Backend Development Programming Concepts Quiz

1. What does Back End Web Development refer to?

• Writing HTML code for webpage layout.
• Designing user interfaces of websites.
• Building the server-side components of a website.
• Creating images and graphics for websites.

2. Which of the following is NOT a programming language commonly used for Back End Web Development?

• Python
• Java
• HTML
• Ruby

3. What is the role of a back-end developer in a web development team?

• Creating network security firewalls.
• Conducting user experience research.
• Designing user interfaces and graphics.
• Writing code for server-side functionality.

4. What is the purpose of a database in Back End Web Development?

• To store and retrieve data required for the website’s front-end.
• To manage user interface design for the website.
• To create visual animations on web pages.
• To handle marketing strategies for web applications.

5. Which programming language is commonly used for server-side scripting and Back End Web Development?

• PHP
• HTML
• CSS
• Python

6. What does API stand for in the context of Back End Web Development?

• Application Process Interface
• Application Programming Interface
• Automated Programming Integration
• Applied Program Interaction

7. Which of the following is a primary responsibility of Back End Web Development?

• Handling user authentication and data storage
• Designing user interface layouts
• Managing server hardware and infrastructure
• Writing HTML and CSS code

8. What is the role of a web server in Back End Web Development?

• Storing user sessions and preferences on the server.
• Creating and managing the website`s graphical interface.
• Processing user requests for real-time data updates.
• Serving the website’s files and content to users’ browsers.

9. How does Back End Web Development interact with Front End Web Development?

• Back End and Front End work together to create a complete web application, with Back End handling server-side functionality and data, and Front End managing the user interface and interactions.
• Front End is responsible for server-side logic and database interactions while Back End handles user inputs.
• Back End manages the styling and layout of web pages and calls APIs for data.
• Back End only serves static files to the Front End and doesn`t communicate further with it.

10. Which of the following technologies is commonly used for real-time applications and chat applications?

• Ruby
• Python
• Node.js
• Java

11. What is the primary purpose of using a caching mechanism in Back End Web Development?

• To ensure that all user data is permanently stored on the server.
• To encrypt sensitive information for security purposes.
• To create backup copies of all data for disaster recovery.
• To reduce database load and improve performance by storing frequently accessed data in a faster, more accessible location.

12. Which of the following is NOT a common type of database used in Back End Web Development?

• MySQL
• PostgreSQL
• JavaScript
• MongoDB

13. How do back-end developers handle user inputs from forms on a website?

• By automatically emailing the form data to the user.
• By sending the form data to the server for processing and validation.
• By storing the form data in the user`s browser.
• By displaying the form data directly on the web page.

14. What is the difference between synchronous and asynchronous communication in microservices?

• Synchronous communication involves real-time waiting for responses.
• Synchronous communication allows for batch processing of messages later.
• Asynchronous communication is strictly one-way without responses.
• Asynchronous communication waits until data is written to the database.

15. How would you handle data consistency in a distributed system?

• Implement eventual consistency for less critical data.
• Ignore data consistency and prioritize speed.
• Use a single central database for all operations.
• Use only optimistic concurrency control without safeguards.

16. You notice that the backend services are slowing down over time. How would you diagnose and fix the issue?

• Analyze performance metrics and optimize database queries.
• Restart the server to refresh all services.
• Increase the bandwidth to improve speed.
• Limit the number of users accessing the services.

17. What is the difference between SQL and NoSQL databases?

• SQL databases require only basic query languages, while NoSQL uses complex programming languages for data storage.
• SQL databases are non-relational and store data in documents, while NoSQL databases are purely for structured data.
• SQL databases are relational, with structured schemas, and store data in tables, while NoSQL databases are non-relational and can handle unstructured data.
• SQL databases are designed for small sets of data, while NoSQL handles large volume data exclusively.

18. What are the primary layers of security in an application?

• Authentication, Authorization, and Data Encryption
• Server Performance, Network Security, Data Backup
• User Registration, API Testing, Code Review
• User Input Validation, Session Management, Data Backup

19. How do you ensure the security of APIs in Back End Web Development?

• Implement authentication and authorization mechanisms, use HTTPS for secure communication, validate user input, and monitor API usage for potential vulnerabilities.
• Rely solely on client-side validation for security.
• Send all data in plain text without encryption.
• Use only public APIs without restrictions and ignore SSL.

20. What is sharding in database management?

• Sharding is a technique to partition data across multiple servers to improve performance and scalability by distributing the load evenly across multiple nodes.
• Sharding refers to the process of consolidating data into a single storage unit for easier management.
• Sharding is a method of encrypting data both at rest and in transit for security purposes.
• Sharding means creating multiple backups of a single database to prevent data loss.

21. How do you optimize database queries for better performance?

• Increase server memory and CPU power for better performance on all queries.
• Use indexing, optimize query syntax, limit the amount of data retrieved, and use caching mechanisms to reduce the load on the database.
• Write all database queries using only the SELECT statement for efficiency.
• Merge all tables into one to simplify the database schema.

22. What is the role of a content delivery network (CDN) in Back End Web Development?

• A CDN stores and manages user authentication and authorization data.
• A CDN serves static resources globally to reduce latency and improve the loading speed of web pages by distributing content across multiple servers located in different geographic locations.
• A CDN processes server-side logic and handles database queries.
• A CDN is responsible for user interface design and client-side scripting.

23. How do you implement load balancing in a web application?

• Take all incoming traffic to the most powerful server available.
• Use load balancing techniques such as round-robin, least connections, or IP hashing to distribute incoming traffic across multiple servers.
• Simply increase the resources of a single server to handle more traffic.
• Use a single server and cache all data to improve response times.

24. What is the purpose of using profiling tools in Back End Web Development?

• Profiling tools test network security measures and firewalls.
• Profiling tools store user data securely without monitoring.
• Profiling tools help identify performance bottlenecks by analyzing execution times.
• Profiling tools are for designing front-end interfaces on websites.

25. How do you handle server-side errors in a web application?

• Display detailed error messages to users in production.
• Use only console logs to debug the application.
• Use try-catch blocks to catch and handle exceptions, log errors, and return appropriate HTTP status codes.
• Ignore errors and let them happen without handling.

26. What is the difference between threads and processes in a multi-threaded environment?

• A thread can run independently of a process and requires its own memory allocation.
• A process and a thread are the same concepts without any distinction.
• A process is a lightweight execution unit that cannot contain threads.
• A process is an active program being executed, while a thread is a lightweight process that a scheduler can manage independently.

27. Define and explain the nine server response error codes: 200, 201, 204, 301, 400, 401, 404, 409, and 500.

• 201, 201, 204, 301, 400, 403, 404, 401, 500
• 200, 201, 204, 301, 400, 401, 404, 409, 500
• 200, 302, 204, 300, 400, 401, 404, 409, 500
• 200, 201, 200, 301, 401, 404, 405, 409, 500

28. What is the purpose of using automatic failover mechanisms in a distributed system?

• Manage user permissions across systems.
• Increase data storage capacity automatically.
• Ensure high availability during server failures.
• Improve response time on every request.

29. How do you ensure data integrity in a database?

• Implement infinite loops to check data consistency.
• Use ACID-compliant transactions to ensure atomicity and consistency.
• Disable all data validation checks to speed up transactions.
• Store all data in plain text files for easier access.

30. What is the role of a backend developer in ensuring the security of user data?

• Writing user manuals and documentation.
• Designing the marketing strategy.
• Implementing authentication and authorization mechanisms.
• Building user interface components.