Question

In the following list, the only pair which have different dimensions, is

• A. (a) Linear momentum and moment of a force
• A. (b) Planck's constant and angular momentum
• A. (c) Pressure and modulus of elasticity
• A. (d) Torque and potential energy

Answer 1

(a)

Sol. Linear momentum = Mass $\times$ Velocity = $\lbrack MLT^{- 1}\rbrack$

Moment of a force

= Force $\times$ Distance = $\lbrack ML^{2}T^{- 2}\rbrack$