PD1 Apex Programming 5 — Questions and Answers
Question 1: Which annotation marks an Apex method as callable from a Lightning component via the Lightning Data Service or Wire service?
- @AuraEnabled (Correct answer)
- @RemoteAction
- @InvocableMethod
- @HttpGet
Correct answer: @AuraEnabled
@AuraEnabled exposes an Apex method to Aura and LWC components so it can be called from the client side.
Question 2: What is the purpose of the `Trigger.isBefore` context variable?
- Indicates whether the trigger is running in a test context
- Returns true when the trigger fires before the DML operation commits to the database (Correct answer)
- Returns true when a before delete event is firing
- Checks whether a validation rule has already executed
Correct answer: Returns true when the trigger fires before the DML operation commits to the database
Trigger.isBefore returns true when the trigger context is a before event, meaning the record changes have not yet been saved.
Question 3: Which Apex feature allows you to mock HTTP callouts in test methods?
- System.runAs()
- Test.setMock() (Correct answer)
- HttpRequest.setEndpoint()
- WebServiceMock interface
Correct answer: Test.setMock()
Test.setMock() registers an implementation of HttpCalloutMock or WebServiceMock so test methods can simulate HTTP responses.
Question 4: What is a common use case for the `@InvocableMethod` annotation?
- Exposing Apex logic to Flow Builder as an action (Correct answer)
- Calling Apex from a SOSL query
- Scheduling an Apex class to run at midnight
- Defining a REST API endpoint
Correct answer: Exposing Apex logic to Flow Builder as an action
@InvocableMethod exposes an Apex method so it can be called as an action from Flow Builder or Process Builder.
Question 5: Which governor limit governs the total number of records returned by all SOQL queries in a single transaction?
- 50,000 records
- 100,000 records (Correct answer)
- 500,000 records
- 1,000,000 records
Correct answer: 100,000 records
The total number of records retrieved by SOQL queries in a single transaction is limited to 50,000.
Question 6: In Apex, which System method is used to verify behavior as a specific user in a test class?
- System.setCurrentUser()
- System.runAs() (Correct answer)
- UserInfo.setUser()
- Test.setUser()
Correct answer: System.runAs()
System.runAs() executes a block of code in the context of a specified user, useful for testing sharing and permission-based logic.
Question 7: What is the result of calling `Database.rollback(savepoint)` in Apex?
- It commits all DML operations up to the savepoint
- It undoes all DML operations performed after the savepoint was created (Correct answer)
- It deletes all records inserted during the transaction
- It throws an exception if any DML has already committed
Correct answer: It undoes all DML operations performed after the savepoint was created
Database.rollback() reverts all DML changes made after the specified savepoint, restoring the database to that earlier state.
PD1 Apex Programming 5
Which annotation marks an Apex method as callable from a Lightning component via the Lightning Data Service or Wire service?