Why is the pendulum of a clock made of Invar (alloy of Iron and Nickel ) ?
A
Invar has low melting point
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B
Invar is non-reactive towards components of air
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C
Invar has negligible coefficient of expansion
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D
Invar is very delicate
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Solution
The correct option is C Invar has negligible coefficient of expansion The pendulum clock is made up of invar because invar's coefficient of thermal expansion is small. So, the length of the pendulum remains unaffected during changes in temperature.