MongoDB and MERN Stack Quiz

What is MongoDB, and why is it used in the MERN stack?

• MongoDB is a relational database management system that uses tables to store data, making it ideal for structured data and complex queries in the MERN stack.

• MongoDB is a cloud-based service that automatically scales web applications, providing high availability and redundancy in the MERN stack.

• MongoDB is a NoSQL database that stores data in a flexible, JSON-like document format, allowing for easy scalability and handling of unstructured data in the MERN stack.

• MongoDB is an in-memory data store that accelerates the performance of frontend applications by caching frequently accessed data in the MERN stack.

Can you explain what a document is in MongoDB?

• A document is a piece of code that runs on the server.

• A document is a record in a database, like a page in a notebook.

• A document is a type of web page created with HTML.

• A document is a command used to interact with the server.

What is the difference between a collection and a document in MongoDB?

• A collection is a type of programming language, and a document is a library.

• A document stores multiple collections.

• A collection is a group of documents, while a document is a single record.

• A document is a type of database, and a collection is a programming language.

Why do we use NoSQL databases like MongoDB instead of SQL databases in some cases?

• NoSQL databases are cheaper to use.

• NoSQL databases are more flexible and can handle unstructured data.

• NoSQL databases are faster than SQL databases.

• NoSQL databases are only used for large-scale applications.

How do you store data in MongoDB, and what format does it use?

• Data is stored in tables using SQL format.

• Data is stored in rows and columns using CSV format.

• Data is stored in documents using JSON format.

• Data is stored in XML files.

What is a primary key in MongoDB, and how is it different from SQL databases?

• A primary key is a programming function used in MongoDB.

• A primary key is a unique identifier for each document, automatically created in MongoDB.

• A primary key is a special query used in SQL databases.

• A primary key is a type of data stored in MongoDB.

Can you explain what a schema is in MongoDB?

• A schema is a blueprint or plan that describes the structure of documents.

• A schema is a type of document stored in MongoDB.

• A schema is a command used to create a database.

• A schema is a tool used for data analysis.

How does MongoDB handle relationships between data?

• By using references or embedding documents inside one another.

• By storing data in tables with foreign keys.

• By creating multiple databases for related data.

• By linking collections together directly.

What is Express.js, and why is it used in the MERN stack?

• It's a frontend framework for building user interfaces.

• It's a database management system.

• It's a framework that simplifies building web servers and handling requests.

• It's a tool for designing database schemas.

How does Express.js help in building web applications?

• It provides pre-built templates for web pages.

• It offers tools and features for creating and managing web servers.

• It's used for designing the frontend of web applications.

• It helps in managing the database connections.