An invar tape is made of an alloy of :

Brass and steel

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Brass and nickel

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Copper and steel

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Nickel and steel

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Solution

The correct option is D Nickel and steel
Invar tape is made up of an alloy of nickel (36%) and steel (64%). It is less affected by temperature changes when compared to the other tapes due to very low coefficient of thermal expansion. It is highly precise but requires much attention in handling as it is soft and deforms easily.

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