Orange juice with pulp is a heterogeneous mixture. The pulp is not uniformly distributed throughout the juice, often settling at the bottom of the jug, resulting in regions with distinctly different properties.
Filtered orange juice is an example of a homogeneous mixture. The pulp has been removed entirely and the ingredients that make up the juice are evenly distributed throughout the mixture. This is distinctly different from the heterogeneity of the orange juice with the pulp still in it, which is typically thinner towards the top and thicker with pieces of pulp towards the bottom, unless it has been mixed or shaken for more even distribution.