PD1 Apex Programming 2

Question 1

Which Apex collection type preserves insertion order and allows duplicate values?

Accepted Answer

List

Answer

A List in Apex is an ordered collection that allows duplicates, unlike Sets which are unordered and unique.

Question 2

What happens when an Apex trigger calls a future method?

Accepted Answer

It is queued and runs asynchronously after the transaction commits

Answer

Future methods are asynchronous and are enqueued to run after the current transaction successfully commits.

Question 3

Which keyword is used in Apex to prevent a class from being instantiated directly?

Accepted Answer

abstract

Answer

The `abstract` keyword marks a class that cannot be instantiated and must be extended by a concrete subclass.

Question 4

What is the maximum number of SOQL queries allowed per Apex transaction in a synchronous context?

Accepted Answer

100

Answer

Salesforce enforces a governor limit of 100 SOQL queries per synchronous Apex transaction.

Question 5

Which exception type is thrown when a DML operation violates a required field or validation rule?

Accepted Answer

DmlException

Answer

A DmlException is thrown when a DML operation fails due to validation rules, required fields, or other data issues.

(PD1) Salesforce Certified Platform Developer 1 Practice Test