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

A) mongos

B) mongoimport

C) mongotop

D) mongorestore

2 / 30

2. Which command is used to analyze query performance in MongoDB?

A) db.collection.profile()

B) db.collection.explain()

C) db.collection.analyze()

D) db.collection.performance()

3 / 30

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

A) String fields using a regular expression

B) Document size

C) Array elements

D) Numeric fields

4 / 30

4. In JSON schema, which keyword validates string formats, such as email or date?

A) pattern

B) format

C) match

D) type

5 / 30

5. What is the main advantage of referencing over embedding?

A) No need for additional collections

B) Faster read performance

C) Reduced document size

D) Simpler queries

6 / 30

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

A) Limited support for text fields

B) Increased query execution time

C) Requires schema enforcement

D) Reduced query flexibility

7 / 30

7. Which JSON schema keyword specifies the maximum number of items allowed in an array?

A) arrayLimit

B) maxArraySize

C) maxItems

D) maximum

8 / 30

8. How do you create a unique index in MongoDB?

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

B) db.collection.createIndex({ field: 1 }, { unique: true })

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

D) db.collection.index({ field: 1, unique: true })

9 / 30

9. What is the purpose of the balancer in MongoDB sharding?

A) To route queries to shards

B) To encrypt data

C) To distribute chunks evenly across shards

D) To back up data

10 / 30

10. What does the $unwind stage do in an aggregation pipeline?

A) Breaks an array field into multiple documents

B) Combines multiple fields into an array

C) Removes duplicate documents

D) Filters documents based on an array

11 / 30

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

A) To create indexes

B) To connect applications to MongoDB instances

C) To restore data

D) To backup databases

12 / 30

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

A) config

B) None

C) test

D) admin

13 / 30

13. How can sharding improve MongoDB performance?

A) By reducing index usage

B) By increasing document size limits

C) By distributing data across multiple servers

D) By disabling replication

14 / 30

14. Which validation action is the most restrictive?

A) error

B) moderate

C) warn

D) strict

15 / 30

15. Which of the following operators is used to match values less than a specified value?

A) $gte

B) $lessthan

C) $lte

D) $lt

16 / 30

16. What is the purpose of the startTransaction() command in MongoDB?

A) To compress data

B) To start a multi-document transaction

C) To encrypt data

D) To back up data

17 / 30

17. What is sharding in MongoDB?

A) A method for compressing data

B) A method for encrypting data

C) A method for backing up data

D) A method for distributing data across multiple servers

18 / 30

18. Which of the following methods creates a new collection?

A) db.collection.new()

B) db.newCollection()

C) db.collection.insert()

D) db.createCollection()

19 / 30

19. How do you sort query results in MongoDB?

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

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

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

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

20 / 30

20. What is the purpose of secondary indexes?

A) To improve write performance

B) To manage sharding configurations

C) To reduce document size

D) To speed up specific queries

21 / 30

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

A) $merge

B) $lookup

C) $match

D) $join

22 / 30

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

A) To display active queries and operations

B) To list all collections

C) To create indexes

D) To optimize query execution

23 / 30

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

A) Geospatial Index

B) Compound Index

C) Text Index

D) Single Field Index on _id

24 / 30

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

A) db.createTimeSeries()

B) db.createCollection()

C) db.createTS()

D) db.createTSCollection()

25 / 30

25. 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

26 / 30

26. What is the purpose of the db.grantRolesToUser() command?

A) To assign roles to an existing user

B) To create a new user

C) To back up data

D) To encrypt data

27 / 30

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

A) Indexing

B) Aggregation

C) Replication

D) Sharding

28 / 30

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

A) They are not atomic

B) They are atomic at the multi-document level

C) They are used for compressing data

D) They are atomic at the single-document level

29 / 30

29. What does the mongos tool manage in a MongoDB deployment?

A) Database backups

B) Sharded clusters

C) Monitoring logs

D) Replica sets

30 / 30

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

A) Authentication

B) Indexing

C) Replication

D) Sharding

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