Give an example of (a) a physical quantity which has a unit but no dimensions (b) a physical quantity which has neither unit nor dimensions (c) a constant which has a unit (d) a constant which has no unit.

Give an example of (a) a physical quantity which has a unit but no di

1.	Give an example of (a) a physical quantity which has a unit but no dimensions (b) a physical quantity which has neither unit nor dimensions (c) a constant which has a unit (d) a constant which has no unit.
Answer» Solution :PLANE angle `theta=(l)/(r)` RADIAN its unit is radian but `[theta]=M^(0)L^(0)T^(0)` (b) Strain `=(Deltal)/(l)=("Change in length")/("origianl length")` It has neither unit nor dimensions (C) GRAVITATIONAL constant. `[G]=6.67xx10^(-11)(N*m^(2))/(kg^(2))` (d) Reynold.s number is a constant which has no unit.