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 27, 2026
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Question 1

Suppose you insert the following documents into a companies collection:
db.companies.insertMany([
    {"name": "Facebook"}, 
    {"name": "X"}
])
Select all true statements about this command. (Select three)


Answer: C,D,E
Question 2

Consider the following situation: You are a MongoDB Developer and are currently working on an application that requires complex reporting on large amounts of data. The application stores its data in MongoDB, which has grown significantly. To maintain efficiency and manageability, you decide to use MongoDB views. You want to create a view "UsersView" that includes only username, email, and createdAt fields from the Users collection. Which of the following commands would you use?


Answer: A
Question 3

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 4

You are developing a blogging platform using MongoDB as the database. Each blog post document has a tags array field that holds a list of strings. You are tasked to implement a search functionality that allows users to find blog posts based on the tags. Which of the following MongoDB features would you utilize to implement this functionality efficiently?


Answer: C
Question 5

You are tasked with developing a high-performance application using MongoDB as your primary database. The application heavily relies on queries that retrieve user profiles based on user names and their location. Given this requirement, you decide to implement a strategy to make these queries more efficient. What strategy should you implement to ensure these queries are covered queries?


Answer: D
Page:    1 / 83      
Total 411 Questions | Updated On: Apr 27, 2026
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