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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 9 of 12

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Q81.
Which of the following function follows the reduce method and modifies the output?

a.

finalize

b.

final

c.

max

d.

all of the mentioned

Discuss
Answer: (a).finalize
Q82.
__________ specifies global variables that are accessible in the map.

a.

jsMode

b.

scope

c.

finalize

d.

Min

Discuss
Answer: (b).scope
Q83.
MongoDB converts the JavaScript objects emitted by the map function to ________ objects.

a.

BSON

b.

JSON

c.

Javascript

d.

None of the mentioned

Discuss
Answer: (a).BSON
Q84.
You can only use jsMode for result sets with fewer than 500,000 distinct key arguments to the mapper’s _______ function.

a.

emit()

b.

emitter()

c.

emitted()

d.

none of the mentioned

Discuss
Answer: (a).emit()
Q85.
Which of the following mode defaults to false?

a.

jsMode

b.

scope

c.

finalize

d.

min

Discuss
Answer: (a).jsMode
Q86.
$dayOfMonth returns the day of the month for a date as a number between ________________

a.

1 and 31

b.

1 and 30

c.

1 and 28

d.

None of the mentioned

Discuss
Answer: (a).1 and 31
Q87.
Point out the wrong statement.

a.

$second returns the seconds for a date as a number between 0 and 60 (leap seconds)

b.

$minute returns the minute for a date as a number between 0 and 59

c.

$millis returns the milliseconds of a date as a number between 0 and 1000

d.

All of the mentioned

Discuss
Answer: (c).$millis returns the milliseconds of a date as a number between 0 and 1000
Q88.
__________ returns the day of the year for a date as a number between 1 and 366.

a.

$dayofWeekend

b.

$dayOfWeek

c.

$dayOfYear

d.

None of the mentioned

Discuss
Answer: (c).$dayOfYear
Q89.
Which of the following returns year for particular date?

a.

$year

b.

$yearday

c.

$syearofmonth

d.

None of the mentioned

Discuss
Answer: (a).$year
Q90.
Point out the wrong statement.

a.

$weekDay returns the week number for a date as a number between 0 and 53 (leap year)

b.

$cond accepts either two expressions in an ordered list or three named parameters

c.

$toLower only has a well-defined behavior for strings of ASCII characters

d.

None of the mentioned

Discuss
Answer: (b).$cond accepts either two expressions in an ordered list or three named parameters
Page 9 of 12

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