Salesforce DEX-450 Online Practice Questions and Exam Preparation

Salesforce DEX-450 Online Questions & Answers

• Question 171:

  In the code below, what type does Boolean inherit from?

  Boolean b= true;

  A. Enum
  B. Object
  C. String
  D. Class
  B. Object

• Question 172:

  What is a characteristic of the Lightning Component Framework? Choose 2 answers:

  A. It has an event-driven architecture.
  B. It works with existing Visualforce pages.
  C. It includes responsive components.
  D. It uses XML as its data format.
  A. It has an event-driven architecture.
  C. It includes responsive components.

• Question 173:

  How should a developer avoid hitting the governor limits in test methods?

  A. Use @TestVisible on methods that create records.
  B. Use Test.loadData() to load data from a static resource.
  C. Use @IsTest (SeeAllData=true) to use existing data.
  D. Use Test.startTest() to reset governor limits.
  D. Use Test.startTest() to reset governor limits.

• Question 174:

  What is a capability of cross-object formula fields? Choose 3 answers

  A. Formula fields can reference fields from master-detail or lookup parent relationships.
  B. Formula fields can expose data the user does not have access to in a record.
  C. Formula fields can be used in three roll-up summaries per object.
  D. Formula fields can reference fields in a collect of records from a child relationship.
  E. Formula fields can reference fields from objects that are up to 10 relationships away.
  A. Formula fields can reference fields from master-detail or lookup parent relationships.
  B. Formula fields can expose data the user does not have access to in a record.
  E. Formula fields can reference fields from objects that are up to 10 relationships away.

• Question 175:

  The account object has a custom percent field, rating, defined with a length of 2 with 0 decimal places. An account record has the value of 50% in its rating field and is processed in the apex code below after being retrieved from the database with SOQL public void processaccount(){ decimal acctscore = acc.rating__c * 100; }

  What is the value of acctscore after this code executes?

  A. 5
  B. 50
  C. 500
  D. 5000
  C. 500

• Question 176:

  Which standard field needs to be populated when a developer inserts new Contact records programmatically?

  A. Accountld
  B. Name
  C. LastName
  D. FirstName
  C. LastName

• Question 177:

  A developer creates a custom controller and custom Visualforce page by using the following code block:public class myController {public String myString;public String getMyString() {return 'getmyString';}public String getStringMethod1() {return myString;}public String getStringMethod2() {if (myString == null)myString = 'Method2';return myString;}}{!myString}, {!StringMethod1}, {!StringMethod2}, {!myString}

  What does the user see when accessing the custom page?

  A. GetMyString , , Method2 , getMystring
  B. , , Method2 , getMyString
  C. , , Method2,
  D. GetMyString , , ,
  A. GetMyString , , Method2 , getMystring

• Question 178:

  What are two benefits of the Lightning Component framework? (Choose two.)

  A. It simplifies complexity when building pages, but not applications.
  B. It provides an event-driven architecture for better decoupling between components.
  C. It promotes faster development using out-of-box components that are suitable for desktop and mobile devices.
  D. It allows faster PDF generation with Lightning components.
  B. It provides an event-driven architecture for better decoupling between components.
  C. It promotes faster development using out-of-box components that are suitable for desktop and mobile devices.

• Question 179:

  Which action can a developer take to reduce the execution time of the following code?

  List allaccounts = [select id from account]; list allcontacts = [select id, accountid from contact]; for (account a :allaccounts){ for (contact c:allcontacts){ if(c.accountid = a.id){ //do work } } }

  A. Use a map for allaccounts
  B. Add a group by clause to the contact SOQL
  C. Put the account loop inside the contact loop
  D. Create an apex helper class for the SOQL
  A. Use a map for allaccounts

• Question 180:

  A developer has JavaScript code that needs to be called by controller functions in multiple Aura components by extending a new abstract component.

  Which resource in the abstract Aura component bundle allows the developer to achieve this?

  A. helper.js
  B. controllers
  C. superRender.js
  D. renderer.js
  A. helper.js