Pressure in a perfect fluid depends only on the depth of the fluid. ( , where is the density of the fluid.) Thus the answer is e).

The volume of water displaced by the ice cube is the same as the volume of ice submerged. BUT ice is less dense than water. So the melting ice expands. Thus the water level will go up (very slightly).

Sound intensity is an "areal" law, that is to say intensity depends on the amount of area the wave covers at a certain distance from the source. (I = P/A, where I is intensity, P is the power of the source, and A is the area.) Sound waves are spherical in nature so the area goes as (r being the distance from the source.) So as we are halving r the intensity increases by

, so the answer is b).

-Dan