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Welcome to the MongoDB CRUD Operations MCQs Page

Dive deep into the fascinating world of MongoDB CRUD Operations with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of MongoDB CRUD Operations, a crucial aspect of MongoDB. In this section, you will encounter a diverse range of MCQs that cover various aspects of MongoDB CRUD Operations, 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 MongoDB CRUD Operations. 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 MongoDB CRUD Operations. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

MongoDB CRUD Operations MCQs | Page 8 of 8

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Q71.
Indexes are typically available in ______ or located sequentially on disk.

a.

RAM

b.

ROM

c.

CMOS

d.

None of the mentioned

Discuss
Answer: (a).RAM
Q72.
Point out the wrong statement.

a.

Query selectivity refers to how well the query predicate excludes or filters out documents in a collection

b.

Query selectivity can determine whether or not queries can use indexes effectively or even use indexes at all

c.

More selective queries match a larger percentage of documents

d.

All of the mentioned

Discuss
Answer: (c).More selective queries match a larger percentage of documents
Q73.
___________ is used to determine whether a query is a covered query.

a.

explainstats()

b.

explain()

c.

explainall()

d.

all of the mentioned

Discuss
Answer: (b).explain()
Q74.
The ________ message is used to update a document in a collection.

a.

UPDATE

b.

OP_UPDATE

c.

OP_UPDATES

d.

All of the mentioned

Discuss
Answer: (b).OP_UPDATE
Q75.
Point out the correct statement.

a.

An equality match on the unique _id field is less selective as it can match at most one document

b.

The selectivity of regular expressions depends on the expressions themselves

c.

Less selective queries can use indexes effectively or even at all

d.

All of the mentioned

Discuss
Answer: (b).The selectivity of regular expressions depends on the expressions themselves
Q76.
_____ can modify specific fields of an existing document or documents or replace an existing document entirely, depending on the update parameter.

a.

modify()

b.

update()

c.

find()

d.

none of the mentioned

Discuss
Answer: (b).update()
Q77.
The update() method uses the _______ command, which uses the default write concern.

a.

find

b.

read

c.

update

d.

modify

Discuss
Answer: (c).update
Q78.
_________ is used to view statistics about the query plan for a given query.

a.

db.explain()

b.

cursor.explain()

c.

cursor.explainstats()

d.

all of the mentioned

Discuss
Answer: (b).cursor.explain()
Q79.
A ________ query plan has returned a threshold number of matching results.

a.

execution

b.

unordered

c.

ordered

d.

none of the mentioned

Discuss
Answer: (c).ordered
Q80.
A query _______ consists of a combination of query, sort, and projection specifications.

a.

plan

b.

shape

c.

stats

d.

all of the mentioned

Discuss
Answer: (b).shape
Page 8 of 8

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