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 of the following operators is used to match multiple values in MongoDB?

A) $or

B) $in

C) $and

D) $match

2 / 30

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

A) It uses tags to group shards

B) It uses tags to encrypt data

C) It uses tags to compress data

D) It uses tags to back up data

3 / 30

3. Which type of geospatial index does MongoDB support?

A) 3D index

B) 2D index

C) 2D sphere index

D) Both A and C

4 / 30

4. What is the purpose of the $set operator in MongoDB?

A) To replace a document

B) To remove fields from a document

C) To create a collection

D) To update specific fields

5 / 30

5. Which command is used to initiate a replica set in MongoDB?

A) rs.enable()

B) rs.initiate()

C) rs.create()

D) rs.start()

6 / 30

6. How can sharding improve MongoDB performance?

A) By distributing data across multiple servers

B) By reducing index usage

C) By disabling replication

D) By increasing document size limits

7 / 30

7. On which port does MongoDB listen by default?

A) 27017

B) 3306

C) 8080

D) 5432

8 / 30

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

A) They are only supported in single-document operations

B) They provide multi-document ACID compliance

C) They are used for compressing data

D) They are not supported in MongoDB

9 / 30

9. Which storage option ensures faster reads for frequently accessed data?

A) Distributed storage

B) In-memory storage

C) Compressed storage

D) Disk-based storage

10 / 30

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

A) db.collection.watch()

B) db.collection.monitor()

C) db.collection.stream()

D) db.collection.listen()

11 / 30

11. Which of the following is true about a compound index?

A) Compound indexes are automatically created on all fields.

B) The order of fields in a compound index does not matter.

C) The order of fields in a compound index matters.

D) Compound indexes cannot include more than two fields.

12 / 30

12. How does journaling help in MongoDB?

A) Increases indexing speed

B) Improves write performance

C) Provides crash recovery

D) Reduces disk usage

13 / 30

13. Which command is used to check the status of a replica set?

A) rs.info()

B) rs.health()

C) rs.check()

D) rs.status()

14 / 30

14. Which of the following is not a valid MongoDB data type?

A) Boolean

B) Integer

C) Float

D) Array

15 / 30

15. What is a collection in MongoDB?

A) A group of fields

B) A group of documents

C) A group of tables

D) A group of databases

16 / 30

16. What is the recommended way to avoid performance issues with $or queries?

A) Always use aggregation pipelines

B) Optimize indexes for each condition

C) Use $and instead of $or

D) Avoid combining conditions

17 / 30

17. Which command is used to retrieve a file from GridFS?

A) gridfs.retrieve()

B) fs.chunks.retrieve()

C) mongofiles

D) fs.files.retrieve()

18 / 30

18. What is the role of a delayed secondary node?

A) To speed up replication

B) To delay replication for disaster recovery purposes

C) To handle write operations

D) To act as an arbiter

19 / 30

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

A) Adds a field to the $match stage

B) Adds a new field to the document

C) Combines two fields into one

D) None

20 / 30

20. What is the purpose of the mongoURI connection string?

A) To restore data

B) To create indexes

C) To backup databases

D) To connect applications to MongoDB instances

21 / 30

21. What is the purpose of the $unset operator?

A) To delete a document

B) To replace a collection

C) To add new fields

D) To remove fields from a document

22 / 30

22. What is the purpose of the db.currentOp() command?

A) To list all collections

B) To create indexes

C) To display active queries and operations

D) To optimize query execution

23 / 30

23. What is a shard key in MongoDB?

A) A configuration file for sharding

B) A unique identifier for each document

C) A password for accessing shards

D) A field used to partition data across shards

24 / 30

24. What is the default priority of a secondary node in a replica set?

A) 10

B) 2

C) 1

D) 0

25 / 30

25. In which situation is embedding a poor choice for modeling relationships?

A) When related data grows without limits

B) When related data rarely changes

C) When there is a One-to-One relationship

D) When queries require frequent joins

26 / 30

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

A) A single-threaded architecture

B) File-based locking

C) Locking entire collections

D) Document-level concurrency control

27 / 30

27. Which operator is used to match documents where a field's value is greater than a specified value?

A) $gte

B) $lte

C) $gt

D) $lt

28 / 30

28. What does the $regex operator do?

A) Matches values equal to a string

B) Matches values not in an array

C) Checks if a field exists

D) Matches values based on a regular expression

29 / 30

29. Which operator is used to calculate the average value in a $group stage?

A) $groupAvg

B) $avg

C) $ag

D) $average

30 / 30

30. Which MongoDB operator negates the condition?

A) $nin

B) $not

C) $ne

D) $nor

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