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NO.17 You are comparing values of different BSON types in mongodb. You want to compare from lowest to highest.
Which comparison order is used?

 MinKey, Null, Numbers,Symbol, String,Object,Array,BinData

 MinKey, Null, Numbers,Object,Array,BinData,Symbol, String

 Object/Array^inData/Symbol,MinKey, Null, Numbers,String

 Objec^Array^inData,Symbol, String,MinKey, Null, Numbers

NO.18 Which of the following operator can be used to control the number of items of an array that a query returns?

 $ elemMatch

 $slice

 $

 MongoDB does not support partial retrieval of items from an array

NO.19 Suposse tou have the following collection with only 2 documents:

If you run an aggregation query and use { $unwind: “$traits” } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?

 3

 5

 4

 2

 1

NO.20 ‘mongoimport’ command is used for

 Batch data insertion

 None of the above

 Multiple command import

 Multiple command insertion

NO.21 As per the aggregation pipeline optimization concepts, if you have a $sort followed by a $match:

 Providing these parameters in any order does not impact the performance

 $sort moves before $match

 MongoDB does not do any movements by default and will use the order provided

 $match moves before $sort

NO.22 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?

 upsert command instead of update command

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

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

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

NO.23 You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?

 A document will be inserted with the same _id as the last document inserted

 A document that matches the collection’s existing schema, but with null fields

 A document with an _id assigned to be an Objectld

 An empty document

 No document will be inserted; an error will be raised

NO.24 Consider the following document:
> db.c.find()
{ “_id” : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] }
Which of the following queries on the “c” collection will return only the first five elements of the array in the
“b”
field? E.g.,
Document you want returned by your query:
{ “_id” : 12, “b” : [ 3, 5, 7, 2, 1 ] >

 db.c.find( { > , { b : { $slice : [ 0 , 5 ] } } )

 db.c.find( { b : [ 0 , 5 ] > )

 db.c.find( { > , { b : { $substr[ 0 , 5 ] > > )

 db.c.find( { > , { b : [ 0, 1, 2, 3, 4, 5 ] > )

 db.c.find( { > , { b : [ 0 , 5 ] > )

NO.25 What is the output of the following program?

 60 s

 1s

 100 s

 100 ms

NO.26 Below is a sample document of “orders” collection

$sort

NO.27 What is the first task that a secondary would perform on being prompted by another secondary for an election?

 Start the election process for primary

 Vote for the first secondary so that it would become the next primary

 Vote for itself and then call for election

 Connect to primary to confirm its availability

NO.28 Which of the following operator can be used to limit the number of documents in an array field of a document after an update is performed?

 $arrayLimit

 $push along with $each, $sort and $slice

 $removeFromSet

 None of the above

NO.29 Which of the following is true of the mechanics of replication in MongoDB? Check all that apply.

 Members of a replica set may replicate data from any other data-bearing member of the set by default

 Clients read from the nearest member of a replica ser by default

 Operations on the primary are recorded in a capped collection called the oplog

NO.30 Consider the following document from the products collection:

What does the following query using $elemMatch return? db.products.find( { product_code: “345678” }, { variations: { $elemMatch: { size: ^L^ } } } )

 Returns the complete document but retrieves only the size field from the array

 Returns the document but with only one element in the variations array (corresponding to size L)

 Returns the complete document since MongoDB does not support partial array retrieval

 Returns the complete document but retrieves only the size field from the array and also with only one element in the variations array (corresponding to size L)

NO.31 Consider the following posts document:

Which of the following queries will return the documents but with only the first two tags in the tags array?

 db.posts.find({author:”Tom”}.limit({tags:2})

 db.posts.find({author:”Tom”}.limit($slice:{tags:2>)

 Both “db.posts.find({author:”Tom”},{tags:{$slice:2}})” and
“db.posts.find({author:”Tom”}).limit($slice: {tags:2})” are valid. $slice works both with projection and limit.

 db.posts.find({author:”Tom”>,{tags:{$slice:2})

NO.32 Which of the following node is used during election in a replication cluster?

 primary

 arbiter

 hidden

 secondary

NO.33 Which of the following is true about sharding?

 Creating a sharded key automatically creates an index on the collection using that key

 We cannot change a shard key directly/automatically once it is set up

 A sharded environment does not support sorting functionality since the documents lie on various mongod instances

 Sharding is enabled at the database level

NO.34 What does the following $slice query return using the following command? db.posts.find( {}, { comments: {
$slice: [ -10, 5 ] } } )

 Returns 5 comments, beginning with the last 10 items

 Returns 10 comments, beginning with the last

 Returns 10 comments, beginning with the first

 Returns 5 comments, beginning with the first 10 items

NO.35 What is the output of following two commands in MongoDB: db. posts. insert({n_id”:l}) db.posts.insert({“_id”:l})

 Two documents will be inserted with _id as 1

 MongoDB will automatically increment the _id of the second document as 2

 This will throw a duplicate key error

 It will insert two documents and throw a warning to the user

NO.36 Which of the following is correct about MongoDB?

 MongoDB supports geospatial indexes

 MongoDB supports some of the SQL functions

 MongoDB uses JSON format to represent documents

 MongoDB supports collection joins

NO.37 You are in a sharded cluster. What will you do prior to initiating backup in sharded cluster?

 db.stopBalancer()

 db.stopserver()

 sh.stopBalancer()

 sh.stopserverQ

NO.38 MongoDB is a schema-less design.

 False

 True

NO.39 In what format does mongodump creates backup files?

 BSON

 JSON

 SOAP

 XML

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