Q1: In flow, the liquid particles may possess

ANS:D - all the above.

1. Potential energy: Liquid particles may possess potential energy due to their position in a gravitational field. This potential energy is associated with the elevation of the fluid particles above a reference plane.
2. Kinetic energy: Liquid particles in motion possess kinetic energy due to their velocity. This energy is related to the motion of the particles and is directly proportional to their mass and the square of their velocity.
3. Pressure energy: Liquid particles in a fluid system possess pressure energy due to the pressure exerted on them by the surrounding fluid. This energy is associated with the internal pressure of the fluid and its ability to do work on its surroundings.