The ore from which aluminium is extracted economically is
A) kaolin
B) kryolite
C) corundum
D) bauxite
Correct Answer:
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Q16: By calcining and smelting iron ores, a
Q17: The colour of cast iron is
A)grey
B)white
C)both grey
Q18: The compressive and tensile strength of cast
Q19: For making spiral staircases, ideal material is
A)pig
Q20: Purest form of iron is
A)pig iron
B)cast iron
C)wrought
Q21: Carbon content in wrought iron is
A)0.15%
B)0.25 to
Q22: The ratio of tensile strength to compressive
Q23: Ribs are made on steel wires to
Q24: The property of metal enabling it to
Q25: Non-ferrous Materials
A)Market form of copper is/are
B)ingots
C)sheets
D)tubes
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