Which of the following is not used as SI prefixes:

Deca

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Kilo

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Femto

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Mica

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Solution

The correct option is C Mica
When 'Deca' is attached as a prefix to a unit, it means it is 10 times of that unit. Kilo means thousand times of a unit. Femto means of $10^{- 15}$ of a unit. Mica is not a prefix but a name of a specific material.

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