Directional derivative in terms of gradient dot unit direction vector — IITM BS previous year questions

Directional derivative in terms of gradient dot unit direction vector is part of Continuity and Gradient Formula, Week 9 in Mathematics 2. 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.