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: Mar 20, 2026
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Question 1

Which of the following is the best practice for managing MongoDB data growth in a production environment (scale-out)?


Answer: C
Question 2

Given the following documents in a collection:
{ _id: 1, n: [1,2,5], p: 0.75, c: 'Green' },
{ _id: 2, n: 'Orange', p: 'Blue', c: 42, q: 14 },
{ _id: 3, n: [1,3,7], p: 0.85, c: 'Orange' }
Which two documents can successfully be added in the same collection? (Select two)


Answer: C,D
Question 3

Consider the following scenario: You have a MongoDB collection named users that stores user information. Each document in the collection has the following structure:
{
  "_id": ObjectId("609fe4b5728ad805aef1a88d"),
  "name": "John Doe",
  "age": 30,
  "email": "johndoe@example.com",
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "state": "NY",
    "zipcode": "10001"
  }
}
You need to retrieve all the documents from the users collection and convert them to an array format. Which of the following MongoDB queries should you use for this task?


Answer: B
Question 4

Consider a MongoDB collection named products which has documents in the following format:
{
    "_id" : ObjectId("5f5b0d2f3e3dfbcc11c84444"),
    "name" : "Smartphone",
    "brand" : "Apple",
    "category" : "Electronics",
    "price" : 1000,
    "discount" : 0.1
}
What is the correct syntax to update the "price" field of all documents in the products collection by multiplying it with (1 - discount) using the $set operator and the $multiply operator?


Answer: D
Question 5

Where is the MongoDB configuration file usually located?


Answer: B
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Total 411 Questions | Updated On: Mar 20, 2026
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