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. How can you check the structure of a collection's documents?

A) db.collection.show()

B) db.collection.structure()

C) db.collection.explain()

D) db.collection.findOne()

2 / 30

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

A) Counts the total fields in a document

B) Counts the unique values in a field

C) Counts the number of documents in the pipeline

D) Counts the array elements in a field

3 / 30

3. Which of the following is true about GridFS?

A) It encrypts files

B) It compresses files

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

D) It backs up files

4 / 30

4. Which of the following operations is used to insert a document into a MongoDB collection?

A) db.collection.insert()

B) db.collection.update()

C) db.collection.find()

D) db.collection.delete()

5 / 30

5. What is the role of a delayed secondary node?

A) To delay replication for disaster recovery purposes

B) To handle write operations

C) To act as an arbiter

D) To speed up replication

6 / 30

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

A) Text index

B) Single-field index on _id

C) Geospatial index

D) Compound index

7 / 30

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

A) Checks for equality

B) Matches values not in the specified array

C) Matches greater-than values

D) Matches any value from an array of specified values

8 / 30

8. How can you bypass validation rules for a specific operation?

A) Use the bypassDocumentValidation: true option in the query

B) Modify the collection schema

C) Use the --bypassValidation option

D) Use the skipValidation command

9 / 30

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

A) foreignField

B) from

C) localField

D) as

10 / 30

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

A) db.collection.total()

B) db.collection.size()

C) db.collection.count()

D) db.collection.numDocuments()

11 / 30

11. Which of the following commands drops a database?

A) dropDatabase()

B) db.removeDatabase()

C) db.deleteDatabase()

D) db.dropDatabase()

12 / 30

12. What is the default database created during MongoDB installation?

A) None

B) admin

C) test

D) config

13 / 30

13. What is the smallest unit of data in MongoDB?

A) Database

B) Document

C) Collection

D) Field

14 / 30

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

A) { field: 1 }

B) { field: 0 }

C) { field: -1 }

D) { field: false }

15 / 30

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

A) Array

B) Collection

C) List

D) Set

16 / 30

16. Which MongoDB method skips a specific number of documents in query results?

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

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

C) db.collection.skip()

D) db.collection.query.skip(n)

17 / 30

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

A) $lm

B) $skip

C) $match

D) $limit

18 / 30

18. Which MongoDB version introduced schema validation?

A) 4.0

B) 2.4

C) 4.2

D) 3.2

19 / 30

19. What is the default database in MongoDB?

A) test

B) system

C) default

D) admin

20 / 30

20. Which operator is used to match all values in an array?

A) $exists

B) $in

C) $and

D) $all

21 / 30

21. Which stage combines documents from multiple pipelines into a single result?

A) $unionWith

B) $group

C) $lookup

D) $merge

22 / 30

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

A) Aggregation

B) Transactions

C) Indexing

D) Sharding

23 / 30

23. Which MongoDB component is responsible for routing queries in a sharded cluster?

A) mongostat

B) mongod

C) mongos

D) mongotop

24 / 30

24. Which of the following is true about MongoDB field-level encryption?

A) It encrypts specific fields in a document

B) It encrypts the entire database

C) It encrypts only the _id field

D) It is not supported in MongoDB

25 / 30

25. What is the primary command to start the MongoDB server?

A) mongorestore

B) mongo

C) mongodump

D) mongod

26 / 30

26. How does MongoDB ensure write durability?

A) By sharding data

B) By enabling journaling

C) Using query profiling

D) By creating multiple indexes

27 / 30

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

A) db.createTS()

B) db.createCollection()

C) db.createTSCollection()

D) db.createTimeSeries()

28 / 30

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

A) Arbiter node

B) Primary node

C) Hidden node

D) Secondary node

29 / 30

29. Which of the following is a type of relationship in MongoDB?

A) One-to-Many

B) All of the above

C) Many-to-Many

D) One-to-One

30 / 30

30. Which of the following is true about MongoDB collections?

A) Fields must be consistent across all documents.

B) They do not support indexing.

C) They are schema-less.

D) They require a fixed schema.

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