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

Consider a MongoDB database managing e-commerce product data. The database has a collection named products with documents containing the fields product_id, category, price, and reviews. Each reviews field is an array of subdocuments with fields user_id, rating, and comment. You are tasked with optimizing a query that retrieves all products within a specific category that have an average rating higher than 4. The query is frequently used, and performance is critical. Which indexing strategy would best optimize this query?


Answer: A
Question 2

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 3

What is the correct syntax to insert multiple documents into a MongoDB collection named orders and return the _id values for all inserted documents?


Answer: B
Question 4

Where is the MongoDB configuration file usually located?


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