Correct option is (c) increased by ρgh=2
The explanation is: Base pressure when the beaker is filled with a liquid of density ρ up to a height h = ρgh
Base pressure when half the liquid is replaced by equal volume of another liquid of twice the density
= ρg ^h⁄2 + 2ρg ^h⁄2 = ^3⁄2 ρgh
Thus the change in base pressure is = ρgh / 2. Since, P2 > P1, there will be an increase in pressure.