If and neither nor is the zero vector

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

\vec{p}\times\vec{q}=\vec{0}

and neither

\vec{p}

nor

\vec{q}

is the zero vector, the angle between

\vec{p}

and

\vec{q}

is (a)

90^{\circ}

(b)

0^{\circ}\text{ or }180^{\circ}

(c)

180^{\circ}

(d)

0^{\circ}