Free MongoDB C100DBA Exam Questions

Become MongoDB Certified with updated C100DBA exam questions and correct answers

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Total 134 Questions | Updated On: Jan 29, 2026

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Question 1

Which of the following collections stores authentication credentials in MongoDB?

A : t.users

B : cal.users

C : tem.users

D : ers.users

Answer: C

Question 2

What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ { $group: { _id; '$author', x: { $sum: $likes } } } ] )

A : erage of likes on all the posts of an author, grouped by author

B : mber of posts by an author

C : m of likes on all the posts by all the authors

D : m of likes on all the posts by an author, grouped by author

Answer: D

Question 3

By default, the MongoDB cursor in mongo shell is configured to return how many documents? To get the next set of documents, which command is used?

A : 200, more

B : limit, none

C : 20, it

D : 50, it

Answer: C

Question 4

Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?

A : ert command instead of update command

B : is has to be handled in application code (Node.js, PHP, JAVA, C#, etc.) and cannot be handled in mongo shell query

C : {update: true, insert: true} as the third parameter of update command

D : ecify {upsert : true } as the third parameter of update command

Answer: D

Question 5

Which mongodb tools allow us to work with our data in a human readable format?

A : ngodump

B : ngostat

C : ngoimport

D : ngoexport

Answer: C,D

Page: 1 / 27

Total 134 Questions | Updated On: Jan 29, 2026

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