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 roles in MongoDB?

A) To encrypt data

B) To compress data

C) To back up data

D) To define user permissions

2 / 30

2. How do you create a unique index in MongoDB?

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

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

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

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

3 / 30

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

A) Matches documents with equality

B) Matches documents that satisfy one or more conditions

C) Matches documents with all conditions being true

D) Matches documents where no condition is true

4 / 30

4. Which command is used to check the installed version of MongoDB?

A) mongod --list

B) mongodb -v

C) mongo --version

D) mongo -v

5 / 30

5. Which $lookup parameter defines the collection to join?

A) foreignField

B) as

C) from

D) localField

6 / 30

6. What does the mongostat command display?

A) Query performance statistics

B) Backup logs

C) Read/write metrics in real-time

D) Memory usage

7 / 30

7. Which of the following significantly improves query performance?

A) Creating indexes

B) Using large arrays

C) Avoiding queries with $or

D) Disabling validation

8 / 30

8. Which MongoDB component is responsible for routing queries in a sharded cluster?

A) mongos

B) mongotop

C) mongod

D) mongostat

9 / 30

9. MongoDB is an example of which type of database?

A) Document-oriented

B) Key-Value

C) Relational

D) Graph

10 / 30

10. Which method fetches related documents using manual references?

A) db.collection.join(referenceId)

B) $lookup

C) db.collection.find({ _id: referenceId })

D) $merge

11 / 30

11. Which of the following is the correct command to create a new MongoDB database?

A) createDatabase()

B) createDB()

C) use database_name

D) db.create()

12 / 30

12. What is the purpose of relationships in MongoDB?

A) To store data in a single collection

B) To establish connections between data in different collections

C) To index fields automatically

D) To enforce strict schemas

13 / 30

13. What is the default size limit for a single MongoDB document?

A) Unlimited

B) 8MB

C) 32MB

D) 16MB

14 / 30

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

A) mongoimport

B) mongotop

C) mongoexport

D) mongodump

15 / 30

15. What does the $addFields stage do in MongoDB?

A) Adds a new field to the document

B) Adds a field to the $match stage

C) Combines two fields into one

D) None

16 / 30

16. What type of MongoDB node can serve read requests in a replica set?

A) Secondary node only

B) Both primary and secondary nodes

C) Arbiter node

D) Primary node only

17 / 30

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

A) Locking entire collections

B) Document-level concurrency control

C) File-based locking

D) A single-threaded architecture

18 / 30

18. How do you query all documents from a collection?

A) db.collection.findAll()

B) db.collection.getAll()

C) db.collection.find()

D) db.collection.query()

19 / 30

19. What is the format used by MongoDB to store data?

A) BSON

B) CSV

C) JSON

D) XML

20 / 30

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

A) Use a compound index

B) Use separate indexes for each field

C) Avoid using indexes

D) Use $regex filters

21 / 30

21. Which of the following is true about MongoDB Transactions?

A) They are not supported in MongoDB

B) They are used for compressing data

C) They require a replica set or sharded cluster

D) They are supported only in standalone MongoDB instances

22 / 30

22. What is a potential drawback of using $lookup?

A) Increased query execution time

B) Reduced query flexibility

C) Limited support for text fields

D) Requires schema enforcement

23 / 30

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

A) Array size limit

B) Cannot use indexes

C) Data duplication

D) Harder to query

24 / 30

24. Which of the following is true about the votes property in a replica set?

A) It determines the storage capacity of a node

B) It determines the read preference of a node

C) It determines whether a node can vote in elections

D) It determines the write concern of a node

25 / 30

25. How does journaling help in MongoDB?

A) Reduces disk usage

B) Increases indexing speed

C) Improves write performance

D) Provides crash recovery

26 / 30

26. In which year was MongoDB developed?

A) 2010

B) 2005

C) 2013

D) 2007

27 / 30

27. What is the default authentication mechanism in MongoDB?

A) X.509

B) LDAP

C) SCRAM-SHA-1

D) Kerberos

28 / 30

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

A) $group

B) $project

C) $sort

D) $match

29 / 30

29. What is the default format for backups created by mongodump?

A) BSON

B) Plain Text

C) CSV

D) JSON

30 / 30

30. What is the primary purpose of data validation in MongoDB?

A) To enforce relationships between documents

B) To manage indexes

C) To ensure that inserted or updated documents meet specific criteria

D) To improve query performance

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