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

What is the purpose of the auditLog in MongoDB?

A) To log all administrative actions

B) To log all read operations

C) To log all queries

D) To log all authentication attempts

2 / 30

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

A) Indexing

B) Transactions

C) Aggregation

D) Sharding

3 / 30

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

A) To allow duplicate values in the index

B) To enforce unique values for the indexed field

C) To improve sorting performance

D) To make the index case-sensitive

4 / 30

Which file is used to configure the MongoDB server?

A) mongod.cfg

B) mongos.conf

C) mongod.conf

D) mongod.config

5 / 30

Which tool allows you to analyze MongoDB performance over time?

A) mongotop

B) mongoexport

C) Ops Manager

D) mongos

6 / 30

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 single collection

C) All of the above

D) They can monitor changes to a replica set

7 / 30

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

A) _name

B) _key

C) _id

D) _index

8 / 30

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

A) Filters documents based on an array

B) Combines multiple fields into an array

C) Breaks an array field into multiple documents

D) Removes duplicate documents

9 / 30

Which operator is used to match all values in an array?

A) $and

B) $all

C) $exists

D) $in

10 / 30

Which of the following is true about MongoDB field-level encryption?

A) It encrypts the entire database

B) It is not supported in MongoDB

C) It encrypts only the _id field

D) It encrypts specific fields in a document

11 / 30

Which of the following is true about tag-aware sharding?

A) It uses tags to back up data

B) It uses tags to encrypt data

C) It uses tags to group shards

D) It uses tags to compress data

12 / 30

How can you ensure MongoDB starts automatically after a system reboot?

A) Add mongod to startup scripts

B) Use systemctl enable mongod on Linux

C) Enable MongoDB as a system service

D) All of the above

13 / 30

How does MongoDB ensure write durability?

A) By enabling journaling

B) By creating multiple indexes

C) By sharding data

D) Using query profiling

14 / 30

Which of the following commands drops a database?

A) db.deleteDatabase()

B) dropDatabase()

C) db.removeDatabase()

D) db.dropDatabase()

15 / 30

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

A) $lookup

B) Change Streams

C) Aggregation

D) Triggers

16 / 30

What does the $group stage do in the aggregation pipeline?

A) Groups documents by a specified field

B) Projects specific fields

C) Filters documents

D) Sorts documents

17 / 30

What is MongoDB Atlas?

A) A GUI for managing databases

B) A command-line tool for MongoDB

C) A cloud-based database service

D) A backup tool

18 / 30

Which of the following MongoDB operations is used to update an existing document?

A) db.collection.delete()

B) db.collection.find()

C) db.collection.update()

D) db.collection.insert()

19 / 30

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

A) db.collection.explain()

B) db.collection.performance()

C) db.collection.stats()

D) db.collection.info()

20 / 30

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

A) mongoimport

B) mongoexport

C) mongodump

D) mongorestore

21 / 30

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

A) $project

B) $match

C) $sort

D) $group

22 / 30

How many nodes are required to form a replica set in MongoDB?

A) 4

B) 3

C) 1

D) 2

23 / 30

Which of the following is a valid MongoDB query operator?

A) $contains

B) $gt

C) $like

D) $search

24 / 30

How do you limit the number of documents returned in a query?

A) db.collection.query.limit(n)

B) db.collection.limit(n)

C) db.collection.resultLimit(n)

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

25 / 30

What is a chunk in MongoDB sharding?

A) A subset of data within a shard

B) A single document

C) A configuration file

D) A query router

26 / 30

What is a compound index?

A) An index that combines multiple fields

B) A special type of text index

C) An index created on a single field

D) A geospatial index

27 / 30

In which year was MongoDB developed?

A) 2013

B) 2010

C) 2007

D) 2005

28 / 30

What is the purpose of the $push operator?

A) Append a value to an array

B) Add a field

C) Update multiple documents

D) Delete an array

29 / 30

Which of the following is a key feature of MongoDB?

A) High availability and scalability

B) Supports only text data

C) SQL support

D) Fixed schema

30 / 30

How does an arbiter node help in a MongoDB replica set?

A) Votes during elections

B) Stores data

C) Optimizes indexes

D) Improves read performance

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