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 19, 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

Suppose you have a reviews collection with the following index:
{ stars: 1, votes: 1 }
Which of the following queries would be a covered query?


Answer: D
Question 3

You are developing a MongoDB application where write performance is a critical requirement. Given a scenario where your application primarily performs insert operations and rarely performs updates or deletes, which of the following MongoDB features would best optimize this heavy-write workload?


Answer: D
Question 4

You are a MongoDB Associate Developer and need to demonstrate how to load the Atlas Sample Dataset into your MongoDB Atlas cluster. Your manager has asked you to guide a junior developer through this process to ensure they can independently load the dataset. What steps should the junior developer follow to successfully load the Atlas Sample Dataset?


Answer: A
Question 5

Consider a collection named students with the following document:
{
   "_id" : ObjectId("5f0a7e80d8c9c7b5a48c49e1"),
   "name" : "Alice",
   "age" : 21,
   "courses" : [
      {
         "name" : "Math",
         "grade" : 89
      },
      {
         "name" : "Science",
         "grade" : 92
      }
   ]
}
What is the query to update the grade of the "Math" course for the student with "_id" equal to ObjectId("5f0a7e80d8c9c7b5a48c49e1") to 95?


Answer: C
Page:    1 / 83      
Total 411 Questions | Updated On: Feb 19, 2026
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