All of the following are examples of physical hazards except:

Physical hazards in food safety refer to any objects that are not food but can contaminate food and potentially cause harm to consumers. These can include items such as metal, glass, stones, or any similar foreign materials.

In this context, the correct choice highlighting what does not represent a physical hazard is pesticide on the food prep counter. Pesticides are chemical substances used to kill pests and control pests on crops. While they can pose a significant health risk when they contaminate food, particularly from a chemical perspective, they do not fit into the definition of a physical hazard, as they do not involve a foreign object that can cause injury or choking.

Metal shavings, gemstones, and broken glass are all considered physical hazards. Metal shavings can come from kitchen utensils or equipment, gemstones can fall off jewelry, and broken glass can result from shattered dishes. All these items can lead to physical harm if ingested or if they cause cuts or other injuries, which is why they are classified as physical hazards.