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 does the $in operator do in MongoDB?

A) Matches values not in the specified array

B) Matches any value from an array of specified values

C) Checks for equality

D) Matches greater-than values

2 / 30

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

A) mongosh

B) mongotop

C) mongoimport

D) MongoDB Compass

3 / 30

3. How can you update validation rules for an existing collection?

A) db.collection.resetValidation()

B) db.runCommand({ collMod })

C) db.collection.modifyRules()

D) db.collection.updateValidation()

4 / 30

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

A) db.collection.find()

B) db.collection.update()

C) db.collection.delete()

D) db.collection.insert()

5 / 30

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

A) $like

B) $contains

C) $search

D) $gt

6 / 30

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

A) db.collection.size()

B) db.collection.numDocuments()

C) db.collection.count()

D) db.collection.total()

7 / 30

7. What does the $lookup stage in aggregation do?

A) Deletes related documents

B) Embeds documents in a collection

C) Creates indexes for relationships

D) Joins data from two collections

8 / 30

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

A) Fixed schema

B) Schema flexibility

C) Horizontal scaling

D) High availability

9 / 30

9. Which operator is used to query embedded documents in MongoDB?

A) $lookup

B) $nested

C) Dot notation

D) $elemMatch

10 / 30

10. How do you query documents where a field value is not in a specified array?

A) $not

B) $nin

C) $ne

D) $not_in

11 / 30

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

A) Config servers

B) Mongos router

C) Primary shard

D) Replication set

12 / 30

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

A) Database

B) Document

C) Collection

D) Field

13 / 30

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

A) from

B) localField

C) as

D) foreignField

14 / 30

14. How do you sort query results in MongoDB?

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

B) db.collection.find({}).order({ field: 1 })

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

D) db.collection.find().sort({ field: 1 })

15 / 30

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

A) They are used for compressing data

B) They are atomic at the single-document level

C) They are atomic at the multi-document level

D) They are not atomic

16 / 30

16. What is the purpose of the db.currentOp() command?

A) To list all collections

B) To optimize query execution

C) To display active queries and operations

D) To create indexes

17 / 30

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

A) config

B) test

C) None

D) admin

18 / 30

18. Which command analyzes replication performance in MongoDB?

A) db.printReplicationInfo()

B) mongostat

C) mongotop

D) db.replicaSet.stats()

19 / 30

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

A) mongodump

B) mongorestore

C) mongoimport

D) mongoexport

20 / 30

20. Which MongoDB query method limits the output to specified fields only?

A) db.collection.select({ field })

B) db.collection.query({ fields: 1 })

C) db.collection.find({}, { field: 1 })

D) db.collection.find({}, { fields })

21 / 30

21. What is the correct order of stages in the aggregation pipeline?

A) $match → $group → $project

B) $project → $match → $group

C) $group → $project → $match

D) Any order

22 / 30

22. Which MongoDB feature ensures high availability by replicating data across multiple servers?

A) Aggregation

B) Replication

C) Sharding

D) Indexing

23 / 30

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

A) db.createTimeSeries()

B) db.createTSCollection()

C) db.createCollection()

D) db.createTS()

24 / 30

24. What is a potential drawback of using $lookup?

A) Limited support for text fields

B) Requires schema enforcement

C) Increased query execution time

D) Reduced query flexibility

25 / 30

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

A) uniqueItems

B) distinct

C) unique

D) uniqueArray

26 / 30

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

A) Counts the total fields in a document

B) Counts the number of documents in the pipeline

C) Counts the unique values in a field

D) Counts the array elements in a field

27 / 30

27. What is the primary purpose of data validation in MongoDB?

A) To manage indexes

B) To enforce relationships between documents

C) To ensure that inserted or updated documents meet specific criteria

D) To improve query performance

28 / 30

28. Which of the following operators is used to match multiple values in MongoDB?

A) $or

B) $match

C) $in

D) $and

29 / 30

29. What is the purpose of secondary indexes?

A) To reduce document size

B) To improve write performance

C) To speed up specific queries

D) To manage sharding configurations

30 / 30

30. Which command provides statistics for a collection, including index usage?

A) db.collection.performance()

B) db.collection.stats()

C) db.collection.info()

D) db.collection.explain()

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