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 08, 2026
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Question 1

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


Answer: C
Question 2

Which of the following constraints might impact your data model for MongoDB? (Select three)


Answer: B,C,E
Question 3

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 4

As a MongoDB Developer, you are tasked with optimizing a MongoDB database. Your collection has documents with the following structure:
{
  "_id": ObjectId(),
  "user_id": Number,
  "user_data": {
    "name": String,
    "email": String,
    "phone": String,
    "address": {
      "city": String,
      "state": String,
      "country": String
    }
  },
  "transactions": [
    {
      "transaction_id": Number,
      "amount": Number,
      "date": Date
    }
  ]
}
The application frequently queries for the total transaction amount for users based on the city. Which index should you create to optimize the performance of these queries?


Answer: B
Question 5

In your database there is a collection named trips with the following document structure:
{
  '_id': ObjectId("572bb8222b288919b68abf6d"),
  'trip_duration': 858,
  'start_station id': 532,
  'end_station_id': 401,
  'bike_id': 17057,
  'start_station_loc': { type: 'Point', coordinates: [ -73.960876, 40.710451 ] },
  'end_station_loc': { type: 'Point', coordinates: [ -73.98997825, 40.72019576 ] },
  'start_time': ISODate("2016-01-01T00:09:31.000Z"),
  'stop_time': ISODate("2016-01-01T00:23:49.000Z")
}
How can you extract all trips from this collection ended at stations that are to the west of the -73.5 longitude coordinate?


Answer: C
Page:    1 / 83      
Total 411 Questions | Updated On: Mar 08, 2026
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