Question

Which of the following is/are dimensionless ?
a) Boltzman’s constant b) Planck’s constant c) Poisson’s ratio d) Relative constant

• A. a and b
• B. c and b
• C. c and d
• D. d and a

Answer 1

Answer: (C)

c and d

Poisson's ratio is ratio of young modulus, hence dimensionless.

Relative constant is also a constant.

Boltzman's constant $=M^1{L}^2{T}^{-2}{K}^{-1}$

Plancks constant $=M{L}^2{T}^{-1}$

Hence, option C is correct.