Master MongoDB Basics: Essential Questions for Interviews

Prepare for your MongoDB interview with these 10 essential questions covering core concepts, commands, and features. Strengthen your understanding of NoSQL basics with supported explanations for each answer!

Question 1.

What is MongoDB?

  • A.

    A relational database management system

  • B.

    A NoSQL database designed for scalability and flexibility

  • C.

    A programming language

  • D.

    A caching tool

Question 2.

How does MongoDB store data?

  • A.

    Tables and rows

  • B.

    XML files

  • C.

    Key-value pairs

  • D.

    Documents and collections

Question 3.

Which data format does MongoDB use to store documents?

  • A.

    JSON

  • B.

    BSON

  • C.

    XML

  • D.

    YAML

Question 4.

What is the default port for MongoDB?

  • A.

    27015

  • B.

    3306

  • C.

    27017

  • D.

    8080

Question 5.

How do you insert a document into a MongoDB collection?

  • A.

    db.collection.push()

  • B.

    db.collection.insert()

  • C.

    db.collection.add()

  • D.

    db.collection.save()

Question 6.

Which command is used to find documents in a collection?

  • A.

    db.collection.find()

  • B.

    db.collection.search()

  • C.

    db.collection.get()

  • D.

    db.collection.fetch()

Question 7.

What is the purpose of an index in MongoDB?

  • A.

    To compress data

  • B.

    To speed up read operations

  • C.

    To restrict document access

  • D.

    To enforce schema

Question 8.

Which of the following is not a valid MongoDB data type?

  • A.

    String

  • B.

    Integer

  • C.

    Array

  • D.

    Float

Question 9.

What does the aggregation framework in MongoDB do?

  • A.

    Deletes documents in bulk

  • B.

    Performs advanced data processing and transformation

  • C.

    Updates multiple documents

  • D.

    Creates indexes

Question 10.

How does MongoDB handle relationships between data?

  • A.

    Using Foreign Keys

  • B.

    Using Joins like SQL

  • C.

    Using Embedded Documents and References

  • D.

    Using Temporary Tables