MCQs

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Overall MCQs for Reference

Which command is used to start the MongoDB Shell?
a. mongo
b. mongod
c. mongosh
d. mongos
Answer: a. mongosanfoundry+1
What language does the MongoDB Shell use for its command syntax?
a. Python
b. Bash
c. JavaScript
d. SQL
Answer: c. JavaScriptinterviewbit
Which command lists all databases available in MongoDB Shell?
a. show collections
b. show databases
c. show dbs
d. list dbs
Answer: c. show dbsscribd+1
What is the default database when starting a new shell session?
a. mongo
b. admin
c. users
d. test
Answer: d. testgtu-mcq+1
What does the db command return in the shell?
a. Database version
b. Current database
c. List of collections
d. Host information
Answer: b. Current databasesanfoundry+1
How do you switch to a database named “analytics” in the shell?
a. use analytics
b. db.analytics()
c. switch analytics
d. db.use(‘analytics’)
Answer: a. use analyticssanfoundry+1
Which command shows all collections in the current database?
a. list collections
b. show collections
c. db.show()
d. collections show
Answer: b. show collectionssanfoundry+1
How do you insert a document into a collection in the shell?
a. db.collection.insertOne(document)
b. db.insert(document)
c. insert document db.collection
d. db.collection.add(document)
Answer: a. db.collection.insertOne(document)placementpreparationyoutube
Which command is used to retrieve all documents from a collection?
a. db.collection.select(*)
b. db.collection.find()
c. db.collection.getAll()
d. db.collection.fetchAll()
Answer: b. db.collection.find()youtubeplacementpreparation
How do you limit the number of results returned from a query?
a. db.collection.limit(N)
b. db.collection.find().limit(N)
c. db.collection.find(N)
d. db.collection.take(N)
Answer: b. db.collection.find().limit(N)placementpreparation+1
Which operator is used in MongoDB Shell for greater than comparisons?
a. $above
b. $gt
c. $greater
d. $more
Answer: b. $gtgeeksforgeeks+1
Which operator is used for filtering documents with multiple criteria (AND) in find()?
a. $or
b. $not
c. $and
d. $nor
Answer: c. $andgeeksforgeeks+1
What does db.collection.updateOne() do?
a. Updates all documents
b. Updates one matching document
c. Deletes a document
d. Creates a collection
Answer: b. Updates one matching documentsanfoundry+1
Which command removes all documents from a collection?
a. db.collection.removeAll()
b. db.collection.erase()
c. db.collection.remove({})
d. db.collection.drop()
Answer: c. db.collection.remove({})placementpreparation+1
What does db.collection.drop() do?
a. Deletes all documents
b. Drops the entire collection
c. Updates collection
d. Backs up collection
Answer: b. Drops the entire collectionyoutube
How do you update a specific field in all matching documents?
a. db.collection.updateAll({$set: {}})
b. db.collection.update({}, {$set: {…}}, {multi: true})
c. db.collection.modifyAll({})
d. db.collection.updateMany({})
Answer: d. db.collection.updateMany({})geeksforgeeks+1
Which aggregation stage is used to group documents?
a. $match
b. $group
c. $sort
d. $set
Answer: b. $groupscribd+1
What does the $project stage do in an aggregation pipeline?
a. Filters documents
b. Projects specified fields
c. Groups documents
d. Updates documents
Answer: b. Projects specified fieldsscribd+1
How do you remove a field from a document in the shell?
a. $unset
b. $remove
c. $pull
d. $delete
Answer: a. $unsetplacementpreparation+1
Which MongoDB Shell command provides database statistics?
a. db.stats()
b. db.status()
c. show stats
d. stats()
Answer: a. db.stats()scribd+1
How do you create an index on a field in the shell?
a. db.collection.createIndex({field: 1})
b. db.createIndex(field)
c. createIndex db.collection(field)
d. db.collection.addIndex(field)
Answer: a. db.collection.createIndex({field: 1})sanfoundry+1
What does db.collection.findOne() do?
a. Finds one random document
b. Finds and returns the first matching document
c. Finds all documents
d. Counts documents
Answer: b. Finds and returns the first matching documentsanfoundry+1
Which operator will match values within a specified range?
a. $between
b. $in
c. $range
d. $gt and $lt
Answer: d. $gt and $ltgeeksforgeeks+1
Which shell command shows user roles in the database?
a. show users
b. db.getUsers()
c. show roles
d. db.users.roles()
Answer: b. db.getUsers()sanfoundry
How can you export data from a collection using the shell?
a. db.collection.export()
b. mongoexport
c. db.export()
d. mongo shell export
Answer: b. mongoexportplacementpreparation+1
How do you import data in JSON format to the database?
a. db.collection.importJson()
b. mongoimport
c. db.import()
d. importmongo
Answer: b. mongoimportplacementpreparation+1
What is the use of the $regex operator?
a. Join two collections
b. Pattern matching in queries
c. Create regular intervals
d. Sort documents
Answer: b. Pattern matching in queriessanfoundry+1
Which shell command lists all indexes for a collection?
a. db.collection.showIndexes()
b. db.collection.listIndexes()
c. db.collection.getIndexes()
d. db.collection.indexes()
Answer: b. db.collection.listIndexes()sanfoundry
What does db.collection.countDocuments() return?
a. All documents
b. Number of matching documents
c. Sum of fields
d. Field values
Answer: b. Number of matching documentsplacementpreparation+1
How do you check the current user in the MongoDB Shell?
a. whoami
b. db.runCommand({connectionStatus: 1})
c. db.user()
d. currentUser()
Answer: b. db.runCommand({connectionStatus: 1})sanfoundry
Which operator is used to increment a field value?
a. $inc
b. $add
c. $sum
d. $plus
Answer: a. $incgeeksforgeeks+1
What is the function of db.collection.distinct(field)?
a. Returns distinct field values
b. Returns unique documents
c. Groups documents
d. Project fields
Answer: a. Returns distinct field valuessanfoundry
Which command in the shell starts a transaction?
a. startTransaction
b. session.startTransaction()
c. beginTransaction
d. db.transaction.start()
Answer: b. session.startTransaction()sanfoundry
How do you end a transaction in the shell?
a. endTransaction
b. session.commitTransaction()
c. commit
d. commitTransaction()
Answer: b. session.commitTransaction()sanfoundry
What does db.collection.aggregate([]) do?
a. Updates all documents
b. Runs aggregation pipeline
c. Drops the collection
d. Imports documents
Answer: b. Runs aggregation pipelinescribd+1
Which command creates a capped collection?
a. db.createCappedCollection()
b. db.createCollection(‘name’, {capped: true, size: 1024})
c. db.makeCapped(‘name’)
d. createCapped(‘name’)
Answer: b. db.createCollection(‘name’, {capped: true, size: 1024})sanfoundry
What command would you use to exit the shell?
a. quit()
b. exit
c. bye()
d. end()
Answer: a. quit()placementpreparation+1
Which command checks for the existence of a document?
a. db.collection.has()
b. db.collection.findOne()
c. db.collection.exists()
d. db.collection.check()
Answer: b. db.collection.findOne()placementpreparation+1
How do you update multiple fields within a document?
a. db.collection.updateOne({}, {fields: {}})
b. db.collection.updateOne({}, {$set: {field1: value1, field2: value2}})
c. db.collection.set()
d. db.collection.updateAllFields()
Answer: b. db.collection.updateOne({}, {$set: {field1: value1, field2: value2}})sanfoundry
Which MongoDB Shell method is used for data aggregation, filtering, and transformation?
a. aggregate()
b. groupby()
c. summarize()
d. filter()
Answer: a. aggregate()scribd+1
What is the function of the $match stage in aggregation?
a. Joins collections
b. Filters documents
c. Adds fields
d. Groups documents
Answer: b. Filters documentsscribd+1
Which command can check the size of a collection?
a. db.collection.size()
b. db.collection.stats()
c. db.collection.getSize()
d. db.size(‘collection’)
Answer: b. db.collection.stats()scribd+1
How do you upsert in MongoDB Shell?
a. update() with upsert: true option
b. insertOrUpdate()
c. upsert()
d. addOrUpdate()
Answer: a. update() with upsert: true optionplacementpreparation+1
What does db.getSiblingDB(‘database_name’) do?
a. Returns sibling documents
b. Switches context to another database
c. Exports database
d. Gets parent database
Answer: b. Switches context to another databasesanfoundry
Which command returns an array of all collection names in the current database?
a. db.collections()
b. db.getCollectionNames()
c. show all collections
d. db.collectionNames()
Answer: b. db.getCollectionNames()sanfoundry
In the shell, how are comments added in a script?
a. #
b. //
c. —
d. %%
Answer: b. //sanfoundry
Which command executes a JavaScript file in shell?
a. exec(‘file.js’)
b. .load(‘file.js’)
c. source file.js
d. run(‘file.js’)
Answer: b. .load(‘file.js’)sanfoundry
How do you rename a collection in the shell?
a. db.collection.rename(‘newName’)
b. db.renameCollection(‘oldName’, ‘newName’)
c. db.collection.renameCollection(‘newName’)
d. db.rename(‘newName’)
Answer: a. db.collection.rename(‘newName’)sanfoundry
What operator checks if a field exists in a document?
a. $exist
b. $field
c. $exists
d. $present
Answer: c. $existssanfoundry
Which command returns the version of the MongoDB server?
a. db.version()
b. server.version()
c. version()
d. db.runCommand({buildInfo: 1})
Answer: d. db.runCommand({buildInfo: 1})interviewbit+1

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