Final answer:
The examples of using dry heat to sterilize materials are 3. incineration and a hot air oven, which apply high temperatures to destroy microorganisms.
Step-by-step explanation:
An example of using dry heat to sterilize materials is the use of a hot air oven. This method involves applying dry heat for extended periods (at least 2 hours) at temperatures up to 170 °C.
3. Incineration is another dry-heat sterilization technique, where very high temperatures are used to destroy all microorganisms. In contrast, methods like tyndallization, autoclaving, and pasteurization employ moist heat and are not examples of dry-heat sterilization. Incineration and hot air ovens are therefore the correct answers for dry-heat sterilization methods among the options provided.