Question

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 1

(a) Angle or solid angle. 

(b) Relative density, etc. 

(c) Planck’s constant, universal gravitational constant, etc. 

(d) Reynold’s number.