Which of the following is universally employed as the low expansion metal in the

Question

Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals)?

Options:

A . Invar

B . Constantan

C . Chromel

D . Alumel

Answer: Option A

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