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 node in a replica set handles all write operations?

A) Primary node

B) Secondary node

C) Arbiter node

D) Hidden node

2 / 30

2. What is the default validation level in MongoDB?

A) moderate

B) off

C) strict

D) strictValidation

3 / 30

3. Which method removes an index from a collection?

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

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

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

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

4 / 30

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

A) db.collection.new()

B) db.collection.insert()

C) db.newCollection()

D) db.createCollection()

5 / 30

5. What is the purpose of relationships in MongoDB?

A) To store data in a single collection

B) To establish connections between data in different collections

C) To enforce strict schemas

D) To index fields automatically

6 / 30

6. How can you optimize MongoDB performance in a high-write workload?

A) Disable journaling

B) Use replication and sharding

C) Reduce memory allocation

D) Increase index size

7 / 30

7. What is the purpose of the $limit stage in the aggregation pipeline?

A) Filters documents based on conditions

B) Groups documents by a field

C) Joins two collections

D) Restricts the number of documents processed

8 / 30

8. Which command is used to access the MongoDB shell?

A) mongosh

B) mongo-client

C) mongo shell

D) mongodb

9 / 30

9. Which of the following commands creates a new database in MongoDB?

A) use database_name

B) db.createDatabase()

C) createDatabase()

D) db.create()

10 / 30

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

A) Filters documents

B) Sorts documents

C) Groups documents by a specified field

D) Includes or excludes fields in the output

11 / 30

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

A) To encrypt data

B) To back up data

C) To delete an existing user

D) To create a new user

12 / 30

12. Which operator in the $group stage is used to count the total number of documents in a group?

A) $sum: 1

B) $total

C) $count

D) $docs

13 / 30

13. What is a chunk in MongoDB sharding?

A) A configuration file

B) A single document

C) A subset of data within a shard

D) A query router

14 / 30

14. What is GridFS in MongoDB?

A) A feature for encrypting data

B) A feature for backing up data

C) A feature for storing and retrieving large files

D) A feature for compressing data

15 / 30

15. Which command initializes a replica set?

A) rs.start()

B) rs.initiate()

C) rs.init()

D) rs.setup()

16 / 30

16. Which command is used to analyze query performance in MongoDB?

A) db.collection.profile()

B) db.collection.analyze()

C) db.collection.explain()

D) db.collection.performance()

17 / 30

17. Which MongoDB tool is used to analyze performance metrics using historical data?

A) Ops Manager

B) mongostat

C) mongodump

D) MongoDB Atlas

18 / 30

18. Which of the following is true about MongoDB Transactions?

A) They are not atomic

B) They are used for compressing data

C) They are atomic at the single-document level

D) They are atomic at the multi-document level

19 / 30

19. Which of the following is a key feature of MongoDB?

A) Supports only text data

B) High availability and scalability

C) SQL support

D) Fixed schema

20 / 30

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

A) To perform basic CRUD operations

B) To handle authentication

C) To process and transform data in stages

D) To create indexes

21 / 30

21. What does the $addFields stage do in MongoDB?

A) Combines two fields into one

B) None

C) Adds a field to the $match stage

D) Adds a new field to the document

22 / 30

22. Which aggregation stage is used to combine multiple documents into a single output document with cumulative calculations?

A) $project

B) $sort

C) $group

D) $match

23 / 30

23. Which command is used to enable SSL/TLS in MongoDB?

A) mongod --enableSSL

B) mongod --secure

C) mongod --sslMode requireSSL

D) mongod --encrypt

24 / 30

24. What is the role of an arbiter in a replica set?

A) To store data

B) To act as a backup node

C) To participate in elections but not store data

D) To handle write operations

25 / 30

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

A) 30 seconds

B) 2 seconds

C) 1 second

D) 10 seconds

26 / 30

26. How do indexes affect write performance in MongoDB?

A) They slow down write performance slightly.

B) They have no impact on write performance.

C) They improve write performance.

D) They prevent write operations.

27 / 30

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

A) $match

B) $jsonSchema

C) $validate

D) $group

28 / 30

28. What is the correct order of stages in the aggregation pipeline?

A) $group → $project → $match

B) $project → $match → $group

C) Any order

D) $match → $group → $project

29 / 30

29. What is the role of the mongos process in MongoDB sharding?

A) To store metadata

B) To act as a config server

C) To store actual data

D) To route queries to the correct shard

30 / 30

30. What is the primary disadvantage of range-based sharding?

A) It is slower than hashed sharding

B) It is not supported in MongoDB

C) It can lead to uneven data distribution

D) It requires more config servers

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