Simulate the real MongoDB Certified Associate Developer exam with full-length timed sessions. Questions drawn proportionally from all 6 official blueprint domains — the same mix you'll face on test day.
Simulate real exam conditions
For the most realistic C100DEV simulation, start a 60 or 120-question session, put away all notes, set a timer matching the real exam duration (90 minutes), and commit to each answer before moving forward. This trains the time management and decision-making skills the real exam tests.
This free C100DEV mock exam uses the same question distribution as the real MongoDB Certified Associate Developer exam. Each session draws questions proportionally from all 6 official blueprint domains published by MongoDB, so the topic mix you see accurately reflects what you'll face on test day.
C100DEV Domain Distribution
MongoDB Overview and Document Model
Drivers, Tools, Transactions, and Search
Aggregation Framework
Indexing
CRUD Operations
Data Modeling
Every question is checked against the 2026 C100DEVexam objectives and published under the editorial oversight of an engineer with 12+ years' experience. These are original practice questions — not dumps — so you build real understanding rather than memorising answers.
Both the mock exam and practice test use the same question bank. The difference is in how you use them — and when to use each during your C100DEV study plan.
Practice test — for learning
Use the C100DEV practice test when you are studying a domain. Answer questions, read every explanation immediately, and build understanding. Do 10–30 questions per domain per session. This is your primary study tool for the first 4 weeks.
Go to practice test →Mock exam — for simulation
Use the C100DEV mock exam in the final 1–2 weeks before your test date. Complete a 60 or 120-question session without stopping, manage your time, then review all results at the end. This builds exam-day stamina and surfaces final weak spots.
Start 120-question mock →Try these sample questions from the mock exam bank. Commit to an answer before revealing the explanation.
An e-commerce application stores products in a collection. Each product has a variable number of attributes, such as 'size', 'color', or 'material'. Which data modeling approach best leverages MongoDB's flexible schema while maintaining query efficiency?
Select an answer to reveal the explanation
Refer to the exhibit. What is the impact of setting 'dynamic' to true in this Atlas Search index definition?
Select an answer to reveal the explanation
Which stage should be placed first in an aggregation pipeline to optimize performance when filtering a large collection based on an indexed field?
Select an answer to reveal the explanation
You have a collection of user activity logs where queries frequently filter by `userId` and sort by `timestamp` in descending order. Which single index definition provides optimal support for this query pattern without requiring an in-memory sort?
Select an answer to reveal the explanation
An application needs to update a user document in the 'users' collection. If the document does not exist, a new document must be inserted using fields from both the filter and the update document. Which parameter accomplishes this behavior in MongoDB?
Select an answer to reveal the explanation
An e-commerce application stores products with fluctuating attributes. Which data modeling pattern is most effective for handling diverse product schemas while maintaining efficient filtering?
Select an answer to reveal the explanation
Answer all 6 questions to see your domain score breakdown
Sitting the C100DEV under real exam conditions is a skill in itself. Candidates who underperform often do so not because of knowledge gaps, but because of poor time management or test anxiety. Use your final mock exam sessions to address both.
The C100DEV exam lasts 90 minutes. Do not spend more than 90 seconds on any single question on the first pass. Flag difficult ones and return to them after completing the rest.
On every question, immediately eliminate obviously wrong choices. Even if you are unsure between two options, narrowing to two doubles your odds. Most C100DEV distractors contain a subtle error — re-read the scenario constraint before committing to the answer that sounds most familiar.
MongoDB writes many C100DEV questions as realistic scenarios. Read the final sentence first — it tells you what is being asked. Then re-read the scenario with the question in mind to avoid wasting time on irrelevant details.
The real C100DEV is a mental marathon lasting 90 minutes. In the week before your exam, complete at least two full timed mock sessions on separate days to build concentration stamina. If you cannot stay focused for 90 minutes in practice, you will struggle on exam day.
Questions
~259
On the real exam
Time limit
90 min
Official exam duration
Passing score
700/1000
Scaled scoring
The C100DEV uses scaled scoring — your raw percentage correct is converted to a score out of 1000. Consistently scoring above 80% on mock exams puts you well above the 700/1000 threshold, giving you a buffer for any unexpected question types on the real exam.
Yes. Courseiva provides free C100DEV mock exam questions across all official exam domains. The platform includes timed simulation, per-domain score breakdown, missed-question review, and readiness tracking. No account required — free forever, supported by advertising.
The practice test is optimised for learning: you see explanations after each question immediately. The mock exam is optimised for simulation: you answer all questions under time pressure and review at the end. Use practice tests for studying and mock exams for benchmarking.
Aim for consistent scores of 80% or above on full-length C100DEV mock exams before booking your test date. The official passing score of 700/1000 corresponds to roughly 72–75% correct answers, so an 80% buffer accounts for difficulty variation and question styles on the real exam.
Most candidates who pass C100DEV on their first attempt complete 3–5 full-length mock exams in the two weeks before their test. This is enough to identify final weak spots, build stamina, and verify readiness without over-stressing or running out of fresh questions.
No — all Courseiva questions are original, AI-assisted and checked against the public MongoDB exam blueprints, with editorial oversight from an experienced network and security engineer. Exam dumps are memorised real exam questions shared illegally. Using dumps violates your MongoDB certification agreement and can result in your certification being revoked. Our questions make you genuinely competent, not just test-day lucky.
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