MongoDB Quiz Test Online (30 random Questions) 2026

Test your MongoDB knowledge with this 30-minute quiz! Covering fundamental to advanced concepts, this quiz features 30 multiple-choice questions that will challenge your understanding of MongoDB, including data modeling, querying, indexing, and overall database management. Perfect for interview preparation and skill enhancement.

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30 Minutes MongoDB Quiz Test Online

Test your MongoDB knowledge with this 30-minute quiz! Covering fundamental to advanced concepts, this quiz features 30 multiple-choice questions that will challenge your understanding of MongoDB, including data modeling, querying, indexing, and overall database management. Perfect for interview preparation and skill enhancement.

1 / 30

1. Which aggregation stage is used to filter documents based on specified conditions?

A) $sort

B) $project

C) $group

D) $match

2 / 30

2. How can you ensure MongoDB starts automatically after a system reboot?

A) Use systemctl enable mongod on Linux

B) Add mongod to startup scripts

C) All of the above

D) Enable MongoDB as a system service

3 / 30

3. What is the default port for MongoDB?

A) 5432

B) 3306

C) 27017

D) 8080

4 / 30

4. Which stage is used to sort documents in an aggregation pipeline?

A) $group

B) $sort

C) $match

D) $project

5 / 30

5. Which data type is used to store an array of values in MongoDB?

A) List

B) Array

C) Collection

D) Set

6 / 30

6. Which MongoDB method skips a specific number of documents in query results?

A) db.collection.limit().skip(n)

B) db.collection.skip()

C) db.collection.find().skip(n)

D) db.collection.query.skip(n)

7 / 30

7. Which of the following is true about a shard in MongoDB?

A) It is a replica set or a standalone server

B) It is a single MongoDB instance

C) It is a configuration server

D) It is a query router

8 / 30

8. Which of the following command enables authentication in MongoDB?

A) mongod --enableAuth

B) mongo --enableAuth

C) mongo --auth

D) mongod --auth

9 / 30

9. What does the wiredTiger storage engine use to optimize performance?

A) Locking entire collections

B) File-based locking

C) A single-threaded architecture

D) Document-level concurrency control

10 / 30

10. Which of the following is true about Time-series Collections?

A) They are used for compressing data

B) They are not optimized for time-series data

C) They are used for encrypting data

D) They support efficient queries on time-based data

11 / 30

11. Which operator checks if a field exists in a document?

A) $exists

B) $field

C) $match

D) $include

12 / 30

12. What type of database is MongoDB considered?

A) NoSQL Database

B) Graph Database

C) Relational Database

D) In-Memory Database

13 / 30

13. Which index type is created by default for every MongoDB collection?

A) Single-field index on _id

B) Geospatial index

C) Compound index

D) Text index

14 / 30

14. What is the purpose of the db.changeUserPassword() command?

A) To create a new user

B) To change a user's password

C) To encrypt data

D) To back up data

15 / 30

15. What is the role of balancer in MongoDB sharding?

A) Compresses large documents

B) Distributes queries among shards

C) Deletes unused indexes

D) Moves data between shards

16 / 30

16. Which command is used to insert a file into GridFS?

A) fs.files.insert()

B) fs.chunks.insert()

C) mongofiles

D) gridfs.insert()

17 / 30

17. What is the purpose of the oplog in MongoDB?

A) To track replication

B) To monitor server logs

C) To manage indexes

D) To store schema validation rules

18 / 30

18. What is the default identifier for every MongoDB document?

A) _index

B) _name

C) _id

D) _key

19 / 30

19. In a normalized data model, where are related data stored?

A) In a separate collection

B) As an index

C) In an array field

D) In the same document

20 / 30

20. Which command analyzes replication performance in MongoDB?

A) db.printReplicationInfo()

B) mongostat

C) mongotop

D) db.replicaSet.stats()

21 / 30

21. What is the function of the $or operator in MongoDB?

A) Matches documents that satisfy one or more conditions

B) Matches documents where no condition is true

C) Matches documents with equality

D) Matches documents with all conditions being true

22 / 30

22. Which of the following is true about Change Streams?

A) They can monitor changes to an entire database

B) They can monitor changes to a replica set

C) All of the above

D) They can monitor changes to a single collection

23 / 30

23. Which command is used to create a Change Stream in MongoDB?

A) db.collection.watch()

B) db.collection.listen()

C) db.collection.monitor()

D) db.collection.stream()

24 / 30

24. Which stage limits the number of documents in an aggregation pipeline?

A) $limit

B) $match

C) $skip

D) $lm

25 / 30

25. Which of the following MongoDB operations is used to update an existing document?

A) db.collection.delete()

B) db.collection.update()

C) db.collection.find()

D) db.collection.insert()

26 / 30

26. What is sharding in MongoDB?

A) A method for backing up data

B) A method for encrypting data

C) A method for compressing data

D) A method for distributing data across multiple servers

27 / 30

27. How do you limit the number of documents returned in a query?

A) db.collection.find().limit(n)

B) db.collection.resultLimit(n)

C) db.collection.query.limit(n)

D) db.collection.limit(n)

28 / 30

28. What is GridFS in MongoDB?

A) A feature for encrypting data

B) A feature for storing and retrieving large files

C) A feature for backing up data

D) A feature for compressing data

29 / 30

29. Which aggregation stage is used to combine multiple documents into a single output document with cumulative calculations?

A) $project

B) $group

C) $sort

D) $match

30 / 30

30. What is an advantage of using embedded documents over references?

A) Faster read performance

B) Increased flexibility

C) Data normalization

D) Reduced document size

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