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 is sharding in MongoDB?

A) A method for backing up data

B) A method for distributing data across multiple servers

C) A method for encrypting data

D) A method for compressing data

2 / 30

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

A) db.collection.performance()

B) db.collection.info()

C) db.collection.explain()

D) db.collection.stats()

3 / 30

3. Which method removes an index from a collection?

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

B) db.collection.deleteIndex({ field: 1 })

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

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

4 / 30

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

A) Modify the schema to default

B) Use collMod with an empty validation object

C) db.collection.dropValidation()

D) db.collection.removeValidation()

5 / 30

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

A) $lte

B) $lt

C) $gt

D) $gte

6 / 30

6. What is the purpose of the MongoDB aggregation pipeline?

A) To perform basic CRUD operations

B) To create indexes

C) To handle authentication

D) To process and transform data in stages

7 / 30

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

A) db.collection.create()

B) db.collection.update()

C) db.collection.add()

D) db.collection.insert()

8 / 30

8. Which of the following is true about Change Streams?

A) All of the above

B) They can monitor changes to a replica set

C) They can monitor changes to an entire database

D) They can monitor changes to a single collection

9 / 30

9. Which of the following is a valid MongoDB query operator?

A) $contains

B) $search

C) $like

D) $gt

10 / 30

10. What is the purpose of the oplog in MongoDB replication?

A) To manage indexes

B) To record all write operations for replication

C) To store encrypted data

D) To log all queries

11 / 30

11. What type of MongoDB node can serve read requests in a replica set?

A) Secondary node only

B) Primary node only

C) Arbiter node

D) Both primary and secondary nodes

12 / 30

12. What is the purpose of the sh.moveChunk() command?

A) To add a new shard

B) To split a chunk

C) To merge two chunks

D) To move a chunk from one shard to another

13 / 30

13. What does the db.collection.find() operation do in MongoDB?

A) Queries data

B) Deletes data

C) Updates data

D) Inserts data

14 / 30

14. What is the purpose of roles in MongoDB?

A) To compress data

B) To define user permissions

C) To back up data

D) To encrypt data

15 / 30

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

A) Unlimited

B) 8MB

C) 32MB

D) 16MB

16 / 30

16. How do you include only specific fields in a query result?

A) { field: true }

B) { field: include }

C) { field: 0 }

D) { field: 1 }

17 / 30

17. Which MongoDB operation locks the database during execution?

A) updateMany()

B) find()

C) createIndex()

D) countDocuments()

18 / 30

18. What does { field: -1 } specify when creating an index?

A) Geospatial index

B) No index

C) Text index

D) Descending index

19 / 30

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

A) Array size limit

B) Harder to query

C) Cannot use indexes

D) Data duplication

20 / 30

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

A) Boolean

B) Integer

C) Float

D) Array

21 / 30

21. How do you query documents where a field is greater than or equal to a value?

A) $lte

B) $gte

C) $gteq

D) $gt

22 / 30

22. Which of the following methods is used to drop all indexes except _id?

A) db.collection.deleteIndexes()

B) db.collection.dropIndex("*")

C) db.collection.removeIndexes()

D) db.collection.dropIndexes()

23 / 30

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

A) To connect applications to MongoDB instances

B) To restore data

C) To create indexes

D) To backup databases

24 / 30

24. Which command is used to interact with MongoDB via the command line?

A) mongoexport

B) mongodump

C) mongotop

D) mongosh

25 / 30

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

A) db.collection.addConstraint()

B) $unique

C) db.collection.setUnique()

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

26 / 30

26. What does the --query option do in mongoexport?

A) Filters data to be exported

B) Optimizes export speed

C) Imports query results

D) Restores a database

27 / 30

27. Which stage is used to sort documents in an aggregation pipeline?

A) $match

B) $sort

C) $group

D) $project

28 / 30

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

A) To encrypt files

B) To store metadata about files

C) To store the actual file data

D) To compress files

29 / 30

29. What is a compound index?

A) An index created on a single field

B) A special type of text index

C) An index that combines multiple fields

D) A geospatial index

30 / 30

30. Which MongoDB method skips a specific number of documents in query results?

A) db.collection.limit().skip(n)

B) db.collection.query.skip(n)

C) db.collection.find().skip(n)

D) db.collection.skip()

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