$N m^{- 1}$ is the SI unit of:

viscosity

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spring constant

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surface tension

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both B and C

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Solution

The correct option is D both B and C
Spring constant, $k = \frac{F}{x}$ , unit for force is $N m^{- 1}$
Surface tension $= \frac{F}{L}$
Therefore, both B and C have the unit $N m^{- 1}$ .

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