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

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 2

Which of the following statements correctly describes the relationship between BSON and JSON in MongoDB?


Answer: C
Question 3

What command can you use to create a capped collection named latest_news that will be limited to 3 documents and 10,000 bytes?


Answer: B
Question 4

Consider a collection named orders with the following documents:
{
   "_id" : ObjectId("5f0a7e80d8c9c7b5a48c49e1"),
   "order_number" : 1001,
   "customer_id" : "CUST-001",
   "order_date" : ISODate("2022-01-01T00:00:00Z"),
   "total_amount" : 199.99
},
{
   "_id" : ObjectId("5f0a7e80d8c9c7b5a48c49e2"),
   "order_number" : 1002,
   "customer_id" : "CUST-002",
   "order_date" : ISODate("2022-02-01T00:00:00Z"),
   "total_amount" : 299.99
},
{
   "_id" : ObjectId("5f0a7e80d8c9c7b5a48c49e3"),
   "order_number" : 1003,
   "customer_id" : "CUST-003",
   "order_date" : ISODate("2022-03-01T00:00:00Z"),
   "total_amount" : 399.99
}
What is the query to create a compound index on the "customer_id" (ascending) and "order_date" (descending) fields in the orders collection?


Answer: C
Question 5

Consider a tasks collection that holds task records. The document structure is as follows:
{
  "_id": ObjectId("64b64c58ed01c0a5e72dbf5f"),
  "task": "Review PR",
  "status": "pending",
  "assignedTo": "alice"
}
Two operations are performed concurrently:
Operation A:

db.tasks.findAndModify({
    query: { task: "Review PR", status: "pending" },
    remove: true
});
Operation B:
db.tasks.findAndModify({
    query: { task: "Review PR", status: "pending" },
    update: { $set: { status: "completed" } },
    new: true
});
Operation B starts slightly after Operation A but before Operation A completes. What will be the final state of the tasks collection after both operations have been executed?


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