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 MongoDB feature prevents large write operations from overwhelming the database?

A) Query profiler

B) Write concern

C) Capped collections

D) Read preference

2 / 30

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

A) Sharding

B) Indexing

C) Transactions

D) Aggregation

3 / 30

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

A) Creates indexes for relationships

B) Deletes related documents

C) Embeds documents in a collection

D) Joins data from two collections

4 / 30

4. Which type of geospatial index does MongoDB support?

A) 2D sphere index

B) Both A and C

C) 2D index

D) 3D index

5 / 30

5. What is the purpose of Time-series Collections in MongoDB?

A) To store and query time-series data efficiently

B) To encrypt data

C) To compress data

D) To back up data

6 / 30

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

A) To process and transform data in stages

B) To handle authentication

C) To create indexes

D) To perform basic CRUD operations

7 / 30

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

A) To store metadata

B) To store actual data

C) To route queries to the correct shard

D) To act as a config server

8 / 30

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

A) To remove roles from an existing user

B) To create a new user

C) To encrypt data

D) To back up data

9 / 30

9. Which operator checks if a field exists in a document?

A) $include

B) $match

C) $exists

D) $field

10 / 30

10. What is the default collation for indexes in MongoDB?

A) Binary

B) Language-specific

C) Case-sensitive

D) Case-insensitive

11 / 30

11. What is the purpose of secondary indexes?

A) To manage sharding configurations

B) To reduce document size

C) To improve write performance

D) To speed up specific queries

12 / 30

12. How can sharding improve MongoDB performance?

A) By disabling replication

B) By reducing index usage

C) By increasing document size limits

D) By distributing data across multiple servers

13 / 30

13. How do indexes affect write performance in MongoDB?

A) They prevent write operations.

B) They have no impact on write performance.

C) They improve write performance.

D) They slow down write performance slightly.

14 / 30

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

A) Change Streams

B) Triggers

C) Aggregation

D) $lookup

15 / 30

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

A) Avoid using indexes

B) Use separate indexes for each field

C) Use $regex filters

D) Use a compound index

16 / 30

16. Which node in a replica set handles all write operations?

A) Arbiter node

B) Hidden node

C) Primary node

D) Secondary node

17 / 30

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

A) db.createUser()

B) db.addUser()

C) db.insertUser()

D) db.newUser()

18 / 30

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

A) $project → $match → $group

B) $group → $project → $match

C) Any order

D) $match → $group → $project

19 / 30

19. What is the $expr operator used for in an aggregation pipeline?

A) To count fields in a document

B) To filter documents using complex conditions

C) To combine multiple arrays

D) To add expressions for sorting

20 / 30

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

A) To store data

B) To participate in elections but not store data

C) To handle write operations

D) To act as a backup node

21 / 30

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

A) They require a replica set or sharded cluster

B) They are not supported in MongoDB

C) They are used for compressing data

D) They are supported only in standalone MongoDB instances

22 / 30

22. Which stage limits the number of documents in an aggregation pipeline?

A) $limit

B) $lm

C) $match

D) $skip

23 / 30

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

A) _name

B) _id

C) _index

D) _key

24 / 30

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

A) To back up data

B) To encrypt data

C) To change a user's password

D) To create a new user

25 / 30

25. Which MongoDB tool provides a cloud backup and recovery solution?

A) mongostat

B) mongodump

C) Ops Manager

D) MongoDB Atlas

26 / 30

26. What is the role of config servers in MongoDB sharding?

A) To store the actual data

B) To route queries to shards

C) To act as a backup server

D) To store metadata and configuration information

27 / 30

27. Which of the following is true about hashed sharding?

A) It uses a range-based shard key

B) It is not supported in MongoDB

C) It uses a hash function to distribute data

D) It is slower than range-based sharding

28 / 30

28. What does the mongostat command display?

A) Memory usage

B) Query performance statistics

C) Backup logs

D) Read/write metrics in real-time

29 / 30

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

A) Sharding

B) Indexing

C) Transactions

D) Aggregation

30 / 30

30. Which of the following is true about a shard in MongoDB?

A) It is a query router

B) It is a configuration server

C) It is a single MongoDB instance

D) It is a replica set or a standalone server

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