$($iv$)$ In a similitude with gravity force, where equality of Froude number exists, the acceleration ratio $a_r$ becomes

$($a$)L_r^2$

$($b$)L_r^{\frac{5}{2}}$

$($c$)1$

$($d$)L_r^{\frac{3}{2}}$

where $L_r$ is the geometrical scale factor.

$[$Ans$.($c$)]$