Cycle detection - DFS back edges indicate a cycle — IITM BS previous year questions

Cycle detection - DFS back edges indicate a cycle is part of Applications of BFS and DFS, Week 10 in Mathematics 1. Prasnya files every IIT Madras BS previous year question from this subtopic here, each one with a worked explanation. Take the whole set as a timed mock and you get accuracy, pacing and per-question analysis back.