How the magnitude of vector quantity is represented ?

Pick out the two scalar quantities in the following list :

force, angular momentum, work, current, linear momentum, electric field, average velocity, magnetic moment, relative velocity.

If $\overrightarrow A $ is $(3,\, 4)$ unit, then show that the value of its unit vector is $1$.

If $\vec P = \vec Q$ then which of the following is NOT correct

Explain null vector. Explain the physical significance of null vector.