Preset trays hold all instruments need in a particular procedure. It is put together in a tub and trays are easily exchanged for other instruments. It is designed to increase efficiency in operations, minimize waiting time and space is reconfigured.
The pressure exerted by the sharp knife edge is more than that exerted by the blunt one because the area on which force is exerted with a sharp knife is very small.So blunt knife cannot cut the vegetables properly.
