Free MongoDB C100DEV Exam Questions

Become MongoDB Certified with updated C100DEV exam questions and correct answers

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Total 411 Questions | Updated On: Feb 19, 2026
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Question 1

How does MongoDB handle sorting on fields that contain missing values (i.e., values that are not present in all documents in the collection)?


Answer: C
Question 2

You are designing a MongoDB collection to store information about books in a library. Each book document should contain the following fields:title: The title of the book (string).authors: An array of author names (array of strings).published_date: The publication date of the book (ISODate).categories: An array of categories or genres the book belongs to (array of strings).copies: An array containing details about each copy of the book, where each copy has an availability_status (string), location (string), and borrowed_date (ISODate) if the book is currently borrowed.Given this requirement, which of the following schemas correctly represents the document model for this use case? (Select two)


Answer: A,E
Question 3

Suppose you have a products collection with an index:
{ product_category: 1 }
For which of the following queries can MongoDB look at only a subset of the index entries, rather than all of the index entries?


Answer: D
Question 4

You are a MongoDB Associate Developer and need to demonstrate how to load the Atlas Sample Dataset into your MongoDB Atlas cluster. Your manager has asked you to guide a junior developer through this process to ensure they can independently load the dataset. What steps should the junior developer follow to successfully load the Atlas Sample Dataset?


Answer: A
Question 5

We have an accounts collection with the following document structure:
{
  _id: ObjectId("5ca4bbc7a2dd94ee5816239d"),
  account_id: 864905,
  limit: 10000,
  products: [ 'Commodity', 'InvestmentStock' ]
},
{
  _id: ObjectId("5ca4bbc7a2dd94ee5816239e"),
  account_id: 299072,
  limit: 10000,
  products: [ 'InvestmentFund', 'InvestmentStock' ]
},
{
  _id: ObjectId("5ca4bbc7a2dd94ee5816239f"),
  account_id: 137994,
  limit: 10000,
  products: [ 'CurrencyService', 'InvestmentStock' ]
}
We need to use Aggregation Framework to find the distribution of products field. Sort the result set by decreasing total number of products.
Expected output:
[
    { _id: 'InvestmentStock', total: 1746 },
    { _id: 'CurrencyService', total: 742 },
    { _id: 'Brokerage', total: 741 },
    { _id: 'InvestmentFund', total: 728 },
    { _id: 'Commodity', total: 720 },
    { _id: 'Derivatives', total: 706 }
]
Which pipeline should you use?


Answer: B
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Total 411 Questions | Updated On: Feb 19, 2026
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