DEX-450 Premium Exam Engine – Download Free PDF Questions [Q104-Q119]

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DEX-450 Premium Exam Engine – Download Free PDF Questions

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QUESTION 104
What should a developer use to fix a Lightning web component bug in a sandbox?

Developer Console

VS Code

Force.com IDE

Execute Anonymous

QUESTION 105
A developer creates a method in an Apex class and needs to ensure that errors are handled properly.What would the developer use? (There are three correct answers.)

ApexPages.addErrorMessage()

A custom exception

.addError()

Database.handleException()

A try/catch construct

QUESTION 106
A developer in a Salesforce org with 100 Accounts executes the following code using the Developer console:Account myAccount = new Account(Name = ‘MyAccount’);Insert myAccount;For (Integer x = 0; x < 150; x++)
{Account newAccount = new Account (Name=’MyAccount’ + x);try {Insert newAccount;} catch (Exception ex) {System.debug (ex) ;}}insert new Account (Name=’myAccount’);How many accounts are in the org after this code is run?

101

100

102

252

QUESTION 107
Which three web technologies can be integrated into a Visualforce page? Choose 3 answares

HTML (Missed)

Java

PHP

CSS (Missed)

JavaScript (Missed)

QUESTION 108
A lead developer creates an Apex interface called “Laptop”. Consider the following code snippet:

How can a developer use the Laptop Interface within the Silvertaptop class?

@Extends(class=Laptop”)
public class SilverLaptop

public calss SilverLaptop extends Laptop

@Interface (class=”Laptop”)
public class SilverLaptop

public class Silverlaptop implements Laptop

QUESTION 109
developer created this Apex trigger that calls MyClass .myStaticMethod: trigger myTrigger on Contact(before insert) ( MyClass.myStaticMethod(trigger.new, trigger.oldMap); } The developer creates a test class with a test method that calls MyClass.mystaticMethod, resulting in 81% overall code coverage. What happens when the developer tries to deploy the trigger and two classes to production, assuming no other code exist?

The deployment fails because the Apex trigger has no code coverage.

The deployment fails because no assertions were made in the test method.

The deployment passes because the Apex code has required (>75%) code coverage.

The deployment passes because both classes and the trigger were included in the deployment.

QUESTION 110
A developer writes a before insert trigger.How can the developer access the incoming records in the trigger body?

By accessing the Trigger.new context variable.

By accessing the Trigger.newRecords context variable.

By accessing the Trigger.newMap context variable.

By accessing the Tripper.newList context variable.

QUESTION 111
Cloud Kicks has a multi-screen flow that its call center agents use when handling inbound service desk calls.
At one of the steps in the flow, the agents should be presented with a list order numbers and dates that are retrieved from an external order management system in real time and displayed on the screen.
What should a developer use to satisfy this requirement?

An Apex controller

An invocable method

An outbound message

An Apex REST class

To retrieve data from an external system in real time during a flow, the developer should use an invocable method.
Option B: An invocable method
public with sharing class OrderService {
@InvocableMethod(callout=true)
public static List<OrderInfo> getOrderData(List<String> inputs) {
// Callout to external system and return data
}
}
Reference:
“To invoke Apex methods that perform callouts from a flow, use the @InvocableMethod annotation with callout=true.”
– Salesforce Developer Guide: Invocable Methods
Why Other Options Are Incorrect:
Option A: An Apex controller is typically used with Visualforce pages or Aura components, not directly with Flows.
Option C: An outbound message sends data to external systems but does not retrieve data.
Option D: An Apex REST class exposes endpoints for external systems to call into Salesforce, not for Salesforce to call out.

QUESTION 112
Which code displays the contents of a Visualforce page as a PDF?

<apex:page contentType-“applic*ticn/pdf”>

<apex:page contentType-“pdf”>

<apex:page renderAs-wpdf”>

<apex:page renderAs=”application/pdf”>

QUESTION 113
A developer considers the following snippet of code:

Based on this code, what is the value of x?

QUESTION 114
A lead object has a custom field Prior_Email__c. The following trigger is intended to copy the current Email into the Prior_Email__c field any time the Email field is changed:

Which type of exception will this trigger cause?

A null reference exception

A compile time exception

A DML exception

A limit exception when doing a bulk update

QUESTION 115
Refer to the component code 9fd requirements below:

Requirements
* For mobile devices. the information should display in three rows.
* For desktops and tablets, the information should display in a single row.
Requirement 2 is not displaying as desired.
Which option has the correct component code to meet the requirements for desktops end and tablets?

QUESTION 116
When importing and exporting data into Salesforce, which two statements are true? Choose 2 answers

Developer and Developer Pro sandboxes have different storage limits.

Bulk API can be used to bypass the storage limits when importing large data volumes in development environments.

Bulk API can be used to import large data volumes in development environments without bypassing the storage limits.

Data import wizard is an application that is instalied on your computer.

Option A: Developer and Developer Pro sandboxes have different storage limits.
True.
Developer Sandbox:
Provides 200 MB of data storage and 200 MB of file storage.
Developer Pro Sandbox:
Provides 1 GB of data storage and 1 GB of file storage.
The storage limits affect how much data you can import into these environments.
The Bulk API is designed to handle large data volumes efficiently.
However, in development environments like sandboxes, you cannot bypass storage limits; the storage limits still apply.
You can use Bulk API to import data up to the storage limit of your sandbox.
Storage limits in Salesforce environments are enforced and cannot be bypassed using the Bulk API or any other means.
Attempting to import data beyond the storage limit will result in errors.
The Data Import Wizard is a web-based tool within Salesforce, accessible via Setup.
It does not require any installation on your computer.
Reference:
Sandbox Storage Limits
Option C: Bulk API can be used to import large data volumes in development environments without bypassing the storage limits.
True.
Bulk API Developer Guide
Incorrect Options:
Option B: Bulk API can be used to bypass the storage limits when importing large data volumes in development environments.
False.
Storage Limits Enforcement
Option D: Data Import Wizard is an application that is installed on your computer.
False.
Data Import Wizard

QUESTION 117
Which action causes a before trigger to fire by default for Accounts?

Renaming or replacing picklist

Importing data using the Data Loader and the Bulk API

Converting Leads to Contact accounts

Updating addresses using the Mass Address update tool

QUESTION 118
Which two queries can a developer use in a visualforce controller to protect against SOQL injection Vulnerabilities? Choose 2 answers

String qryName = ‘%’ + String.enforceSecurityChecks(name)+ ‘%’; String qryString = ‘SELECT Id FROM Contact WHERE Name LIKE :qryNAme’; List queryResults = Database.query(qryString);

String qryName = ‘%’ + name ‘%’; String qryString = ‘SELECT Id FROM Contact WHERE Name LIKE :qryNAme’; List queryResults = Database.query(qryString);

String qryName = ‘%’ + String.escpaeSingleQuotes(name)+ ‘%’; String qryString = ‘SELECT Id FROM Contact WHERE Name LIKE :qryNAme’; List queryResults = Database.query(qryString);

String qryString = ‘SELECT Id FROM Contact WHERE Name LIKE :qryNAme’; List queryResults = Database.query(qryString);

QUESTION 119
Which standard field is required when creating a new contact record?

LastName

Name

AccountId

FirstName

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