Orthogonal complement of a subspace — IITM BS previous year questions

Orthogonal complement of a subspace is part of Orthogonality and Linear Independence, Week 8 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.