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 does the $match aggregation stage do?

A) Joins collections

B) Groups documents

C) Sorts documents

D) Filters documents

2 / 30

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

A) $match

B) $exists

C) $field

D) $include

3 / 30

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

A) CSV

B) JSON

C) XML

D) BSON

4 / 30

4. Which keyword in JSON schema specifies the data type of a field?

A) schema

B) format

C) type

D) validate

5 / 30

5. Which tool allows you to analyze MongoDB performance over time?

A) mongoexport

B) Ops Manager

C) mongos

D) mongotop

6 / 30

6. Which MongoDB function ensures unique field values across documents?

A) createIndex({field: 1}, {unique: true})

B) db.collection.setUnique()

C) db.collection.addConstraint()

D) $unique

7 / 30

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

A) Data duplication

B) Harder to query

C) Cannot use indexes

D) Array size limit

8 / 30

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

A) They are not supported in MongoDB

B) They are used for encrypting data

C) They store data in a compressed format

D) They are optimized for time-series data

9 / 30

9. Which of the following is true about GridFS?

A) It encrypts files

B) It stores files in two collections: fs.files and fs.chunks

C) It backs up files

D) It compresses files

10 / 30

10. Which command is used to enable auditing in MongoDB?

A) mongod --logAudit

B) mongod --enableAudit

C) mongod --auditDestination file

D) mongod --audit

11 / 30

11. What is the command to insert a document into a collection?

A) db.collection.update()

B) db.collection.insert()

C) db.collection.add()

D) db.collection.create()

12 / 30

12. Which MongoDB feature prevents large write operations from overwhelming the database?

A) Read preference

B) Capped collections

C) Query profiler

D) Write concern

13 / 30

13. Which command is used to access the MongoDB shell?

A) mongo-client

B) mongo shell

C) mongodb

D) mongosh

14 / 30

14. Which role provides full administrative access to a MongoDB database?

A) readWrite

B) root

C) dbAdmin

D) read

15 / 30

15. What is the role of the mongos process in MongoDB sharding?

A) To act as a config server

B) To store metadata

C) To store actual data

D) To route queries to the correct shard

16 / 30

16. How can sharding improve MongoDB performance?

A) By reducing index usage

B) By distributing data across multiple servers

C) By disabling replication

D) By increasing document size limits

17 / 30

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

A) db.collection.stats()

B) db.collection.explain()

C) db.collection.info()

D) db.collection.performance()

18 / 30

18. Which stage in the aggregation pipeline is used to join data from another collection?

A) $join

B) $merge

C) $lookup

D) $match

19 / 30

19. Which of the following platforms is supported by MongoDB?

A) macOS

B) Windows

C) Linux

D) All of the above

20 / 30

20. Which MongoDB tool provides a unified way to interact with JSON-like commands?

A) mongotop

B) mongosh

C) Ops Manager

D) MongoDB Compass

21 / 30

21. Which MongoDB tool provides a cloud backup and recovery solution?

A) MongoDB Atlas

B) mongostat

C) mongodump

D) Ops Manager

22 / 30

22. Which of the following is true about MongoDB encryption?

A) It only encrypts data at rest

B) It encrypts data at rest and in transit

C) It does not support encryption

D) It only encrypts data in transit

23 / 30

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

A) Graph

B) Relational

C) Document-oriented

D) Key-Value

24 / 30

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

A) Adds a field to the $match stage

B) None

C) Adds a new field to the document

D) Combines two fields into one

25 / 30

25. What does the $regex operator do?

A) Checks if a field exists

B) Matches values equal to a string

C) Matches values not in an array

D) Matches values based on a regular expression

26 / 30

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

A) In the same document

B) In a separate collection

C) In an array field

D) As an index

27 / 30

27. Which aggregation stage can be used to handle Many-to-Many relationships?

A) $project

B) $lookup

C) $group

D) $match

28 / 30

28. Which JSON schema keyword specifies the maximum number of items allowed in an array?

A) maxItems

B) maxArraySize

C) maximum

D) arrayLimit

29 / 30

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

A) Unlimited

B) 16MB

C) 32MB

D) 8MB

30 / 30

30. Which of the following is true about secondary nodes?

A) They are read-only

B) They handle all write operations

C) They do not participate in elections

D) They replicate data from the primary node

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