MongoDB MCQs – Introduction to MongoDB

The Introduction to MongoDB topic covers the basics of MongoDB, a NoSQL, document-oriented database. It is essential for interviews to understand its architecture, features, and differences from relational databases. This knowledge helps demonstrate expertise in modern database solutions, preparing candidates for back-end development, full-stack development, and data engineering roles.

1.) Who were the founders of the company that developed MongoDB?

A) option1
B) option2 Larry Page and Sergey Brin
C) Steve Jobs, Steve Wozniak, and Ronald Wayne
D) Dwight Merriman, Kevin P. Ryan, and Eliot Horowitz

Answer: Option D

Explanation: Dwight Merriman, Kevin P. Ryan, and Eliot Horowitz
Explanation: MongoDB was created by the founders of 10gen, which later became MongoDB Inc. Dwight Merriman, Kevin P. Ryan, and Eliot Horowitz started the company in 2007. They saw the need for a database that could handle the demands of modern applications, leading to the development of MongoDB.

2.) In which year was MongoDB developed?

A) 2005
B) 2007
C) 2010
D) 2013

Answer: Option B

Explanation: MongoDB was developed in 2007 by 10gen, which later rebranded to MongoDB Inc.

3.) What was the original name of the company that developed MongoDB?

A) 10gen
B) NoSQL Inc.
C) MongoDB Corp.
D) Datastore LLC

Answer: Option A

Explanation: The company that developed MongoDB was originally named 10gen. In 2013, 10gen rebranded itself as MongoDB Inc.

4.) MongoDB is an example of which type of database?

A) Relational
B) Document-oriented
C) Key-Value
D) Graph

Answer: Option B

Explanation: MongoDB is a document-oriented database that stores data in JSON-like format (BSON). Unlike relational databases, it does not store data in tables.

5.) What type of database is MongoDB considered?

A) Relational Database
B) Graph Database
C) NoSQL Database
D) In-Memory Database

Answer: Option C

Explanation: MongoDB is a NoSQL database, designed to handle unstructured data and large-scale data that doesn’t require fixed schemas.

6.) Which of the following is a key feature of MongoDB?

A) High availability and scalability
B) Supports only text data
C) Fixed schema
D) SQL support

Answer: Option A

Explanation: MongoDB offers high scalability and high availability through features like replication and sharding.

7.) What is the default database in MongoDB?

A) admin
B) test
C) default
D) system

Answer: Option B

Explanation: When MongoDB is installed, the default database is test. If no database is specified, MongoDB will use this database.

8.) What is the format used by MongoDB to store data?

A) JSON
B) XML
C) BSON
D) CSV

Answer: Option C

Explanation: MongoDB uses BSON (Binary JSON), a binary format to store data, which extends JSON to support additional data types such as date, binary data, and more.

9.) Which of the following is a valid MongoDB query operator?

A) $like
B) $search
C) $contains
D) $gt

Answer: Option D

Explanation: The $gt operator is used to query documents with values greater than the specified value.

10.) MongoDB uses which of the following as its default index for every document?

A) _name
B) _id
C) _index
D) _key

Answer: Option B

Explanation: Every MongoDB document automatically has an _id field, which is indexed by default.

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