MCQs

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Overall MCQs for Reference

What type of database is MongoDB?
a. Relational
b. Document-oriented NoSQL
c. Graph
d. Key-Value
Answer: b. Document-oriented NoSQLsanfoundry+1
In MongoDB, a “collection” refers to:
a. A table in a relational database
b. A group of databases
c. A group of documents
d. A schema definition
Answer: c. A group of documentsdatacamp+1
What is the basic unit of data in MongoDB?
a. Table
b. Row
c. Document
d. Attribute
Answer: c. Documentgeeksforgeeks+1
Which query language does MongoDB use?
a. SQL
b. MQL
c. PQL
d. HQL
Answer: b. MQLmongodb
What is the default format for storing data in MongoDB?
a. XML
b. JSON
c. BSON
d. CSV
Answer: c. BSONgeeksforgeeks
Which operation is NOT part of CRUD in MongoDB?
a. Create
b. Remove
c. Upload
d. Update
Answer: c. Uploadgeeksforgeeks+1
The method to insert a single document in MongoDB is:
a. addOne()
b. insertOne()
c. appendDoc()
d. put()
Answer: b. insertOne()datacamp
How are relationships most commonly handled in MongoDB?
a. Foreign keys
b. Embedded documents and references
c. Joins
d. Linked tables
Answer: b. Embedded documents and referencesmongodb
Which type of index improves the speed of text search in MongoDB?
a. Geospatial index
b. Single-field index
c. Text index
d. Compound index
Answer: c. Text indexinterviewbit
In which scenario is sharding used in MongoDB?
a. To back up data
b. To distribute data across servers
c. To validate schema
d. To manage users
Answer: b. To distribute data across serversinterviewbit+1
The aggregation framework in MongoDB is primarily used for:
a. Security
b. Summarizing and transforming data
c. Data backup
d. File storage
Answer: b. Summarizing and transforming datahevodata+1
Which datatype is unique to MongoDB compared to traditional databases?
a. String
b. Int
c. ObjectId
d. Double
Answer: c. ObjectIdsanfoundry
The command to delete documents matching a filter in MongoDB is:
a. remove()
b. delete()
c. deleteMany()
d. erase()
Answer: c. deleteMany()sanfoundry+1
Which operation retrieves specific fields instead of all document fields in MongoDB queries?
a. selectFields()
b. projection
c. filter
d. specify()
Answer: b. projectionmongodb+1
What feature enables scalability and high availability in MongoDB?
a. Single-server deployment
b. Replication
c. Data normalization
d. CSV exports
Answer: b. Replicationgeeksforgeeks+1
MongoDB stores documents in which format on disk?
a. YAML
b. BSON
c. HTML
d. CSV
Answer: b. BSONgeeksforgeeks
Which operator is used for pattern matching in MongoDB queries?
a. LIKE
b. find()
c. $regex
d. MATCH
Answer: c. $regexsanfoundry
The term “NoSQL” in context of MongoDB primarily means:
a. No queries
b. Not only SQL; flexible schema
c. Not for servers
d. No support for data science
Answer: b. Not only SQL; flexible schemadatacamp+1
GridFS in MongoDB is designed for:
a. SQL queries
b. Storing large files
c. Encrypted connections
d. Network partitioning
Answer: b. Storing large filessanfoundry
Which shell is native for MongoDB?
a. mongo
b. mySQL
c. mongoDBshell
d. shellJS
Answer: a. mongodatacamp+1
Which operator is used for joining collections in aggregation?
a. $merge
b. $lookup
c. $group
d. $union
Answer: b. $lookuphevodata+1
Which command creates an index on a collection field?
a. indexField()
b. createIndex()
c. addIndex()
d. makeIndex()
Answer: b. createIndex()interviewbit
Which type of data model enables documents to have different fields in MongoDB?
a. Static schema
b. Flexible schema
c. Flat schema
d. Tree schema
Answer: b. Flexible schemamongodb
Which aggregation operator groups documents by specific fields?
a. $sort
b. $unwind
c. $group
d. $match
Answer: c. $groupsanfoundry
Which of the following is NOT a valid MongoDB datatype?
a. String
b. Integer
c. Blob
d. Date
Answer: c. Blobsanfoundry
Which function allows importing JSON or CSV into MongoDB?
a. importData()
b. mongoimport
c. insertBulk()
d. loadData()
Answer: b. mongoimportw3schools+1
In data science, MongoDB is especially helpful for:
a. Storing flat files only
b. Handling unstructured or semi-structured data
c. Only analytical queries
d. Predefining all schemas
Answer: b. Handling unstructured or semi-structured datahevodata+1
Which operation would update multiple documents in MongoDB?
a. update()
b. updateMany()
c. modifyMany()
d. changeAll()
Answer: b. updateMany()sanfoundry
What does “replica set” mean in MongoDB?
a. Multiple unrelated servers
b. Group of mongod processes that maintain the same data set
c. Redundant schema definitions
d. Indexed grouping
Answer: b. Group of mongod processes that maintain the same data setinterviewbit+1
Which of these best describes MongoDB’s approach to scalability?
a. Vertical only
b. Horizontal sharding
c. Only in-memory scaling
d. No scaling capability
Answer: b. Horizontal shardinggeeksforgeeks+1
MongoDB supports which of the following for real-time analytics:
a. Predefined batch reports
b. Data streaming and aggregation pipelines
c. Only offline reports
d. Indexes only
Answer: b. Data streaming and aggregation pipelinesmongodb+1
How does MongoDB secure data in transit?
a. Using SSL/TLS
b. Using base64 encoding
c. Using hashing only
d. Plain communication only
Answer: a. Using SSL/TLSgeeksforgeeks+1
Which command displays all databases in MongoDB?
a. show tables
b. show dbs
c. show databases
d. dbs list
Answer: b. show dbsdatacamp+1
Which of these is NOT a benefit of MongoDB’s schema-less nature?
a. Flexible data structures
b. Easy to evolve schema
c. Strong referential integrity
d. Documents with different fields
Answer: c. Strong referential integritydatacamp+1
What does the command db.collection.find({}) do?
a. Deletes all documents
b. Updates all documents
c. Returns all documents
d. Returns one document
Answer: c. Returns all documentsdatacamp+1
Which storage engine is default for MongoDB 4.x+?
a. WiredTiger
b. InnoDB
c. MMAPv1
d. RocksDB
Answer: a. WiredTigergeeksforgeeks+1
Which MongoDB method can be used to add a new field to existing documents?
a. $set
b. $group
c. $addToSet
d. $push
Answer: a. $setdatacamp+1
When does MongoDB use replica sets?
a. For sharded clusters only
b. For high availability and failover
c. Only for analytics
d. For exporting data
Answer: b. For high availability and failoverinterviewbit+1
Geospatial queries in MongoDB require which type of index?
a. Text
b. 2d or 2dsphere
c. Compound
d. TTL
Answer: b. 2d or 2dsphereinterviewbit+1
Which function creates a new database in MongoDB?
a. create database
b. use <db_name>
c. newDatabase()
d. db.create()
Answer: b. use <db_name>datacamp+1
Transaction support was introduced in MongoDB version:
a. 2.2
b. 3.6
c. 4.0
d. 5.0
Answer: c. 4.0sanfoundry
The primary node in a replica set:
a. Reads only
b. Can accept writes
c. Handles backups only
d. Stores indexes only
Answer: b. Can accept writesinterviewbit+1
Which method removes a collection in MongoDB?
a. remove()
b. drop()
c. deleteAll()
d. eraseCollection()
Answer: b. drop()datacamp+1
What is the role of the $unwind operator in aggregation?
a. Joins collections
b. Sorts arrays
c. Deconstructs array fields
d. Groups by fields
Answer: c. Deconstructs array fieldshevodata+1
Which command updates one document based on a filter?
a. updateOne()
b. updateSingle()
c. updateDoc()
d. editOne()
Answer: a. updateOne()sanfoundry+1
What is a capped collection?
a. Unlimited size collection
b. Fixed-size collection that overwrites oldest entries
c. Only numeric fields allowed
d. Supports only single primary key
Answer: b. Fixed-size collection that overwrites oldest entriesinterviewbit+1
MongoDB Atlas is:
a. Database driver
b. Managed cloud database service
c. CLI tool
d. Backup utility
Answer: b. Managed cloud database servicemongodb
What is the default port for MongoDB?
a. 3306
b. 1521
c. 27017
d. 5432
Answer: c. 27017datacamp+1
To export data from MongoDB, which tool is used?
a. mongoexport
b. mongodump
c. exportdb
d. mongobackup
Answer: a. mongoexportw3schools+1
Why is MongoDB popular in data science?
a. Only handles tabular data
b. Maps to object-oriented data models; handles large, varied data easily
c. Requires fixed schemas
d. No support for aggregation
Answer: b. Maps to object-oriented data models; handles large, varied data easilyhevodata+1

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