MongoDB Quiz Test Online (30 random Questions) 2025

Test your MongoDB knowledge with this 45-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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45 Minutes MongoDB Quiz Test Online

Test your MongoDB knowledge with this 45-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 tool is used to visualize MongoDB performance metrics?

A) mongostat

B) db.collection.analyze()

C) mongotop

D) MongoDB Compass

2 / 30

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

A) To add expressions for sorting

B) To filter documents using complex conditions

C) To count fields in a document

D) To combine multiple arrays

3 / 30

3. Which command is used to create a Change Stream in MongoDB?

A) db.collection.monitor()

B) db.collection.watch()

C) db.collection.listen()

D) db.collection.stream()

4 / 30

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

A) $exists

B) $field

C) $match

D) $include

5 / 30

5. What is a compound index?

A) An index created on a single field

B) A special type of text index

C) A geospatial index

D) An index that combines multiple fields

6 / 30

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

A) It is not supported in MongoDB

B) It is slower than hashed sharding

C) It can lead to uneven data distribution

D) It requires more config servers

7 / 30

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

A) type

B) validate

C) format

D) schema

8 / 30

8. What does the $in operator do in MongoDB?

A) Checks for equality

B) Matches any value from an array of specified values

C) Matches greater-than values

D) Matches values not in the specified array

9 / 30

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

A) It is a query router

B) It is a single MongoDB instance

C) It is a replica set or a standalone server

D) It is a configuration server

10 / 30

10. Which index type is created by default for every MongoDB collection?

A) Text index

B) Compound index

C) Single-field index on _id

D) Geospatial index

11 / 30

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

A) db.collection.numDocuments()

B) db.collection.size()

C) db.collection.total()

D) db.collection.count()

12 / 30

12. Which tool is used to manage sharded clusters in MongoDB?

A) mongotop

B) mongostat

C) mongoexport

D) mongos

13 / 30

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

A) Avoid combining conditions

B) Use $and instead of $or

C) Always use aggregation pipelines

D) Optimize indexes for each condition

14 / 30

14. What is the purpose of the withTransaction() method in MongoDB?

A) To compress data

B) To encrypt data

C) To back up data

D) To execute a transaction

15 / 30

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

A) They are atomic at the single-document level

B) They are not atomic

C) They are used for compressing data

D) They are atomic at the multi-document level

16 / 30

16. What does the $match aggregation stage do?

A) Filters documents

B) Joins collections

C) Sorts documents

D) Groups documents

17 / 30

17. Which JSON schema keyword specifies the maximum number of items allowed in an array?

A) maxArraySize

B) arrayLimit

C) maximum

D) maxItems

18 / 30

18. What is the purpose of secondary indexes?

A) To manage sharding configurations

B) To improve write performance

C) To speed up specific queries

D) To reduce document size

19 / 30

19. What does the profiler in MongoDB do?

A) Monitors slow queries

B) Compresses data

C) Creates indexes automatically

D) Removes duplicate documents

20 / 30

20. What is the purpose of mongoURI?

A) Exports database schemas

B) Connects to replica sets

C) Restores a database

D) Specifies a connection string to MongoDB

21 / 30

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

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

B) To enable sharding

C) To merge two chunks

D) To add a new shard

22 / 30

22. Which of the following MongoDB operations is used to update an existing document?

A) db.collection.delete()

B) db.collection.find()

C) db.collection.insert()

D) db.collection.update()

23 / 30

23. Which command is used to add a shard to a sharded cluster?

A) sh.enableShard()

B) sh.startShard()

C) sh.createShard()

D) sh.addShard()

24 / 30

24. Which aggregation stage is used to filter documents based on specified conditions?

A) $match

B) $project

C) $sort

D) $group

25 / 30

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

A) They automatically expire data after a certain period

B) They are not optimized for time-series data

C) They are used for encrypting data

D) They are used for compressing data

26 / 30

26. 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

27 / 30

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

A) To store metadata and configuration information

B) To store the actual data

C) To route queries to shards

D) To act as a backup server

28 / 30

28. What is the purpose of the sh.moveChunk() command?

A) To merge two chunks

B) To split a chunk

C) To add a new shard

D) To move a chunk from one shard to another

29 / 30

29. How do you include only specific fields in a query result?

A) { field: true }

B) { field: include }

C) { field: 0 }

D) { field: 1 }

30 / 30

30. Which tool is used to import data into MongoDB from JSON or CSV files?

A) mongoexport

B) mongodump

C) mongorestore

D) mongoimport

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