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. What is the purpose of the rs.slaveOk() command?

A) To enable writes on secondary nodes

B) To configure an arbiter

C) To initiate a replica set

D) To allow reads from secondary nodes

2 / 30

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

A) It is a single MongoDB instance

B) It is a replica set or a standalone server

C) It is a query router

D) It is a configuration server

3 / 30

3. Which of the following is a valid MongoDB query operator?

A) $search

B) $gt

C) $contains

D) $like

4 / 30

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

A) $group

B) $match

C) $jsonSchema

D) $validate

5 / 30

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

A) sh.startShard()

B) sh.addShard()

C) sh.createShard()

D) sh.enableShard()

6 / 30

6. Which of the following is true about a compound index?

A) The order of fields in a compound index matters.

B) Compound indexes cannot include more than two fields.

C) The order of fields in a compound index does not matter.

D) Compound indexes are automatically created on all fields.

7 / 30

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

A) Using embedded documents

B) Using references with $lookup

C) Using arrays

D) Both B and C

8 / 30

8. Which stage in the aggregation pipeline is used to join data from another collection?

A) $lookup

B) $join

C) $match

D) $merge

9 / 30

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

A) To perform basic CRUD operations

B) To process and transform data in stages

C) To create indexes

D) To handle authentication

10 / 30

10. What does the $match aggregation stage do?

A) Groups documents

B) Filters documents

C) Sorts documents

D) Joins collections

11 / 30

11. Which tool provides real-time monitoring of MongoDB query performance?

A) mongorestore

B) mongos

C) mongoimport

D) mongotop

12 / 30

12. 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

13 / 30

13. Which tool is used for querying and running administrative commands interactively?

A) MongoDB Compass

B) mongotop

C) mongosh

D) mongoimport

14 / 30

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

A) db.collection.total()

B) db.collection.count()

C) db.collection.numDocuments()

D) db.collection.size()

15 / 30

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

A) To store actual data

B) To act as a config server

C) To route queries to the correct shard

D) To store metadata

16 / 30

16. Which of the following is used to update a document in a collection?

A) db.collection.findAndUpdate()

B) db.collection.update()

C) db.collection.modify()

D) db.collection.save()

17 / 30

17. What is the default format for backups created by mongodump?

A) Plain Text

B) JSON

C) BSON

D) CSV

18 / 30

18. In MongoDB, which of the following is used for client-side interaction with the database?

A) mongod

B) mongodump

C) mongo shell

D) MongoDB Compass

19 / 30

19. Which of the following is true about zone sharding?

A) It requires more config servers

B) It is slower than hashed sharding

C) It allows data to be distributed based on geographic zones

D) It is not supported in MongoDB

20 / 30

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

A) Projects specific fields

B) Sorts documents

C) Filters documents

D) Groups documents by a specified field

21 / 30

21. Which aggregation stage can be used to handle Many-to-Many relationships?

A) $project

B) $group

C) $match

D) $lookup

22 / 30

22. Which of the following significantly improves query performance?

A) Creating indexes

B) Disabling validation

C) Avoiding queries with $or

D) Using large arrays

23 / 30

23. What type of index is automatically created for every MongoDB collection?

A) Geospatial Index

B) Text Index

C) Single Field Index on _id

D) Compound Index

24 / 30

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

A) mongostat

B) mongotop

C) mongos

D) mongoexport

25 / 30

25. Which tool is used to monitor the read and write operations on MongoDB collections?

A) mongostat

B) mongotop

C) mongoexport

D) mongod

26 / 30

26. How does an arbiter node help in a MongoDB replica set?

A) Optimizes indexes

B) Votes during elections

C) Stores data

D) Improves read performance

27 / 30

27. Which $lookup parameter defines the collection to join?

A) as

B) foreignField

C) from

D) localField

28 / 30

28. Which of the following is a MongoDB security feature?

A) Authentication

B) Sharding

C) Indexing

D) Replication

29 / 30

29. What does the mongostat command display?

A) Backup logs

B) Read/write metrics in real-time

C) Query performance statistics

D) Memory usage

30 / 30

30. Which of the following is true about tag-aware sharding?

A) It uses tags to compress data

B) It uses tags to back up data

C) It uses tags to encrypt data

D) It uses tags to group shards

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