$(1)$ Out of the two measurements $50.14 \,cm$ and $0.00025$ ampere, the first one has greater accuracy
$(2)$ If one travels $478\, km$ by rail and $397\, m$. by road, the total distance travelled is $478\, km.$
Statement $(I)$ : Dimensions of specific heat is $\left[\mathrm{L}^2 \mathrm{~T}^{-2} \mathrm{~K}^{-1}\right]$
Statement $(II)$ : Dimensions of gas constant is $\left[\mathrm{ML}^2 \mathrm{~T}^{-1} \mathrm{~K}^{-1}\right]$