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: Mar 12, 2026
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Question 1

Where is the MongoDB configuration file usually located?


Answer: B
Question 2

You manage a MongoDB collection called inventory that stores documents for a store's inventory. Each document has the fields item, category, and quantity. You want to ensure that an item is always present in the collection, even if it needs to be inserted. Specifically, if the item "notebook" in the "Stationery" category does not exist, it should be inserted with a quantity of 50. If it does exist, its quantity should be updated to 50. You plan to use the following command:
db.inventory.updateOne(
  { "item": "notebook", "category": "Stationery" },
  { $set: { "quantity": 50 } },
  { upsert: true }
)
What will happen after executing this command if there is no "notebook" item in the "Stationery" category in the inventory collection?


Answer: D
Question 3

How can we present the basic syntax for aggregation in MongoDB?


Answer: D
Question 4

In MongoDB, the $out operator is commonly used within an aggregation pipeline. Which of the following statements accurately describes the functionality and usage of the $out operator?


Answer: A
Question 5

Consider a collection named orders with the following documents:
{
   "_id" : ObjectId("5f0a7e80d8c9c7b5a48c49e1"),
   "order_id" : 101,
   "customer_name" : "John Doe",
   "order_date" : ISODate("2022-01-01T00:00:00.000Z"),
   "items" : [
      {
         "product_name" : "Apple",
         "quantity" : 2,
         "price" : 0.99
      },
      {
         "product_name" : "Banana",
         "quantity" : 5,
         "price" : 0.5
      }
   ]
}
 
{
   "_id" : ObjectId("5f0a7e80d8c9c7b5a48c49e2"),
   "order_id" : 102,
   "customer_name" : "Jane Doe",
   "order_date" : ISODate("2022-01-02T00:00:00.000Z"),
   "items" : [
      {
         "product_name" : "Orange",
         "quantity" : 3,
         "price" : 0.79
      },
      {
         "product_name" : "Mango",
         "quantity" : 2,
         "price" : 1.99
      }
   ]
}
 
{
   "_id" : ObjectId("5f0a7e80d8c9c7b5a48c49e3"),
   "order_id" : 103,
   "customer_name" : "Bob Smith",
   "order_date" : ISODate("2022-01-03T00:00:00.000Z"),
   "items" : [
      {
         "product_name" : "Peach",
         "quantity" : 4,
         "price" : 1.49
      },
      {
         "product_name" : "Pear",
         "quantity" : 1,
         "price" : 2.99
      }
   ]
}
What is the query to retrieve the total sales for each customer in the orders collection?


Answer: B
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Total 411 Questions | Updated On: Mar 12, 2026
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