MongoDB Online Quiz - Tutorialswebsite

It’s time to test the MongoDB skills after learning all the MongoDB tutorials. This free MongoDB Quiz will help you prepare for the interview with MongoDB.

MongoDB Quiz is not just a test, but a parameter that will measure your knowledge and capabilities, especially for you. So, if you want to check the basics please refer to our MongoDB tutorial series before taking this advanced MongoDB assessment test.

Table of Contents

Results

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#1. The difference between $push and $addToSet is:

$addToSet adds the item to the field only if the new item is of the same datatype

$addToSet needs the fields to be already present while $push will work even if the field is not present

$addToSet adds the item to the field only if it does not exist already; while $push pushes the item to the field irrespective of whether it was present or not

There is no major difference between them. $addToSet is a deprecated version of $push

#2. What does the following MongoDB command return? db.posts.find( { likes : { $gt : 100 }, likes : { $lt : 200 } } );

Posts with likes greater than 100 but less than 200

Posts with likes greater than or equal to 100 but less than or equal to 200

Posts with likes less than 200

Will return syntax error

#3. Which of the following is correct about MongoDB?

MongoDB uses JSON format to represent documents

MongoDB supports collection joins

MongoDB supports some of the SQL functions

MongoDB supports geospatial indexes

#4. You can inspect __________ to check the amount of mapped memory that mongod is using

mem.mapped

memory.resident

mem.resident

all of the mentioned

#5. What does the following query do when performed on the posts collection? db.posts.update({_id:1},{Title:This is post with ID 1″})

Updates the Title of the post

Updating a document is possible only with $set

Replaces the complete document with _id as 1 with the document specified in second parameter

Syntax error

#6. What command will you use to list all available databases?

show dbs

show databases

show db

show alldb

#7. What function do you use to format the query results in mongo shell?

pretty()

format()

print()

#8. With the _______ storage engine, MongoDB uses memory-mapped files to store data.

MMAPv2

MMAPv1

WiredTiger

All of the mentioned

#9. The memory usage statuses metrics of the _________ output can provide insight into MongoDB’s memory use.

globalstats

serverStatus

locks.deadlockCount

all of the mentioned

#10. The _______ operator can be used to identify an element in the array to be updated without explicitly specifying the position of the element.

$elemMatch

$slice

Updating an array field without knowing its index is not possible

#11. What is the output of the following program?

60 s

100 ms

1 s

100 s

#12. What command will you use to display the database you are using?

show db

show all

show databases

#13. Which of the following command inside aggregate command is used in MongoDB aggregation to filter the documents to pass only the documents that match the specified condition(s) to the next pipeline stage.

$group

$match

$aggregate

$sum

#14. Point out the wrong statement.

A single page fault completes slowly and is problematic

Increasing the amount of RAM accessible to MongoDB may help reduce the frequency of page faults

Page faults also can occur while accessing large data sets or scanning an entire collection

None of the mentioned

#15. By default, db.collection.explain() runs in ___________ verbosity mode.

VerbosityMode

queryPlanner

executeStats

none of the mentioned

#16. Point out the correct statement.

Spikes in the number of available connections can also be the result of application or driver errors

For read-heavy applications, increase the size of your replica set and distribute read operations to secondary members

For read-heavy applications, deploy sharding and add one or more shards to a sharded cluster to distribute load among mongod instances

All of the mentioned

#17. Aggregation Pipelines have a limit of:

2 MB document and 100 MB RAM

16 MB document and 100 MB RAM

2 MB document and no limit on RAM

No limit on document and 100 MB RAM

#18. Which of the operator is used to access the query field of documents within system.profile?

$select

$retrieve

$query

None of the mentioned

#19. What is a replica set node which does not maintain its own data but exists only for voting purpose called?

Secondary

Arbiter

Delayed

Hidden

#20. Which of following command will return all items from inventory collection

db.inventory.findAny( )

db.inventory.find()

db.inventory.findAll()

Finish

Pradeep Maurya

Pradeep Maurya is the Professional Web Developer & Designer and the Founder of “Tutorials website”. He lives in Delhi and loves to be a self-dependent person. As an owner, he is trying his best to improve this platform day by day. His passion, dedication and quick decision making ability to stand apart from others. He’s an avid blogger and writes on the publications like Dzone, e27.co