the this.dispatchEvent() method in the child.. To send data from a child LWC up to its parent, the child must first create the event object with the CustomEvent constructor, as in option D, because CustomEvent carries the payload in its detail property and defines the event name the parent will listen for. Option A is correct because the child must actually fire that event by calling this.dispatchEvent(event), which is the only way an LWC event is propagated to the parent's DOM listener. Option E is correct because the parent must register a listener on the child's tag in its HTML template using the on<eventname> directive (for example onmyevent), which binds the handler that receives the event and its detail data. Option B is incorrect because wire service adapters are used for reading Salesforce data, not for child-to-parent event communication, and no wire adapter is needed here. Option C is incorrect because @api exposes a public property for the parent to pass data down into the child, which is the opposite direction of the required child-to-parent flow.

Answer

Import the wire service adapter in the parent component.

Answer

Use the @api decorator on a parent property inside the child component.