This video lecture from Vectors (F.Sc. second year Mathematics) covers: Question 5-6 of exercise 7.3. In these questions we find a vector "v", where we are given that its dot product with all three axes is zero. By using vector method we also show that the given vectors are perpendicular to each other. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.