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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 3 of 8

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Q21.
Which of the following will implicitly create the collection testData?

a.

while (var i = 1; i <= 25; i++)
{
db.testData.insert( { x : i } )
}

b.

for (var i = 1; i <= 25; i++)
{
db.testData.insert( { x : i } )
}

c.

for (var i = 1; i <= 25; i++)
{
db.testData.inserts( { x : i } )
}

d.

None of the mentioned

Discuss
Answer: (b).for (var i = 1; i <= 25; i++)
{
db.testData.insert( { x : i } )
}
Q22.
Point out the correct statement.

a.

Collection is a group of MongoDB documents

b.

MongoDB is an open-source document database, and leading NoSQL database

c.

Collections do not enforce a schema

d.

All of the mentioned

Discuss
Answer: (a).Collection is a group of MongoDB documents
Q23.
Which of the following method returns a cursor?

a.

find

b.

sort

c.

skip

d.

all of the mentioned

Discuss
Answer: (a).find
Q24.
Which of the following function is valid for creation of new data inside MongoDB Shell?

a.

function insertData(dbName, colName, num)
{

var col = db.getSiblingDB(dbName).getCollection(colName);

for (i = 0; i < num; i++)
{
col.insertData({x:i});
}

print(col.count());

}

b.

function insertData(dbName, colName, num)
{

var col = db.getSiblingDB(dbName).getCollection(colName);

for (i = 0; i < num; i++)
{
col.insert({x:i});
}

print(col.count());

}

c.

insertData(dbName, colName, num)
{

var col = db.getSiblingDB(dbName).getCollection(colName);

for (i = 0; i < num; i++)
{
col.insert({x:i});
}

print(col.count());

}

d.

None of the mentioned

Discuss
Answer: (b).function insertData(dbName, colName, num)
{

var col = db.getSiblingDB(dbName).getCollection(colName);

for (i = 0; i < num; i++)
{
col.insert({x:i});
}

print(col.count());

}
Q25.
Point out the wrong statement.

a.

Database is a physical container for collections

b.

A single MongoDB server typically has single databases

c.

Collection is the equivalent of an RDBMS table

d.

None of the mentioned

Discuss
Answer: (b).A single MongoDB server typically has single databases
Q26.
_id is a ________ bytes hexadecimal number which assures the uniqueness of every document.

a.

13

b.

16

c.

12

d.

10

Discuss
Answer: (c).12
Q27.
Which of the following statement will insert 400 documents in to the testData collection?

a.

insertData("test", "testData", 200)

b.

insertData("test", "testData", 400)

c.

insertData("test", "testData", 600)

d.

all of the mentioned

Discuss
Answer: (b).insertData("test", "testData", 400)
Q28.
The mongo shell loads and parses the ___________ file on startup.

a.

mongo.js

b.

mongoc.js

c.

mongorc.js

d.

all of the mentioned

Discuss
Answer: (c).mongorc.js
Q29.
To iterate the cursor and return more documents, type _________ in the mongo shell.

a.

cursor

b.

it

c.

next

d.

none of the mentioned

Discuss
Answer: (b).it
Q30.
Which of the following key is used to denote uniqueness in the collection?

a.

_id

b.

id

c.

id_

d.

none of the mentioned

Discuss
Answer: (a)._id
Page 3 of 8

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