Modern Application Development II · End Term · 13 Sept 2026 · May 2026 term · Set 1

Question 9: Pratham builds a Flask route that generates a PDF report …

Question 9

+3 marksOne or more correct options

Pratham builds a Flask route that generates a PDF report and sends it to the user via email, all inside the route handler without using Celery. A tester notices that the browser takes about 12 seconds to respond, and during that time other users are unable to use the app normally. Which of the following correctly explain this behaviour and what Celery would change?

Select all that apply.

A
Flask handles one request at a time per worker, so the long-running task blocks the entire process until it finishes.
B
Other users' requests are queued and only served after the heavy task completes, making the app feel unresponsive.
C
D
With Celery, Flask immediately returns a response to the user while the report generation and email sending happen inside a separate Celery worker process in the background.

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Correct answers

A
Flask handles one request at a time per worker, so the long-running task blocks the entire process until it finishes.
B
Other users' requests are queued and only served after the heavy task completes, making the app feel unresponsive.
D
With Celery, Flask immediately returns a response to the user while the report generation and email sending happen inside a separate Celery worker process in the background.

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Question 9 of 30 in the IIT Madras BS Modern Application Development II (MAD 2) End Term paper sat on 13 Sept 2026, in the May 2026 term (Modern Application Development Ii 13 Sep 26 (Session 2)). It carries 3 marks.

Question 9: Pratham builds a Flask route that generates a PDF report …

Question 9

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