MongoDB MCQ: MongoDB Multiple Choice Questions and Answers

MongoDB MCQ with answers and explanations for placement tests and job interviews. These solved MongoDB MCQs are useful for the campus placement for all freshers including Engineering Students, MCA students, Computer and IT Engineers, etc.

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MongoDB MCQ: MongoDB Multiple Choice Questions and Answers

1 / 55

Why are ad-hoc queries useful?

They do not have to use the same operators.

You do not need to structure the database to support them.

They autogenerate reports.

They run faster than indexed queries.

2 / 55

How often do the members of a replica set send heartbeats to each other?

every 2 minutes

every 5 seconds

every 2 seconds

every 10 seconds

3 / 55

Given a cursor named myCursor, pointing to the customers collection, how to you get basic info about it?

myCursor.stats()

myCursor.dump()

myCursor.info()

myCursor.explain()

4 / 55

What is true about indexes?

They speed up read access while slowing down writes.

They secure the database from intruders.

They speed up reads and writes.

They speed up write access while slowing down reads.

5 / 55

Given a customer collection which includes fields for gender and city, which aggregate pipeline shows the number of female customers in each city? (Alternative: How can you view the execution performance statistics for a query?)

db.members.aggregate([ {$match: {gender: "Female"}}, {$group: {_id: {city: "$city"}, number: {$sum: 1}}}, {$sort :{number: -1}}])

db.members.find({$match: {gender: "Female"}}, {$group: {\_id: {city: "$city"}, number: {$sum: 1}}}.$sort ({number: -1})

db.members.find([ {$match: {gender: "Female"}}, {$group: {_id: {city: "$city"}, number: {$sum: 1}}}, {$sort :{number: -1}}])

db.members.aggregate([ {$match: {gender: "Female"}}, {$sort :{number: -1}}])

6 / 55

Choose the shell command that connects to a MongoDB database.a

mongo

mongod

mongoconnect

dbconnect

7 / 55

MongoDB ships with a variety of files. Which file runs the MongoDB shell?

mongo

mongo-s

shell

mongo-shell

8 / 55

You have two text fields in your document and you'd like both to be quickly searchable. What should you do?

Create a text index on each field.

MongoDB is not able to do this.

Create a compound text index using both fields.

Create a text index on one field and a single field index on the other.

9 / 55

From the MongoDB shell, how do you create a new document in the customers collection?

db.customers.add({name: "Bob"})

db.customers.save({name: "Bob"})

db.customers.create({name: "Bob"})

db.customers.new({name: "Bob"})

10 / 55

What the primary database in a replica set fails, when does failover begin?

once the primary has been down for 10 minutes

once the primary reboots

immediately

after the administrator reboots the primary

11 / 55

What is the purpose of an arbiter in a replica set?

It monitors replica set and sends email in case of failure

It casts the tie-breaking vote in an election.

It holds a backup copy of the database.

It reboots the failed server.

12 / 55

What is the recommended way to delete a user?

db.deleteUser("user")

db.removeUser("user") DEPRECATED

db.remove("user")

db.dropUser("user")

13 / 55

What is NOT a standard role in MongoDB?

restore

read/write

dbadmin

delete collections

14 / 55

You want to modify an existing index. What is the best way to do this?

Use the reIndex() command to modify the index.

Delete the original index and create a new index.

Call the createIndex() command with the update option.

Use the updateIndex() command.

15 / 55

You need to delete the index you created on the description field. Which command will accomplish this?

db.vehicle.dropIndex("description_text")

db.vehicle.dropIndex({"description":"text"})

db.vehicle.removeIndex({"description":"text"})

db.vehicle.removeIndex("description_text")

16 / 55

In the MongoDB shell, how can you tell if an index was used with a query?

db.customers.find({lastName: 'smith'}).explain()

db.customers.find({lastName: 'smith'}).perf()

db.customers.find({lastName: 'smith'}).plan()

db.customers.find({lastName: 'smith'}).usedIndex()

17 / 55

You'd like a set of documents to be returned in last name, ascending order. Which query will accomplish this?

db.persons.find().sort({lastName: -1}}

db.persons.find().sort({lastName: 1}}

db.persons.find().sort({lastName: ascending}}

db.persons.find().sort({lastName: $asc}}

18 / 55

Given a cursor named myCursor, pointing to the customers collection, how to you get basic info about it?

myCursor.stats()

myCursor.dump()

myCursor.info()

myCursor.explain()

19 / 55

Which MongoDB shell command deletes a single document?

db.customers.delete({_id: 1});

db.customers.drop({_id: 1});

db.drop.customers({_id: 1});

db.customers.remove({_id: 1});

20 / 55

You have just secured your previously unsecured MongoDB server, but the server is still not requiring authentication. What is the best option?

Restart the mongod process.

Issue the secure() command.

Issue the mongoimport command.

Issue the authenticate() command.

21 / 55

What is the preferred format to store geospatial data in MongoDB?

Latitude, longitude

XML

GeoJSON

BSON

22 / 55

Using the MongoDB shell, how do you remove the customer collection and its indexes?

db.customers.remove({}).indexes();

db.customers.remove({});

db.customers.drop();

db.customers.delete();

23 / 55

How do you create a text index?

db.customers.createIndex({firstName, lastName})

db.customers.createTextIndex({firstName, lastName})

db.customers.createIndex({firstName: "text", lastName: "text"})

db.customers.createText({firstName: 1, lastName: 1})

24 / 55

You have a collection named restaurants with the geographical information stored in the location property, how do you create a geospatial index on it?

db.restaurants.CreateIndex({location: "2dsphere"})

db.restaurants.geospatial({location: "2dsphere"})

db.restaurants.CreateIndex("2dsphere":"location")

db.restaurants.CreateIndex({geospatial: "location"})

25 / 55

To cleanly shut down MongoDB, what command should you use from the MongoDB shell?

quit()

exit()

db.shutdownServer()

db.shutdown()

26 / 55

You need to get the names of all the indexes on your current collection. What is the best way to accomplish this?

db.people.getName();

db.people.reIndex({names: 1});

db.people.getIndexKeys();

db.people.getIndexes();

27 / 55

Which command returns all of the documents in the customers collection?

db.customers.all();

db.find().customers();

db.customers.find();

db.customers.show();

28 / 55

To restrict the number of records coming back from a query, which command should you use?

take

limit

max

skip

29 / 55

Suppose your aggregation pipeline terminated with an exception referring to exceeded memory limit. What is the best way to resolve the issue?

Set useMemory to twice amount indicated in exception.

Switch a 64 bit instance of MongoDB.

Increase the memory of the MongoDB server.

Set allowDiskUse to true.

30 / 55

Which programming language is used to write MongoDB queries? (Alternative: In the MongoDB shell, what programming language is used to make queries?)

Python

JavaScript

SQL

TypeScript

31 / 55

A MongoDB instance has at least what three files?

data, namespace, and journal

namespace, journal, and log

journal, data, and database

data, log, and journal

32 / 55

Which MongoDB shell command should you use to back up a database?

restore

backup

mongobackup

mongodump

33 / 55

Which shell query displays all citizens with an age greater than or equal to 21?

db.citizens.select('WHERE age >= 21')

db.citizens.where('age >= 21')

db.citizens.find('WHERE age >= 21')

db.citizens.find({age: {$gte: 21}})

34 / 55

Which query bypasses the first 5 customers and returns the next 10?

db.customers.find({}, {skip: 5, limit: 10})

db.customers.find({}.page(5).take(10))

db.customers.find({}).skip(5).take(10)

db.customers.find({}).skip(5).limit(10)

35 / 55

By default, applications direct their read operations to which member of the replica set?

primary

arbiter

secondary

backup

36 / 55

What does a MongoDB collection consist of?

data

documents

fields

rows

37 / 55

In an MongoDB mapReduce command, the reduce function should ____.

access the database

be called only when the key has a single value

access the database only to perform read operations

not access the data

38 / 55

How do you find documents with a matching item in an embedded array?

db.customers.findmatch ({"jobs":"secretary"})

db.customers.find ({"jobs:secretary"})

db.customers.find ({"jobs":["secretary"]})

db.customers.find ({"jobs":"secretary"})

39 / 55

You would like to know how many different categories you have. Which query will best get the job done?

db.vehicle.distinct("category")

db.vehicle.unique("category")

db.vehicle.distinct("category").count()

db.vehicle.distinct("category").length

40 / 55

Which command returns a specific document in the user's collection?

db.users.find({_id: 1})

db.users.seek({_id: 1})

db.users.query({_id: 1})

db.query.users({_id: 1})

41 / 55

Which command adds members to the replica set from MongoDB shell?

rs.add("<hostname>")

replicaSetAdd("<hostname>")

rs.insert("<hostname>")

replica.add("<hostname>")

42 / 55

What is the correct query to find all of the people who have a home phone number defined?

db.person.find({exists: 'homePhone'});

db.person.exists({homePhone: true});

db.person.find({homePhone: {$exists: true}});

db.person.has('homePhone');

43 / 55

You have a collection of thousands of students. You'd like to return the second set of 20 documents from the sorted collection. What is the proper order in which to apply the operations?

limit, skip, sort

sort, limit, skip

limit, sort, skip

sort, skip, limit

44 / 55

You want to know how many types of items you have in each category. Which query does this?

db.product.group({_id: "$category", count: {$sum:1}})

db.product.aggregate($sum: {_id: "$category", count: {$group:1}})

db.product.aggregate($group: {_id: "$category", count: {$sum:1}})

db.product.aggregate($count: {_id: "$category", count: {$group:1}})

45 / 55

To import a CSV file into MongoDB, which command should you issue?

mongorestore

mongoi

upload

mongoimport

46 / 55

To import a JSON array into Mongo, what flags are needed with MongoDBimport?

--type jsonArray

--json

--type json

--jsonArray

47 / 55

Given a cursor named myCursor, which command returns a boolean value?

myCursor.hasNext()

myCursor.sort()

myCursor.next()

myCursor.find()

48 / 55

A compound index allows you to ___ ?

Calculate interest quickly.

Accomplish nothing, since compound indexes aren't allowed in Mongo.

Use more than one field per index.

Combine fields in different collations.

49 / 55

You would like the stats() command to return kilobytes instead of bytes. Which command should you run?

db.vehicle.stats(1024)

db.vehicle.stats("kilobytes")

db.vehicle.stats(true)

db.vehicle.stats("kb")

50 / 55

One of the documents in your collection has an _id based upon an older database design and you want to change it. You write an update command to find the document and replace the _id but the _id isn't changed. How should you fix the issue?

Set the replace option to true.

Use the replaceOne() command instead.

You can't. Once set, the _id field cannot be changed.

Use the updateOne() command instead.

51 / 55

What is the correct option to set up Kerberos when starting MongoDBd?

--setParameter authenticationMechanisms=GSSAPI

--setAuthentication=GSSAPI

--setParam auth=K

--setAuth method=Kerberos

52 / 55

Which field is required of all MongoDB documents?

_id

_name

ObjectId

mongoDB is schema-less so no field is required

53 / 55

Given an ObjectId in _id, how do you get the time it was created?

getDateTime(_id)

_id.createDate()

_id.getTimestamp()

_id.getDateTime()

54 / 55

On a newly created collection, which field will have an index?

the name field

the ObjectId field

the _id field

no field will have an index

55 / 55

You are going to do a series of updates to multiple records. You find setting the multi option of the update() command too tiresome. What should you do instead?

Use the replaceMany() command instead

Use the updateMulti() command instead

Use the updateMany() command instead

Set the global multi option to True

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MongoDB MCQ: MongoDB Multiple Choice Questions and Answers

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