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Which one of the following statements is incorrect?

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Which one of the following statements is incorrect?
A. Direct and indirect methods are used for the measurement of physical quantities.
B. Scientific notation and the prefixes are used to simplify numberical computation.
C. A dimensionally correct equation need not be a correct equation.
D. The SI units is based on six base units.
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Correct Answer - D
The SI units is based on seven base units. These are metre, kilogram, second, ampere, kelvin, mole and candela.
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