Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

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Q. Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

(A) 12
(B) 36
(C) 54
(D) 68

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✅ Correct Answer: (B) 36

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