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Q)

The one that is used automobiles and aeroplanes is.

$ (a)\;\text{cast iron} \\(b)\;\text{aluminium.} \\(c)\;\text{wrought iron} \\ (d)\;\text{nickel steel} $

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A)
Nickel steel is used for making cables, automobiles and aeroplane parts; pendulum, for cutting tools rushing machines; stainless steel for cycles, automobiles, utensipens.
Hence d is the correct answer.
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