Question

give an example of a :

1) a physical quantity which has unit but no dimension

2) a physical quantity which has neither unit nor dimension

3) a constant which has a unit

4) a constant which has no unit

Answer 1

(1) Angle in a plane is measured in radian ,though it has no dimensions
(2)Strain has neither units nor dimensions.
(3) Universal Gravitational constant (G) has a constant value : 6.67×10^-11 Nm²kg^-2
(4) Reynolds number is a constant which has no unit.