Plat-Dev-201 Exam Preparation Material | Salesforce Certified Platform Developer

Prepare for the Plat-Dev-201 with reliable study materials, practice questions, and key exam insights.

Prepare for the Plat-Dev-201 Salesforce Certified Platform Developer exam with CertQueen's independently developed study resources. Review important concepts, practice scenario-based questions, and use clear explanations to identify areas that require further study.

Question#1

A custom object Trainer__c has a lookup field to another custom object Gym__c.
Which SOQL query will get the record for the Viridian City Gym and all it's trainers?

A. SELECT ID FROM Trainer_c WHERE Gym_r.Name = 'Viridian City Gym'
B. SELECT Id, (SELECT Id FROM Trainer_c FROM Gym_c WHERE Name = ‘Viridian City Gym"
C. SELECT Id, (SELECT Id FROM Trainers _r) FROM Gym_c WHERE Name = ‘Viridian City Gym'
D. SELECT Id, (SELECT Id FROM Trainers _c) FROM Gym_c WHERE Name = 'Viridian City Gym'

Explanation:
To query related child records in a lookup or master-detail relationship:
Use the parent object (Gym__c) to retrieve its child records (Trainer__c) through a nested query.
The child relationship name (Trainers__r) is derived from the lookup field.
Reference: SOQL Relationships

Question#2

Which two actions may cause triggers to fire? Choose 2 answers

A. Changing a user's default division when the transfer division option is checked
B. Updates to FeedItem
C. Cascading delete operations
D. Renaming or replacing a picklist entry

Explanation:
B. Updates to FeedItem:
Triggers can fire when FeedItem records are updated, such as posts on records or Chatter updates.
C. Cascading delete operations:
When a parent record is deleted, cascading delete operations on related child records can trigger child object triggers.
Why Not Other Options?
A: Changing a user's default division does not fire triggers.
D: Renaming or replacing a picklist entry does not fire triggers.
Reference: Trigger Events: https: //developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_triggers_context_variables_considerations.htm

Question#3

Universal Containers wants a list button to display a Visualforce page that allows users to edit multiple records.
Which Visualforce feature supports this requirement?

A. Standard Controller with Custom List Controller extension
B. Custom List Controller with recorasetvar page attribute
C. Controller Extension and <spex: listButton> tag
D. Standard controller and the recordsetvar page attribute

Explanation:
TherecordSetVarattribute of the<apex: page>tag allows a Visualforce page to handle multiple records, which is ideal for list buttons that display a page for bulk editing.
Why not other options?
A: Standard controllers can be extended, but usingrecordSetVaris the direct and best-supported
method for this scenario.
B: There is no such concept as a "Custom List Controller" in Visualforce. C: <spex: listButton>is not a valid Visualforce tag.
Visualforce Standard Controller with RecordSetVar

Question#4

A developer wants to improve runtime performance of Apex calls by caching results on the client.
What is the most efficient way to implement this and follow best practices?

A. Decorate the server-side method with @AuraEnabled (cacheable=true).
B. Call the setStorable () method on the action in the JavaScript client-side code.
C. Decorate the server-side method with @AuraEnabled (storable=true).
D. Set a cookie in the browser for use upon return to the page.

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
In Lightning Web Components, to cache the results of Apex methods on the client side, the Apex method should be annotated with @AuraEnabled (cacheable=true). This enables the Lightning Data Service to cache the method's response, improving performance by reducing server calls.
Reference: Lightning Web Components Developer Guide: Cacheable Apex Methods

Question#5

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

A. Renaming or replacing picklists
B. updating addresses using Mass Address updated tool
C. Importing data using the Data Loader and the Bulk API
D. Converting Leads to Contacts

Explanation:
Abefore triggerfires when records are inserted, updated, or deleted. Using the Data Loader or Bulk API to import data updates records, which triggers thebefore insertorbefore updateevents.
Not Suitable:
Option A: Renaming or replacing picklists does not trigger a record-level operation.
Option B: The Mass Address Update tool is not a record operation that triggersbeforetriggers.
Option D: Converting leads to contacts triggers lead conversion events, not directly related to Account triggers.
: Apex Triggers

Exam Code: Plat-Dev-201
Q & A: 204 Q&As         Updated:  Nov 03,2026

 

 Access Complete Plat-Dev-201 Preparation Material

What This Plat-Dev-201 Study Resource Helps You Do

Review Key Concepts

Review the technologies, products, processes, and practical skills covered by the current Plat-Dev-201 exam objectives.

Practice Scenario-Based Questions

Work through independently developed questions designed to strengthen your understanding of technical scenarios and decision-making.

Identify Knowledge Gaps

Use your results and the provided explanations to find weaker areas and focus your study more effectively.

How to Use This Plat-Dev-201 Preparation Material

Review the Exam Scope

Start by reviewing the topics covered by the Plat-Dev-201 exam. Compare them with the official exam objectives to understand the required technologies, operational tasks, and practical skills, then identify the areas that deserve the most attention.

Practice Independently

Complete a focused set of practice questions for each topic. On your first attempt, avoid referring to notes, answers, or other study resources so that you can evaluate your current understanding more accurately.

Study the Explanations

Review the answers and explanations after completing each practice session. Understand why the correct option is appropriate for the given scenario and why the other options may be incorrect or less suitable.

Close Knowledge Gaps

Keep track of incorrect answers, unfamiliar concepts, and weaker knowledge areas. Review these topics using official documentation and practical experience, then answer the related questions again to reinforce your understanding and monitor your progress.

Independent Plat-Dev-201 Preparation Resource

CertQueen independently develops its certification study materials for educational purposes. The practice questions are not copied from, recalled from, or presented as live or official exam questions.

CertQueen is not affiliated with, endorsed by, sponsored by, or authorized by any certification provider. Certification names, exam codes, product names, and related trademarks are the property of their respective owners and are referenced only for identification and educational purposes.

Exam Code: Plat-Dev-201
Q & A: 204 Q&As
Updated:  Nov 03,2026

 

 Access Complete Plat-Dev-201 Preparation Material