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Match the dimensionless numbers in $Group–I$ with the ratios in  $Group–2$.

&\text{Group-1} & \text{Group-2} \\ 
&\text{P. Biot number} & \text{ I. $\frac{buoyancy force}{viscous force}$} \\ 
&\text{ Q. Schmidt number} & \text{II. $\frac{internal thermal resistance of a solid}{boundary layer thermal resistance}$} \\ 
&\text{R. Grashof number} & \text{III. $\frac{momentum diffusivity}{mass  diffusivity}$} \\ \\ \end{array}$

  1. $P-II$, $Q-I$, $R-III$
  2. $P-I$, $Q-III$, $R-II$
  3. $P-III$, $Q-I$, $R-II$
  4. $P-II$, $Q-III$, $R-I$


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