Python FastAPI Basics MCQ Questions with Answers (Latest 2026)

Q1. Which option best describes FastAPI in Python?

A. A pure ORM. B. A pure template engine. C. Modern async Python web framework based on Starlette and Pydantic. D. A messaging broker.

Select an answer to check.

Answer: Modern async Python web framework based on Starlette and Pydantic.

Here, Modern async Python web framework based on Starlette and Pydantic. is the right choice. ASGI-based with type hints. It aligns directly with what the question asks about which option best describes fastapi in python. A quick elimination of partially true options helps confirm it.

Q2. What is the primary purpose of FastAPI?

A. A pure template engine. B. A messaging broker. C. A pure ORM. D. Modern async Python web framework based on Starlette and Pydantic.

Select an answer to check.

Answer: Modern async Python web framework based on Starlette and Pydantic.

In this case, Modern async Python web framework based on Starlette and Pydantic. is correct. ASGI-based with type hints. It aligns directly with what the question asks about what is the primary purpose of fastapi. A quick elimination of partially true options helps confirm it.

Q3. Which statement about FastAPI is most accurate?

A. A pure ORM. B. A pure template engine. C. A messaging broker. D. Modern async Python web framework based on Starlette and Pydantic.

Select an answer to check.

Answer: Modern async Python web framework based on Starlette and Pydantic.

The best option here is Modern async Python web framework based on Starlette and Pydantic.. ASGI-based with type hints. It aligns directly with what the question asks about which statement about fastapi is most accurate. A quick elimination of partially true options helps confirm it.

Q4. How is FastAPI best characterized?

A. A messaging broker. B. Modern async Python web framework based on Starlette and Pydantic. C. A pure ORM. D. A pure template engine.

Select an answer to check.

Answer: Modern async Python web framework based on Starlette and Pydantic.

For this question, Modern async Python web framework based on Starlette and Pydantic. is correct. ASGI-based with type hints. It aligns directly with what the question asks about how is fastapi best characterized. A quick elimination of partially true options helps confirm it.

Q5. Which option best describes ASGI in Python?

A. HTTP/3 protocol only. B. WSGI for sync apps only. C. A web server. D. Asynchronous Server Gateway Interface.

Select an answer to check.

Answer: Asynchronous Server Gateway Interface.

Asynchronous Server Gateway Interface. is the correct answer here. Supports websockets and async. It aligns directly with what the question asks about which option best describes asgi in python. A quick elimination of partially true options helps confirm it.

Q6. What is the primary purpose of ASGI?

A. A web server. B. WSGI for sync apps only. C. Asynchronous Server Gateway Interface. D. HTTP/3 protocol only.

Select an answer to check.

Answer: Asynchronous Server Gateway Interface.

Here, Asynchronous Server Gateway Interface. is the right choice. Supports websockets and async. This matches the core idea being tested around what is the primary purpose of asgi. A quick elimination of partially true options helps confirm it.

Q7. Which statement about ASGI is most accurate?

A. A web server. B. HTTP/3 protocol only. C. WSGI for sync apps only. D. Asynchronous Server Gateway Interface.

Select an answer to check.

Answer: Asynchronous Server Gateway Interface.

In this case, Asynchronous Server Gateway Interface. is correct. Supports websockets and async. This matches the core idea being tested around which statement about asgi is most accurate. A quick elimination of partially true options helps confirm it.

Q8. How is ASGI best characterized?

A. A web server. B. WSGI for sync apps only. C. HTTP/3 protocol only. D. Asynchronous Server Gateway Interface.

Select an answer to check.

Answer: Asynchronous Server Gateway Interface.

The best option here is Asynchronous Server Gateway Interface.. Supports websockets and async. This matches the core idea being tested around how is asgi best characterized. A quick elimination of partially true options helps confirm it.

Q9. Which option best describes Uvicorn in Python?

A. A pure ORM. B. A logger. C. A reverse proxy. D. ASGI server commonly used with FastAPI.

Select an answer to check.

Answer: ASGI server commonly used with FastAPI.

For this question, ASGI server commonly used with FastAPI. is correct. Run with `uvicorn app:app`. This matches the core idea being tested around which option best describes uvicorn in python. A quick elimination of partially true options helps confirm it.

Q10. What is the primary purpose of Uvicorn?

A. A logger. B. ASGI server commonly used with FastAPI. C. A pure ORM. D. A reverse proxy.

Select an answer to check.

Answer: ASGI server commonly used with FastAPI.

ASGI server commonly used with FastAPI. is the correct answer here. Run with `uvicorn app:app`. This matches the core idea being tested around what is the primary purpose of uvicorn. A quick elimination of partially true options helps confirm it.

Q11. Which statement about Uvicorn is most accurate?

A. A reverse proxy. B. ASGI server commonly used with FastAPI. C. A pure ORM. D. A logger.

Select an answer to check.

Answer: ASGI server commonly used with FastAPI.

Here, ASGI server commonly used with FastAPI. is the right choice. Run with `uvicorn app:app`. That is exactly the concept behind which statement about uvicorn is most accurate in this context. A quick elimination of partially true options helps confirm it.

Q12. How is Uvicorn best characterized?

A. A logger. B. A reverse proxy. C. ASGI server commonly used with FastAPI. D. A pure ORM.

Select an answer to check.

Answer: ASGI server commonly used with FastAPI.

In this case, ASGI server commonly used with FastAPI. is correct. Run with `uvicorn app:app`. That is exactly the concept behind how is uvicorn best characterized in this context. A quick elimination of partially true options helps confirm it.

Q13. Which option best describes path operations in Python?

A. Templates only. B. Pure middleware mapping. C. Manual dispatch only. D. Routes via @app.get/post/put/delete decorators.

Select an answer to check.

Answer: Routes via @app.get/post/put/delete decorators.

The best option here is Routes via @app.get/post/put/delete decorators.. Define endpoints concisely. That is exactly the concept behind which option best describes path operations in python in this context. A quick elimination of partially true options helps confirm it.

Q14. What is the primary purpose of path operations?

A. Manual dispatch only. B. Pure middleware mapping. C. Routes via @app.get/post/put/delete decorators. D. Templates only.

Select an answer to check.

Answer: Routes via @app.get/post/put/delete decorators.

For this question, Routes via @app.get/post/put/delete decorators. is correct. Define endpoints concisely. That is exactly the concept behind what is the primary purpose of path operations in this context. A quick elimination of partially true options helps confirm it.

Q15. Which statement about path operations is most accurate?

A. Manual dispatch only. B. Pure middleware mapping. C. Templates only. D. Routes via @app.get/post/put/delete decorators.

Select an answer to check.

Answer: Routes via @app.get/post/put/delete decorators.

Routes via @app.get/post/put/delete decorators. is the correct answer here. Define endpoints concisely. That is exactly the concept behind which statement about path operations is most accurate in this context. A quick elimination of partially true options helps confirm it.

Q16. How is path operations best characterized?

A. Templates only. B. Manual dispatch only. C. Routes via @app.get/post/put/delete decorators. D. Pure middleware mapping.

Select an answer to check.

Answer: Routes via @app.get/post/put/delete decorators.

Here, Routes via @app.get/post/put/delete decorators. is the right choice. Define endpoints concisely. It fits the requirement in the prompt about how is path operations best characterized. A quick elimination of partially true options helps confirm it.

Q17. Which option best describes path parameters in Python?

A. Variables in the URL captured into args. B. Header fields only. C. Body fields only. D. Query params only.

Select an answer to check.

Answer: Variables in the URL captured into args.

In this case, Variables in the URL captured into args. is correct. Typed and validated. It fits the requirement in the prompt about which option best describes path parameters in python. A quick elimination of partially true options helps confirm it.

Q18. What is the primary purpose of path parameters?

A. Variables in the URL captured into args. B. Header fields only. C. Query params only. D. Body fields only.

Select an answer to check.

Answer: Variables in the URL captured into args.

The best option here is Variables in the URL captured into args.. Typed and validated. It fits the requirement in the prompt about what is the primary purpose of path parameters. A quick elimination of partially true options helps confirm it.

Q19. Which statement about path parameters is most accurate?

A. Header fields only. B. Query params only. C. Body fields only. D. Variables in the URL captured into args.

Select an answer to check.

Answer: Variables in the URL captured into args.

For this question, Variables in the URL captured into args. is correct. Typed and validated. It fits the requirement in the prompt about which statement about path parameters is most accurate. A quick elimination of partially true options helps confirm it.

Q20. How is path parameters best characterized?

A. Body fields only. B. Query params only. C. Header fields only. D. Variables in the URL captured into args.

Select an answer to check.

Answer: Variables in the URL captured into args.

Variables in the URL captured into args. is the correct answer here. Typed and validated. It fits the requirement in the prompt about how is path parameters best characterized. A quick elimination of partially true options helps confirm it.

Q21. Which option best describes query parameters in Python?

A. Header params. B. Path params. C. URL query string args bound to function params. D. Body params.

Select an answer to check.

Answer: URL query string args bound to function params.

Here, URL query string args bound to function params. is the right choice. Default values + types. This is the most accurate statement for which option best describes query parameters in python. A quick elimination of partially true options helps confirm it.

Q22. What is the primary purpose of query parameters?

A. Path params. B. Body params. C. Header params. D. URL query string args bound to function params.

Select an answer to check.

Answer: URL query string args bound to function params.

In this case, URL query string args bound to function params. is correct. Default values + types. This is the most accurate statement for what is the primary purpose of query parameters. A quick elimination of partially true options helps confirm it.

Q23. Which statement about query parameters is most accurate?

A. Body params. B. Header params. C. URL query string args bound to function params. D. Path params.

Select an answer to check.

Answer: URL query string args bound to function params.

The best option here is URL query string args bound to function params.. Default values + types. This is the most accurate statement for which statement about query parameters is most accurate. A quick elimination of partially true options helps confirm it.

Q24. How is query parameters best characterized?

A. Path params. B. Body params. C. Header params. D. URL query string args bound to function params.

Select an answer to check.

Answer: URL query string args bound to function params.

For this question, URL query string args bound to function params. is correct. Default values + types. This is the most accurate statement for how is query parameters best characterized. A quick elimination of partially true options helps confirm it.

Q25. Which option best describes request body in Python?

A. Always headers. B. JSON request body bound via Pydantic models. C. Pure form data only. D. Always query params.

Select an answer to check.

Answer: JSON request body bound via Pydantic models.

JSON request body bound via Pydantic models. is the correct answer here. Auto-validated. This is the most accurate statement for which option best describes request body in python. A quick elimination of partially true options helps confirm it.

Q26. What is the primary purpose of request body?

A. JSON request body bound via Pydantic models. B. Always headers. C. Always query params. D. Pure form data only.

Select an answer to check.

Answer: JSON request body bound via Pydantic models.

Here, JSON request body bound via Pydantic models. is the right choice. Auto-validated. It aligns directly with what the question asks about what is the primary purpose of request body. The other options are either incomplete or contextually incorrect.

Q27. Which statement about request body is most accurate?

A. Always query params. B. Always headers. C. Pure form data only. D. JSON request body bound via Pydantic models.

Select an answer to check.

Answer: JSON request body bound via Pydantic models.

In this case, JSON request body bound via Pydantic models. is correct. Auto-validated. It aligns directly with what the question asks about which statement about request body is most accurate. The other options are either incomplete or contextually incorrect.

Q28. How is request body best characterized?

A. Always query params. B. Always headers. C. Pure form data only. D. JSON request body bound via Pydantic models.

Select an answer to check.

Answer: JSON request body bound via Pydantic models.

The best option here is JSON request body bound via Pydantic models.. Auto-validated. It aligns directly with what the question asks about how is request body best characterized. The other options are either incomplete or contextually incorrect.

Q29. Which option best describes Pydantic models in Python?

A. Plain dicts. B. Data classes with validation/serialization. C. SQL models only. D. Plain dataclasses only.

Select an answer to check.

Answer: Data classes with validation/serialization.

For this question, Data classes with validation/serialization. is correct. V1 vs v2 differences exist. It aligns directly with what the question asks about which option best describes pydantic models in python. The other options are either incomplete or contextually incorrect.

Q30. What is the primary purpose of Pydantic models?

A. Plain dataclasses only. B. Data classes with validation/serialization. C. Plain dicts. D. SQL models only.

Select an answer to check.

Answer: Data classes with validation/serialization.

Data classes with validation/serialization. is the correct answer here. V1 vs v2 differences exist. It aligns directly with what the question asks about what is the primary purpose of pydantic models. The other options are either incomplete or contextually incorrect.

Q31. Which statement about Pydantic models is most accurate?

A. Plain dicts. B. SQL models only. C. Plain dataclasses only. D. Data classes with validation/serialization.

Select an answer to check.

Answer: Data classes with validation/serialization.

Here, Data classes with validation/serialization. is the right choice. V1 vs v2 differences exist. This matches the core idea being tested around which statement about pydantic models is most accurate. The other options are either incomplete or contextually incorrect.

Q32. How is Pydantic models best characterized?

A. Plain dataclasses only. B. Plain dicts. C. Data classes with validation/serialization. D. SQL models only.

Select an answer to check.

Answer: Data classes with validation/serialization.

In this case, Data classes with validation/serialization. is correct. V1 vs v2 differences exist. This matches the core idea being tested around how is pydantic models best characterized. The other options are either incomplete or contextually incorrect.

Q33. Which option best describes OpenAPI / Swagger UI in Python?

A. Auto-generated API docs. B. Manual docs only. C. Pure HTML pages. D. Static markdown.

Select an answer to check.

Answer: Auto-generated API docs.

The best option here is Auto-generated API docs.. Interactive at /docs. This matches the core idea being tested around which option best describes openapi / swagger ui. The other options are either incomplete or contextually incorrect.

Q34. What is the primary purpose of OpenAPI / Swagger UI?

A. Static markdown. B. Manual docs only. C. Auto-generated API docs. D. Pure HTML pages.

Select an answer to check.

Answer: Auto-generated API docs.

For this question, Auto-generated API docs. is correct. Interactive at /docs. This matches the core idea being tested around what is the primary purpose of openapi /. The other options are either incomplete or contextually incorrect.

Q35. Which statement about OpenAPI / Swagger UI is most accurate?

A. Manual docs only. B. Auto-generated API docs. C. Pure HTML pages. D. Static markdown.

Select an answer to check.

Answer: Auto-generated API docs.

Auto-generated API docs. is the correct answer here. Interactive at /docs. This matches the core idea being tested around which statement about openapi / swagger ui is. The other options are either incomplete or contextually incorrect.

Q36. How is OpenAPI / Swagger UI best characterized?

A. Manual docs only. B. Static markdown. C. Auto-generated API docs. D. Pure HTML pages.

Select an answer to check.

Answer: Auto-generated API docs.

Here, Auto-generated API docs. is the right choice. Interactive at /docs. That is exactly the concept behind how is openapi / swagger ui best characterized in this context. The other options are either incomplete or contextually incorrect.

Q37. Which option best describes dependency injection in Python?

A. Depends() resolves dependencies for endpoints. B. Service Locator only. C. Pure singletons. D. Manual instantiation only.

Select an answer to check.

Answer: Depends() resolves dependencies for endpoints.

In this case, Depends() resolves dependencies for endpoints. is correct. Encourages testability. That is exactly the concept behind which option best describes dependency injection in python in this context. The other options are either incomplete or contextually incorrect.

Q38. What is the primary purpose of dependency injection?

A. Pure singletons. B. Manual instantiation only. C. Depends() resolves dependencies for endpoints. D. Service Locator only.

Select an answer to check.

Answer: Depends() resolves dependencies for endpoints.

The best option here is Depends() resolves dependencies for endpoints.. Encourages testability. That is exactly the concept behind what is the primary purpose of dependency injection in this context. The other options are either incomplete or contextually incorrect.

Q39. Which statement about dependency injection is most accurate?

A. Pure singletons. B. Depends() resolves dependencies for endpoints. C. Service Locator only. D. Manual instantiation only.

Select an answer to check.

Answer: Depends() resolves dependencies for endpoints.

For this question, Depends() resolves dependencies for endpoints. is correct. Encourages testability. That is exactly the concept behind which statement about dependency injection is most accurate in this context. The other options are either incomplete or contextually incorrect.

Q40. How is dependency injection best characterized?

A. Manual instantiation only. B. Service Locator only. C. Pure singletons. D. Depends() resolves dependencies for endpoints.

Select an answer to check.

Answer: Depends() resolves dependencies for endpoints.

Depends() resolves dependencies for endpoints. is the correct answer here. Encourages testability. That is exactly the concept behind how is dependency injection best characterized in this context. The other options are either incomplete or contextually incorrect.

Q41. Which option best describes BackgroundTasks in Python?

A. Pure processes. B. Run tasks after responding to user. C. Pure async loops. D. Pure threads.

Select an answer to check.

Answer: Run tasks after responding to user.

Here, Run tasks after responding to user. is the right choice. For lightweight post-response work. It fits the requirement in the prompt about which option best describes backgroundtasks in python. The other options are either incomplete or contextually incorrect.

Q42. What is the primary purpose of BackgroundTasks?

A. Pure processes. B. Pure threads. C. Run tasks after responding to user. D. Pure async loops.

Select an answer to check.

Answer: Run tasks after responding to user.

In this case, Run tasks after responding to user. is correct. For lightweight post-response work. It fits the requirement in the prompt about what is the primary purpose of backgroundtasks. The other options are either incomplete or contextually incorrect.

Q43. Which statement about BackgroundTasks is most accurate?

A. Pure threads. B. Pure async loops. C. Run tasks after responding to user. D. Pure processes.

Select an answer to check.

Answer: Run tasks after responding to user.

The best option here is Run tasks after responding to user.. For lightweight post-response work. It fits the requirement in the prompt about which statement about backgroundtasks is most accurate. The other options are either incomplete or contextually incorrect.

Q44. How is BackgroundTasks best characterized?

A. Pure threads. B. Pure processes. C. Run tasks after responding to user. D. Pure async loops.

Select an answer to check.

Answer: Run tasks after responding to user.

For this question, Run tasks after responding to user. is correct. For lightweight post-response work. It fits the requirement in the prompt about how is backgroundtasks best characterized. The other options are either incomplete or contextually incorrect.

Q45. Which option best describes async endpoints in Python?

A. Endpoints defined with async def. B. Pure threads. C. Pure processes. D. Sync only.

Select an answer to check.

Answer: Endpoints defined with async def.

Endpoints defined with async def. is the correct answer here. Use for IO-bound endpoints. It fits the requirement in the prompt about which option best describes async endpoints in python. The other options are either incomplete or contextually incorrect.

Q46. What is the primary purpose of async endpoints?

A. Endpoints defined with async def. B. Pure processes. C. Pure threads. D. Sync only.

Select an answer to check.

Answer: Endpoints defined with async def.

Here, Endpoints defined with async def. is the right choice. Use for IO-bound endpoints. This is the most accurate statement for what is the primary purpose of async endpoints. The other options are either incomplete or contextually incorrect.

Q47. Which statement about async endpoints is most accurate?

A. Sync only. B. Endpoints defined with async def. C. Pure processes. D. Pure threads.

Select an answer to check.

Answer: Endpoints defined with async def.

In this case, Endpoints defined with async def. is correct. Use for IO-bound endpoints. This is the most accurate statement for which statement about async endpoints is most accurate. The other options are either incomplete or contextually incorrect.

Q48. How is async endpoints best characterized?

A. Pure processes. B. Endpoints defined with async def. C. Pure threads. D. Sync only.

Select an answer to check.

Answer: Endpoints defined with async def.

The best option here is Endpoints defined with async def.. Use for IO-bound endpoints. This is the most accurate statement for how is async endpoints best characterized. The other options are either incomplete or contextually incorrect.

Q49. Which option best describes response models in Python?

A. SQL rows. B. Pure dicts. C. No schemas allowed. D. Schemas controlling response shape.

Select an answer to check.

Answer: Schemas controlling response shape.

For this question, Schemas controlling response shape. is correct. Hide internal fields. This is the most accurate statement for which option best describes response models in python. The other options are either incomplete or contextually incorrect.

Q50. What is the primary purpose of response models?

A. Schemas controlling response shape. B. Pure dicts. C. No schemas allowed. D. SQL rows.

Select an answer to check.

Answer: Schemas controlling response shape.

Schemas controlling response shape. is the correct answer here. Hide internal fields. This is the most accurate statement for what is the primary purpose of response models. The other options are either incomplete or contextually incorrect.