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 09, 2026
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Question 1

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 2

Suppose you have a restaurants collection with the following document structure:

{

  _id: ObjectId("5eb3d668b31de5d588f42931"),

  address: {

    building: '6409',

    coord: [ -74.00528899999999, 40.628886 ],

    street: '11 Avenue',

    zipcode: '11219'

  },

  borough: 'Brooklyn',

  cuisine: 'American',

  grades: [

    {

      date: ISODate("2014-07-18T00:00:00.000Z"),

      grade: 'A',

      score: 12

    },

    {

      date: ISODate("2013-07-30T00:00:00.000Z"),

      grade: 'A',

      score: 12

    },

    {

      date: ISODate("2013-02-13T00:00:00.000Z"),

      grade: 'A',

      score: 11

    },

    { date: ISODate("2012-08-16T00:00:00.000Z"), 

      grade: 'A', 

      score: 2 },

    {

      date: ISODate("2011-08-17T00:00:00.000Z"),

      grade: 'A',

      score: 11

    }

  ],

  name: 'Regina Caterers',

  restaurant_id: '40356649'

}

You don't have any indexes so far. What will the query plan look like for the following query?

db.restaurants.find( { "cuisine": "American" } )


Answer: D
Question 3

You are working on a MongoDB database for a library system. The system tracks book information in a Books collection. A typical document in this collection looks like this:
Original Document:
{
  "_id": ObjectId("book_id"),
  "title": "The Art of Computer Programming",
  "author": "Donald Knuth",
  "genres": ["Computer Science", "Algorithms"],
  "published_year": 1968,
  "copies_available": 3
}
You are asked to update the document by replacing it with the following document:
Updated Document:
{
  "title": "The Art of Computer Programming",
  "published_year": 1973
}
After this update, what will the final document in the database look like?


Answer: A
Question 4

We have the following indexes:
{ name: 1, founded_year: 1 }
{ tag_list: 1, is_active: 1 }
And the following documents:

{
    _id: ObjectId("52cdef7c4bab8bd675297daa"),
    name: "Sparter",
    founded_year: 2007,
    tag_list: ["gaming", "game", "wow"],
    is_active: true
},
{
    _id: ObjectId("52cdef7c4bab8bd675297da3"),
    name: "Yahoo!",
    founded_year: 1994,
    tag_list: ["search", "webmail"],
    is_active: true
}
Select the true statement.


Answer: B
Question 5

In MongoDB, which statement accurately describes a typical task for a MongoDB developer related to schema validation?


Answer: C
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Total 411 Questions | Updated On: Feb 09, 2026
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