Q. 20

# Water is flowing through a long horizontal tube. Let PA and PB be the pressures at two points A and B of the tube.A. PA must be equal to PBB. PA must be greater than PBC. PA must be smaller than PBD. PA = PB only if the cross-sectional area at A and B are equal.

The pressure at the two points would be equal only if the velocities of the water at these points are equal. This is possible only if the cross-sectional areas are equal at the points. If this is not true, the pressure will vary with the velocities of the water at the points.

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