MongoDB Quiz Test Online (30 random Questions) 2025

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 'working set' in MongoDB refer to?

A) The documents processed by a query

B) The data frequently accessed by the database

C) The set of active indexes

D) The memory allocated for aggregation

2 / 30

2. Which of the following is NOT a key advantage of MongoDB?

A) Horizontal scaling

B) Schema flexibility

C) Fixed schema

D) High availability

3 / 30

3. Which command analyzes replication performance in MongoDB?

A) db.replicaSet.stats()

B) db.printReplicationInfo()

C) mongotop

D) mongostat

4 / 30

4. Which command can be used to optimize One-to-Many queries involving references?

A) $facet

B) $lookup

C) $match

D) $sort

5 / 30

5. How are Many-to-Many relationships typically implemented in MongoDB?

A) Using $group

B) Using a junction (or bridge) collection

C) Using arrays of references

D) Using embedded documents

6 / 30

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

A) Query profiler

B) Read preference

C) Capped collections

D) Write concern

7 / 30

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

A) Data normalization

B) Reduced document size

C) Faster read performance

D) Increased flexibility

8 / 30

8. Which validation action in MongoDB allows documents that fail validation but logs a warning?

A) error

B) skip

C) ignore

D) warn

9 / 30

9. What is the purpose of mongoURI?

A) Specifies a connection string to MongoDB

B) Connects to replica sets

C) Restores a database

D) Exports database schemas

10 / 30

10. What is the purpose of the dbPath setting in mongod.conf?

A) To define the path for data storage

B) To set the default port

C) To specify the database username

D) To enable authentication

11 / 30

11. In MongoDB, what is used to represent a single record of data?

A) Row

B) Document

C) Table

D) Tuple

12 / 30

12. What is the smallest unit of data in MongoDB?

A) Collection

B) Document

C) Field

D) Database

13 / 30

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

A) db.collection.update()

B) db.collection.add()

C) db.collection.insert()

D) db.collection.create()

14 / 30

14. In a sharded MongoDB cluster, which component tracks the metadata of shard distribution?

A) Primary shard

B) Replication set

C) Config servers

D) Mongos router

15 / 30

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

A) fs.chunks.insert()

B) mongofiles

C) gridfs.insert()

D) fs.files.insert()

16 / 30

16. What is the purpose of the sh.splitAt() command?

A) To enable sharding

B) To split a chunk at a specific shard key value

C) To merge two chunks

D) To add a new shard

17 / 30

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

A) They are used for encrypting data

B) They automatically expire data after a certain period

C) They are not optimized for time-series data

D) They are used for compressing data

18 / 30

18. What does the $type operator check?

A) If a field exists

B) The data type of a field

C) The value of a field

D) The size of an array

19 / 30

19. What does the db.collection.getIndexes() command do?

A) Displays the query plan

B) Deletes all indexes

C) Creates a default index

D) Lists all indexes on the collection

20 / 30

20. What does the $unwind stage do in an aggregation pipeline?

A) Removes duplicate documents

B) Breaks an array field into multiple documents

C) Combines multiple fields into an array

D) Filters documents based on an array

21 / 30

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

A) Combines two fields into one

B) None

C) Adds a field to the $match stage

D) Adds a new field to the document

22 / 30

22. What is the default heartbeat interval for replica set members in MongoDB?

A) 2 seconds

B) 10 seconds

C) 1 second

D) 30 seconds

23 / 30

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

A) mongorestore

B) mongodump

C) mongoexport

D) mongoimport

24 / 30

24. How do indexes affect write performance in MongoDB?

A) They slow down write performance slightly.

B) They improve write performance.

C) They prevent write operations.

D) They have no impact on write performance.

25 / 30

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

A) They are not supported in MongoDB

B) They store data in a compressed format

C) They are optimized for time-series data

D) They are used for encrypting data

26 / 30

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

A) mongotop

B) Ops Manager

C) mongosh

D) MongoDB Compass

27 / 30

27. What is the default port for MongoDB?

A) 27017

B) 8080

C) 5432

D) 3306

28 / 30

28. Which command retrieves the total number of documents in a collection?

A) db.collection.numDocuments()

B) db.collection.count()

C) db.collection.total()

D) db.collection.size()

29 / 30

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

A) db.collection.update()

B) db.collection.delete()

C) db.collection.insert()

D) db.collection.find()

30 / 30

30. Which of the following commands deletes a collection?

A) db.collection.remove()

B) db.collection.drop()

C) db.removeCollection()

D) db.collection.delete()

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