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

You have a MongoDB collection named employees that contains documents with fields name, department, and salary. You want to update the salary of all employees in the "Marketing" department to $75,000. The original collection looks like this:
[
  { "_id": 1, "name": "Alice", "department": "Marketing", "salary": 60000 },
  { "_id": 2, "name": "Bob", "department": "Sales", "salary": 55000 },
  { "_id": 3, "name": "Charlie", "department": "Marketing", "salary": 62000 },
  { "_id": 4, "name": "David", "department": "Engineering", "salary": 70000 }
]
You run the following MongoDB update operation:
db.employees.updateMany(
  { "department": "Marketing" },
  { $set: { "salary": 75000 } }
)
What will the collection look like after this update operation?


Answer: C
Question 2

Which of the following constraints might impact your data model for MongoDB? (Select three)


Answer: B,C,E
Question 3

Consider a MongoDB collection named products which has documents in the following format:
{
    "_id" : ObjectId("5f5b0d2f3e3dfbcc11c84444"),
    "name" : "Smartphone",
    "brand" : "Apple",
    "category" : "Electronics",
    "price" : 1000,
    "discount" : 0.1
}
What is the correct syntax to update the "price" field of all documents in the products collection by multiplying it with (1 - discount) using the $set operator and the $multiply operator?


Answer: D
Question 4

Which of the following command skips the first 10 documents in the movies collection and returns all remaining documents?


Answer: D
Question 5

Given a movies collection where each document has the following structure:

{
    _id: ObjectId('573a1390f29313caabcd60e4'),
    genres: [ 'Short', 'Comedy', 'Drama' ],
    title: 'The Immigrant',
    year: 1917,
    imdb: { rating: 7.8, votes: 4680, id: 8133 },
    countries: [ 'USA' ]
}
Which of the following queries will find all the movies that have more votes than the year in which they were released?


Answer: D
Page:    1 / 83      
Total 411 Questions | Updated On: Mar 19, 2026
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