Mark the correct alternative in each of the following:

If the vectors are perpendicular, then λ is equal to

Mark the correct alternative in each of the following:

The values of x for which the angle between is obtuse and the angle between and the z-axis is acute and less than π/6 are

Mark the correct alternative in each of the following:

If are any three mutually perpendicular vectors of equal magnitude a, then is equal to

Mark the correct alternative in each of the following:

The projection of the vector along the vector is

Mark the correct alternative in each of the following:

The vectors are perpendicular, if