1. Which of the following is used in welding broken pieces of iron rails and machine parts? A.Aluminium sulphate B.Solder C.Aluminium powder D.None of the above
Answer: Option C Solution: Aluminum powder is a highly flammable powder created by grinding aluminum into fine grains of material. In times past, this flammable metal powder was used in photography to create bright flashes during a photographic session. Today, aluminum powder is one of the tools utilized in various applications of pyrotechnics, including the creation of fireworks displays. Used primarily as an inlay compound, the aluminum powder can easily be used to set cut pieces of wood into position and also fill in any tiny gaps that may be present at the joints. Since only a minute amount of powder is necessary for functions of this type, the chances of ignition are somewhat limited.
