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 command is used to create a user in MongoDB?

A) db.insertUser()

B) db.newUser()

C) db.addUser()

D) db.createUser()

2 / 30

2. How do you specify the output field for a $lookup operation?

A) as

B) outputField

C) alias

D) result

3 / 30

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

A) $match

B) $exists

C) $field

D) $include

4 / 30

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

A) They are not supported in MongoDB

B) They are supported only in standalone MongoDB instances

C) They are used for compressing data

D) They require a replica set or sharded cluster

5 / 30

5. What is the default installation directory for MongoDB on Windows?

A) C:NoSQLMongoDB

B) C:MongoDBbin

C) C:Program FilesNoSQLMongoDB

D) C:Program FilesMongoDB

6 / 30

6. Which tool restores data from a backup created by mongodump?

A) mongotop

B) mongos

C) mongoimport

D) mongorestore

7 / 30

7. What is the purpose of the fs.files collection in GridFS?

A) To store the actual file data

B) To store metadata about files

C) To compress files

D) To encrypt files

8 / 30

8. What is the role of balancer in MongoDB sharding?

A) Compresses large documents

B) Deletes unused indexes

C) Distributes queries among shards

D) Moves data between shards

9 / 30

9. What is a replica set in MongoDB?

A) A backup of the database

B) A group of MongoDB instances that maintain the same data set

C) A sharded cluster

D) A single MongoDB instance

10 / 30

10. Which method retrieves only specific fields from documents?

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

B) db.collection.select()

C) db.collection.projection()

D) db.collection.filter()

11 / 30

11. Which of the following is true about the additionalProperties keyword in a JSON schema?

A) It allows the inclusion of extra fields

B) It defines default values for fields

C) It allows only predefined fields in a document

D) It validates array elements

12 / 30

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

A) $lookup

B) $match

C) $group

D) $project

13 / 30

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

A) To enable sharding

B) To add a new shard

C) To merge two chunks

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

14 / 30

14. In which year was MongoDB developed?

A) 2013

B) 2005

C) 2010

D) 2007

15 / 30

15. What is the purpose of the balancer in MongoDB sharding?

A) To distribute chunks evenly across shards

B) To back up data

C) To encrypt data

D) To route queries to shards

16 / 30

16. Which of the following is true about the sh.enableBalancing() command?

A) It adds a new shard

B) It removes a shard

C) It enables the balancer to redistribute chunks

D) It stops the balancer

17 / 30

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

A) They are atomic at the multi-document level

B) They are atomic at the single-document level

C) They are not atomic

D) They are used for compressing data

18 / 30

18. What is a shard key in MongoDB?

A) A password for accessing shards

B) A field used to partition data across shards

C) A unique identifier for each document

D) A configuration file for sharding

19 / 30

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

A) $ag

B) $groupAvg

C) $average

D) $avg

20 / 30

20. Which feature does MongoDB offer to ensure data redundancy and high availability?

A) Sharding

B) Column indexing

C) Full-text search

D) Replica sets

21 / 30

21. What does the $type operator check?

A) If a field exists

B) The value of a field

C) The size of an array

D) The data type of a field

22 / 30

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

A) All of the above

B) Ctrl + C in the terminal

C) killall mongod

D) service mongod stop

23 / 30

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

A) A single-threaded architecture

B) Document-level concurrency control

C) File-based locking

D) Locking entire collections

24 / 30

24. Which operator in the $group stage is used to count the total number of documents in a group?

A) $total

B) $count

C) $docs

D) $sum: 1

25 / 30

25. What is a hidden node in a replica set?

A) A node that handles only write operations

B) A node that is not visible to the application

C) A node that does not participate in replication

D) A node that stores encrypted data

26 / 30

26. Which of the following is true about the shardCollection command?

A) It adds a new shard

B) It shards a specific collection

C) It removes a shard

D) It enables sharding for a database

27 / 30

27. What is the primary purpose of the $project stage in MongoDB?

A) Groups documents by a specified field

B) Filters documents

C) Sorts documents

D) Includes or excludes fields in the output

28 / 30

28. Which of the following commands creates a new database in MongoDB?

A) db.createDatabase()

B) createDatabase()

C) db.create()

D) use database_name

29 / 30

29. What is the purpose of the fs.chunks collection in GridFS?

A) To compress files

B) To encrypt files

C) To store metadata about files

D) To store the actual file data

30 / 30

30. Which of the following is a MongoDB security feature?

A) Replication

B) Indexing

C) Authentication

D) Sharding

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