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In MongoDB, which field is added by default to each document?

  • _id
  • uuid
  • doc_num
  • doc_id
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What type of index does MongoDB create by default for the _id field?

  • Compound index
  • Text index
  • Unique index
  • Sparse index
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Which method is used to remove a database in MongoDB?

  • deleteDatabase()
  • dropDatabase()
  • removeDatabase()
  • clearDatabase()
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How do you create a new database in MongoDB?

  • use <database_name>
  • newDatabase <database_name>
  • create <database_name>
  • db.newDatabase(<database_name>)
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What is GridFS used for in MongoDB?

  • Creating indexes
  • Backing up data
  • Storing large files
  • Sharding data
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Which storage engine is the default in MongoDB?

  • MMAPv1
  • WiredTiger
  • InnoDB
  • RocksDB
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What does the $set operator do in MongoDB?

  • Deletes a field
  • Updates a field
  • Adds a field
  • Queries a field
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Which command is used to start the MongoDB server?

  • mongod
  • mongo
  • mongodb
  • startmongo
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What does the MongoDB $push operator do?

  • Removes an element from an array
  • Updates an element in an array
  • Adds an element to an array
  • Queries an array
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Which data model does MongoDB use?

  • Hierarchical model
  • Network model
  • Relational model
  • Document model
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What is the purpose of the MongoDB replica set?

  • Provides high availability
  • Simplifies schema design
  • Increases speed
  • Reduces storage
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Which command is used to drop a collection in MongoDB?

  • removeCollection()
  • drop()
  • deleteCollection()
  • dropCollection()
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How do you create an index on a field in MongoDB?

  • addIndex()
  • createIndex()
  • indexField()
  • newIndex()
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Which command is used to view all collections in a database?

  • view collections
  • get collections
  • show collections
  • list collections
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How do you delete a document in MongoDB?

  • dropOne()
  • removeOne()
  • deleteOne()
  • eraseOne()
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What is MongoDB?

  • A programming language
  • A NoSQL database
  • An operating system
  • A SQL database
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Which of the following is NOT a MongoDB data type?

  • boolean
  • int32
  • varchar
  • string
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What is the use of the $lookup operator in MongoDB?

  • Deletes documents
  • Joins collections
  • Updates documents
  • Indexes fields
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Which command is used to insert a document in MongoDB?

  • insertDocument()
  • addDocument()
  • insertOne()
  • insertDoc()
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How do you list all databases in MongoDB?

  • list dbs
  • db.show()
  • db.list()
  • show dbs
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How do you import data into MongoDB?

  • mongoload
  • mongoimport
  • mongoinput
  • mongoinsert
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Which of the following is used to update a document in MongoDB?

  • changeOne()
  • updateOne()
  • modifyOne()
  • updateDoc()
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Which operator is used for a logical AND in MongoDB queries?

  • $or
  • $nor
  • $not
  • $and
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How do you restart the MongoDB server?

  • mongod restart
  • mongorestart
  • restart mongod
  • service mongod restart
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How do you check the version of MongoDB you are running?

  • mongo --version
  • db.version()
  • mongod --version
  • mongo -v
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How do you view the roles of a user in MongoDB?

  • listRoles(<username>)
  • showUserRoles(<username>)
  • show roles for <username>
  • db.getUserRoles(<username>)
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What is sharding in MongoDB?

  • Encrypting data
  • Distributing data across multiple machines
  • Compressing data
  • Backing up data
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Which of the following is NOT a MongoDB shell method?

  • find()
  • insert()
  • update()
  • add()
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How do you back up a MongoDB database?

  • mongosave
  • mongodump
  • mongobackup
  • mongoexport
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What is the maximum size of a BSON document in MongoDB?

  • 16 MB
  • 256 MB
  • 128 MB
  • 64 MB
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