Which of the following is an example of physical contamination?

Physical contamination occurs when objects or foreign materials unintentionally find their way into food, posing a threat to consumer safety. Examples of physical contaminants include items such as glass and metal particles, hair, jewelry, or plastic. These types of contaminants can cause injury if ingested and are referred to as physical contaminants because they are tangible, solid objects that can be physically separated from the food.

In contrast, pesticides and infected workers represent biological and chemical hazards, respectively. Pesticides are substances used to kill pests and can lead to chemical contamination of food. Infected workers may carry pathogens that can lead to foodborne illnesses, which is a concern related to biological contamination. Cross-contamination involves the transfer of harmful microorganisms from one food item to another, usually between raw and cooked foods, and is a major concern for food safety but does not involve physical objects. Therefore, the correct option for an example of physical contamination is indeed the presence of glass and metal particles.