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Elinvar an alloy used in precision instruments hair springs for watches...

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Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element

Answer & Solution
Correct Answer: Option D
Elinvar is a nickel-iron alloy notable for having a modulus of elasticity which does not change much with temperature changes.
Elinvar originally consisted of 52% iron, 36% nickel, and 12% chromium.
It is almost non-magnetic, and corrosion resistant.
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