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: Apr 02, 2026
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Question 1

Where is the MongoDB configuration file usually located?


Answer: B
Question 2

Consider the following documents in a MongoDB collection orders:
{
   "_id": 1,
   "customer_id": 101,
   "item": "apple",
   "price": 0.5,
   "quantity": 100,
   "date": ISODate("2022-01-01T00:00:00Z")
},
{
   "_id": 2,
   "customer_id": 102,
   "item": "banana",
   "price": 0.25,
   "quantity": 50,
   "date": ISODate("2022-01-02T00:00:00Z")
},
{
   "_id": 3,
   "customer_id": 101,
   "item": "orange",
   "price": 0.75,
   "quantity": 75,
   "date": ISODate("2022-01-03T00:00:00Z")
}
What is the aggregation pipeline to group the documents by "customer_id" and calculate the sum of the "quantity" field for each group, sorted in descending order by the sum of the "quantity" field?


Answer: D
Question 3

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
Question 4

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 5

Given a movies collection where each document has the following structure:

{
    _id: ObjectId('573a1390f29313caabcd60e4'),
    genres: [ 'Short', 'Comedy', 'Drama' ],
    title: 'The Immigrant',
    year: 1917,
    imdb: { rating: 7.8, votes: 4680, id: 8133 },
    countries: [ 'USA' ]
}
Which of the following queries will find all the movies that have more votes than the year in which they were released?


Answer: D
Page:    1 / 83      
Total 411 Questions | Updated On: Apr 02, 2026
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