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. What is the purpose of the priority property in a replica set?

A) To determine the read preference of a node

B) To determine the storage capacity of a node

C) To determine the write concern of a node

D) To determine the likelihood of a node becoming primary

2 / 30

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

A) To handle authentication

B) To perform basic CRUD operations

C) To create indexes

D) To process and transform data in stages

3 / 30

3. What type of model does MongoDB use for data representation?

A) Tabular

B) Document

C) Object

D) Columnar

4 / 30

4. Which MongoDB operator matches documents where a field’s value equals the specified value?

A) $equal

B) $eq

C) $ne

D) $equals

5 / 30

5. What does the $match aggregation stage do?

A) Sorts documents

B) Filters documents

C) Groups documents

D) Joins collections

6 / 30

6. Which of the following is true about GridFS?

A) It compresses files

B) It backs up files

C) It encrypts files

D) It stores files in two collections: fs.files and fs.chunks

7 / 30

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

A) Use a compound index

B) Use separate indexes for each field

C) Use $regex filters

D) Avoid using indexes

8 / 30

8. Which data type is used to store an array of values in MongoDB?

A) Array

B) Set

C) List

D) Collection

9 / 30

9. How do indexes affect write performance in MongoDB?

A) They prevent write operations.

B) They slow down write performance slightly.

C) They have no impact on write performance.

D) They improve write performance.

10 / 30

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

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

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

C) db.collection.resultLimit(n)

D) db.collection.limit(n)

11 / 30

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

A) Aggregation

B) Transactions

C) Indexing

D) Sharding

12 / 30

12. Which command initializes a replica set?

A) rs.setup()

B) rs.init()

C) rs.start()

D) rs.initiate()

13 / 30

13. Which component is responsible for routing queries to the correct shard in MongoDB?

A) Shard server

B) Replica set

C) Config server

D) Mongos

14 / 30

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

A) 1 second

B) 30 seconds

C) 2 seconds

D) 10 seconds

15 / 30

15. In a sharded MongoDB cluster, which component tracks the metadata of shard distribution?

A) Mongos router

B) Replication set

C) Config servers

D) Primary shard

16 / 30

16. What does the db.collection.getIndexes() command do?

A) Lists all indexes on the collection

B) Deletes all indexes

C) Creates a default index

D) Displays the query plan

17 / 30

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

A) $join

B) $lookup

C) $merge

D) $match

18 / 30

18. What is the purpose of mongoURI?

A) Connects to replica sets

B) Restores a database

C) Exports database schemas

D) Specifies a connection string to MongoDB

19 / 30

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

A) $sort

B) $group

C) $match

D) $project

20 / 30

20. What is the function of the $or operator in MongoDB?

A) Matches documents where no condition is true

B) Matches documents with equality

C) Matches documents that satisfy one or more conditions

D) Matches documents with all conditions being true

21 / 30

21. How do you exclude a field in a query result using projection?

A) { field: false }

B) { field: 0 }

C) { field: 1 }

D) { field: -1 }

22 / 30

22. How can you distribute query load across multiple replica set members?

A) Use a load balancer

B) Use a primary-only read preference

C) Set read preference to secondary

D) Increase the number of indexes

23 / 30

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

A) db.createTimeSeries()

B) db.createTSCollection()

C) db.createTS()

D) db.createCollection()

24 / 30

24. What is the default validation level in MongoDB?

A) moderate

B) off

C) strictValidation

D) strict

25 / 30

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

A) $ne

B) $not

C) $notEq

D) $neq

26 / 30

26. Which command is used to check the status of a replica set?

A) rs.status()

B) rs.health()

C) rs.check()

D) rs.info()

27 / 30

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

A) sh.startShard()

B) sh.enableShard()

C) sh.addShard()

D) sh.createShard()

28 / 30

28. What does the pattern keyword in JSON schema validate?

A) Array elements

B) Document size

C) String fields using a regular expression

D) Numeric fields

29 / 30

29. What is the purpose of relationships in MongoDB?

A) To establish connections between data in different collections

B) To store data in a single collection

C) To index fields automatically

D) To enforce strict schemas

30 / 30

30. Which method fetches related documents using manual references?

A) $merge

B) db.collection.join(referenceId)

C) $lookup

D) db.collection.find({ _id: referenceId })

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