answers for all 3

Which of the following describes a ceramic solid? Select one: O Non-metallic, inorganic and crystalline solid Metallic, inorganic and crystalline solid O Non-metallic inorganic and amorphous solid O Non-metallic, organic and amorphous solid Metallic, inorganic and amorphous solid Ageing of aluminum alloy leads to Select one: O appearance of the oxide scales O loss of hardness with time o increase in ductility with time O loss of toughness with time O increase in strength with time In which of the following cases is consideration of creep most important? Select one: O Cycle chains O Piston of an engine O Gas turbine blades O Cast Iron pipes O Flywheel of steam engine