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 the $set operator in MongoDB?

A) To update specific fields

B) To create a collection

C) To replace a document

D) To remove fields from a document

2 / 30

2. How can you ensure MongoDB starts automatically after a system reboot?

A) Enable MongoDB as a system service

B) Add mongod to startup scripts

C) Use systemctl enable mongod on Linux

D) All of the above

3 / 30

3. Which tool is used to manage sharded clusters in MongoDB?

A) mongostat

B) mongos

C) mongoexport

D) mongotop

4 / 30

4. How do you exclude a field in a query result using projection?

A) { field: 0 }

B) { field: -1 }

C) { field: false }

D) { field: 1 }

5 / 30

5. Which of the following commands is used to drop a database in MongoDB?

A) db.deleteDatabase()

B) db.dropDatabase()

C) db.drop()

D) dropDatabase()

6 / 30

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

A) They are optimized for time-series data

B) They are not supported in MongoDB

C) They store data in a compressed format

D) They are used for encrypting data

7 / 30

7. How can you remove validation rules from a collection?

A) db.collection.dropValidation()

B) Modify the schema to default

C) db.collection.removeValidation()

D) Use collMod with an empty validation object

8 / 30

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

A) To compress files

B) To encrypt files

C) To store the actual file data

D) To store metadata about files

9 / 30

9. Which of the following is true about MongoDB encryption at rest?

A) It uses SSL/TLS encryption

B) It uses RSA encryption

C) It uses AES-256 encryption

D) It does not support encryption at rest

10 / 30

10. How can you check the structure of a collection's documents?

A) db.collection.findOne()

B) db.collection.show()

C) db.collection.explain()

D) db.collection.structure()

11 / 30

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

A) To manage indexes

B) To improve query performance

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

D) To enforce relationships between documents

12 / 30

12. Which method retrieves only specific fields from documents?

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

B) db.collection.projection()

C) db.collection.filter()

D) db.collection.select()

13 / 30

13. Which feature of MongoDB is responsible for distributing data across multiple servers?

A) Indexing

B) Transactions

C) Aggregation

D) Sharding

14 / 30

14. Which stage is used to skip a specified number of documents in the pipeline?

A) $match

B) $jump

C) $limit

D) $skip

15 / 30

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

A) $lookup

B) $join

C) $match

D) $merge

16 / 30

16. Which of the following is used to update a document in a collection?

A) db.collection.update()

B) db.collection.findAndUpdate()

C) db.collection.save()

D) db.collection.modify()

17 / 30

17. Which command analyzes replication performance in MongoDB?

A) mongostat

B) db.replicaSet.stats()

C) mongotop

D) db.printReplicationInfo()

18 / 30

18. What is the primary purpose of replication in MongoDB?

A) To encrypt data

B) To ensure high availability and data redundancy

C) To reduce storage costs

D) To improve query performance

19 / 30

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

A) Full-text search

B) Sharding

C) Column indexing

D) Replica sets

20 / 30

20. Which of the following methods creates a new collection?

A) db.collection.new()

B) db.collection.insert()

C) db.newCollection()

D) db.createCollection()

21 / 30

21. Which of the following is true about GridFS?

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

B) It backs up files

C) It compresses files

D) It encrypts files

22 / 30

22. What does the mongostat command display?

A) Backup logs

B) Memory usage

C) Read/write metrics in real-time

D) Query performance statistics

23 / 30

23. Which command is used to enable SSL/TLS in MongoDB?

A) mongod --encrypt

B) mongod --enableSSL

C) mongod --secure

D) mongod --sslMode requireSSL

24 / 30

24. What feature does MongoDB Atlas provide?

A) On-premises database management

B) Local backups only

C) Cloud-hosted MongoDB instances

D) Disk-based operations

25 / 30

25. Which MongoDB version introduced schema validation?

A) 3.2

B) 4.0

C) 4.2

D) 2.4

26 / 30

26. What is the command to create a text index in MongoDB?

A) db.collection.indexText({ field: 1 })

B) db.collection.createIndex({ field: "text" })

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

D) db.collection.addTextIndex({ field: 1 })

27 / 30

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

A) mongostat

B) Ops Manager

C) MongoDB Atlas

D) mongodump

28 / 30

28. On which port does MongoDB listen by default?

A) 8080

B) 5432

C) 3306

D) 27017

29 / 30

29. How do you specify an aggregation pipeline in MongoDB?

A) db.collection.filter([ pipeline stages ])

B) db.collection.aggregate([ pipeline stages ])

C) db.collection.find([ pipeline stages ])

D) db.collection.query([ pipeline stages ])

30 / 30

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

A) Authentication

B) Sharding

C) Indexing

D) Replication

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