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

Which operator is used to match multiple conditions that must all be true?

A) $nor

B) $not

C) $and

D) $or

2 / 30

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

A) $merge

B) $join

C) $lookup

D) $match

3 / 30

Which command is used to access the MongoDB shell?

A) mongo shell

B) mongo-client

C) mongosh

D) mongodb

4 / 30

What feature does MongoDB Atlas provide?

A) Cloud-hosted MongoDB instances

B) Disk-based operations

C) Local backups only

D) On-premises database management

5 / 30

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 merge two chunks

D) To split a chunk

6 / 30

What is the purpose of an index in MongoDB?

A) To improve query performance

B) To reduce storage size

C) To enforce schema validation

D) To create relationships between documents

7 / 30

What is the purpose of the oplog in MongoDB?

A) To monitor server logs

B) To manage indexes

C) To store schema validation rules

D) To track replication

8 / 30

How do you query all documents from a collection?

A) db.collection.find()

B) db.collection.getAll()

C) db.collection.query()

D) db.collection.findAll()

9 / 30

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

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

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

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

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

10 / 30

Which stage is used to sort documents in an aggregation pipeline?

A) $match

B) $project

C) $group

D) $sort

11 / 30

Which of the following is a MongoDB security feature?

A) Authentication

B) Sharding

C) Replication

D) Indexing

12 / 30

Which MongoDB operator matches documents where a field’s value equals the specified value?

A) $equal

B) $equals

C) $ne

D) $eq

13 / 30

What is the default identifier for every MongoDB document?

A) _id

B) _index

C) _name

D) _key

14 / 30

Which of the following methods creates a new collection?

A) db.collection.insert()

B) db.newCollection()

C) db.createCollection()

D) db.collection.new()

15 / 30

What is the main advantage of referencing over embedding?

A) Faster read performance

B) No need for additional collections

C) Reduced document size

D) Simpler queries

16 / 30

Which is a drawback of embedding data for relationships?

A) Inefficient indexing

B) Requires additional queries

C) Increased write complexity

D) Data duplication

17 / 30

Which of the following is used to update a document in a collection?

A) db.collection.findAndUpdate()

B) db.collection.modify()

C) db.collection.save()

D) db.collection.update()

18 / 30

Which feature does MongoDB offer to ensure data redundancy and high availability?

A) Column indexing

B) Sharding

C) Full-text search

D) Replica sets

19 / 30

Which command analyzes replication performance in MongoDB?

A) mongostat

B) db.replicaSet.stats()

C) mongotop

D) db.printReplicationInfo()

20 / 30

What is the purpose of roles in MongoDB?

A) To define user permissions

B) To back up data

C) To encrypt data

D) To compress data

21 / 30

How are One-to-One relationships typically modeled in MongoDB?

A) Both B and C

B) Using arrays

C) Using embedded documents

D) Using references with $lookup

22 / 30

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

A) { field: 1 }

B) { field: false }

C) { field: -1 }

D) { field: 0 }

23 / 30

What is a shard key in MongoDB?

A) A unique identifier for each document

B) A password for accessing shards

C) A configuration file for sharding

D) A field used to partition data across shards

24 / 30

What is the purpose of the dbPath setting in mongod.conf?

A) To enable authentication

B) To set the default port

C) To define the path for data storage

D) To specify the database username

25 / 30

How do you specify a descending sort in the $sort stage?

A) { field: "descending" }

B) { field: -1 }

C) { field: "desc" }

D) { field: 1 }

26 / 30

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 read preference of a node

C) It determines the storage capacity of a node

D) It determines whether a node can vote in elections

27 / 30

In a normalized data model, where are related data stored?

A) In a separate collection

B) In the same document

C) As an index

D) In an array field

28 / 30

Which MongoDB feature allows real-time data updates across related documents?

A) Change Streams

B) Aggregation

C) $lookup

D) Triggers

29 / 30

What is the default size limit for a single MongoDB document?

A) 16MB

B) 8MB

C) Unlimited

D) 32MB

30 / 30

Which validation action in MongoDB allows documents that fail validation but logs a warning?

A) skip

B) warn

C) error

D) ignore

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