What is a null vectors ?

What is a null vector ? What is its use ?

What is a null vector? Define a unit vector.

What is null vector ?

Which one of the following is a null vector ?

How many directions a null vector has ?

Cross product of two paralle or antiparallel vectors is a null vector. Is this statement true or false?

Cross product of two paralle or antiparallel vectors is a null vector. Is this statement true or false?

Statement-I : If the initial and final positions coincide, the displacement is a null vector. Statement-II : A physical quantity can not be called a vector, if its magnitude is zero.