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Q)

Which of the following alloys does not contain aluminium ?

$\begin {array} {1 1} (A)\;Duralumin & \quad (B)\;Magnalium \\ (C)\;Alnico & \quad (D)\;Constantan \end {array}$

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A)
Answer : Constantan
Constantan is an alloy of Cu ( 60 % ) and Ni (40 %).
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