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.

0 votes, 0 avg

You have 30 minutes to complete the quiz. The timer will start when you click the 'Start Quiz' button. Please ensure you are ready before beginning.

Time is up! Your quiz has ended. Your responses have been submitted automatically.

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 operator in the $group stage is used to count the total number of documents in a group?

A) $total

B) $docs

C) $sum: 1

D) $count

2 / 30

2. Which of the following commands is used to take a backup of MongoDB data?

A) mongorestore

B) mongoexport

C) mongodump

D) mongoimport

3 / 30

3. What does the mongostat command display?

A) Query performance statistics

B) Backup logs

C) Read/write metrics in real-time

D) Memory usage

4 / 30

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

A) Mongos router

B) Config servers

C) Replication set

D) Primary shard

5 / 30

5. Which of the following is true about the sh.enableBalancing() command?

A) It removes a shard

B) It adds a new shard

C) It enables the balancer to redistribute chunks

D) It stops the balancer

6 / 30

6. What does the wiredTiger storage engine use to optimize performance?

A) Locking entire collections

B) Document-level concurrency control

C) A single-threaded architecture

D) File-based locking

7 / 30

7. What does the mongodump tool do?

A) Exports query results

B) Restores a database from a backup

C) Imports data into MongoDB

D) Creates a backup of a MongoDB database

8 / 30

8. Which of the following is true about GridFS?

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

B) It compresses files

C) It backs up files

D) It encrypts files

9 / 30

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

A) To enforce unique values for the indexed field

B) To allow duplicate values in the index

C) To improve sorting performance

D) To make the index case-sensitive

10 / 30

10. Which command initializes a replica set?

A) rs.start()

B) rs.init()

C) rs.setup()

D) rs.initiate()

11 / 30

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

A) They require a replica set or sharded cluster

B) They are supported only in standalone MongoDB instances

C) They are used for compressing data

D) They are not supported in MongoDB

12 / 30

12. How can you optimize MongoDB performance in a high-write workload?

A) Disable journaling

B) Reduce memory allocation

C) Increase index size

D) Use replication and sharding

13 / 30

13. How do you include only specific fields in a query result?

A) { field: 0 }

B) { field: 1 }

C) { field: true }

D) { field: include }

14 / 30

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

A) mongoexport

B) mongoimport

C) mongotop

D) mongodump

15 / 30

15. Which type of index is suitable for searching fields in natural language?

A) Text Index

B) Geospatial Index

C) Compound Index

D) Single Field Index

16 / 30

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

A) maxItems

B) arrayLimit

C) maxArraySize

D) maximum

17 / 30

17. Which of the following is true about Change Streams?

A) They can monitor changes to an entire database

B) They can monitor changes to a replica set

C) They can monitor changes to a single collection

D) All of the above

18 / 30

18. Which of the following is true about the additionalProperties keyword in a JSON schema?

A) It validates array elements

B) It allows the inclusion of extra fields

C) It allows only predefined fields in a document

D) It defines default values for fields

19 / 30

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

A) mongoexport

B) mongodump

C) mongoimport

D) mongorestore

20 / 30

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

A) The duplicate value is ignored.

B) The document is inserted without the duplicate value.

C) A new unique index is created.

D) The operation fails with an error.

21 / 30

21. What is the main advantage of a TTL index in MongoDB?

A) Prevents duplicate records

B) Reduces query time

C) Improves write performance

D) Automatically deletes old documents

22 / 30

22. What feature does MongoDB Atlas provide?

A) Cloud-hosted MongoDB instances

B) On-premises database management

C) Disk-based operations

D) Local backups only

23 / 30

23. What is the default identifier for every MongoDB document?

A) _id

B) _name

C) _key

D) _index

24 / 30

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

A) Dot notation

B) $lookup

C) $nested

D) $elemMatch

25 / 30

25. What type of MongoDB node can serve read requests in a replica set?

A) Arbiter node

B) Secondary node only

C) Both primary and secondary nodes

D) Primary node only

26 / 30

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

A) They require a fixed schema.

B) They do not support indexing.

C) Fields must be consistent across all documents.

D) They are schema-less.

27 / 30

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

A) It uses SSL/TLS encryption

B) It uses AES-256 encryption

C) It does not support encryption at rest

D) It uses RSA encryption

28 / 30

28. Which of the following is a NoSQL feature of MongoDB?

A) Flexible schema design

B) ACID transactions

C) Fixed relationships

D) Table joins

29 / 30

29. On which port does MongoDB listen by default?

A) 5432

B) 27017

C) 8080

D) 3306

30 / 30

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

A) To store metadata about files

B) To encrypt files

C) To store the actual file data

D) To compress files

Your score is

The average score is 27%

Rate Your Experience!

Anonymous feedback

Thank you for your feedback! We appreciate your input.

HTML Quiz Test Online

10 Minutes CSS Quiz Test Online

JavaScript Quiz Test Online (30 random Questions)

10 Minutes MongoDB Quiz Test Online

Bootstrap Quiz Test Online (30 random Questions)

10 Minutes JavaScript Quiz Test Online

Related