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 role of config servers in MongoDB sharding?

A) To route queries to shards

B) To act as a backup server

C) To store metadata and configuration information

D) To store the actual data

2 / 30

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

A) Schema flexibility

B) Horizontal scaling

C) Fixed schema

D) High availability

3 / 30

3. What is the purpose of the keyFile in MongoDB?

A) To compress data

B) To back up data

C) To encrypt data

D) To authenticate members of a replica set

4 / 30

4. Which of the following is true about Time-series Collections?

A) They automatically expire data after a certain period

B) They are not optimized for time-series data

C) They are used for compressing data

D) They are used for encrypting data

5 / 30

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

A) db.collection.performance()

B) db.collection.analyze()

C) db.collection.profile()

D) db.collection.explain()

6 / 30

6. Which command is used to create a Change Stream in MongoDB?

A) db.collection.listen()

B) db.collection.stream()

C) db.collection.monitor()

D) db.collection.watch()

7 / 30

7. Which command initializes a replica set?

A) rs.init()

B) rs.start()

C) rs.setup()

D) rs.initiate()

8 / 30

8. Which of the following commands resets the query profiler?

A) db.setProfilingLevel(0)

B) db.resetProfiler()

C) db.system.profile.drop()

D) db.resetQueryLogs()

9 / 30

9. Which validation action is the most restrictive?

A) moderate

B) error

C) warn

D) strict

10 / 30

10. MongoDB uses which of the following as its default index for every document?

A) _key

B) _name

C) _id

D) _index

11 / 30

11. What is the purpose of the fs.files collection in GridFS?

A) To store the actual file data

B) To compress files

C) To store metadata about files

D) To encrypt files

12 / 30

12. What is sharding in MongoDB?

A) A method for distributing data across multiple servers

B) A method for compressing data

C) A method for backing up data

D) A method for encrypting data

13 / 30

13. What is the default validation level in MongoDB?

A) strict

B) off

C) strictValidation

D) moderate

14 / 30

14. Which of the following commands deletes a collection?

A) db.collection.drop()

B) db.collection.delete()

C) db.removeCollection()

D) db.collection.remove()

15 / 30

15. Which of the following is true about Time-series Collections?

A) They support efficient queries on time-based data

B) They are not optimized for time-series data

C) They are used for encrypting data

D) They are used for compressing data

16 / 30

16. What is the primary disadvantage of range-based sharding?

A) It is not supported in MongoDB

B) It is slower than hashed sharding

C) It requires more config servers

D) It can lead to uneven data distribution

17 / 30

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

A) db.collection.skip()

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

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

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

18 / 30

18. What is the recommended way to avoid performance issues with $or queries?

A) Always use aggregation pipelines

B) Use $and instead of $or

C) Optimize indexes for each condition

D) Avoid combining conditions

19 / 30

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

A) sh.createShard()

B) sh.startShard()

C) sh.enableShard()

D) sh.addShard()

20 / 30

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

A) Indexing

B) Transactions

C) Aggregation

D) Sharding

21 / 30

21. Which tool is used to manage sharded clusters in MongoDB?

A) mongotop

B) mongostat

C) mongoexport

D) mongos

22 / 30

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

A) To distribute chunks evenly across shards

B) To back up data

C) To encrypt data

D) To route queries to shards

23 / 30

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

A) Document size

B) String fields using a regular expression

C) Numeric fields

D) Array elements

24 / 30

24. What is the default installation directory for MongoDB on Windows?

A) C:Program FilesMongoDB

B) C:NoSQLMongoDB

C) C:MongoDBbin

D) C:Program FilesNoSQLMongoDB

25 / 30

25. What does the --query option do in mongoexport?

A) Optimizes export speed

B) Restores a database

C) Imports query results

D) Filters data to be exported

26 / 30

26. Which of the following is true about the votes property in a replica set?

A) It determines the write concern of a node

B) It determines the storage capacity of a node

C) It determines whether a node can vote in elections

D) It determines the read preference of a node

27 / 30

27. Which of the following is true about MongoDB encryption at rest?

A) It does not support encryption at rest

B) It uses AES-256 encryption

C) It uses RSA encryption

D) It uses SSL/TLS encryption

28 / 30

28. What is the purpose of the sh.moveChunk() command?

A) To add a new shard

B) To move a chunk from one shard to another

C) To split a chunk

D) To merge two chunks

29 / 30

29. What does the $type operator check?

A) If a field exists

B) The size of an array

C) The data type of a field

D) The value of a field

30 / 30

30. 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

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