A suspended particle falls through a height H cm in water in t minutes. If the viscosity of water is η and specific gravity of the particle is G, the diameter of the particle is (where M is a constant factor)

ANS:C - 10⁵M

If we take standard conditions...like g is..981 cm/ml,
Pw is 1 gm/ml viscosity is 10.09*10^-3 poise.
T 20° C,
G is 2.67,
then we get V=90.2D^2.