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Which of the following quantities has not been expressed in proper units?

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Surface tension = $N m^{- 1}$

$E n e r g y = k g m s^{- 1}$

$\Pr e s s u r e = N m^{- 2}$

$\frac{S t r e s s}{S t r a i n} = N m^{- 2}$

answer is C.

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Detailed Solution

Energy = Force × distance

$∴ I t s u n i t w i l l b e k g m^{2} s^{- 2}$

Energy does not have the units of $k g m s^{- 1} .$

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