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Question

Which of the following is a ferrous alloy?

A
Solder
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B
Invar
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C
Bronze
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D
Magnalium
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Solution

The correct option is A Invar

1) Invar, generically known as FeNi36(64FeNi in the US), is a nickel–iron alloy notable for its uniquely low coefficient of thermal expansion.

2) The name Invar comes from the word invariable, referring to its relative lack of expansion or contraction with temperature changes.


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