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 19, 2026
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Question 1

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
Question 2

You have a MongoDB collection named students, where each document represents a student. The documents include fields like name, age, and courses. The courses field is an array that lists the course codes each student is enrolled in. You want to find all students enrolled in the course with the code "CS101". Which query will correctly retrieve all students enrolled in "CS101"?


Answer: D
Question 3

In the context of MongoDB development, you are creating a new service that is expected to handle high load. You've decided to leverage the MongoDB drivers' connection pooling capability. What best describes connection pooling and its advantages?


Answer: C
Question 4

In MongoDB, which statement accurately describes a typical task for a MongoDB developer related to schema validation?


Answer: C
Question 5

Suppose you have a restaurants collection with the following document structure:

{

  _id: ObjectId("5eb3d668b31de5d588f42931"),

  address: {

    building: '6409',

    coord: [ -74.00528899999999, 40.628886 ],

    street: '11 Avenue',

    zipcode: '11219'

  },

  borough: 'Brooklyn',

  cuisine: 'American',

  grades: [

    {

      date: ISODate("2014-07-18T00:00:00.000Z"),

      grade: 'A',

      score: 12

    },

    {

      date: ISODate("2013-07-30T00:00:00.000Z"),

      grade: 'A',

      score: 12

    },

    {

      date: ISODate("2013-02-13T00:00:00.000Z"),

      grade: 'A',

      score: 11

    },

    { date: ISODate("2012-08-16T00:00:00.000Z"), 

      grade: 'A', 

      score: 2 },

    {

      date: ISODate("2011-08-17T00:00:00.000Z"),

      grade: 'A',

      score: 11

    }

  ],

  name: 'Regina Caterers',

  restaurant_id: '40356649'

}

You don't have any indexes so far. What will the query plan look like for the following query?

db.restaurants.find( { "cuisine": "American" } )


Answer: D
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Total 411 Questions | Updated On: Mar 19, 2026
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