Question

The only mechanical quantity which has negative dimension of mass is

• A. angular momentum
• B. torque
• C. coefficient of thermal conductivity
• D. gravitational constant

Answer 1

Answer: (D)

gravitational constant

Answer 2

Dimensional formula of angular momentum
$(L)=\left[M L^{2} T^{-1}\right]$
Torque $(\tau)=\left[M L^{2} T^{-2}\right]$
Coefficient of thermal conductivity
$(k)=\left[M L T^{-3} K^{-1}\right]$
Gravitational constant
$(G)=\left[M^{-1} L^{3} T^{-2}\right]$
Thus. gravitational constant has negative dimension of mass.