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Three of the following are SI base units. Which is the odd one out?

  • A.the second
  • B.the kelvin
  • C.the newton
  • D.the kilogram

Answer: C

The newton is a derived unit built from mass, length and time. Knowing which units are base and which derived is what makes a dimensional reduction possible in the first place. Seven base units cover the whole of the SI system.

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