Topics of Interest Units And Measurement
Raj Kumar Parashari 22 Sep, 2019 Views: 360
Ans.1. (i) The principle of homogeneity of dimensions is based on the fact that only the physical quantities of the same kind can be added or subtracted.
(ii) For a dimensionally correct formula, the dimensional formula of left hand side equal to dimensional formula of right hand side.
Ans.2. No, a quantity has same dimensions in all system of units.
Ans.3. Yes. For example, a plane angle is dimensionless but has unit 'radian' for its measurement.
Ans. 4. Yes, relative density and strain are the physical quantities that has neither units nor dimensional formula.