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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) ? | |
A. | Invar [Correct Answer] |
B. | Constantan [Wrong Answer] |
C. | Chromel [Wrong Answer] |
D. | Alumel [Wrong Answer] |