SALESFORCE-PD1 Developer Fundamentals Practice Question
Which TWO data types can be used as keys in an Apex Map? Choose 2 answers.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Id
Primitive data types like String, ID, and Integer can be used as map keys in Apex.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Blob
Why it's wrong here
Blobs are not supported as map keys.
- ✓
Id
Why this is correct
IDs are frequently used as map keys for sObject mapping.
- ✗
List<String>
Why it's wrong here
Collections like lists cannot be used as map keys.
- ✗
SObject
Why it's wrong here
SObjects cannot be used directly as map keys.
- ✓
String
Why this is correct
Strings are valid and commonly used map keys.
About these practice questions
Courseiva writes every SALESFORCE-PD1 question from scratch — 493 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Salesforce exam blueprint
This SALESFORCE-PD1 practice question is part of Courseiva's free Salesforce certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SALESFORCE-PD1 exam.