Engineering Materials
Closed packed hexagonal space lattice is found in

Gamma-iron, aluminium, copper, lead, silver and nickel
None of these
Zinc, magnesium, cobalt, cadmium, antimony and bismuth
Alpha-iron, tungsten, chromium and molybdenum

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Engineering Materials
Smelting is the process of

All of these
Reducing the ore with carbon in the presence of a flux
Removing the impurities like clay, sand etc. from the iron ore by washing with water
Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns

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Engineering Materials
Thermoplastic materials are those materials which

Are formed into shape under heat and pressure and results in a permanently hard product
Do not become hard with the application of heat and pressure and no chemical change occurs
Are flexible and can withstand considerable wear under suitable conditions
Are used as a friction lining for clutches and brakes

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