Orthonormal set as orthogonal plus unit length — IITM BS previous year questions

Orthonormal set as orthogonal plus unit length is part of Orthonormal Basis, 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.