Free DEX-450 Practice Questions and Answers | Updated 2025

• Question 1

  A developer created a child Lightning web component nested inside a parent Lightning web component, parent component needs to pass a string value to the child component.In which two ways can this be accomplished?Choose 2 answers

  • The parent component can use a custom event to pass the data to the child component,
  • The parent component can use the Apex controller class to send data to the child component.
  • The parent component can invoke a method in the child component
  • The parent component can use a public property to pass the data to the child component.

  Show Answer Answer: A, D Next

• Question 2

  How should a developer write unit tests for a private method in an Apex class?

  • Use the SeeAllData annotation.
  • Add a test method in the Apex class.
  • Use the TestVisible annotation.
  • Mark the Apex class as global.

  Show Answer Answer: C Next

• Question 3

  A developer must create a DrawList class that provides capabilities defined in the Sortable and Drawable interfaces. public interface Sortable { void sort(); } public interface Drawable { void draw(); } Which is the correct implementation?

  • Public class DrawList implements Sortable, Implements Drawable { public void sort() { /*implementation*/} public void draw() { /*implementation*/} ]
  • Public class DrawList extends Sortable, Drawable { public void sort() { /*implementation*/} public void draw() { /*implementation*/} }
  • Public class DrawList implements Sortable, Drawable { public void sort() { /*implementation*/} public void draw() { /*implementation*/} }
  • Public class DrawList extends Sortable, extends Sortable, extends Drawable { public void sort() { /*implementation*/ } public void draw() { /* implementation */}

  Show Answer Answer: C Next

• Question 4

  A primaryid_c custom field exists on the candidate_c custom object. The filed is used to store each candidate's id number and is marked as Unique in the schema definition.As part of a data enrichment process. Universal Containers has a CSV file that contains updated data for all candidates in the system, the file contains each Candidate's primary id as a data point. Universal Containers wants to upload this information into Salesforce, while ensuring all data rows are correctly mapped to a candidate in the system.Which technique should the developer implement to streamline the data upload?

  • Create a Process Builder on the Candidate_c object to map the records.
  • Create a before Insert trigger to correctly map the records.
  • Update the primaryid__c field definition to mark it as an External Id
  • Upload the CSV into a custom object related to Candidate_c.

  Show Answer Answer: C Next

• Question 5

  What should be used to create scratch orgs?

  • Developer Console
  • Salesforce CLI
  • Workbench
  • Sandbox refresh

  Show Answer Answer: B Next