Are these statements about the dimensionless quantities true?
Statement 1: A quantity which does not have any physical units.
Statement 2: Relative density and Reynolds number are examples of the dimensionless quantities.
a) True, False
b) True, True
c) False, True
d) False, False

Answer: b
Explanation: A quantity which does not have any physical units is called as dimensionless quantities. The relative density is the dimensionless quantity which is defined as the ratio of the density of a component to density of the given reference component. The Reynold number (R) is also a dimensionless quantity that is used to determine whether the fluid is following laminar flow (R< 2300) or turbulent flow(R>4000).