Mark the correct alternative in each of the following:

Vectors and are inclined at angle θ = 120°. If , then is equal to

Mark the correct alternative in each of the following:

The unit vector perpendicular to the plane passing through points and is

Mark the correct alternative in each of the following:

If represent the diagonals of a rhombus, then

Mark the correct alternative in each of the following:

If and , then a unit vector normal to the vectors and is

Mark the correct alternative in each of the following:

A unit vector perpendicular to both and is