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 happens if you try to insert a duplicate value into a field with a unique index?

A) A new unique index is created.

B) The operation fails with an error.

C) The duplicate value is ignored.

D) The document is inserted without the duplicate value.

2 / 30

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

A) mongorestore

B) mongotop

C) mongoimport

D) mongos

3 / 30

3. Which command is used to enable role-based access control (RBAC) in MongoDB?

A) mongod --enableRBAC

B) mongod --secure

C) mongod --role

D) mongod --auth

4 / 30

4. Which command is used to initiate a replica set in MongoDB?

A) rs.enable()

B) rs.start()

C) rs.initiate()

D) rs.create()

5 / 30

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

A) Use a primary-only read preference

B) Use a load balancer

C) Set read preference to secondary

D) Increase the number of indexes

6 / 30

6. What is the purpose of the mongoURI connection string?

A) To backup databases

B) To restore data

C) To create indexes

D) To connect applications to MongoDB instances

7 / 30

7. What is a replica set in MongoDB?

A) A backup of the database

B) A sharded cluster

C) A group of MongoDB instances that maintain the same data set

D) A single MongoDB instance

8 / 30

8. What is the purpose of the $set operator in MongoDB?

A) To create a collection

B) To update specific fields

C) To remove fields from a document

D) To replace a document

9 / 30

9. Which of the following is NOT a key advantage of MongoDB?

A) Schema flexibility

B) Horizontal scaling

C) Fixed schema

D) High availability

10 / 30

10. Which of the following tools provides a GUI for managing MongoDB databases?

A) MongoDB Compass

B) pgAdmin

C) mongosh

D) MongoDB CLI

11 / 30

11. How do you create a single field index in MongoDB?

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

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

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

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

12 / 30

12. Which operator is used in $project to rename a field?

A) $set

B) Alias

C) : 1

D) $rename

13 / 30

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

A) Matches greater-than values

B) Matches values not in the specified array

C) Matches any value from an array of specified values

D) Checks for equality

14 / 30

14. Which of the following commands deletes a collection?

A) db.collection.drop()

B) db.collection.remove()

C) db.removeCollection()

D) db.collection.delete()

15 / 30

15. What is the primary purpose of replication in MongoDB?

A) To ensure high availability and data redundancy

B) To encrypt data

C) To reduce storage costs

D) To improve query performance

16 / 30

16. What does the $count stage in an aggregation pipeline do?

A) Counts the number of documents in the pipeline

B) Counts the total fields in a document

C) Counts the unique values in a field

D) Counts the array elements in a field

17 / 30

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

A) To act as a config server

B) To store actual data

C) To route queries to the correct shard

D) To store metadata

18 / 30

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

A) Adds a field to the $match stage

B) None

C) Adds a new field to the document

D) Combines two fields into one

19 / 30

19. What is the preferred approach for a One-to-Many relationship when the 'many' side has few documents?

A) Indexing the field

B) Embedding documents

C) Creating a separate collection

D) Using $lookup

20 / 30

20. What are Change Streams in MongoDB?

A) A feature for real-time monitoring of data changes

B) A feature for backing up data

C) A feature for compressing data

D) A feature for encrypting data

21 / 30

21. Which command is used to retrieve a file from GridFS?

A) fs.chunks.retrieve()

B) fs.files.retrieve()

C) gridfs.retrieve()

D) mongofiles

22 / 30

22. Which JSON schema keyword ensures that an array contains unique items?

A) uniqueItems

B) unique

C) distinct

D) uniqueArray

23 / 30

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

A) Collection

B) Array

C) Set

D) List

24 / 30

24. Which of the following is true about read preferences in a replica set?

A) They determine where reads are directed (primary or secondary)

B) They determine the election process

C) They determine the storage engine

D) They determine the write concern

25 / 30

25. What is the purpose of the unique option when creating an index?

A) To enforce unique values for the indexed field

B) To improve sorting performance

C) To make the index case-sensitive

D) To allow duplicate values in the index

26 / 30

26. How do you query all documents from a collection?

A) db.collection.findAll()

B) db.collection.getAll()

C) db.collection.query()

D) db.collection.find()

27 / 30

27. What feature does MongoDB Atlas provide?

A) On-premises database management

B) Cloud-hosted MongoDB instances

C) Local backups only

D) Disk-based operations

28 / 30

28. Which type of index is used to support text search in MongoDB?

A) Geospatial Index

B) Compound Index

C) Full-text Index

D) Text Index

29 / 30

29. What is the default chunk size in MongoDB?

A) 64 MB

B) 256 MB

C) 128 MB

D) 512 MB

30 / 30

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

A) Using references with $lookup

B) Using embedded documents

C) Using arrays

D) Both B and C

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