Question 1

Which of the following collections stores authentication credentials in MongoDB?

Options :

A : test.users

B : local.users

C : system.users

D : users.users

Answer: C

Question 2

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

Options :

A : mongodump

B : mongostat

C : mongoimport

D : mongoexport

Answer: C,D

Question 3

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

Options :

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

B : Number of posts by an author

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

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

Answer: D

Question 4

You have a replicated cluster with 1 primary, 3 secondary, 1 arbiter. One of the secondary is hidden. What is the replication factor of this replicated cluster?

Options :

A : 7

B : 03

C : 04

D : 06

Answer: C

Question 5

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?

Options :

A : upsert command instead of update command

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

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

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

Answer: D