Q 1 :    

The cylindrical tube of a spray pump has radius $R$, one end of which has $n$ fine holes, each of radius $r$. If the speed of the liquid in the tube is $V$, the speed of the ejection of the liquid through the holes is                 [2015]
 

• $\frac{V{R}^2}{n^3{r}^2}$

   

• $\frac{V^{2}R}{nr}$

   

• $\frac{V{R}^2}{n^2{r}^2}$

   

• $\frac{V{R}^2}{n{r}^2}$