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Free MongoDB C100DEV Exam Questions

Absolute Free C100DEV Exam Practice for Comprehensive Preparation 

  • MongoDB C100DEV Exam Questions
  • Provided By: MongoDB
  • Exam: MongoDB Certified Developer Associate
  • Certification: MongoDB Certified Developer Associate
  • Total Questions: 411
  • Updated On: Apr 21, 2025
  • Rated: 4.9 |
  • Online Users: 822
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  • Question 1
    • In your database there is a collection named companies with the following document structure:
      {
        name: 'Wize',
        relationships: [
          {
            is_past: false,
            title: 'Head of Product',
            person: {
              first_name: 'Ethan',
              last_name: 'Smith',
              permalink: 'ethan-smith'
            }
          },
          {
            is_past: true,
            title: 'Director, Business Development',
            person: {
              first_name: 'Stephanie',
              last_name: 'Quay',
              permalink: 'stephanie-quay'
            }
          },
          {
            is_past: true,
            title: 'Sr. Engineer',
            person: {
              first_name: 'Stefan',
              last_name: 'Antonowicz',
              permalink: 'stefan-antonowicz'
            }
          }
        ]
      }
      Which of the following queries should you use to extract all companies that have "Co-Founder" title in relationships field (Array)?

      Answer: B
  • Question 2
    • How does MongoDB handle sorting on fields that contain missing values (i.e., values that are not present in all documents in the collection)?

      Answer: C
  • Question 3
    • Which of the following command skips the first 10 documents in the movies collection and returns all remaining documents?

      Answer: D
  • Question 4
    • 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 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
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