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Welcome to the Aggregation Concepts and Aggregation Mechanics MCQs Page

Dive deep into the fascinating world of Aggregation Concepts and Aggregation Mechanics with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Aggregation Concepts and Aggregation Mechanics, a crucial aspect of MongoDB. In this section, you will encounter a diverse range of MCQs that cover various aspects of Aggregation Concepts and Aggregation Mechanics, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within MongoDB.

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Check out the MCQs below to embark on an enriching journey through Aggregation Concepts and Aggregation Mechanics. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of MongoDB.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Aggregation Concepts and Aggregation Mechanics. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Aggregation Concepts and Aggregation Mechanics MCQs | Page 5 of 12

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Q41.
Point out the wrong statement.

a.

Literals can be of any type

b.

CURRENT cannot be rebound

c.

MongoDB parses string literals that start with a dollar sign $

d.

None of the mentioned

Discuss
Answer: (b).CURRENT cannot be rebound
Q42.
______ binds variables for use in the specified expression.

a.

$skip

b.

$let

c.

$bind

d.

None of the mentioned

Discuss
Answer: (b).$let
Q43.
________ applies an expression to each item in an array and returns an array with the applied results.

a.

$map

b.

$geo

c.

$geoRear

d.

None of the mentioned

Discuss
Answer: (a).$map
Q44.
In the vars assignment block, ________ refers to the value of an externally defined variable low.

a.

“$$low”

b.

“$$lowin”

c.

“$$1”

d.

None of the mentioned

Discuss
Answer: (a).“$$low”
Q45.
To avoid treating numeric or boolean literals as projection flags, use the _______ expression to wrap the numeric or boolean literals.

a.

$literal

b.

$bool

c.

$unwin

d.

None of the mentioned

Discuss
Answer: (a).$literal
Q46.
MongoDB treats the literals as projection flags, valid only in the _______ stage.

a.

$project

b.

$gmap

c.

$match

d.

None of the mentioned

Discuss
Answer: (a).$project
Q47.
______ expressions ignores the duplicate entries in each input array and the order of the elements.

a.

set

b.

boolean

c.

aggregate

d.

none of the mentioned

Discuss
Answer: (a).set
Q48.
Point out the correct statement.

a.

To avoid parsing ambiguity if the argument is a literal array, you must wrap the literal array in a $lits expression or keep the outer array that designates the argument list

b.

Expressions cannot include field paths and system variables, literals, expression objects, and expression operators

c.

Operator expressions are similar to functions that take arguments

d.

All of the mentioned

Discuss
Answer: (c).Operator expressions are similar to functions that take arguments
Q49.
________ returns true if the input sets have the same distinct elements.

a.

$setUnion

b.

$setDifference

c.

$setEquals

d.

None of the mentioned

Discuss
Answer: (c).$setEquals
Q50.
Which of the following accepts any number of argument expression?

a.

$setIntersection

b.

$setDifference

c.

$setEquals

d.

None of the mentioned

Discuss
Answer: (a).$setIntersection
Page 5 of 12

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