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 the default port for MongoDB?

A) 8080

B) 5432

C) 3306

D) 27017

2 / 30

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

A) fs.files.insert()

B) mongofiles

C) fs.chunks.insert()

D) gridfs.insert()

3 / 30

3. What is the default format for backups created by mongodump?

A) JSON

B) BSON

C) CSV

D) Plain Text

4 / 30

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

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

B) To enforce relationships between documents

C) To manage indexes

D) To improve query performance

5 / 30

5. What is a shard key in MongoDB?

A) A field used to partition data across shards

B) A unique identifier for each document

C) A password for accessing shards

D) A configuration file for sharding

6 / 30

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

A) 2 seconds

B) 1 second

C) 10 seconds

D) 30 seconds

7 / 30

7. How do you limit the number of documents returned in a query?

A) db.collection.limit(n)

B) db.collection.find().limit(n)

C) db.collection.resultLimit(n)

D) db.collection.query.limit(n)

8 / 30

8. MongoDB is an example of which type of database?

A) Graph

B) Document-oriented

C) Key-Value

D) Relational

9 / 30

9. Which relationship type is best handled using arrays of embedded documents?

A) All of the above

B) One-to-One

C) One-to-Many

D) Many-to-Many

10 / 30

10. Which operator is used to match all values in an array?

A) $in

B) $exists

C) $and

D) $all

11 / 30

11. What is the data type of the _id field by default?

A) ObjectId

B) String

C) Binary

D) Integer

12 / 30

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

A) To create a collection

B) To replace a document

C) To update specific fields

D) To remove fields from a document

13 / 30

13. What is the purpose of the db.dropUser() command?

A) To delete an existing user

B) To back up data

C) To create a new user

D) To encrypt data

14 / 30

14. Which of the following is true about read preferences in a replica set?

A) They determine where reads are directed (primary or secondary)

B) They determine the election process

C) They determine the write concern

D) They determine the storage engine

15 / 30

15. Which JSON schema keyword ensures that an array contains unique items?

A) uniqueArray

B) unique

C) uniqueItems

D) distinct

16 / 30

16. Which type of index is used to support text search in MongoDB?

A) Full-text Index

B) Geospatial Index

C) Compound Index

D) Text Index

17 / 30

17. Which of the following tools provides a GUI for managing MongoDB databases?

A) MongoDB CLI

B) mongosh

C) pgAdmin

D) MongoDB Compass

18 / 30

18. What does the --bind_ip option specify in the MongoDB server?

A) IP addresses allowed to connect to the server

B) Path for logs

C) Authentication method

D) Port for the server to listen on

19 / 30

19. How can you update validation rules for an existing collection?

A) db.collection.resetValidation()

B) db.collection.modifyRules()

C) db.runCommand({ collMod })

D) db.collection.updateValidation()

20 / 30

20. In MongoDB, which of the following is used for client-side interaction with the database?

A) MongoDB Compass

B) mongodump

C) mongod

D) mongo shell

21 / 30

21. Which MongoDB operation locks the database during execution?

A) countDocuments()

B) updateMany()

C) find()

D) createIndex()

22 / 30

22. Which command is used to check the installed version of MongoDB?

A) mongodb -v

B) mongod --list

C) mongo --version

D) mongo -v

23 / 30

23. Which validation level allows invalid documents to exist but prevents new invalid documents from being added?

A) moderate

B) loose

C) strict

D) off

24 / 30

24. How can sharding improve MongoDB performance?

A) By increasing document size limits

B) By distributing data across multiple servers

C) By disabling replication

D) By reducing index usage

25 / 30

25. How can you monitor slow queries in MongoDB?

A) By using the $lookup stage

B) By setting the mongo.logs file

C) By enabling the query profiler

D) By using the db.collection.index() command

26 / 30

26. What is the purpose of the db.changeUserPassword() command?

A) To encrypt data

B) To back up data

C) To create a new user

D) To change a user's password

27 / 30

27. In a normalized data model, where are related data stored?

A) In an array field

B) In the same document

C) As an index

D) In a separate collection

28 / 30

28. Which operator is used to query embedded documents in MongoDB?

A) $lookup

B) $nested

C) Dot notation

D) $elemMatch

29 / 30

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

A) $gte

B) $gteq

C) $gt

D) $lte

30 / 30

30. Which role provides full administrative access to a MongoDB database?

A) read

B) readWrite

C) dbAdmin

D) root

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