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

A) All of the above

B) Many-to-Many

C) One-to-Many

D) One-to-One

2 / 30

2. What does the db.collection.getIndexes() command do?

A) Deletes all indexes

B) Lists all indexes on the collection

C) Creates a default index

D) Displays the query plan

3 / 30

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

A) Includes or excludes fields in the output

B) Sorts documents

C) Groups documents by a specified field

D) Filters documents

4 / 30

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

A) It logs all read operations

B) It logs all write operations

C) It logs all queries

D) It logs all administrative actions

5 / 30

5. What is the purpose of the auditLog in MongoDB?

A) To log all read operations

B) To log all authentication attempts

C) To log all administrative actions

D) To log all queries

6 / 30

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

A) To encrypt data

B) To create a new user

C) To back up data

D) To delete an existing user

7 / 30

7. What is the default database created during MongoDB installation?

A) admin

B) test

C) None

D) config

8 / 30

8. How do you create a unique index in MongoDB?

A) db.collection.createIndex({ field: 1 }, { unique: true })

B) db.collection.index({ field: 1, unique: true })

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

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

9 / 30

9. Which operator is used in $project to rename a field?

A) $set

B) $rename

C) : 1

D) Alias

10 / 30

10. Which of the following is the correct command to create a new MongoDB database?

A) use database_name

B) createDatabase()

C) db.create()

D) createDB()

11 / 30

11. What does the pattern keyword in JSON schema validate?

A) String fields using a regular expression

B) Numeric fields

C) Document size

D) Array elements

12 / 30

12. What is the primary command to start the MongoDB server?

A) mongod

B) mongo

C) mongorestore

D) mongodump

13 / 30

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

A) mongoexport

B) mongosh

C) mongodump

D) mongotop

14 / 30

14. Which command is used to enable auditing in MongoDB?

A) mongod --logAudit

B) mongod --enableAudit

C) mongod --audit

D) mongod --auditDestination file

15 / 30

15. What is the purpose of the rs.slaveOk() command?

A) To enable writes on secondary nodes

B) To initiate a replica set

C) To configure an arbiter

D) To allow reads from secondary nodes

16 / 30

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

A) 0

B) 2

C) 10

D) 1

17 / 30

17. In JSON schema, which keyword validates string formats, such as email or date?

A) format

B) type

C) match

D) pattern

18 / 30

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

A) To optimize query execution

B) To create indexes

C) To list all collections

D) To display active queries and operations

19 / 30

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

A) It uses RSA encryption

B) It uses SSL/TLS encryption

C) It does not support encryption at rest

D) It uses AES-256 encryption

20 / 30

20. What does the mongodump tool do?

A) Exports query results

B) Restores a database from a backup

C) Imports data into MongoDB

D) Creates a backup of a MongoDB database

21 / 30

21. What was the original name of the company that developed MongoDB?

A) NoSQL Inc.

B) MongoDB Corp.

C) 10gen

D) Datastore LLC

22 / 30

22. Which MongoDB feature allows real-time data updates across related documents?

A) Aggregation

B) Change Streams

C) $lookup

D) Triggers

23 / 30

23. Which tool allows you to analyze MongoDB performance over time?

A) mongoexport

B) mongotop

C) Ops Manager

D) mongos

24 / 30

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

A) Indexing

B) Aggregation

C) Sharding

D) Transactions

25 / 30

25. Which command retrieves the total number of documents in a collection?

A) db.collection.count()

B) db.collection.numDocuments()

C) db.collection.total()

D) db.collection.size()

26 / 30

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

A) db.collection.show()

B) db.collection.structure()

C) db.collection.findOne()

D) db.collection.explain()

27 / 30

27. What is the purpose of the dbPath setting in mongod.conf?

A) To specify the database username

B) To define the path for data storage

C) To enable authentication

D) To set the default port

28 / 30

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

A) db.collection.modifyRules()

B) db.collection.resetValidation()

C) db.runCommand({ collMod })

D) db.collection.updateValidation()

29 / 30

29. Which command is used to create a user in MongoDB?

A) db.newUser()

B) db.insertUser()

C) db.createUser()

D) db.addUser()

30 / 30

30. Which MongoDB operation locks the database during execution?

A) updateMany()

B) createIndex()

C) countDocuments()

D) find()

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