Pressure Distribution in a Liquid subjected to constant horizontal acceleration

Q. If a water tank, partially filled with water is being carried on a truck, moving with a constant horizontal acceleration, the level of liquid will

1. Rise and fall alternately on the front side of the tank
2. Fall on the rear side of the tank
3. Remain the same on both sides of the tank
4. Rise on the rear side and fall on the front side of the tank

Q. A tank is 1.50 m square and 1 m height, it is completely filled with water. How high must its sides be if no water is to be spilled when acceleration is 4 $m/s^2$ parallel to a pair of sides ?

1. 1.306 m
2. 1.508 m
3. 1.866 m
4. 1.426 m