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What does the 'db' command do in MongoDB?

  • Creates a new database
  • Lists all databases
  • Drops the database
  • Displays current database
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What is the role of the MongoDB config server?

  • Handles replication
  • Manages user accounts
  • Stores metadata and configuration settings for sharding
  • Backs up data
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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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Which of the following is NOT a MongoDB shell method?

  • find()
  • insert()
  • update()
  • add()
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Which operator is used for a logical AND in MongoDB queries?

  • $or
  • $nor
  • $not
  • $and
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Which command is used to rename a collection in MongoDB?

  • updateCollectionName()
  • renameCollection()
  • changeCollectionName()
  • setCollectionName()
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In MongoDB, a document is stored in which format?

  • BSON
  • CSV
  • XML
  • JSON
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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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How do you delete a document in MongoDB?

  • dropOne()
  • removeOne()
  • deleteOne()
  • eraseOne()
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What does the $unset operator do in MongoDB?

  • Sets a field to null
  • Updates a field value
  • Removes a field from a document
  • Adds a new field
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Which of the following is a valid MongoDB data type?

  • Timestamp
  • Date
  • Blob
  • Enum
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How do you back up a MongoDB database?

  • mongosave
  • mongodump
  • mongobackup
  • mongoexport
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What is MongoDB?

  • A programming language
  • A NoSQL database
  • An operating system
  • A SQL database
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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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How do you update multiple documents in MongoDB?

  • updateMany()
  • changeMany()
  • updateMultiple()
  • modifyMany()
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How do you import data into MongoDB?

  • mongoload
  • mongoimport
  • mongoinput
  • mongoinsert
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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 create a user in MongoDB?

  • addUser()
  • createUser()
  • userCreate()
  • newUser()
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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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Which MongoDB method is used to convert a collection to a capped collection?

  • setCapped()
  • makeCapped()
  • capCollection()
  • convertToCapped()
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Which method is used to remove a database in MongoDB?

  • deleteDatabase()
  • dropDatabase()
  • removeDatabase()
  • clearDatabase()
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Which aggregation pipeline stage is used to filter documents?

  • $select
  • $filter
  • $match
  • $search
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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 drop a collection in MongoDB?

  • removeCollection()
  • drop()
  • deleteCollection()
  • dropCollection()
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Which MongoDB method is used to return only specific fields?

  • returnFields()
  • select()
  • projection()
  • fields()
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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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How do you list all databases in MongoDB?

  • list dbs
  • db.show()
  • db.list()
  • show dbs
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Which of the following is NOT a MongoDB data type?

  • boolean
  • int32
  • varchar
  • string
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What does the MongoDB 'explain' method do?

  • Deletes a document
  • Provides query performance statistics
  • Updates a document
  • Inserts a document
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