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. What is the purpose of mongoURI?

A) Specifies a connection string to MongoDB

B) Connects to replica sets

C) Exports database schemas

D) Restores a database

2 / 30

2. What is the main advantage of a TTL index in MongoDB?

A) Reduces query time

B) Improves write performance

C) Prevents duplicate records

D) Automatically deletes old documents

3 / 30

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

A) Locking entire collections

B) A single-threaded architecture

C) File-based locking

D) Document-level concurrency control

4 / 30

4. Which type of index is used to support text search in MongoDB?

A) Geospatial Index

B) Compound Index

C) Text Index

D) Full-text Index

5 / 30

5. What is MongoDB Atlas?

A) A command-line tool for MongoDB

B) A cloud-based database service

C) A backup tool

D) A GUI for managing databases

6 / 30

6. What is the purpose of secondary indexes?

A) To speed up specific queries

B) To manage sharding configurations

C) To improve write performance

D) To reduce document size

7 / 30

7. In which year was MongoDB developed?

A) 2013

B) 2010

C) 2007

D) 2005

8 / 30

8. Which of the following is true about tag-aware sharding?

A) It uses tags to group shards

B) It uses tags to back up data

C) It uses tags to compress data

D) It uses tags to encrypt data

9 / 30

9. What is the data type of the _id field by default?

A) String

B) Binary

C) ObjectId

D) Integer

10 / 30

10. Which command removes all documents from a collection?

A) db.collection.removeAll()

B) db.collection.deleteMany({})

C) db.collection.drop()

D) db.collection.delete()

11 / 30

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

A) They are optimized for time-series data

B) They store data in a compressed format

C) They are not supported in MongoDB

D) They are used for encrypting data

12 / 30

12. How do you stop the MongoDB server on Linux?

A) killall mongod

B) service mongod stop

C) Ctrl + C in the terminal

D) All of the above

13 / 30

13. How do you create a single field index in MongoDB?

A) db.collection.index({ field: 1 })

B) db.collection.addIndex({ field: 1 })

C) db.collection.addSingleIndex({ field: 1 })

D) db.collection.createIndex({ field: 1 })

14 / 30

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

A) To encrypt data

B) To back up data

C) To change a user's password

D) To create a new user

15 / 30

15. Which of the following is used to update a document in a collection?

A) db.collection.update()

B) db.collection.modify()

C) db.collection.findAndUpdate()

D) db.collection.save()

16 / 30

16. In MongoDB, which of the following is used for client-side interaction with the database?

A) mongodump

B) mongod

C) mongo shell

D) MongoDB Compass

17 / 30

17. Who were the founders of the company that developed MongoDB?

A) Larry Page and Sergey Brin

B) Dwight Merriman, Kevin P. Ryan, and Eliot Horowitz

C) Steve Jobs, Steve Wozniak, and Ronald Wayne

D) Bill Gates and Paul Allen

18 / 30

18. What is the purpose of roles in MongoDB?

A) To back up data

B) To compress data

C) To define user permissions

D) To encrypt data

19 / 30

19. Which tool is used to import data into MongoDB from JSON or CSV files?

A) mongoimport

B) mongotop

C) mongodump

D) mongoexport

20 / 30

20. What is the purpose of the db.grantRolesToUser() command?

A) To back up data

B) To encrypt data

C) To assign roles to an existing user

D) To create a new user

21 / 30

21. Which command provides statistics for a collection, including index usage?

A) db.collection.info()

B) db.collection.performance()

C) db.collection.stats()

D) db.collection.explain()

22 / 30

22. Which of the following is the best practice for queries that filter on multiple fields?

A) Use $regex filters

B) Use a compound index

C) Avoid using indexes

D) Use separate indexes for each field

23 / 30

23. Which of the following is true about MongoDB authentication mechanisms?

A) MongoDB does not support authentication

B) MongoDB supports only SCRAM-SHA-1

C) MongoDB supports only LDAP

D) MongoDB supports multiple authentication mechanisms

24 / 30

24. What is a key limitation of Many-to-Many relationships modeled with arrays?

A) Cannot use indexes

B) Data duplication

C) Array size limit

D) Harder to query

25 / 30

25. Which type of geospatial index does MongoDB support?

A) 3D index

B) Both A and C

C) 2D sphere index

D) 2D index

26 / 30

26. What is the purpose of Time-series Collections in MongoDB?

A) To compress data

B) To store and query time-series data efficiently

C) To back up data

D) To encrypt data

27 / 30

27. Which operator is used to query embedded documents in MongoDB?

A) $elemMatch

B) Dot notation

C) $nested

D) $lookup

28 / 30

28. What does { field: -1 } specify when creating an index?

A) Text index

B) Geospatial index

C) No index

D) Descending index

29 / 30

29. Which node in a replica set handles all write operations?

A) Arbiter node

B) Secondary node

C) Hidden node

D) Primary node

30 / 30

30. Which method retrieves only specific fields from documents?

A) db.collection.filter()

B) db.collection.select()

C) db.collection.projection()

D) db.collection.find({}, {field: 1})

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