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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 4 of 12

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Q31.
________ passes the first n documents unmodified to the pipeline where n is the specified limit.

a.

$skip

b.

$limit

c.

$match

d.

$redact

Discuss
Answer: (b).$limit
Q32.
_______ reorders the document stream by a specified sort key.

a.

$skip

b.

$limit

c.

$sort

d.

None of the mentioned

Discuss
Answer: (c).$sort
Q33.
Which of the following operator incorporates the functionality of $match, $sort, and $limit for geospatial data?

a.

$geoSpatial

b.

$geoNear

c.

$geoRear

d.

None of the mentioned

Discuss
Answer: (b).$geoNear
Q34.
_____ Writes the resulting documents of the aggregation pipeline to a collection.

a.

$out

b.

$in

c.

$output

d.

None of the mentioned

Discuss
Answer: (a).$out
Q35.
________ deconstructs an array field from the input documents to output a document for each element.

a.

$unwindelem

b.

$unwind

c.

$unwin

d.

None of the mentioned

Discuss
Answer: (c).$unwin
Q36.
Which of the following operator is related to geography of data?

a.

$geoSpatial

b.

$geoNear

c.

$geoRear

d.

None of the mentioned

Discuss
Answer: (b).$geoNear
Q37.
Which of the following stages cannot appear multiple times in a pipeline?

a.

$regex

b.

$reg

c.

$match

d.

$out

Discuss
Answer: (c).$match
Q38.
Point out the correct statement.

a.

To access variables in expressions, use a string that prefixes the variable name with $$$

b.

Expressions can include field paths and system variables, literals, expression objects, and expression operators

c.

To specify a field path, use a string that prefixes with a dollar sign % the field name or the dotted field name

d.

All of the mentioned

Discuss
Answer: (b).Expressions can include field paths and system variables, literals, expression objects, and expression operators
Q39.
Aggregation expressions use ______ path to access fields in the input documents.

a.

mpath

b.

dbpath

c.

lpath

d.

field

Discuss
Answer: (d).field
Q40.
Which of the following statement is equivalent to “$$CURRENT.<field>”?

a.

“$%<field>”

b.

“%<field>”

c.

“$$<field>”

d.

“$<field>”

Discuss
Answer: (d).“$<field>”
Page 4 of 12

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