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 stage is used to sort documents in an aggregation pipeline?

A) $match

B) $project

C) $group

D) $sort

2 / 30

2. How do you specify a descending sort in the $sort stage?

A) { field: "descending" }

B) { field: -1 }

C) { field: 1 }

D) { field: "desc" }

3 / 30

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

A) To create indexes

B) To restore data

C) To backup databases

D) To connect applications to MongoDB instances

4 / 30

4. Which of the following is a NoSQL feature of MongoDB?

A) Flexible schema design

B) Table joins

C) ACID transactions

D) Fixed relationships

5 / 30

5. Which is a drawback of embedding data for relationships?

A) Inefficient indexing

B) Increased write complexity

C) Data duplication

D) Requires additional queries

6 / 30

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

A) mongod --enableAudit

B) mongod --logAudit

C) mongod --audit

D) mongod --auditDestination file

7 / 30

7. Which operator is used to match multiple conditions that must all be true?

A) $nor

B) $or

C) $not

D) $and

8 / 30

8. What is the purpose of the db.grantRolesToUser() command?

A) To encrypt data

B) To assign roles to an existing user

C) To back up data

D) To create a new user

9 / 30

9. What is the maximum replication lag allowed for a secondary node to participate in elections?

A) 120 seconds

B) 30 seconds

C) 10 seconds

D) 60 seconds

10 / 30

10. What is the purpose of the mongostat tool?

A) Display database operations and metrics

B) Import data into MongoDB

C) Create indexes

D) Backup MongoDB data

11 / 30

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

A) It logs all administrative actions

B) It logs all read operations

C) It logs all write operations

D) It logs all queries

12 / 30

12. What is the recommended way to avoid performance issues with $or queries?

A) Always use aggregation pipelines

B) Use $and instead of $or

C) Avoid combining conditions

D) Optimize indexes for each condition

13 / 30

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

A) Ctrl + C in the terminal

B) killall mongod

C) All of the above

D) service mongod stop

14 / 30

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

A) One-to-Many

B) Many-to-Many

C) One-to-One

D) All of the above

15 / 30

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

A) To create a new user

B) To encrypt data

C) To back up data

D) To change a user's password

16 / 30

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

A) They store data in a compressed format

B) They are used for encrypting data

C) They are optimized for time-series data

D) They are not supported in MongoDB

17 / 30

17. In which year was MongoDB developed?

A) 2007

B) 2013

C) 2005

D) 2010

18 / 30

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

A) db.newCollection()

B) db.collection.insert()

C) db.createCollection()

D) db.collection.new()

19 / 30

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

A) : 1

B) Alias

C) $set

D) $rename

20 / 30

20. What is the format used by MongoDB to store data?

A) XML

B) CSV

C) JSON

D) BSON

21 / 30

21. Which of the following is the best practice for queries that filter on multiple fields?

A) Use $regex filters

B) Avoid using indexes

C) Use separate indexes for each field

D) Use a compound index

22 / 30

22. How do you create a single field index in MongoDB?

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

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

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

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

23 / 30

23. Which command is used to initiate a replica set in MongoDB?

A) rs.initiate()

B) rs.start()

C) rs.create()

D) rs.enable()

24 / 30

24. What is the function of the $or operator in MongoDB?

A) Matches documents where no condition is true

B) Matches documents with all conditions being true

C) Matches documents with equality

D) Matches documents that satisfy one or more conditions

25 / 30

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

A) 16MB

B) 32MB

C) 8MB

D) Unlimited

26 / 30

26. Which of the following is true about MongoDB collections?

A) They are schema-less.

B) Fields must be consistent across all documents.

C) They do not support indexing.

D) They require a fixed schema.

27 / 30

27. What MongoDB operator is commonly used in validation rules to specify field requirements?

A) $jsonSchema

B) $group

C) $match

D) $validate

28 / 30

28. Which of the following commands drops a database?

A) db.removeDatabase()

B) db.deleteDatabase()

C) dropDatabase()

D) db.dropDatabase()

29 / 30

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

A) db.dropDatabase()

B) dropDatabase()

C) db.deleteDatabase()

D) db.drop()

30 / 30

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

A) Locking entire collections

B) Document-level concurrency control

C) File-based locking

D) A single-threaded architecture

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