Free C100DEV practice test — 259+ C100DEV practice questions with detailed explanations across all 6 official C100DEV exam domains. Every set is scored and drawn from the live question bank — so you practise exactly what the exam tests, not outdated dumps.
Courseiva includes 259+ MongoDB Certified Associate Developer practice questions across the official exam domains.
Feature
Courseiva
This free C100DEV practice test mirrors the structure and difficulty of the real MongoDB Certified Associate Developer exam. Every question is written against the official 2026 exam blueprint published by MongoDB, ensuring you practise exactly what the exam tests — not last year's objectives.
The C100DEV blueprint is divided into 6weighted domains. Questions on this page are distributed proportionally across each domain, so the mix you see here reflects the same weighting you'll face on exam day. High-weight domains like MongoDB Overview and Document Model and Drivers, Tools, Transactions, and Search contribute the most questions, meaning focused practice on these areas gives you the highest return on study time.
C100DEV Exam Blueprint — 6 Domains
MongoDB Overview and Document Model
Drivers, Tools, Transactions, and Search
Aggregation Framework
Indexing
CRUD Operations
Data Modeling
20 numbered sets, 6 domain question banks, and targeted sessions — every page is a unique set of questions.
Each chapter page covers one topic in depth — theory, key concepts, and focused practice questions. Use these to close knowledge gaps before returning to full practice tests.
Getting the most from practice questions requires more than just clicking through answers. Here is the study method used by candidates who pass C100DEV on their first attempt:
Answer before revealing
Read each C100DEV question fully, eliminate obviously wrong choices, then commit to an answer before clicking to reveal. This active recall process is what builds lasting knowledge.
Read every explanation
Even when you answer correctly, read the full explanation. Knowing WHY the right answer is correct — and why the distractors are wrong — is what separates a 750 score from a 900 score.
Track weak domains
Note which C100DEV domains you get wrong most often. Then do a targeted 20-30 question session focused only on that domain until your accuracy improves.
Simulate exam pacing
The real C100DEV is 90 minutes long. Use timed sessions to build the concentration and pacing you will need on exam day.
Most candidates who pass C100DEV on their first attempt report doing between 400 and 800 practice questions over 4–8 weeks of preparation. With 259+ questions in the Courseiva bank, you have more than enough material to build that repetition without seeing the same question twice.
Answer each question to reveal the full explanation and correct answer. This starter set is drawn from all 6 exam domains in blueprint proportion. Use the session selector to start a longer focused practice run.
What is the primary benefit of the 'Bucket Pattern' in MongoDB data modeling?
Select an answer to reveal the explanation
Which tool is primarily recommended for performing binary backups and restores of a MongoDB deployment?
Select an answer to reveal the explanation
You are processing a large collection of user sessions. You need to calculate the average duration of sessions grouped by 'userId', but you must filter out any sessions lasting less than 5 seconds before performing the grouping. Which stage order is most efficient?
Select an answer to reveal the explanation
You are designing a schema for a social media platform where users have an array of 'tags' and an array of 'mentions'. You attempt to create an index on { tags: 1, mentions: 1 }. What is the most likely outcome of this operation?
Select an answer to reveal the explanation
A logistics application stores shipment documents in the 'shipments' collection. Each document has a 'packages' array of embedded subdocuments, each with a 'trackingCode' field. A developer needs to remove only the embedded subdocument whose 'trackingCode' equals 'TRK-9981' from the document with '_id' 42, leaving all other packages untouched. Which update operation should be used?
Select an answer to reveal the explanation
What happens if a document grows beyond the 16MB limit due to an 'Embedding' design choice?
Select an answer to reveal the explanation
What is the primary advantage of the Subset pattern in MongoDB data modeling?
Select an answer to reveal the explanation
When modeling with MongoDB, why should you avoid 'unbounded' growth in an array field?
Select an answer to reveal the explanation
Which of the following describes the behavior of a 'causally consistent' session in MongoDB?
Select an answer to reveal the explanation
When designing a schema for a one-to-many relationship, what is the primary factor in deciding between embedding and referencing?
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
Refer to the exhibit. What is the most appropriate next step for an application encountering this error?
Select an answer to reveal the explanation
You are designing a schema for an e-commerce platform where products have a variable number of attributes like color, size, and material. Which modeling approach provides the best balance of flexibility and query performance for filtering products by these dynamic attributes?
Select an answer to reveal the explanation
What is the primary consequence of having too many indexes on a collection that experiences a high volume of write operations?
Select an answer to reveal the explanation
Which of the following describes the 'Extended Reference' pattern and its primary use case?
Select an answer to reveal the explanation
Which of the following best describes the purpose of the MongoDB 'mongosh' shell?
Select an answer to reveal the explanation
An e-commerce application models product reviews inside an array on the product document. As popular products accumulate hundreds of thousands of reviews, write operations and document fetch operations experience performance degradation. Which data modeling pattern best resolves this issue?
Select an answer to reveal the explanation
Refer to the exhibit. You have a collection where each document contains a 'tags' array. If you frequently query for documents containing specific tags, what is the best way to model and index this data?
Select an answer to reveal the explanation
Which operator is used to calculate the average value of a numeric field in a $group stage?
Select an answer to reveal the explanation
Which of the following describes the 'schema-flexible' nature of MongoDB?
Select an answer to reveal the explanation
Answer all 20 questions to see your domain score breakdown
A structured study plan dramatically increases your chances of passing C100DEV on the first attempt. The most effective approach combines reading the official MongoDB documentation or a study guide, watching video explanations for difficult concepts, and then reinforcing everything with daily practice questions.
We recommend the following weekly structure for C100DEV preparation:
Cover each C100DEV domain systematically. Read the exam objectives, watch explanatory content, and do 10–20 practice questions per domain to test understanding as you go.
Run full 50–60 question mixed sessions daily. Review every wrong answer in detail. Identify which domains are consistently scoring below 70% and revisit those study materials.
Do 100–120 question timed sessions to simulate real exam conditions. Aim for consistent scores above 80% before booking your exam date. A score above 80% in practice typically translates to a passing C100DEV score.
On exam day, the C100DEV tests your ability to apply knowledge to realistic scenarios — not just recall definitions. This is why reading explanations and understanding the reasoning behind every answer matters more than simply grinding question volume. Use the high-count sessions (100, 120) in the final weeks as your confidence benchmark.
Questions
~259
On the real exam
Time limit
90 min
Official time limit
Passing score
700/1000
Scaled scoring
The C100DEV exam uses a scaled scoring system — your raw score of correct answers is converted to a score out of 1000. A passing score of 700/1000 does not mean you need 70% of questions correct; the conversion accounts for question difficulty. Consistently scoring above 75–80% on practice tests puts you in a strong position to achieve 700/1000 on the real exam.
Scenario-based questions covering exam objectives with detailed answer explanations.
Yes. Courseiva provides free MongoDB Certified Associate Developer practice questions with explanations across the official exam domains. Start with a quick practice test, then continue with topic-based practice, mock exams, missed-question review, bookmarked questions, weak-topic recommendations, and readiness tracking. No account required. Create a free account to unlock per-domain analytics and progress tracking across every certification on the platform. Courseiva is free forever, supported by advertising.
Every question is written against the official C100DEV exam blueprint published by MongoDB. Our questions follow the same wording style, scenario complexity, and answer structure as the actual exam. They are original questions — not brain dumps — so you learn the underlying concepts and reasoning, not just memorised answers. Candidates who study with brain dumps often pass but have no transferable knowledge; Courseiva questions make you genuinely competent.
Most candidates who pass C100DEV on their first attempt do 30–60 questions per day. Use the Quick 10 session for daily warm-ups when you are short on time. On study days, run a 50 or 60-question session to build stamina. Reserve 100 and 120-question sessions for the final two weeks when you want to simulate real exam conditions and benchmark your readiness.
The C100DEV covers 6 domains: MongoDB Overview and Document Model, Drivers, Tools, Transactions, and Search, Aggregation Framework, Indexing, CRUD Operations, Data Modeling. Each domain carries a different weight, so allocate your study time accordingly. The highest-weighted domains — MongoDB Overview and Document Model and Drivers, Tools, Transactions, and Search — should receive the most attention.
Exam dumps are memorised question-and-answer lists taken from actual exam papers, often obtained illegally and shared without MongoDB's authorisation. Using them violates your NDA and MongoDB's certification agreement, and can result in certification revocation. Courseiva questions are original — AI-assisted, checked against the official exam objectives, and published under the editorial oversight of an engineer with 12+ years' experience. They test the same knowledge areas using new scenarios and wording. You learn the material, not just the answers.
Per-domain analytics, spaced repetition, daily challenges — and every other certification on the platform.
Sign Up FreeFree forever · Every certification included