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

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

B) db.collection.resultLimit(n)

C) db.collection.limit(n)

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

2 / 30

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

A) pgAdmin

B) MongoDB Compass

C) MongoDB CLI

D) mongosh

3 / 30

3. MongoDB Atlas provides which type of deployment?

A) Private cloud only

B) In-memory only

C) Fully managed cloud clusters

D) On-premises

4 / 30

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

A) db.collection.addConstraint()

B) $unique

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

D) db.collection.setUnique()

5 / 30

5. Which storage option ensures faster reads for frequently accessed data?

A) Disk-based storage

B) Compressed storage

C) In-memory storage

D) Distributed storage

6 / 30

6. What is the purpose of the sh.splitAt() command?

A) To merge two chunks

B) To split a chunk at a specific shard key value

C) To enable sharding

D) To add a new shard

7 / 30

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

A) Relational

B) Key-Value

C) Document-oriented

D) Graph

8 / 30

8. How can sharding improve MongoDB performance?

A) By distributing data across multiple servers

B) By disabling replication

C) By increasing document size limits

D) By reducing index usage

9 / 30

9. What happens if you try to insert a duplicate value into a field with a unique index?

A) The duplicate value is ignored.

B) The operation fails with an error.

C) The document is inserted without the duplicate value.

D) A new unique index is created.

10 / 30

10. What is the default identifier for every MongoDB document?

A) _id

B) _name

C) _key

D) _index

11 / 30

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

A) Descending index

B) No index

C) Text index

D) Geospatial index

12 / 30

12. Which command removes all documents from a collection?

A) db.collection.delete()

B) db.collection.removeAll()

C) db.collection.deleteMany({})

D) db.collection.drop()

13 / 30

13. How are One-to-One relationships typically modeled in MongoDB?

A) Using references with $lookup

B) Using arrays

C) Both B and C

D) Using embedded documents

14 / 30

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

A) All of the above

B) One-to-Many

C) One-to-One

D) Many-to-Many

15 / 30

15. What does the $type operator check?

A) The value of a field

B) If a field exists

C) The data type of a field

D) The size of an array

16 / 30

16. How do you query documents where a field is not equal to a specific value?

A) $ne

B) $not

C) $notEq

D) $neq

17 / 30

17. Which of the following is true about secondary nodes?

A) They do not participate in elections

B) They handle all write operations

C) They are read-only

D) They replicate data from the primary node

18 / 30

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

A) db.insertUser()

B) db.addUser()

C) db.newUser()

D) db.createUser()

19 / 30

19. What does the $match aggregation stage do?

A) Filters documents

B) Sorts documents

C) Joins collections

D) Groups documents

20 / 30

20. Which command is used to enable role-based access control (RBAC) in MongoDB?

A) mongod --role

B) mongod --secure

C) mongod --auth

D) mongod --enableRBAC

21 / 30

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

A) Harder to query

B) Data duplication

C) Array size limit

D) Cannot use indexes

22 / 30

22. What does the $group stage do in the aggregation pipeline?

A) Filters documents

B) Projects specific fields

C) Groups documents by a specified field

D) Sorts documents

23 / 30

23. In MongoDB, what is used to represent a single record of data?

A) Tuple

B) Document

C) Row

D) Table

24 / 30

24. Which of the following operators is used to match values less than a specified value?

A) $gte

B) $lte

C) $lt

D) $lessthan

25 / 30

25. Which keyword in JSON schema specifies the data type of a field?

A) schema

B) format

C) validate

D) type

26 / 30

26. Which command is used to create a Time-series Collection in MongoDB?

A) db.createTimeSeries()

B) db.createCollection()

C) db.createTS()

D) db.createTSCollection()

27 / 30

27. What is a replica set in MongoDB?

A) A single MongoDB instance

B) A sharded cluster

C) A backup of the database

D) A group of MongoDB instances that maintain the same data set

28 / 30

28. What is the purpose of the mongostat tool?

A) Backup MongoDB data

B) Create indexes

C) Display database operations and metrics

D) Import data into MongoDB

29 / 30

29. What does the $lookup stage in aggregation do?

A) Deletes related documents

B) Embeds documents in a collection

C) Joins data from two collections

D) Creates indexes for relationships

30 / 30

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

A) $exists

B) $in

C) $and

D) $all

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