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Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is
Answer & Solution
Correct Answer:
Option
D
Invar is an alloy of iron and nickel with a negligible coefficient of expansion,.
and it is used in the making of clocks and scientific instruments like surveying tapes
and it is used in the making of clocks and scientific instruments like surveying tapes
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